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moved canbus4bta to STM32F3

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Edward Emelianov 2023-12-08 16:45:10 +03:00
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BIN
F3:F303/CANbus4BTA/BTA_CAN.bin Executable file
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F3:F303/CANbus4BTA/Makefile Normal file
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BINARY := BTA_CAN
# MCU code
MCU := F303xb
# change this linking script depending on particular MCU model,
LDSCRIPT := stm32f303xB.ld
DEFINES := -DUSB1_16
include ../makefile.f3
include ../../makefile.stm32

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F3:F303/CANbus4BTA/Readme.md Normal file
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BTA CANbus node controller
====================================
# Pinout
PP - push-pull, OD - open drain, I - floating input, A - analog input, AFn - alternate function number n.
1 - active high, 0 - active low.
### Sorted by pin number
|**Pin #**|**Pin name **| **function**| **settings**|**comment ** |
|---------|-------------|-------------|-------------|------------------|
| 1 | VBAT | 3v3 | | |
| 2 | PC13 | buzzer | PP1 | |
| 3 | PC14 | relay | PP1 | |
| 4 | PC15 | usb pullup | PP1 | |
| 5 | PF0 | OSCIN | | |
| 6 | PF1 | OSCOUT | | |
| 7 | NRST | reset | | |
| 8 | VSSA | gnd | | |
| 9 | VDDA | 3v3 | | |
| 10 | PA0 | AIN0 | A | |
| 11 | PA1 | AIN1 | A | |
| 12 | PA2 | ANI2 | A | |
| 13 | PA3 | AIN3 | A | |
| 14 | PA4 | DIN | I | mul0/1 input |
| 15 | PA5 | DEN0 | PP0 | enable mul0 |
| 16 | PA6 | DEN1 | PP0 | enable mul1 |
| 17 | PA7 | PWM | AF1 | TIM17CH1 PWM |
| 18 | PB0 | ADDR0 | PP | MUL address |
| 19 | PB1 | ADDR1 | PP | selection |
| 20 | PB2 | ADDR2 | PP | |
| 21 | PB10 | PB10 | gpio | reserved gpio |
| 22 | PB11 | PB11 | gpio | reserved gpio |
| 23 | VSS | gnd | | |
| 24 | VDD | 3v3 | | |
| 25 | PB12 | SPI2 NSS | AF5 | isolated |
| 26 | PB13 | SPI2 SCK | AF5 | external |
| 27 | PB14 | SPI2 MISO | AF5 | SPI |
| 28 | PB15 | SPI2 MOSI | AF5 | |
| 29 | PA8 | PA8 | gpio | reserved gpio |
| 30 | PA9 | USART1 TX | AF7 | RS-422 interface |
| 31 | PA10 | USART1 RX | AF7 | (opt) |
| 32 | PA11 | USB DM | AF14 | |
| 33 | PA12 | USB DP | AF14 | |
| 34 | PA13 | SWDIO | AF0 | |
| 35 | VSS | gnd | | |
| 36 | VDD | 3v3 | | |
| 37 | PA14 | SWCLK | AF0 | |
| 38 | PA15 | PA15 | gpio | reserved gpio |
| 39 | PB3 | SPI1 SCK | AF5 | SSI interface |
| 40 | PB4 | SPI1 MISO | AF5 | (opt) |
| 41 | PB5 | X | | |
| 42 | PB6 | I2C1 SCL | AF4 | non-isolated |
| 43 | PB7 | I2C1 SDA | AF4 | ext. I2C |
| 44 | BOOT0 | boot | | |
| 45 | PB8 | CAN RX | AF9 | |
| 46 | PB9 | CAN TX | AF9 | |
| 47 | VSS | gnd | | |
| 48 | VDD | 3v3 | | |
|---------|-------------|-------------|-------------|------------------|
### Sorted by port
// sort -Vk4 Readme.md
|**Pin #**|**Pin name **| **function**| **settings**|**comment ** |
|---------|-------------|-------------|-------------|------------------|
| 44 | BOOT0 | boot | | |
| 7 | NRST | reset | | |
| 10 | PA0 | AIN0 | A | |
| 11 | PA1 | AIN1 | A | |
| 12 | PA2 | ANI2 | A | |
| 13 | PA3 | AIN3 | A | |
| 14 | PA4 | DIN | I | mul0/1 input |
| 15 | PA5 | DEN0 | PP0 | enable mul0 |
| 16 | PA6 | DEN1 | PP0 | enable mul1 |
| 17 | PA7 | PWM | AF1 | TIM17CH1 PWM |
| 29 | PA8 | PA8 | gpio | reserved gpio |
| 30 | PA9 | USART1 TX | AF7 | RS-422 interface |
| 31 | PA10 | USART1 RX | AF7 | (opt) |
| 32 | PA11 | USB DM | AF14 | |
| 33 | PA12 | USB DP | AF14 | |
| 34 | PA13 | SWDIO | AF0 | |
| 37 | PA14 | SWCLK | AF0 | |
| 38 | PA15 | PA15 | gpio | reserved gpio |
| 18 | PB0 | ADDR0 | PP | MUL address |
| 19 | PB1 | ADDR1 | PP | selection |
| 20 | PB2 | ADDR2 | PP | |
| 39 | PB3 | SPI1 SCK | AF5 | SSI interface |
| 40 | PB4 | SPI1 MISO | AF5 | (opt) |
| 41 | PB5 | X | | |
| 42 | PB6 | I2C1 SCL | AF4 | non-isolated |
| 43 | PB7 | I2C1 SDA | AF4 | ext. I2C |
| 45 | PB8 | CAN RX | AF9 | |
| 46 | PB9 | CAN TX | AF9 | |
| 21 | PB10 | PB10 | gpio | reserved gpio |
| 22 | PB11 | PB11 | gpio | reserved gpio |
| 25 | PB12 | SPI2 NSS | AF5 | isolated |
| 26 | PB13 | SPI2 SCK | AF5 | external |
| 27 | PB14 | SPI2 MISO | AF5 | SPI |
| 28 | PB15 | SPI2 MOSI | AF5 | |
| 2 | PC13 | buzzer | PP1 | |
| 3 | PC14 | relay | PP1 | |
| 4 | PC15 | usb pullup | PP1 | |
| 5 | PF0 | OSCIN | | |
| 6 | PF1 | OSCOUT | | |
| 1 | VBAT | 3v3 | | |
| 9 | VDDA | 3v3 | | |
| 24 | VDD | 3v3 | | |
| 36 | VDD | 3v3 | | |
| 48 | VDD | 3v3 | | |
| 8 | VSSA | gnd | | |
| 23 | VSS | gnd | | |
| 35 | VSS | gnd | | |
| 47 | VSS | gnd | | |
|---------|-------------|-------------|-------------|------------------|
## DMA usage
### DMA1
### DMA2

