mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 18:55:13 +03:00
402 lines
14 KiB
C
402 lines
14 KiB
C
/*
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* This file is part of the usbcanrb project.
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* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "can.h"
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#include "hardware.h"
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#include "proto.h"
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#include "usb.h"
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// circular buffer for received messages
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static CAN_message messages[CAN_INMESSAGE_SIZE];
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static uint8_t first_free_idx = 0; // index of first empty cell
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static int8_t first_nonfree_idx = -1; // index of first data cell
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uint32_t floodT = FLOOD_PERIOD_MS; // flood period in ms
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static uint8_t incrflood = 0; // ==1 for incremental flooding
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static uint32_t last_err_code = 0;
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static CAN_status can_status = CAN_STOP;
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static void can_process_fifo(uint8_t fifo_num);
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static CAN_message loc_flood_msg;
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static CAN_message *flood_msg = NULL; // == loc_flood_msg - to flood
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CAN_status CAN_get_status(){
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CAN_status st = can_status;
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// give overrun message only once
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#ifdef EBUG
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if(st == CAN_FIFO_OVERRUN) USB_sendstr("fifo 0 overrun\n");
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#endif
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if(st == CAN_FIFO_OVERRUN){
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USB_sendstr("FIFO overrun\n");
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can_status = CAN_READY;
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}
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return st;
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}
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// push next message into buffer; return 1 if buffer overfull
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static int CAN_messagebuf_push(CAN_message *msg){
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//MSG("Try to push\n");
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#ifdef EBUG
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USB_sendstr("push\n");
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#endif
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if(first_free_idx == first_nonfree_idx){
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#ifdef EBUG
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USB_sendstr("INBUF OVERFULL\n");
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#endif
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return 1; // no free space
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}
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if(first_nonfree_idx < 0) first_nonfree_idx = 0; // first message in empty buffer
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messages[first_free_idx++] = *msg;
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// need to roll?
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if(first_free_idx == CAN_INMESSAGE_SIZE) first_free_idx = 0;
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return 0;
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}
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// pop message from buffer
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CAN_message *CAN_messagebuf_pop(){
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if(first_nonfree_idx < 0) return NULL;
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#ifdef EBUG
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//MSG("read from idx "); printu(first_nonfree_idx); NL();
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#endif
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CAN_message *msg = &messages[first_nonfree_idx++];
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if(first_nonfree_idx == CAN_INMESSAGE_SIZE) first_nonfree_idx = 0;
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if(first_nonfree_idx == first_free_idx){ // buffer is empty - refresh it
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first_nonfree_idx = -1;
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first_free_idx = 0;
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}
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return msg;
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}
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int CAN_reinit(uint16_t speed){
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CAN->TSR |= CAN_TSR_ABRQ0 | CAN_TSR_ABRQ1 | CAN_TSR_ABRQ2;
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RCC->APB1RSTR |= RCC_APB1RSTR_CANRST;
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RCC->APB1RSTR &= ~RCC_APB1RSTR_CANRST;
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return CAN_setup(speed);
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}
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/*
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Can filtering: FSCx=0 (CAN->FS1R) -> 16-bit identifiers
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MASK: FBMx=0 (CAN->FM1R), two filters (n in FR1 and n+1 in FR2)
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ID: CAN->sFilterRegister[x].FRn[0..15]
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MASK: CAN->sFilterRegister[x].FRn[16..31]
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FR bits: STID[10:0] RTR IDE EXID[17:15]
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LIST: FBMx=1, four filters (n&n+1 in FR1, n+2&n+3 in FR2)
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IDn: CAN->sFilterRegister[x].FRn[0..15]
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IDn+1: CAN->sFilterRegister[x].FRn[16..31]
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*/
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/*
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Can timing: main freq - APB (PLL=48MHz)
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segment = 1sync + TBS1 + TBS2, sample point is between TBS1 and TBS2,
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so if TBS1=4 and TBS2=3, sum=8, bit sampling freq is 48/8 = 6MHz
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-> to get 100kbps we need prescaler=60
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250kbps - 24
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500kbps - 12
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1MBps - 6
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*/
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static uint16_t oldspeed = 100; // speed of last init
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uint16_t CAN_getspeed(){
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return oldspeed;
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}
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// speed - in kbps. @return - current speed
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int CAN_setup(uint16_t speed){
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LED_off(LED1);
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flood_msg = NULL; // clear for not flood in terminal
