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add SPI (not tested yet)

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This commit is contained in:
Edward Emelianov
2026-02-20 23:38:29 +03:00
parent 6c21d9f91a
commit 061fd8bec8
13 changed files with 167 additions and 8 deletions
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1
F3:F303/InterfaceBoard/Makefile
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@@ -3,6 +3,7 @@ BINARY := multiiface
MCU := F303xc
# change this linking script depending on particular MCU model,
LDSCRIPT := stm32f303xB.ld
# add define "-DSPIDMA" to use DMA for SSI encoder, in that case IF1 (USART3) would be interrupt-driven!
DEFINES := -DUSB1_16
include ../makefile.f3

2
F3:F303/InterfaceBoard/Readme.md
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@@ -104,7 +104,7 @@ Interfaces:
DMA1 channels:
- Ch2: USART3_Tx
- Ch2: USART3_Tx or SPI1_Rx
- Ch3: USART3_Rx
- Ch4: USART1_Tx
- Ch5: USART1_Rx

2
F3:F303/InterfaceBoard/hardware.c
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@@ -22,7 +22,7 @@ uint8_t Config_mode = 0;
static inline void gpio_setup(){
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN | RCC_AHBENR_GPIOCEN | RCC_AHBENR_GPIODEN
| RCC_AHBENR_DMA1EN | RCC_AHBENR_DMA2EN;
| RCC_AHBENR_DMA1EN | RCC_AHBENR_DMA2EN | RCC_APB2ENR_SPI1EN;
RCC->APB1ENR |= RCC_APB1ENR_CANEN | RCC_APB1ENR_USART2EN | RCC_APB1ENR_USART3EN
| RCC_APB1ENR_UART4EN | RCC_APB1ENR_UART5EN;
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;

14
F3:F303/InterfaceBoard/main.c
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@@ -22,6 +22,7 @@
#include "flash.h"
#include "hardware.h"
#include "proto.h"
#include "spi.h"
#include "strfunc.h"
#include "usart.h"
#include "usb_dev.h"
@@ -48,6 +49,7 @@ int main(void){
USBPU_OFF();
USB_setup();
CAN_setup(the_conf.CANspeed);
spi_setup();
//uint32_t ctr = Tms;
//usb_LineCoding lc = {9600, 0, 0, 8};
//for(int i = 0; i < 5; ++i) usart_config(i, &lc); // configure all U[S]ARTs for default data
@@ -63,13 +65,21 @@ int main(void){
int l = USB_receive(i, (uint8_t*)inbuff, MAXSTRLEN);
if(l) USB_send(i, (uint8_t*)inbuff, l);
}*/
if(CDCready[ICAN]){
if(CDCready[ICAN]){ // process CAN bus
int l = USB_receivestr(ICAN, inbuff, MAXSTRLEN);
if(l < 0) USB_sendstr(ICAN, "ERROR: USB buffer overflow or string was too long\n");
else if(l) CANcmd_parser(inbuff);
canproto_process();
}
if(CDCready[ISPI]){ // process encoder
if(USB_rcvlen(ISPI)){ // new data in USB - ask for new encoder data
if(spi_start_enc()) USB_receive(ISPI, (uint8_t*)inbuff, MAXSTRLEN); // clear incoming data
}
uint32_t val;
if(spi_read_enc(&val)){
USB_sendstr(ISPI, u2str(val));
}
}
if(Config_mode && CDCready[ICFG]){
/*if(Tms - ctr > 4999){
ctr = Tms;

BIN
F3:F303/InterfaceBoard/multiiface.bin
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Binary file not shown.

2
F3:F303/InterfaceBoard/multiiface.creator.user
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@@ -1,6 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE QtCreatorProject>
<!-- Written by QtCreator 18.0.2, 2026-02-19T23:09:57. -->
<!-- Written by QtCreator 18.0.2, 2026-02-20T23:37:53. -->
<qtcreator>
<data>
<variable>EnvironmentId</variable>

2
F3:F303/InterfaceBoard/multiiface.files
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@@ -13,6 +13,8 @@ proto.c
proto.h
ringbuffer.c
ringbuffer.h
spi.c
spi.h
strfunc.c
strfunc.h
usart.c