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F3:F303/CANbus4BTA/adc.c Normal file
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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "adc.h"
#include "hardware.h" // ADCvals
/**
* @brief ADCx_array - arrays for ADC channels with median filtering:
* ADC1:
* 0..3 - AIN0..3 (ADC1_IN1..4)
* 4 - internal Tsens - ADC1_IN16
*/
static uint16_t ADC_array[NUMBER_OF_ADC_CHANNELS*9];
TRUE_INLINE void calADC(ADC_TypeDef *chnl){
// calibration
// enable voltage regulator
chnl->CR = 0;
chnl->CR = ADC_CR_ADVREGEN_0;
// wait for 10us
uint16_t ctr = 0;
while(++ctr < 1000){nop();}
// ADCALDIF=0 (single channels)
if((chnl->CR & ADC_CR_ADEN)){
chnl->CR |= ADC_CR_ADSTP;
chnl->CR |= ADC_CR_ADDIS;
}
chnl->CR |= ADC_CR_ADCAL;
while((chnl->CR & ADC_CR_ADCAL) != 0 && ++ctr < 0xfff0){};
chnl->CR = ADC_CR_ADVREGEN_0;
// enable ADC
ctr = 0;
do{
chnl->CR |= ADC_CR_ADEN;
}while((chnl->ISR & ADC_ISR_ADRDY) == 0 && ++ctr < 0xfff0);
}
TRUE_INLINE void enADC(ADC_TypeDef *chnl){
// ADEN->1, wait ADRDY
chnl->CR |= ADC_CR_ADEN;
uint16_t ctr = 0;
while(!(chnl->ISR & ADC_ISR_ADRDY) && ++ctr < 0xffff){}
chnl->CR |= ADC_CR_ADSTART; /* start the ADC conversions */
}
// Setup ADC
void adc_setup(){
IWDG->KR = IWDG_REFRESH;
RCC->AHBENR |= RCC_AHBENR_ADC12EN; // Enable clocking
ADC12_COMMON->CCR = ADC_CCR_TSEN | ADC_CCR_CKMODE; // enable Tsens, HCLK/4
calADC(ADC1);
// ADC1: channels 1-4,10,16; ADC2: channel 1
ADC1->SMPR1 = ADC_SMPR1_SMP1 | ADC_SMPR1_SMP2 | ADC_SMPR1_SMP3 | ADC_SMPR1_SMP4;
ADC1->SMPR2 = ADC_SMPR2_SMP16;
// 11 conversions in group: 1...10->16
ADC1->SQR1 = (1<<6) | (2<<12) | (3<<18) | (4<<24) | (NUMBER_OF_ADC_CHANNELS-1);
ADC1->SQR2 = (16<<0);
ADC2->SMPR1 = ADC_SMPR1_SMP1;
ADC2->SQR1 = (1<<6) | (NUMBER_OF_ADC2_CHANNELS-1);
// configure DMA for ADC
ADC1->CFGR = ADC_CFGR_CONT | ADC_CFGR_DMAEN | ADC_CFGR_DMACFG;
DMA1_Channel1->CPAR = (uint32_t) (&(ADC1->DR));
DMA1_Channel1->CMAR = (uint32_t)(ADC_array);
DMA1_Channel1->CNDTR = NUMBER_OF_ADC1_CHANNELS * 9;
DMA1_Channel1->CCR |= DMA_CCR_MINC | DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_0 | DMA_CCR_CIRC;
DMA1_Channel1->CCR |= DMA_CCR_EN;
enADC(ADC1);
}
/**
* @brief getADCval - calculate median value for `nch` channel
* @param nch - number of channel
* @return
*/
uint16_t getADCval(int nch){
register uint16_t temp;
#define PIX_SORT(a,b) { if ((a)>(b)) PIX_SWAP((a),(b)); }
#define PIX_SWAP(a,b) { temp=(a);(a)=(b);(b)=temp; }
uint16_t p[9];
int addr = nch, adval = NUMBER_OF_ADC1_CHANNELS;
if(nch >= NUMBER_OF_ADC1_CHANNELS){
adval = NUMBER_OF_ADC2_CHANNELS;
addr += ADC2START - NUMBER_OF_ADC1_CHANNELS;
}
for(int i = 0; i < 9; ++i, addr += adval) // first we should prepare array for optmed
p[i] = ADC_array[addr];
PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
PIX_SORT(p[0], p[1]) ; PIX_SORT(p[3], p[4]) ; PIX_SORT(p[6], p[7]) ;
PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
PIX_SORT(p[0], p[3]) ; PIX_SORT(p[5], p[8]) ; PIX_SORT(p[4], p[7]) ;
PIX_SORT(p[3], p[6]) ; PIX_SORT(p[1], p[4]) ; PIX_SORT(p[2], p[5]) ;
PIX_SORT(p[4], p[7]) ; PIX_SORT(p[4], p[2]) ; PIX_SORT(p[6], p[4]) ;
PIX_SORT(p[4], p[2]) ;
#undef PIX_SORT
#undef PIX_SWAP
return p[4];
}
// get voltage @input nch (V)
float getADCvoltage(uint16_t ADCval){
float v = (float)ADCval * 3.3;
return v/4096.f; // 12bit ADC
}
// return MCU temperature (degrees of celsius)
float getMCUtemp(){
float temperature = ADCvals[ADC_TSENS] - (float) *TEMP30_CAL_ADDR;
temperature *= (110.f - 30.f);
temperature /= (float)(*TEMP110_CAL_ADDR - *TEMP30_CAL_ADDR);
temperature += 30.f;
return(temperature);
}
// calculate R (Ohms) by given `ADCval` for main 10 ADC channels with 1k in upper arm of divider
float calcR(uint16_t ADCval){
return 1000.f/(4096.f/((float)ADCval) - 1.f);
}
/****** R(T, K):
T -= 273.15; % convert to K
_A = 3.9083e-03;
_B = -5.7750e-07;
_C = 0.;
if(T < 0.); _C = -4.1830e-12; endif
R = 1000.*(1 + _A*T + _B*T.^2 - _C.*T.^3*100. + _C.*T.^4);
=====> for T=[70:400] Kelvins
function T = pt1000Tapp(R)
k1 = 27.645;
k2 = 0.235268;
k3 = 1.0242e-05;
k4 = 0.;
if(R < 1000)
k1 = 31.067;
k2 = 2.2272e-01;
k3 = 2.5251e-05;
k4 = -5.9001e-09;
endif
T = k1 + k2*R + k3*R.^2 + k4*R.^3;
endfunction
mean(T-Tapp)= -3.3824e-04
std(T-Tapp')= 3.2089e-03
max(abs(T-Tapp'))= 0.011899
********/
// approximate calculation of T (K) for platinum 1k PTC
float calcT(uint16_t ADCval){
float R = calcR(ADCval);
if(R < 1000.){
return (31.067 + R * (2.2272e-01 + R * (2.5251e-05 - R * 5.9001e-09)));
}
return (27.645 + R * (0.235268 + R * 1.0242e-05));
}
// MPX5050: V=VS(P x 0.018 + 0.04); for 3v3 ADU=4096(P*0.018+0.04) ====>
// 0.018P=ADU/4096-0.04,
// P(kPa) = 55.556*(ADU/4096-0.04)
float calcPres5050(){
float adu = (float)ADCvals[ADC_EXT]/4096. - 0.04;
return 55.556*adu;
}

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F3:F303/CANbus4BTA/adc.h Normal file
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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
// ADC1 channels
#define NUMBER_OF_ADC_CHANNELS (5)
// channels of ADC in array
#define ADC_AIN0 (0)
#define ADC_AIN1 (1)
#define ADC_AIN2 (2)
#define ADC_AIN3 (3)
#define MERG(a,b) a ## b
#define ADC_CHAN(x) MERG(ADC_AIN, x)
#define ADC_TSENS (4)
void adc_setup();
float getMCUtemp();
uint16_t getADCval(int nch);
float getADCvoltage(uint16_t ADCval);

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F3:F303/CANbus4BTA/canbus4bta.cflags Normal file
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-std=c17

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F3:F303/CANbus4BTA/canbus4bta.config Normal file
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// Add predefined macros for your project here. For example:
// #define THE_ANSWER 42
#define EBUG
#define STM32F3
#define STM32F303xb
#define __thumb2__ 1
#define __ARM_ARCH_7M__

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F3:F303/CANbus4BTA/canbus4bta.creator Normal file
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F3:F303/CANbus4BTA/canbus4bta.creator.user Normal file
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1
F3:F303/CANbus4BTA/canbus4bta.cxxflags Normal file
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-std=c++17

17
F3:F303/CANbus4BTA/canbus4bta.files Normal file
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adc.c
adc.h
hardware.c
hardware.h
main.c
proto.c
proto.h
ringbuffer.c
ringbuffer.h
usart.c
usart.h
usb.c
usb.h
usb_lib.c
usb_lib.h
usbhw.c
usbhw.h

6
F3:F303/CANbus4BTA/canbus4bta.includes Normal file
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.
../inc
../inc/Fx
../inc/cm
../inc/ld
../inc/startup