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incrflood = 0;
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if(speed == 0) speed = oldspeed;
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else if(speed < 50) speed = 50;
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else if(speed > 3000) speed = 3000;
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uint32_t regval = 6000/speed - 1;
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oldspeed = 6000 / (regval + 1); // new speed due to register value
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uint32_t tmout = 16000000;
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// Configure GPIO: PB8 - CAN_Rx, PB9 - CAN_Tx
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/* (1) Select AF mode (10) on PB8 and PB9 */
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/* (2) AF4 for CAN signals */
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GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER8 | GPIO_MODER_MODER9))
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| (GPIO_MODER_MODER8_AF | GPIO_MODER_MODER9_AF); /* (1) */
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GPIOB->AFR[1] = (GPIOB->AFR[1] &~ (GPIO_AFRH_AFRH0 | GPIO_AFRH_AFRH1))\
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| (4 << (0 * 4)) | (4 << (1 * 4)); /* (2) */
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/* Enable the peripheral clock CAN */
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RCC->APB1ENR |= RCC_APB1ENR_CANEN;
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/* Configure CAN */
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/* (1) Enter CAN init mode to write the configuration */
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/* (2) Wait the init mode entering */
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/* (3) Exit sleep mode */
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/* (4) Normal mode, set timing to 100kb/s: TBS1 = 4, TBS2 = 3, prescaler = 60 */
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/* (5) Leave init mode */
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/* (6) Wait the init mode leaving */
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/* (7) Enter filter init mode, (16-bit + mask, bank 0 for FIFO 0) */
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/* (8) Acivate filter 0 for two IDs */
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/* (9) Identifier list mode */
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/* (10) Set the Id list */
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/* (12) Leave filter init */
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/* (13) Set error interrupts enable */
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CAN->MCR |= CAN_MCR_INRQ; /* (1) */
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while((CAN->MSR & CAN_MSR_INAK)!=CAN_MSR_INAK) /* (2) */
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if(--tmout == 0) break;
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CAN->MCR &=~ CAN_MCR_SLEEP; /* (3) */
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CAN->MCR |= CAN_MCR_ABOM; /* allow automatically bus-off */
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CAN->BTR = 2 << 20 | 3 << 16 | regval; /* (4) */
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CAN->MCR &=~ CAN_MCR_INRQ; /* (5) */
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tmout = 16000000;
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while((CAN->MSR & CAN_MSR_INAK)==CAN_MSR_INAK) if(--tmout == 0) break; /* (6) */
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// accept ALL
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CAN->FMR = CAN_FMR_FINIT; /* (7) */
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CAN->FA1R = CAN_FA1R_FACT0 | CAN_FA1R_FACT1; /* (8) */
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// set to 1 all needed bits of CAN->FFA1R to switch given filters to FIFO1
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CAN->sFilterRegister[0].FR1 = (1<<21)|(1<<5); // all odd IDs
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CAN->FFA1R = 2; // filter 1 for FIFO1, filter 0 - for FIFO0
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CAN->sFilterRegister[1].FR1 = (1<<21); // all even IDs
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CAN->FMR &= ~CAN_FMR_FINIT; /* (12) */
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CAN->IER |= CAN_IER_ERRIE | CAN_IER_FOVIE0 | CAN_IER_FOVIE1; /* (13) */
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/* Configure IT */
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/* (14) Set priority for CAN_IRQn */
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/* (15) Enable CAN_IRQn */
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NVIC_SetPriority(CEC_CAN_IRQn, 0); /* (14) */
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NVIC_EnableIRQ(CEC_CAN_IRQn); /* (15) */
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can_status = CAN_READY;
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return speed;
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}
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void printCANerr(){
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if(!last_err_code) last_err_code = CAN->ESR;
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if(!last_err_code){
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USB_sendstr("No errors\n");
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return;
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}
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USB_sendstr("Receive error counter: ");
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printu((last_err_code & CAN_ESR_REC)>>24);
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USB_sendstr("\nTransmit error counter: ");
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printu((last_err_code & CAN_ESR_TEC)>>16);
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USB_sendstr("\nLast error code: ");
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int lec = (last_err_code & CAN_ESR_LEC) >> 4;
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const char *errmsg = "No";
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switch(lec){
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case 1: errmsg = "Stuff"; break;
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case 2: errmsg = "Form"; break;
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case 3: errmsg = "Ack"; break;
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case 4: errmsg = "Bit recessive"; break;
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case 5: errmsg = "Bit dominant"; break;
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case 6: errmsg = "CRC"; break;
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case 7: errmsg = "(set by software)"; break;
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}
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USB_sendstr(errmsg); USB_sendstr(" error\n");
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if(last_err_code & CAN_ESR_BOFF) USB_sendstr("Bus off ");
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if(last_err_code & CAN_ESR_EPVF) USB_sendstr("Passive error limit ");
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if(last_err_code & CAN_ESR_EWGF) USB_sendstr("Error counter limit");
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last_err_code = 0;
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USB_putbyte('\n');
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}
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void can_proc(){
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#ifdef EBUG
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if(last_err_code){
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USB_sendstr("Error, ESR=");