108
F3:F303/InterfaceBoard/spi.c Normal file
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@@ -0,0 +1,108 @@
/*
* This file is part of the multiiface project.
* Copyright 2026 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 "Debug.h"
#include "hardware.h"
#include "spi.h"
typedef enum{
SPI_NOTREADY,
SPI_IDLE,
SPI_READY,
#ifdef SPIDMA
SPI_BUSY
#endif
} spiStatus;
static spiStatus spi_status = SPI_NOTREADY;
static uint32_t spidata = 0;
#define WAITX(x) do{volatile uint32_t wctr = 0; while((x) && (++wctr < 360000)) IWDG->KR = IWDG_REFRESH; if(wctr==360000){ DBG("timeout"); return 0;}}while(0)
// init SPI to work with and without DMA
// DMA1Channel2 - SPI1 Rx
void spi_setup(){
SPI1->CR1 = 0; // clear EN
SPI1->CR2 = 0;
// SPI for SSI: PA5/PA6, without MOSI; suppose that clocking and GPIO OK (hardware.c)
RCC->APB2RSTR = RCC_APB2RSTR_SPI1RST; // reset SPI before start
RCC->APB2RSTR = 0; // clear reset
SPI1->CR1 = SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_RXONLY; // software slave management (without hardware NSS pin); RX only
#ifdef SPIDMA
// setup SPI DMA
SPI11->CR2 = SPI_CR2_RXDMAEN;
// Rx
DMA1_Channel2->CPAR = (uint32_t)&(SPI1->DR);
DMA1_Channel2->CCR = DMA_CCR_MINC | DMA_CCR_TCIE | DMA_CCR_TEIE; // mem inc, hw->mem, Rx complete and error interrupt
NVIC_EnableIRQ(DMA1_Channel2_IRQn); // enable Rx interrupt
#endif
// Master, baudrate = 0b110 - fpclk/128 (562.5 kHz)
SPI1->CR1 |= SPI_CR1_MSTR | SPI_CR1_BR_2 | SPI_CR1_BR_1;
// DS=8bit; RXNE generates after 8bit of data in FIFO;
SPI1->CR2 |= SPI_CR2_FRXTH | SPI_CR2_DS_2|SPI_CR2_DS_1|SPI_CR2_DS_0;
spi_status = SPI_IDLE;
DBG("SPI setup OK");
}
// return TRUE if data ready and change `encval`
int spi_read_enc(uint32_t *encval){
if(spi_status != SPI_READY) return FALSE;
spi_status = SPI_IDLE;
#ifndef SPIDMA
// clear SPI Rx FIFO
for(int i = 0; i < 4; ++i) (void) SPI1->DR;
SPI1->CR1 |= SPI_CR1_SPE;
uint8_t *data = (uint8_t*) &spidata;
for(uint32_t x = 0; x < ENCODERBYTES; ++x){
if(x == ENCODERBYTES - 1) SPI1->CR1 &= ~SPI_CR1_RXONLY; // clear RXonly bit to stop CLK generation after next byte
WAITX(!(SPI1->SR & SPI_SR_RXNE));
data[x] = *((volatile uint8_t*)&SPI1->DR);
}
SPI1->CR1 &= ~SPI_CR1_SPE;
SPI1->CR1 |= SPI_CR1_RXONLY; // and return RXonly bit
#endif
if(encval) *encval = spidata;
return TRUE;
}
#ifdef SPIDMA
// start encoder reading over DMA
// @return FALSE if SPI is busy
int spi_start_enc(){
if(spi_status == SPI_BUSY || spi_status == SPI_NOTREADY) return FALSE;
if(SPI1->SR & SPI_SR_BSY) return FALSE;
DMA1_Channel2->CMAR = (uint32_t) &spidata;
DMA1_Channel2->CNDTR = 4;
DMA1_Channel2->CCR |= DMA_CCR_EN;
SPI1->CR1 |= SPI_CR1_SPE;
spi_status = SPI_BUSY;
return TRUE;
}
// SSI got fresh data
void dma1_channel2_isr(){
SPI1->CR1 &= ~SPI_CR1_SPE;
spi_status = SPI_READY; // ready independent on errors or Rx ready
}
#else
int spi_start_enc(){ // simple stub
if(spi_status == SPI_NOTREADY) return FALSE;
spi_status = SPI_READY; // user asks to read data
return TRUE;
}
#endif

27
F3:F303/InterfaceBoard/spi.h Normal file
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@@ -0,0 +1,27 @@
/*
* This file is part of the multiiface project.
* Copyright 2026 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>
// amount of bytes to read from encoder
#define ENCODERBYTES 4
void spi_setup();
int spi_start_enc();
int spi_read_enc(uint32_t *encval);