48
F3:F303/CANbus4BTA/hardware.c Normal file
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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "adc.h"
#include "hardware.h"
#include "usart.h"
static inline void gpio_setup(){
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN | RCC_AHBENR_GPIOCEN;
// PWM - AF1 @PA7; USB - alternate function 14 @ pins PA11/PA12; USART1 = AF7 @PA9/10; SWD - AF0 @PA13/14
GPIOA->AFR[0] = AFRf(1, 7);
GPIOA->AFR[1] = AFRf(7, 9) | AFRf(7, 10) | AFRf(14, 11) | AFRf(14, 12);
// USART1: PA10(Rx), PA9(Tx); USB - PA11, PA12; SWDIO - PA13, PA14;
GPIOA->MODER = MODER_AI(0) | MODER_AI(1) | MODER_AI(2) | MODER_AI(3) | MODER_I(4) | MODER_O(5) |
MODER_O(6) | MODER_AF(7) | MODER_I(8) | MODER_AF(9) | MODER_AF(10) | MODER_AF(11) |
MODER_AF(12) | MODER_AF(13) | MODER_AF(14) | MODER_I(15);
GPIOA->OSPEEDR = OSPEED_MED(7) | OSPEED_MED(9) | OSPEED_MED(10) | OSPEED_HI(11) | OSPEED_HI(12) | OSPEED_HI(13) | OSPEED_HI(14);
// SPI for SSI: AF5 @PB3, PB4; I2C1: AF4 @PB6, PB7; CAN: AF9 @PB8, PB9; SPI2: AF5 @PB12..PB15
GPIOB->AFR[0] = AFRf(5, 3) | AFRf(5, 4) | AFRf(4, 6) | AFRf(4, 7);
GPIOB->AFR[1] = AFRf(9, 8) | AFRf(9, 9) | AFRf(5, 12) | AFRf(5, 13) | AFRf(5, 14) | AFRf(5, 15);
GPIOB->MODER = MODER_O(0) | MODER_O(1) | MODER_O(2) | MODER_AF(3) | MODER_AF(4) | MODER_AF(6) | MODER_AF(7) |
MODER_AF(8) | MODER_AF(9) | MODER_I(10) | MODER_I(11) | MODER_AF(12) | MODER_AF(13) |
MODER_AF(14) | MODER_AF(15);
GPIOB->OSPEEDR = OSPEED_HI(3) | OSPEED_HI(4) | OSPEED_HI(6) | OSPEED_HI(7) | OSPEED_HI(8) | OSPEED_HI(9) |
OSPEED_HI(12) | OSPEED_HI(13) | OSPEED_HI(14) | OSPEED_HI(15);
GPIOC->MODER = MODER_O(13) | MODER_O(14) | MODER_O(15);
}
void hw_setup(){
gpio_setup();
adc_setup();
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
#define USBPU_port GPIOC
#define USBPU_pin (1<<15)
#define USBPU_ON() pin_set(USBPU_port, USBPU_pin)
#define USBPU_OFF() pin_clear(USBPU_port, USBPU_pin)
extern volatile uint32_t Tms;
void hw_setup();

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "hardware.h"
#include "proto.h"
#include "usart.h"
#include "usb.h"
#define MAXSTRLEN RBINSZ
volatile uint32_t Tms = 0;
void sys_tick_handler(void){
++Tms;
}
int main(void){
char inbuff[MAXSTRLEN+1];
USBPU_OFF();
if(StartHSE()){
SysTick_Config((uint32_t)72000); // 1ms
}else{
StartHSI();
SysTick_Config((uint32_t)48000); // 1ms
}
hw_setup();
usart_setup();
USB_setup();
USBPU_ON();
while(1){
if(bufovr){
bufovr = 0;
usart_send("bufovr\n");
}
char *txt = NULL;
if(usart_getline(&txt)){
const char *ans = parse_cmd(txt);
if(ans) usart_send(ans);
}
int l = USB_receivestr(inbuff, MAXSTRLEN);
if(l < 0) USB_sendstr("ERROR: USB buffer overflow or string was too long\n");
else if(l){
const char *ans = parse_cmd(inbuff);
if(ans) USB_sendstr(ans);
}
}
}

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F3:F303/CANbus4BTA/openocd.cfg Normal file
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set FLASH_SIZE 0x20000
source [find interface/stlink-v2-1.cfg]
source [find target/stm32f3x.cfg]

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "adc.h"
#include "proto.h"
#include "usart.h"
#include "usb.h"
#include "version.inc"
uint8_t starttest = 0;
char *omit_spaces(const char *buf){
while(*buf){
if(*buf > ' ') break;
++buf;
}
return (char*)buf;
}
// In case of overflow return `buf` and N==0xffffffff
// read decimal number & return pointer to next non-number symbol
static char *getdec(const char *buf, uint32_t *N){
char *start = (char*)buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
if(c < '0' || c > '9'){
break;
}
if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
*N = 0xffffff;
return start;
}
num *= 10;
num += c - '0';
++buf;
}
*N = num;
return (char*)buf;
}
// read hexadecimal number (without 0x prefix!)
static char *gethex(const char *buf, uint32_t *N){
char *start = (char*)buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
uint8_t M = 0;
if(c >= '0' && c <= '9'){
M = '0';
}else if(c >= 'A' && c <= 'F'){
M = 'A' - 10;
}else if(c >= 'a' && c <= 'f'){
M = 'a' - 10;
}
if(M){
if(num & 0xf0000000){ // overflow
*N = 0xffffff;
return start;
}
num <<= 4;
num += c - M;
}else{
break;
}
++buf;
}
*N = num;
return (char*)buf;
}
// read octal number (without 0 prefix!)
static char *getoct(const char *buf, uint32_t *N){
char *start = (char*)buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
if(c < '0' || c > '7'){
break;
}
if(num & 0xe0000000){ // overflow
*N = 0xffffff;
return start;
}
num <<= 3;
num += c - '0';
++buf;
}
*N = num;
return (char*)buf;
}
// read binary number (without b prefix!)
static char *getbin(const char *buf, uint32_t *N){
char *start = (char*)buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
if(c < '0' || c > '1'){
break;
}
if(num & 0x80000000){ // overflow
*N = 0xffffff;
return start;
}
num <<= 1;
if(c == '1') num |= 1;
++buf;
}
*N = num;
return (char*)buf;
}
/**
* @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
* @param buf - buffer with number and so on
* @param N - the number read
* @return pointer to first non-number symbol in buf
* (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
*/
char *getnum(const char *txt, uint32_t *N){
char *nxt = NULL;
char *s = omit_spaces(txt);
if(*s == '0'){ // hex, oct or 0
if(s[1] == 'x' || s[1] == 'X'){ // hex
nxt = gethex(s+2, N);
if(nxt == s+2) nxt = (char*)txt;
}else if(s[1] > '0'-1 && s[1] < '8'){ // oct
nxt = getoct(s+1, N);
if(nxt == s+1) nxt = (char*)txt;
}else{ // 0
nxt = s+1;
*N = 0;
}
}else if(*s == 'b' || *s == 'B'){
nxt = getbin(s+1, N);
if(nxt == s+1) nxt = (char*)txt;
}else{
nxt = getdec(s, N);
if(nxt == s) nxt = (char*)txt;
}
return nxt;
}
const char* helpmsg =
"https://github.com/eddyem/stm32samples/tree/master/F3:F303/CANbus4BTA build#" BUILD_NUMBER " @ " BUILD_DATE "\n"
"'i' - print USB->ISTR state\n"
"'p' - toggle USB pullup\n"
"'N' - read number (dec, 0xhex, 0oct, bbin) and show it in decimal\n"
"'R' - software reset\n"
"'T' - test usb sending a very large message\n"
"'U' - get USB status\n"
"'W' - test watchdog\n"
;
static char stbuf[256], *bptr = NULL;
static int blen = 0;
static void initbuf(){bptr = stbuf; blen = 255; *bptr = 0;}
static void add2buf(const char *s){
while(blen && *s){
*bptr++ = *s++;
--blen;
}
*bptr = 0;
}
extern uint8_t usbON;
const char *parse_cmd(const char *buf){
initbuf();
if(buf[1] == '\n' || !buf[1]){ // one symbol commands
switch(*buf){
case 'i':
add2buf("USB->ISTR=");
add2buf(u2hexstr(USB->ISTR));
add2buf(", USB->CNTR=");
add2buf(u2hexstr(USB->CNTR));
add2buf("\n");
break;
case 'p':
pin_toggle(USBPU_port, USBPU_pin);
add2buf("USB pullup is ");
if(pin_read(USBPU_port, USBPU_pin)) add2buf("off\n");
else add2buf("on\n");
break;
case 'R':
USB_sendstr("Soft reset\n");
usart_send("Soft reset\n");
NVIC_SystemReset();
break;
case 'T':
add2buf("STARTT=");
add2buf(u2str(Tms)); add2buf("\n");
starttest = 10;
break;
case 'U':
add2buf("USB status: ");
if(usbON) add2buf("ON");
else add2buf("OFF");
add2buf("\n");
break;
case 'W':
USB_sendstr("Wait for reboot\n");
usart_send("Wait for reboot\n");
while(1){nop();};
break;
default:
return helpmsg;
}
return stbuf;
}
uint32_t Num = 0;
char *nxt;
switch(*buf){ // long messages
case 'N':
++buf;
nxt = getnum(buf, &Num);
if(buf == nxt){
if(Num == 0) return "Wrong number\n";
return "Integer32 overflow\n";
}
add2buf("You give: ");
add2buf(u2str(Num));
if(*nxt && *nxt != '\n'){
add2buf(", the rest of string: ");
add2buf(nxt);
}else add2buf("\n");
break;
default:
return buf;
}
return stbuf;
}
// return string with number `val`
char *u2str(uint32_t val){
static char strbuf[11];
char *bufptr = &strbuf[10];
*bufptr = 0;
if(!val){
*(--bufptr) = '0';
}else{
while(val){
*(--bufptr) = val % 10 + '0';
val /= 10;
}
}
return bufptr;
}
char *u2hexstr(uint32_t val){
static char strbuf[11] = "0x";
char *sptr = strbuf + 2;
uint8_t *ptr = (uint8_t*)&val + 3;
int8_t i, j, z=1;
for(i = 0; i < 4; ++i, --ptr){
if(*ptr == 0){ // omit leading zeros
if(i == 3) z = 0;
if(z) continue;
}
else z = 0;
for(j = 1; j > -1; --j){
uint8_t half = (*ptr >> (4*j)) & 0x0f;
if(half < 10) *sptr++ = half + '0';
else *sptr++ = half - 10 + 'a';
}
}
*sptr = 0;
return strbuf;
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
extern uint8_t starttest;
const char *parse_cmd(const char *buf);
char *omit_spaces(const char *buf);
char *getnum(const char *buf, uint32_t *N);
char *u2str(uint32_t val);
char *u2hexstr(uint32_t val);