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printu(last_err_code);
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USB_putbyte('\n');
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last_err_code = 0;
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}
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#endif
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// check for messages in FIFO0 & FIFO1
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if(CAN->RF0R & CAN_RF0R_FMP0){
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can_process_fifo(0);
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}
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if(CAN->RF1R & CAN_RF1R_FMP1){
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can_process_fifo(1);
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}
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IWDG->KR = IWDG_REFRESH;
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if(CAN->ESR & (CAN_ESR_BOFF | CAN_ESR_EPVF | CAN_ESR_EWGF)){ // much errors - restart CAN BUS
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USB_sendstr("\nToo much errors, restarting CAN!\n");
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printCANerr();
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// request abort for all mailboxes
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CAN->TSR |= CAN_TSR_ABRQ0 | CAN_TSR_ABRQ1 | CAN_TSR_ABRQ2;
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// reset CAN bus
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RCC->APB1RSTR |= RCC_APB1RSTR_CANRST;
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RCC->APB1RSTR &= ~RCC_APB1RSTR_CANRST;
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CAN_setup(0);
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}
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static uint32_t lastFloodTime = 0;
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static uint32_t incrmessagectr = 0;
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if(flood_msg && (Tms - lastFloodTime) >= (floodT)){ // send message every floodT ms
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lastFloodTime = Tms;
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can_send(flood_msg->data, flood_msg->length, flood_msg->ID);
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}else if(incrflood && (Tms - lastFloodTime) >= floodT){ // incremental flood message
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lastFloodTime = Tms;
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if(CAN_OK == can_send((uint8_t*)&incrmessagectr, 4, loc_flood_msg.ID)) ++incrmessagectr;
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}
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}
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CAN_status can_send(uint8_t *msg, uint8_t len, uint16_t target_id){
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uint8_t mailbox = 0;
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// check first free mailbox
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if(CAN->TSR & (CAN_TSR_TME)){
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mailbox = (CAN->TSR & CAN_TSR_CODE) >> 24;
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}else{ // no free mailboxes
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#ifdef EBUG
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USB_sendstr("No free mailboxes\n");
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#endif
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return CAN_BUSY;
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}
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#ifdef EBUG
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USB_sendstr("Send data. Len="); printu(len);
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USB_sendstr(", tagid="); printuhex(target_id);
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USB_sendstr(", data=");
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for(int i = 0; i < len; ++i){
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USB_sendstr(" "); printuhex(msg[i]);
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}
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USB_putbyte('\n');
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#endif
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CAN_TxMailBox_TypeDef *box = &CAN->sTxMailBox[mailbox];
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uint32_t lb = 0, hb = 0;
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switch(len){
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case 8:
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hb |= (uint32_t)msg[7] << 24;
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__attribute__((fallthrough));
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case 7:
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hb |= (uint32_t)msg[6] << 16;
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__attribute__((fallthrough));
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case 6:
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hb |= (uint32_t)msg[5] << 8;
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__attribute__((fallthrough));
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case 5:
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hb |= (uint32_t)msg[4];
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__attribute__((fallthrough));
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case 4:
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lb |= (uint32_t)msg[3] << 24;
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__attribute__((fallthrough));
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case 3:
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lb |= (uint32_t)msg[2] << 16;
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__attribute__((fallthrough));
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case 2:
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lb |= (uint32_t)msg[1] << 8;
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__attribute__((fallthrough));
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default:
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lb |= (uint32_t)msg[0];
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}
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box->TDLR = lb;
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box->TDHR = hb;
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box->TDTR = len;
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box->TIR = (target_id & 0x7FF) << 21 | CAN_TI0R_TXRQ;
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return CAN_OK;
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}
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void set_flood(CAN_message *msg, int incr){
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if(incr){ incrflood = 1; return; }
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incrflood = 0;
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if(!msg) flood_msg = NULL;
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else{
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#ifdef EBUG
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USB_sendstr("flood msg: #");
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printuhex(msg->ID);
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for(uint8_t ctr = 0; ctr < msg->length; ++ctr){
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USB_putbyte(' ');
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printuhex(msg->data[ctr]);
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}
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USB_putbyte('\n');
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#endif
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// I meet strange problems with `loc_flood_msg = *msg` and system memcpy, so..