6
F3:F303/InterfaceBoard/usart.c
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@@ -52,7 +52,11 @@ typedef struct {
// IF6[5]: (CAN)
// IF7[6]: (SPI)
static const USART_Config UC[USARTSNO] = {
#ifdef SPIDMA
[0] = {.instance = USART3, .pclk_freq = 36000000, .UIRQn = USART3_IRQn, .dma_controller = NULL, .DEport = GPIOB, .DEpin = 1<<14 },
#else
[0] = {.instance = USART3, .pclk_freq = 36000000, .UIRQn = USART3_IRQn, .DIRQn = DMA1_Channel2_IRQn, .dma_controller = DMA1, .dma_rx_channel = DMA1_Channel3, .dma_tx_channel = DMA1_Channel2, .TTCflag = DMA_ISR_TCIF2, .DEport = GPIOB, .DEpin = 1<<14 },
#endif
[1] = {.instance = USART1, .pclk_freq = 72000000, .UIRQn = USART1_IRQn, .DIRQn = DMA1_Channel4_IRQn, .dma_controller = DMA1, .dma_rx_channel = DMA1_Channel5, .dma_tx_channel = DMA1_Channel4, .TTCflag = DMA_ISR_TCIF4, .DEport = GPIOB, .DEpin = 1<<0 },
[2] = {.instance = USART2, .pclk_freq = 36000000, .UIRQn = USART2_IRQn, .DIRQn = DMA1_Channel7_IRQn, .dma_controller = DMA1, .dma_rx_channel = DMA1_Channel6, .dma_tx_channel = DMA1_Channel7, .TTCflag = DMA_ISR_TCIF7, .DEport = GPIOA, .DEpin = 1<<1 },
[3] = {.instance = UART4, .pclk_freq = 36000000, .UIRQn = UART4_IRQn, .DIRQn = DMA2_Channel5_IRQn, .dma_controller = DMA2, .dma_rx_channel = DMA2_Channel3, .dma_tx_channel = DMA2_Channel5, .TTCflag = DMA_ISR_TCIF5 },
@@ -410,7 +414,9 @@ void uart4_exti34_isr(){ usart_isr(3); }
void uart5_exti35_isr(){ usart_isr(4); }
// DMA Tx interrupts (to arm ready flag)
#ifndef SPIDMA
void dma1_channel2_isr(){ TXrdy[0] = 1; DMA1->IFCR = DMA_IFCR_CTCIF2; }
#endif
void dma1_channel4_isr(){ TXrdy[1] = 1; DMA1->IFCR = DMA_IFCR_CTCIF4; }
void dma1_channel7_isr(){ TXrdy[2] = 1; DMA1->IFCR = DMA_IFCR_CTCIF7; }
void dma2_channel5_isr(){ TXrdy[3] = 1; DMA2->IFCR = DMA_IFCR_CTCIF5; }

6
F3:F303/InterfaceBoard/usb_dev.c
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@@ -303,6 +303,10 @@ int USB_sendstr(uint8_t ifno, const char *string){
return USB_send(ifno, (const uint8_t*)string, len);
}
int USB_rcvlen(uint8_t ifno){
return RB_datalen((ringbuffer*)&rbin[ifno]);
}
/**
* @brief USB_receive - get binary data from receiving ring-buffer
* @param buf (i) - buffer for received data
@@ -336,7 +340,7 @@ int USB_receivestr(uint8_t ifno, char *buf, int len){
}
int l = RB_readto((ringbuffer*)&rbin[ifno], '\n', (uint8_t*)buf, len);
if(l < 1){
if(rbin[ifno].length == RB_datalen((ringbuffer*)&rbin[ifno])){ // buffer is full but no '\n' found
if(rbin[ifno].length >= RB_datalen((ringbuffer*)&rbin[ifno]) - 1){ // buffer is full but no '\n' found
while(1 != RB_clearbuf((ringbuffer*)&rbin[ifno]));
return -1;
}

1
F3:F303/InterfaceBoard/usb_dev.h
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@@ -61,6 +61,7 @@ int USB_send(uint8_t ifno, const uint8_t *buf, int len);
//int USB_adddata(uint8_t ifno, const uint8_t *buf, int len);
int USB_putbyte(uint8_t ifno, uint8_t byte);
int USB_sendstr(uint8_t ifno, const char *string);
int USB_rcvlen(uint8_t ifno);
int USB_receive(uint8_t ifno, uint8_t *buf, int len);
int USB_receivestr(uint8_t ifno, char *buf, int len);
uint8_t IFconfig(uint8_t ifno, usb_LineCoding *l);

4
F3:F303/InterfaceBoard/version.inc
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@@ -1,2 +1,2 @@
#define BUILD_NUMBER "151"
#define BUILD_DATE "2026-02-19"
#define BUILD_NUMBER "154"
#define BUILD_DATE "2026-02-20"