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F3:F303/CANbus4BTA/ringbuffer.c Normal file
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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ringbuffer.h"
// stored data length
int RB_datalen(ringbuffer *b){
if(b->tail >= b->head) return (b->tail - b->head);
else return (b->length - b->head + b->tail);
}
/**
* @brief RB_hasbyte - check if buffer has given byte stored
* @param b - buffer
* @param byte - byte to find
* @return index if found, -1 if none
*/
int RB_hasbyte(ringbuffer *b, uint8_t byte){
if(b->head == b->tail) return -1; // no data in buffer
int startidx = b->head;
if(b->head > b->tail){ //
for(int found = b->head; found < b->length; ++found)
if(b->data[found] == byte) return found;
startidx = 0;
}
for(int found = startidx; found < b->tail; ++found)
if(b->data[found] == byte) return found;
return -1;
}
// poor memcpy
static void mcpy(uint8_t *targ, const uint8_t *src, int l){
while(l--) *targ++ = *src++;
}
// increment head or tail
TRUE_INLINE void incr(ringbuffer *b, volatile int *what, int n){
*what += n;
if(*what >= b->length) *what -= b->length;
}
/**
* @brief RB_read - read data from ringbuffer
* @param b - buffer
* @param s - array to write data
* @param len - max len of `s`
* @return bytes read
*/
int RB_read(ringbuffer *b, uint8_t *s, int len){
int l = RB_datalen(b);
if(!l) return 0;
if(l > len) l = len;
int _1st = b->length - b->head;
if(_1st > l) _1st = l;
if(_1st > len) _1st = len;
mcpy(s, b->data + b->head, _1st);
if(_1st < len && l > _1st){
mcpy(s+_1st, b->data, l - _1st);
incr(b, &b->head, l);
return l;
}
incr(b, &b->head, _1st);
return _1st;
}
/**
* @brief RB_readto fill array `s` with data until byte `byte` (with it)
* @param b - ringbuffer
* @param byte - check byte
* @param s - buffer to write data
* @param len - length of `s`
* @return amount of bytes written (negative, if len<data in buffer)
*/
int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
int idx = RB_hasbyte(b, byte);
if(idx < 0) return 0;
int partlen = idx + 1 - b->head;
// now calculate length of new data portion
if(idx < b->head) partlen += b->length;
if(partlen > len) return -RB_read(b, s, len);
return RB_read(b, s, partlen);
}
/**
* @brief RB_write - write some data to ringbuffer
* @param b - buffer
* @param str - data
* @param l - length
* @return amount of bytes written
*/
int RB_write(ringbuffer *b, const uint8_t *str, int l){
int r = b->length - 1 - RB_datalen(b); // rest length
if(l > r) l = r;
if(!l) return 0;
int _1st = b->length - b->tail;
if(_1st > l) _1st = l;
mcpy(b->data + b->tail, str, _1st);
if(_1st < l){ // add another piece from start
mcpy(b->data, str+_1st, l-_1st);
}
incr(b, &b->tail, l);
return l;
}
// just delete all information in buffer `b`
void RB_clearbuf(ringbuffer *b){
b->head = 0;
b->tail = 0;
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
typedef struct{
uint8_t *data; // data buffer
const int length; // its length
int head; // head index
int tail; // tail index
} ringbuffer;
int RB_read(ringbuffer *b, uint8_t *s, int len);
int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len);
int RB_hasbyte(ringbuffer *b, uint8_t byte);
int RB_write(ringbuffer *b, const uint8_t *str, int l);
int RB_datalen(ringbuffer *b);
void RB_clearbuf(ringbuffer *b);

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stm32f3.h"
#include "hardware.h"
#include "usart.h"
#include <string.h>
static volatile int idatalen = 0; // received data line length (including '\n')
volatile int linerdy = 0, // received data ready
dlen = 0, // length of data (including '\n') in current buffer
bufovr = 0; // input buffer overfull
static volatile int rbufno = 0; // current rbuf number
static char rbuf[2][UARTBUFSZ]; // receive buffers
static volatile char *recvdata = NULL;
/**
* return length of received data (without trailing zero)
*/
int usart_getline(char **line){
if(bufovr){
bufovr = 0;
linerdy = 0;
return 0;
}
if(!linerdy) return 0;
*line = (char*)recvdata;
linerdy = 0;
return dlen;
}
void usart_putchar(const char ch){
while(!(USART1->ISR & USART_ISR_TXE));
USART1->TDR = ch;
}
void usart_sendn(const char *str, int L){
if(!str) return;
for(int i = 0; i < L; ++i){
usart_putchar(str[i]);
}
}
void usart_send(const char *str){
if(!str) return;
int L = 0;
const char *ptr = str;
while(*ptr++) ++L;
usart_sendn(str, L);
}
void usart_setup(){
// clock
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
USART1->ICR = 0xffffffff; // clear all flags
USART1->BRR = SysFreq / 115200;
USART1->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE | USART_CR1_RXNEIE; // 1start,8data,nstop; enable Rx,Tx,USART
uint32_t tmout = 16000000;
while(!(USART1->ISR & USART_ISR_TC)){if(--tmout == 0) break;} // polling idle frame Transmission
USART1->ICR = 0xffffffff; // clear all flags again
NVIC_SetPriority(USART1_IRQn, 0);
NVIC_EnableIRQ(USART1_IRQn);
}
void usart1_exti25_isr(){
if(USART1->ISR & USART_ISR_RXNE){ // RX not emty - receive next char
// read RDR clears flag
uint8_t rb = USART1->RDR;
if(idatalen < UARTBUFSZ){ // put next char into buf
rbuf[rbufno][idatalen++] = rb;
if(rb == '\n'){ // got newline - line ready
linerdy = 1;
dlen = idatalen;
recvdata = rbuf[rbufno];
recvdata[dlen-1] = 0;
// prepare other buffer
rbufno = !rbufno;
idatalen = 0;
}
}else{ // buffer overrun
bufovr = 1;
idatalen = 0;
}
}
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "hardware.h"
// input buffers size
#define UARTBUFSZ (80)
extern volatile int linerdy, bufovr;
void usart_setup();
int usart_getline(char **line);
void usart_send(const char *str);
void usart_sendn(const char *str, int L);
void usart_putchar(const char ch);