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loc_flood_msg.ID = msg->ID;
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loc_flood_msg.length = msg->length;
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*((uint32_t*)loc_flood_msg.data) = *((uint32_t*)msg->data);
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if(loc_flood_msg.length > 4)
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*((uint32_t*)&loc_flood_msg.data[4]) = *((uint32_t*)&msg->data[4]);
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flood_msg = &loc_flood_msg;
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}
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}
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static void can_process_fifo(uint8_t fifo_num){
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if(fifo_num > 1) return;
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LED_on(LED1); // Turn on LED1 - message received
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CAN_FIFOMailBox_TypeDef *box = &CAN->sFIFOMailBox[fifo_num];
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volatile uint32_t *RFxR = (fifo_num) ? &CAN->RF1R : &CAN->RF0R;
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#ifdef EBUG
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printu(*RFxR & CAN_RF0R_FMP0); USB_sendstr(" messages in FIFO\n");
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#endif
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// read all
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while(*RFxR & CAN_RF0R_FMP0){ // amount of messages pending
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// CAN_RDTxR: (16-31) - timestamp, (8-15) - filter match index, (0-3) - data length
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/* TODO: check filter match index if more than one ID can receive */
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CAN_message msg;
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uint8_t *dat = msg.data;
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uint8_t len = box->RDTR & 0x0f;
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msg.length = len;
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msg.ID = box->RIR >> 21;
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//msg.filterNo = (box->RDTR >> 8) & 0xff;
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//msg.fifoNum = fifo_num;
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if(len){ // message can be without data
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uint32_t hb = box->RDHR, lb = box->RDLR;
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switch(len){
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case 8:
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dat[7] = hb>>24;
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__attribute__((fallthrough));
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case 7:
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dat[6] = (hb>>16) & 0xff;
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__attribute__((fallthrough));
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case 6:
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dat[5] = (hb>>8) & 0xff;
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__attribute__((fallthrough));
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case 5:
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dat[4] = hb & 0xff;
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__attribute__((fallthrough));
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case 4:
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dat[3] = lb>>24;
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__attribute__((fallthrough));
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case 3:
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dat[2] = (lb>>16) & 0xff;
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__attribute__((fallthrough));
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case 2:
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dat[1] = (lb>>8) & 0xff;
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__attribute__((fallthrough));
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case 1:
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dat[0] = lb & 0xff;
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}
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}
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if(CAN_messagebuf_push(&msg)) return; // error: buffer is full, try later
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*RFxR = CAN_RF0R_RFOM0; // release fifo for access to next message
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}
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//if(*RFxR & CAN_RF0R_FULL0) *RFxR &= ~CAN_RF0R_FULL0;
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*RFxR = 0; // clear FOVR & FULL
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}
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void cec_can_isr(){
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if(CAN->RF0R & CAN_RF0R_FOVR0){ // FIFO overrun
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CAN->RF0R = CAN_RF0R_FOVR0;
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can_status = CAN_FIFO_OVERRUN;
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}
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if(CAN->RF1R & CAN_RF1R_FOVR1){
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CAN->RF1R = CAN_RF1R_FOVR1;
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can_status = CAN_FIFO_OVERRUN;
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}
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if(CAN->MSR & CAN_MSR_ERRI){ // Error
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CAN->MSR &= ~CAN_MSR_ERRI;
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// request abort for problem mailbox
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if(CAN->TSR & CAN_TSR_TERR0) CAN->TSR |= CAN_TSR_ABRQ0;
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if(CAN->TSR & CAN_TSR_TERR1) CAN->TSR |= CAN_TSR_ABRQ1;
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if(CAN->TSR & CAN_TSR_TERR2) CAN->TSR |= CAN_TSR_ABRQ2;
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#ifdef EBUG
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last_err_code = CAN->ESR;
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#endif
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}
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}
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