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "hardware.h"
#include "usb.h"
#include "usb_lib.h"
static volatile uint8_t usbbuff[USB_TXBUFSZ]; // temporary buffer for sending data
// ring buffers for incoming and outgoing data
static uint8_t obuf[RBOUTSZ], ibuf[RBINSZ];
volatile ringbuffer rbout = {.data = obuf, .length = RBOUTSZ, .head = 0, .tail = 0};
volatile ringbuffer rbin = {.data = ibuf, .length = RBINSZ, .head = 0, .tail = 0};
// transmission is succesfull
volatile uint8_t bufisempty = 1;
volatile uint8_t bufovrfl = 0;
void send_next(){
if(bufisempty) return;
static int lastdsz = 0;
int buflen = RB_read((ringbuffer*)&rbout, (uint8_t*)usbbuff, USB_TXBUFSZ);
if(!buflen){
if(lastdsz == 64) EP_Write(3, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
lastdsz = 0;
bufisempty = 1;
return;
}
EP_Write(3, (uint8_t*)usbbuff, buflen);
lastdsz = buflen;
}
// blocking send full content of ring buffer
int USB_sendall(){
while(!bufisempty){
if(!usbON) return 0;
}
return 1;
}
// put `buf` into queue to send
int USB_send(const uint8_t *buf, int len){
if(!buf || !usbON || !len) return 0;
while(len){
int a = RB_write((ringbuffer*)&rbout, buf, len);
len -= a;
buf += a;
if(bufisempty){
bufisempty = 0;
send_next();
}
}
return 1;
}
int USB_putbyte(uint8_t byte){
if(!usbON) return 0;
while(0 == RB_write((ringbuffer*)&rbout, &byte, 1)){
if(bufisempty){
bufisempty = 0;
send_next();
}
}
return 1;
}
int USB_sendstr(const char *string){
if(!string || !usbON) return 0;
int len = 0;
const char *b = string;
while(*b++) ++len;
if(!len) return 0;
return USB_send((const uint8_t*)string, len);
}
/**
* @brief USB_receive - get binary data from receiving ring-buffer
* @param buf (i) - buffer for received data
* @param len - length of `buf`
* @return amount of received bytes (negative, if overfull happened)
*/
int USB_receive(uint8_t *buf, int len){
int sz = RB_read((ringbuffer*)&rbin, buf, len);
if(bufovrfl){
RB_clearbuf((ringbuffer*)&rbin);
if(!sz) sz = -1;
else sz = -sz;
bufovrfl = 0;
}
return sz;
}
/**
* @brief USB_receivestr - get string up to '\n' and replace '\n' with 0
* @param buf - receiving buffer
* @param len - its length
* @return strlen or negative value indicating overflow (if so, string won't be ends with 0 and buffer should be cleared)
*/
int USB_receivestr(char *buf, int len){
int l = RB_readto((ringbuffer*)&rbin, '\n', (uint8_t*)buf, len);
if(l == 0) return 0;
if(--l < 0 || bufovrfl) RB_clearbuf((ringbuffer*)&rbin);
else buf[l] = 0; // replace '\n' with strend
if(bufovrfl){
if(l > 0) l = -l;
else l = -1;
bufovrfl = 0;
}
return l;
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "ringbuffer.h"
#include "usbhw.h"
// sizes of ringbuffers for outgoing and incoming data
#define RBOUTSZ (512)
#define RBINSZ (512)
#define newline() USB_putbyte('\n')
#define USND(s) do{USB_sendstr(s); USB_putbyte('\n');}while(0)
#define STR_HELPER(s) #s
#define STR(s) STR_HELPER(s)
#ifdef EBUG
#define DBG(str) do{USB_sendstr(__FILE__ " (L" STR(__LINE__) "): " str); newline();}while(0)
#else
#define DBG(str)
#endif
extern volatile ringbuffer rbout, rbin;
extern volatile uint8_t bufisempty, bufovrfl;
void send_next();
int USB_sendall();
int USB_send(const uint8_t *buf, int len);
int USB_putbyte(uint8_t byte);
int USB_sendstr(const char *string);
int USB_receive(uint8_t *buf, int len);
int USB_receivestr(char *buf, int len);

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include "usb.h"
#include "usb_lib.h"
#include "usbhw.h"
ep_t endpoints[STM32ENDPOINTS];
static uint16_t USB_Addr = 0;
static usb_LineCoding lineCoding = {115200, 0, 0, 8};
uint8_t ep0databuf[EP0DATABUF_SIZE], setupdatabuf[EP0DATABUF_SIZE];
static config_pack_t *setup_packet = (config_pack_t*) setupdatabuf;
usb_LineCoding getLineCoding(){return lineCoding;}
volatile uint8_t usbON = 0; // device disconnected from terminal
// definition of parts common for USB_DeviceDescriptor & USB_DeviceQualifierDescriptor
#define bcdUSB_L 0x10
#define bcdUSB_H 0x01
#define bDeviceClass 0
#define bDeviceSubClass 0
#define bDeviceProtocol 0
#define bNumConfigurations 1
static const uint8_t USB_DeviceDescriptor[] = {
18, // bLength
0x01, // bDescriptorType - Device descriptor
bcdUSB_L, // bcdUSB_L - 1.10
bcdUSB_H, // bcdUSB_H
bDeviceClass, // bDeviceClass - USB_COMM
bDeviceSubClass, // bDeviceSubClass
bDeviceProtocol, // bDeviceProtocol
USB_EP0_BUFSZ, // bMaxPacketSize
0x7b, // idVendor_L PL2303: VID=0x067b, PID=0x2303
0x06, // idVendor_H
0x03, // idProduct_L
0x23, // idProduct_H
0x00, // bcdDevice_Ver_L
0x03, // bcdDevice_Ver_H
iMANUFACTURER_DESCR, // iManufacturer
iPRODUCT_DESCR, // iProduct
iSERIAL_DESCR, // iSerialNumber
bNumConfigurations // bNumConfigurations
};
static const uint8_t USB_DeviceQualifierDescriptor[] = {
10, //bLength
0x06, // bDescriptorType - Device qualifier
bcdUSB_L, // bcdUSB_L
bcdUSB_H, // bcdUSB_H
bDeviceClass, // bDeviceClass
bDeviceSubClass, // bDeviceSubClass
bDeviceProtocol, // bDeviceProtocol
USB_EP0_BUFSZ, // bMaxPacketSize0
bNumConfigurations, // bNumConfigurations
0x00 // Reserved
};
static const uint8_t USB_ConfigDescriptor[] = {
/*Configuration Descriptor*/
0x09, /* bLength: Configuration Descriptor size */
0x02, /* bDescriptorType: Configuration */
39, /* wTotalLength:no of returned bytes */
0x00,
0x01, /* bNumInterfaces: 1 interface */
0x01, /* bConfigurationValue: Configuration value */
0x00, /* iConfiguration: Index of string descriptor describing the configuration */
0xa0, /* bmAttributes - Bus powered, Remote wakeup */
0x32, /* MaxPower 100 mA */
/*---------------------------------------------------------------------------*/
/*Interface Descriptor */
0x09, /* bLength: Interface Descriptor size */
0x04, /* bDescriptorType: Interface */
0x00, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x03, /* bNumEndpoints: 3 endpoints used */
0xff, /* bInterfaceClass */
0x00, /* bInterfaceSubClass */
0x00, /* bInterfaceProtocol */
iINTERFACE_DESCR, /* iInterface: */
///////////////////////////////////////////////////
/*Endpoint 1 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
0x81, /* bEndpointAddress IN1 */
0x03, /* bmAttributes: Interrupt */
0x0a, /* wMaxPacketSize LO: */
0x00, /* wMaxPacketSize HI: */
0x01, /* bInterval: */
/*Endpoint OUT2 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
0x02, /* bEndpointAddress: OUT2 */
0x02, /* bmAttributes: Bulk */
(USB_RXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
(USB_RXBUFSZ >> 8),
0x00, /* bInterval: ignore for Bulk transfer */
/*Endpoint IN3 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
0x83, /* bEndpointAddress IN3 */
0x02, /* bmAttributes: Bulk */
(USB_TXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
(USB_TXBUFSZ >> 8),
0x00, /* bInterval: ignore for Bulk transfer */
};
_USB_LANG_ID_(LD, LANG_US);
_USB_STRING_(SD, u"0.0.1");
_USB_STRING_(MD, u"Prolific Technology Inc.");
_USB_STRING_(PD, u"USB-Serial Controller");
_USB_STRING_(ID, u"canbusbta");
static void const *StringDescriptor[iDESCR_AMOUNT] = {
[iLANGUAGE_DESCR] = &LD,
[iMANUFACTURER_DESCR] = &MD,
[iPRODUCT_DESCR] = &PD,
[iSERIAL_DESCR] = &SD,
[iINTERFACE_DESCR] = &ID
};
/*
* default handlers
*/
// SET_LINE_CODING
void WEAK linecoding_handler(usb_LineCoding __attribute__((unused)) *lc){
}
// SET_CONTROL_LINE_STATE
void WEAK clstate_handler(uint16_t __attribute__((unused)) val){
}
// SEND_BREAK
void WEAK break_handler(){
}
// handler of vendor requests
void WEAK vendor_handler(config_pack_t *packet){
uint16_t c;
if(packet->bmRequestType & 0x80){ // read
switch(packet->wValue){
case 0x8484:
c = 2;
break;
case 0x0080:
c = 1;
break;
case 0x8686:
c = 0xaa;
break;
default:
c = 0;
}
EP_WriteIRQ(0, (uint8_t*)&c, 1);
}else{ // write ZLP
c = 0;
EP_WriteIRQ(0, (uint8_t *)&c, 0);
}
}
static void wr0(const uint8_t *buf, uint16_t size){
if(setup_packet->wLength < size) size = setup_packet->wLength; // shortened request
if(size < endpoints[0].txbufsz){
EP_WriteIRQ(0, buf, size);
return;
}
while(size){
uint16_t l = size;
if(l > endpoints[0].txbufsz) l = endpoints[0].txbufsz;
EP_WriteIRQ(0, buf, l);
buf += l;
size -= l;
uint8_t needzlp = (l == endpoints[0].txbufsz) ? 1 : 0;
if(size || needzlp){ // send last data buffer
uint16_t status = KEEP_DTOG(USB->EPnR[0]);
// keep DTOGs, clear CTR_RX,TX, set TX VALID, leave stat_Rx
USB->EPnR[0] = (status & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX|USB_EPnR_STAT_RX))
^ USB_EPnR_STAT_TX;
uint32_t ctr = 1000000;
while(--ctr && (USB->ISTR & USB_ISTR_CTR) == 0){IWDG->KR = IWDG_REFRESH;};
if((USB->ISTR & USB_ISTR_CTR) == 0){
return;
}
if(needzlp) EP_WriteIRQ(0, (uint8_t*)0, 0);
}
}
}
static inline void get_descriptor(){
uint8_t descrtype = setup_packet->wValue >> 8,
descridx = setup_packet->wValue & 0xff;
switch(descrtype){
case DEVICE_DESCRIPTOR:
wr0(USB_DeviceDescriptor, sizeof(USB_DeviceDescriptor));
break;
case CONFIGURATION_DESCRIPTOR:
wr0(USB_ConfigDescriptor, sizeof(USB_ConfigDescriptor));
break;
case STRING_DESCRIPTOR:
if(descridx < iDESCR_AMOUNT) wr0((const uint8_t *)StringDescriptor[descridx], *((uint8_t*)StringDescriptor[descridx]));
else EP_WriteIRQ(0, (uint8_t*)0, 0);
break;
case DEVICE_QUALIFIER_DESCRIPTOR:
wr0(USB_DeviceQualifierDescriptor, USB_DeviceQualifierDescriptor[0]);
break;
default:
break;
}
}
static uint16_t configuration = 0; // reply for GET_CONFIGURATION (==1 if configured)
static inline void std_d2h_req(){
uint16_t status = 0; // bus powered
switch(setup_packet->bRequest){
case GET_DESCRIPTOR:
get_descriptor();
break;
case GET_STATUS:
EP_WriteIRQ(0, (uint8_t *)&status, 2); // send status: Bus Powered
break;
case GET_CONFIGURATION:
EP_WriteIRQ(0, (uint8_t*)&configuration, 1);
break;
default:
break;
}
}
// interrupt IN handler (never used?)
static void EP1_Handler(){
uint16_t epstatus = KEEP_DTOG(USB->EPnR[1]);
if(RX_FLAG(epstatus)) epstatus = (epstatus & ~USB_EPnR_STAT_TX) ^ USB_EPnR_STAT_RX; // set valid RX
else epstatus = epstatus & ~(USB_EPnR_STAT_TX|USB_EPnR_STAT_RX);
// clear CTR
epstatus = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX));
USB->EPnR[1] = epstatus;
}
// data IN/OUT handlers
static void transmit_Handler(){ // EP3IN
uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[3]);
// clear CTR keep DTOGs & STATs
USB->EPnR[3] = (epstatus & ~(USB_EPnR_CTR_TX)); // clear TX ctr
send_next();
}
static void receive_Handler(){ // EP2OUT
uint8_t buf[USB_RXBUFSZ];
uint16_t epstatus = KEEP_DTOG(USB->EPnR[2]);
uint8_t sz = EP_Read(2, (uint8_t*)buf);
if(sz){
if(RB_write((ringbuffer*)&rbin, buf, sz) != sz) bufovrfl = 1;
}
// keep stat_tx & set ACK rx, clear RX ctr
USB->EPnR[2] = (epstatus & ~USB_EPnR_CTR_RX) ^ USB_EPnR_STAT_RX;
}
static inline void std_h2d_req(){
switch(setup_packet->bRequest){
case SET_ADDRESS:
// new address will be assigned later - after acknowlegement or request to host
USB_Addr = setup_packet->wValue;
break;
case SET_CONFIGURATION:
// Now device configured
configuration = setup_packet->wValue;
EP_Init(1, EP_TYPE_INTERRUPT, USB_EP1BUFSZ, 0, EP1_Handler); // IN1 - transmit
EP_Init(2, EP_TYPE_BULK, 0, USB_RXBUFSZ, receive_Handler); // OUT2 - receive data
EP_Init(3, EP_TYPE_BULK, USB_TXBUFSZ, 0, transmit_Handler); // IN3 - transmit data
break;
default:
break;
}
}
/*
bmRequestType: 76543210
7 direction: 0 - host->device, 1 - device->host
65 type: 0 - standard, 1 - class, 2 - vendor
4..0 getter: 0 - device, 1 - interface, 2 - endpoint, 3 - other
*/
/**
* Endpoint0 (control) handler
*/
void EP0_Handler(){
uint16_t epstatus = USB->EPnR[0]; // EP0R on input -> return this value after modifications
uint8_t reqtype = setup_packet->bmRequestType & 0x7f;
uint8_t dev2host = (setup_packet->bmRequestType & 0x80) ? 1 : 0;
int rxflag = RX_FLAG(epstatus);
if(rxflag && SETUP_FLAG(epstatus)){
switch(reqtype){
case STANDARD_DEVICE_REQUEST_TYPE: // standard device request
if(dev2host){
std_d2h_req();
}else{
std_h2d_req();
EP_WriteIRQ(0, (uint8_t *)0, 0);
}
break;
case STANDARD_ENDPOINT_REQUEST_TYPE: // standard endpoint request
if(setup_packet->bRequest == CLEAR_FEATURE){
EP_WriteIRQ(0, (uint8_t *)0, 0);
}
break;
case VENDOR_REQUEST_TYPE:
vendor_handler(setup_packet);
break;
case CONTROL_REQUEST_TYPE:
switch(setup_packet->bRequest){
case GET_LINE_CODING:
EP_WriteIRQ(0, (uint8_t*)&lineCoding, sizeof(lineCoding));
break;
case SET_LINE_CODING: // omit this for next stage, when data will come
break;
case SET_CONTROL_LINE_STATE:
usbON = 1;
clstate_handler(setup_packet->wValue);
break;
case SEND_BREAK:
usbON = 0;
break_handler();
break;
default:
break;
}
if(setup_packet->bRequest != GET_LINE_CODING) EP_WriteIRQ(0, (uint8_t *)0, 0); // write acknowledgement
break;
default:
EP_WriteIRQ(0, (uint8_t *)0, 0);
}
}else if(rxflag){ // got data over EP0 or host acknowlegement
if(endpoints[0].rx_cnt){
if(setup_packet->bRequest == SET_LINE_CODING){
linecoding_handler((usb_LineCoding*)ep0databuf);
}
}
} else if(TX_FLAG(epstatus)){ // package transmitted
// now we can change address after enumeration
if ((USB->DADDR & USB_DADDR_ADD) != USB_Addr){
USB->DADDR = USB_DADDR_EF | USB_Addr;
usbON = 0;
}
}
epstatus = KEEP_DTOG(USB->EPnR[0]);
if(rxflag) epstatus ^= USB_EPnR_STAT_TX; // start ZLP/data transmission
else epstatus &= ~USB_EPnR_STAT_TX; // or leave unchanged
// keep DTOGs, clear CTR_RX,TX, set RX VALID
USB->EPnR[0] = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX)) ^ USB_EPnR_STAT_RX;
}
/**
* Write data to EP buffer (called from IRQ handler)
* @param number - EP number
* @param *buf - array with data
* @param size - its size
*/
void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size){
if(size > endpoints[number].txbufsz) size = endpoints[number].txbufsz;
uint16_t N2 = (size + 1) >> 1;
// the buffer is 16-bit, so we should copy data as it would be uint16_t
uint16_t *buf16 = (uint16_t *)buf;
#if defined USB1_16
// very bad: what if `size` is odd?
uint32_t *out = (uint32_t *)endpoints[number].tx_buf;
for(int i = 0; i < N2; ++i, ++out){
*out = buf16[i];
}
#elif defined USB2_16
// use memcpy instead?
for(int i = 0; i < N2; i++){
endpoints[number].tx_buf[i] = buf16[i];
}
#else
#error "Define USB1_16 or USB2_16"
#endif
USB_BTABLE->EP[number].USB_COUNT_TX = size;
}
/**
* Write data to EP buffer (called outside IRQ handler)
* @param number - EP number
* @param *buf - array with data
* @param size - its size
*/
void EP_Write(uint8_t number, const uint8_t *buf, uint16_t size){
EP_WriteIRQ(number, buf, size);
uint16_t status = KEEP_DTOG(USB->EPnR[number]);
// keep DTOGs, clear CTR_TX & set TX VALID to start transmission
USB->EPnR[number] = (status & ~(USB_EPnR_CTR_TX)) ^ USB_EPnR_STAT_TX;
}
/*
* Copy data from EP buffer into user buffer area
* @param *buf - user array for data
* @return amount of data read
*/
int EP_Read(uint8_t number, uint8_t *buf){
int sz = endpoints[number].rx_cnt;
if(!sz) return 0;
endpoints[number].rx_cnt = 0;
#if defined USB1_16
int n = (sz + 1) >> 1;
uint32_t *in = (uint32_t*)endpoints[number].rx_buf;
uint16_t *out = (uint16_t*)buf;
for(int i = 0; i < n; ++i, ++in)
out[i] = *(uint16_t*)in;
#elif defined USB2_16
// use memcpy instead?
for(int i = 0; i < sz; ++i)
buf[i] = endpoints[number].rx_buf[i];
#else
#error "Define USB1_16 or USB2_16"
#endif
return sz;
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <wchar.h>
#include "usbhw.h"
#define EP0DATABUF_SIZE (64)
#define LASTADDR_DEFAULT (STM32ENDPOINTS * 8)
// bmRequestType & 0x7f
#define STANDARD_DEVICE_REQUEST_TYPE 0
#define STANDARD_ENDPOINT_REQUEST_TYPE 2
#define VENDOR_REQUEST_TYPE 0x40
#define CONTROL_REQUEST_TYPE 0x21
// bRequest, standard; for bmRequestType == 0x80
#define GET_STATUS 0x00
#define GET_DESCRIPTOR 0x06
#define GET_CONFIGURATION 0x08
// for bmRequestType == 0
#define CLEAR_FEATURE 0x01
#define SET_FEATURE 0x03 // unused
#define SET_ADDRESS 0x05
#define SET_DESCRIPTOR 0x07 // unused
#define SET_CONFIGURATION 0x09
// for bmRequestType == 0x81, 1 or 0xB2
#define GET_INTERFACE 0x0A // unused
#define SET_INTERFACE 0x0B // unused
#define SYNC_FRAME 0x0C // unused
#define VENDOR_REQUEST 0x01 // unused
// Class-Specific Control Requests
#define SEND_ENCAPSULATED_COMMAND 0x00 // unused
#define GET_ENCAPSULATED_RESPONSE 0x01 // unused
#define SET_COMM_FEATURE 0x02 // unused
#define GET_COMM_FEATURE 0x03 // unused
#define CLEAR_COMM_FEATURE 0x04 // unused
#define SET_LINE_CODING 0x20
#define GET_LINE_CODING 0x21
#define SET_CONTROL_LINE_STATE 0x22
#define SEND_BREAK 0x23
// control line states
#define CONTROL_DTR 0x01
#define CONTROL_RTS 0x02
// string descriptors
enum{
iLANGUAGE_DESCR,
iMANUFACTURER_DESCR,
iPRODUCT_DESCR,
iSERIAL_DESCR,
iINTERFACE_DESCR,
iDESCR_AMOUNT
};
// Types of descriptors
#define DEVICE_DESCRIPTOR 0x01
#define CONFIGURATION_DESCRIPTOR 0x02
#define STRING_DESCRIPTOR 0x03
#define DEVICE_QUALIFIER_DESCRIPTOR 0x06
#define RX_FLAG(epstat) (epstat & USB_EPnR_CTR_RX)
#define TX_FLAG(epstat) (epstat & USB_EPnR_CTR_TX)
#define SETUP_FLAG(epstat) (epstat & USB_EPnR_SETUP)
// EPnR bits manipulation
#define KEEP_DTOG_STAT(EPnR) (EPnR & ~(USB_EPnR_STAT_RX|USB_EPnR_STAT_TX|USB_EPnR_DTOG_RX|USB_EPnR_DTOG_TX))
#define KEEP_DTOG(EPnR) (EPnR & ~(USB_EPnR_DTOG_RX|USB_EPnR_DTOG_TX))
// EP types
#define EP_TYPE_BULK 0x00
#define EP_TYPE_CONTROL 0x01
#define EP_TYPE_ISO 0x02
#define EP_TYPE_INTERRUPT 0x03
#define LANG_US (uint16_t)0x0409
#define _USB_STRING_(name, str) \
static const struct name \
{ \
uint8_t bLength; \
uint8_t bDescriptorType; \
uint16_t bString[(sizeof(str) - 2) / 2]; \
\
} \
name = {sizeof(name), 0x03, str}
#define _USB_LANG_ID_(name, lng_id) \
\
static const struct name \
{ \
uint8_t bLength; \
uint8_t bDescriptorType; \
uint16_t bString; \
\
} \
name = {0x04, 0x03, lng_id}
// EP0 configuration packet
typedef struct {
uint8_t bmRequestType;
uint8_t bRequest;
uint16_t wValue;
uint16_t wIndex;
uint16_t wLength;
} config_pack_t;
// endpoints state
typedef struct{
uint16_t *tx_buf; // transmission buffer address
uint16_t txbufsz; // transmission buffer size
uint8_t *rx_buf; // reception buffer address
void (*func)(); // endpoint action function
unsigned rx_cnt : 10; // received data counter
} ep_t;
typedef struct {
uint32_t dwDTERate;
uint8_t bCharFormat;
#define USB_CDC_1_STOP_BITS 0
#define USB_CDC_1_5_STOP_BITS 1
#define USB_CDC_2_STOP_BITS 2
uint8_t bParityType;
#define USB_CDC_NO_PARITY 0
#define USB_CDC_ODD_PARITY 1
#define USB_CDC_EVEN_PARITY 2
#define USB_CDC_MARK_PARITY 3
#define USB_CDC_SPACE_PARITY 4
uint8_t bDataBits;
} __attribute__ ((packed)) usb_LineCoding;
typedef struct {
uint8_t bmRequestType;
uint8_t bNotificationType;
uint16_t wValue;
uint16_t wIndex;
uint16_t wLength;
} __attribute__ ((packed)) usb_cdc_notification;
extern ep_t endpoints[];
extern volatile uint8_t usbON;
extern uint8_t ep0databuf[], setupdatabuf[];
void EP0_Handler();
void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size);
void EP_Write(uint8_t number, const uint8_t *buf, uint16_t size);
int EP_Read(uint8_t number, uint8_t *buf);
usb_LineCoding getLineCoding();
void linecoding_handler(usb_LineCoding *lc);
void clstate_handler(uint16_t val);
void break_handler();
void vendor_handler(config_pack_t *packet);

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "usb.h"
#include "usb_lib.h"
// here we suppose that all PIN settings done in hw_setup earlier
void USB_setup(){
NVIC_DisableIRQ(USB_LP_IRQn);
// remap USB LP & Wakeup interrupts to 75 and 76 - works only on pure F303
RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN; // enable tacting of SYSCFG
SYSCFG->CFGR1 |= SYSCFG_CFGR1_USB_IT_RMP;
RCC->APB1ENR |= RCC_APB1ENR_USBEN;
USB->CNTR = USB_CNTR_FRES; // Force USB Reset
for(uint32_t ctr = 0; ctr < 72000; ++ctr) nop(); // wait >1ms
USB->CNTR = 0;
USB->BTABLE = 0;
USB->DADDR = 0;
USB->ISTR = 0;
USB->CNTR = USB_CNTR_RESETM | USB_CNTR_WKUPM; // allow only wakeup & reset interrupts
NVIC_EnableIRQ(USB_LP_IRQn);
}
static uint16_t lastaddr = LASTADDR_DEFAULT;
/**
* Endpoint initialisation
* @param number - EP num (0...7)
* @param type - EP type (EP_TYPE_BULK, EP_TYPE_CONTROL, EP_TYPE_ISO, EP_TYPE_INTERRUPT)
* @param txsz - transmission buffer size @ USB/CAN buffer
* @param rxsz - reception buffer size @ USB/CAN buffer
* @param uint16_t (*func)(ep_t *ep) - EP handler function
* @return 0 if all OK
*/
int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*func)(ep_t ep)){
if(number >= STM32ENDPOINTS) return 4; // out of configured amount
if(txsz > USB_BTABLE_SIZE || rxsz > USB_BTABLE_SIZE) return 1; // buffer too large
if(lastaddr + txsz + rxsz >= USB_BTABLE_SIZE) return 2; // out of btable
USB->EPnR[number] = (type << 9) | (number & USB_EPnR_EA);
USB->EPnR[number] ^= USB_EPnR_STAT_RX | USB_EPnR_STAT_TX_1;
if(rxsz & 1 || rxsz > 512) return 3; // wrong rx buffer size
uint16_t countrx = 0;
if(rxsz < 64) countrx = rxsz / 2;
else{
if(rxsz & 0x1f) return 3; // should be multiple of 32
countrx = 31 + rxsz / 32;
}
USB_BTABLE->EP[number].USB_ADDR_TX = lastaddr;
endpoints[number].tx_buf = (uint16_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
endpoints[number].txbufsz = txsz;
lastaddr += txsz;
USB_BTABLE->EP[number].USB_COUNT_TX = 0;
USB_BTABLE->EP[number].USB_ADDR_RX = lastaddr;
endpoints[number].rx_buf = (uint8_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
lastaddr += rxsz;
USB_BTABLE->EP[number].USB_COUNT_RX = countrx << 10;
endpoints[number].func = func;
return 0;
}
// standard IRQ handler
void usb_lp_isr(){
if(USB->ISTR & USB_ISTR_RESET){
usbON = 0;
// Reinit registers
USB->CNTR = USB_CNTR_RESETM | USB_CNTR_CTRM | USB_CNTR_SUSPM | USB_CNTR_WKUPM;
// Endpoint 0 - CONTROL
// ON USB LS size of EP0 may be 8 bytes, but on FS it should be 64 bytes!
lastaddr = LASTADDR_DEFAULT;
// clear address, leave only enable bit
USB->DADDR = USB_DADDR_EF;
if(EP_Init(0, EP_TYPE_CONTROL, USB_EP0_BUFSZ, USB_EP0_BUFSZ, EP0_Handler)){
return;
}
USB->ISTR = ~USB_ISTR_RESET;
}
if(USB->ISTR & USB_ISTR_CTR){
// EP number
uint8_t n = USB->ISTR & USB_ISTR_EPID;
// copy status register
uint16_t epstatus = USB->EPnR[n];
// copy received bytes amount
endpoints[n].rx_cnt = USB_BTABLE->EP[n].USB_COUNT_RX & 0x3FF; // low 10 bits is counter
// check direction
if(USB->ISTR & USB_ISTR_DIR){ // OUT interrupt - receive data, CTR_RX==1 (if CTR_TX == 1 - two pending transactions: receive following by transmit)
if(n == 0){ // control endpoint
if(epstatus & USB_EPnR_SETUP){ // setup packet -> copy data to conf_pack
EP_Read(0, setupdatabuf);
// interrupt handler will be called later
}else if(epstatus & USB_EPnR_CTR_RX){ // data packet -> push received data to ep0databuf
EP_Read(0, ep0databuf);
}
}
}
// call EP handler
if(endpoints[n].func) endpoints[n].func(endpoints[n]);
}
if(USB->ISTR & USB_ISTR_SUSP){ // suspend -> still no connection, may sleep
usbON = 0;
USB->CNTR |= USB_CNTR_FSUSP | USB_CNTR_LP_MODE;
USB->ISTR = ~USB_ISTR_SUSP;
}
if(USB->ISTR & USB_ISTR_WKUP){ // wakeup
USB->CNTR &= ~(USB_CNTR_FSUSP | USB_CNTR_LP_MODE); // clear suspend flags
USB->ISTR = ~USB_ISTR_WKUP;
}
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
// max endpoints number
#define STM32ENDPOINTS 8
/**
* Buffers size definition
**/
#define USB_BTABLE_SIZE 768
// first 64 bytes of USB_BTABLE are registers!
//#define USB_EP0_BASEADDR 64
// for USB FS EP0 buffers are from 8 to 64 bytes long (64 for PL2303)
#define USB_EP0_BUFSZ 64
// USB transmit buffer size (64 for PL2303)
#define USB_TXBUFSZ 64
// USB receive buffer size (64 for PL2303)
#define USB_RXBUFSZ 64
// EP1 - interrupt - buffer size
#define USB_EP1BUFSZ 8
#define USB_BTABLE_BASE 0x40006000
#define USB ((USB_TypeDef *) USB_BASE)
#ifdef USB_BTABLE
#undef USB_BTABLE
#endif
#define USB_BTABLE ((USB_BtableDef *)(USB_BTABLE_BASE))
#define USB_ISTR_EPID 0x0000000F
#define USB_FNR_LSOF_0 0x00000800
#define USB_FNR_lSOF_1 0x00001000
#define USB_LPMCSR_BESL_0 0x00000010
#define USB_LPMCSR_BESL_1 0x00000020
#define USB_LPMCSR_BESL_2 0x00000040
#define USB_LPMCSR_BESL_3 0x00000080
#define USB_EPnR_CTR_RX 0x00008000
#define USB_EPnR_DTOG_RX 0x00004000
#define USB_EPnR_STAT_RX 0x00003000
#define USB_EPnR_STAT_RX_0 0x00001000
#define USB_EPnR_STAT_RX_1 0x00002000
#define USB_EPnR_SETUP 0x00000800
#define USB_EPnR_EP_TYPE 0x00000600
#define USB_EPnR_EP_TYPE_0 0x00000200
#define USB_EPnR_EP_TYPE_1 0x00000400
#define USB_EPnR_EP_KIND 0x00000100
#define USB_EPnR_CTR_TX 0x00000080
#define USB_EPnR_DTOG_TX 0x00000040
#define USB_EPnR_STAT_TX 0x00000030
#define USB_EPnR_STAT_TX_0 0x00000010
#define USB_EPnR_STAT_TX_1 0x00000020
#define USB_EPnR_EA 0x0000000F
#define USB_COUNTn_RX_BLSIZE 0x00008000
#define USB_COUNTn_NUM_BLOCK 0x00007C00
#define USB_COUNTn_RX 0x0000003F
#define USB_TypeDef USB_TypeDef_custom
typedef struct {
__IO uint32_t EPnR[STM32ENDPOINTS];
__IO uint32_t RESERVED[STM32ENDPOINTS];
__IO uint32_t CNTR;
__IO uint32_t ISTR;
__IO uint32_t FNR;
__IO uint32_t DADDR;
__IO uint32_t BTABLE;
} USB_TypeDef;
// F303 D/E have 2x16 access scheme
typedef struct{
#if defined USB2_16
__IO uint16_t USB_ADDR_TX;
__IO uint16_t USB_COUNT_TX;
__IO uint16_t USB_ADDR_RX;
__IO uint16_t USB_COUNT_RX;
#define ACCESSZ (1)
#define BUFTYPE uint8_t
#elif defined USB1_16
__IO uint32_t USB_ADDR_TX;
__IO uint32_t USB_COUNT_TX;
__IO uint32_t USB_ADDR_RX;
__IO uint32_t USB_COUNT_RX;
#define ACCESSZ (2)
#define BUFTYPE uint16_t
#else
#error "Define USB1_16 or USB2_16"
#endif
} USB_EPDATA_TypeDef;
typedef struct{
__IO USB_EPDATA_TypeDef EP[STM32ENDPOINTS];
} USB_BtableDef;
void USB_setup();
int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*func)());

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#define BUILD_NUMBER "2"
#define BUILD_DATE "2023-12-03"