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stm32samples/F0-nolib/F0_testbrd/usart.c
Edward Emelianov 348d3f4dca F0 testbrd: I2C, DAC
2021-07-02 23:11:53 +03:00

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/*
* usart.c
*
* Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include "stm32f0.h"
#include "hardware.h"
#include "proto.h"
#include "usart.h"
#include "usb.h"
#include <string.h>
extern volatile uint32_t Tms;
// USART tx DMA 1: DMA1_Channel2, 2: DMA1_Channel4, 3: DMA1_Channel7
static DMA_Channel_TypeDef *USARTDMA[USARTNUM] = {
DMA1_Channel2, DMA1_Channel4
#ifdef USART3
,DMA1_Channel7
#endif
};
static USART_TypeDef *USARTs[USARTNUM] = {
USART1, USART2
#ifdef USART3
,USART3
#endif
};
static volatile int idatalen[USARTNUM][2] = {0}; // received data line length (including '\n')
static volatile int odatalen[USARTNUM][2] = {0};
volatile int linerdy[USARTNUM] = {0}, // received data ready
dlen[USARTNUM] = {0}, // length of data (including '\n') in current buffer
bufovr[USARTNUM] = {0}, // input buffer overfull
txrdy[USARTNUM] = {1,1 // transmission done
#ifdef USART3
,1
#endif
}
;
int rbufno[USARTNUM] = {0}, tbufno[USARTNUM] = {0}; // current rbuf/tbuf numbers
static char rbuf[USARTNUM][2][UARTBUFSZI], tbuf[USARTNUM][2][UARTBUFSZO]; // receive & transmit buffers
static char *recvdata[USARTNUM] = {0};
/**
* return length of received data (without trailing zero
* usartno: 1, 2 or 3
*/
int usart_getline(int usartno, char **line){
--usartno;
if(bufovr[usartno]){
bufovr[usartno] = 0;
linerdy[usartno] = 0;
return 0;
}
*line = recvdata[usartno];
linerdy[usartno] = 0;
return dlen[usartno];
}
// transmit current tbuf for all USARTs and swap buffers
void transmit_tbuf(){
for(int usartno = 0; usartno < USARTNUM; ++usartno){
uint32_t p = 1000000;
while(!txrdy[usartno] && --p);
if(!txrdy[usartno]) continue;
register int l = odatalen[usartno][tbufno[usartno]];
if(!l) continue;
txrdy[usartno] = 0;
odatalen[usartno][tbufno[usartno]] = 0;
USARTDMA[usartno]->CCR &= ~DMA_CCR_EN;
USARTDMA[usartno]->CMAR = (uint32_t) tbuf[usartno][tbufno[usartno]]; // mem
USARTDMA[usartno]->CNDTR = l;
USARTDMA[usartno]->CCR |= DMA_CCR_EN;
tbufno[usartno] = !tbufno[usartno];
}
}
void usart_putchar(int usartno, const char ch){
--usartno;
if(odatalen[usartno][tbufno[usartno]] == UARTBUFSZO) transmit_tbuf();
tbuf[usartno][tbufno[usartno]][odatalen[usartno][tbufno[usartno]]++] = ch;
}
void usart_send(int usartno, const char *str){
--usartno;
while(*str){
if(odatalen[usartno][tbufno[usartno]] == UARTBUFSZO) transmit_tbuf();
tbuf[usartno][tbufno[usartno]][odatalen[usartno][tbufno[usartno]]++] = *str++;
}
}
void usart_sendn(int usartno, const char *str, uint32_t L){
--usartno;
for(uint32_t i = 0; i < L; ++i){
if(odatalen[usartno][tbufno[usartno]] == UARTBUFSZO) transmit_tbuf();
tbuf[usartno][tbufno[usartno]][odatalen[usartno][tbufno[usartno]]++] = *str++;
}
}
void newline(int usartno){
usart_putchar(usartno, '\n');
transmit_tbuf();
}
void usart_setup(){
// USART1: Rx - PA10, Tx - PA9 (AF1)
// USART2: Rx - PA3, Tx - PA2 (AF1)
// USART3: Rx - PB11, Tx - PB10 (AF4)
// setup pins:
GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER2|GPIO_MODER_MODER3|GPIO_MODER_MODER9 | GPIO_MODER_MODER10)) |
GPIO_MODER_MODER2_AF | GPIO_MODER_MODER3_AF | GPIO_MODER_MODER9_AF | GPIO_MODER_MODER10_AF;
GPIOA->AFR[0] = (GPIOA->AFR[0] & ~(GPIO_AFRL_AFRL2 | GPIO_AFRL_AFRL3)) |
1 << (2 * 4) | 1 << (3 * 4); // PA2,3
GPIOA->AFR[1] = (GPIOA->AFR[1] & ~(GPIO_AFRH_AFRH1 | GPIO_AFRH_AFRH2)) |
1 << (1 * 4) | 1 << (2 * 4); // PA9, PA10
// clock
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
#ifdef USART3
GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER10 | GPIO_MODER_MODER11)) |
GPIO_MODER_MODER10_AF | GPIO_MODER_MODER11_AF;
GPIOB->AFR[1] = (GPIOB->AFR[1] & ~(GPIO_AFRH_AFRH2 | GPIO_AFRH_AFRH3)) |
4 << (2 * 4) | 4 << (3 * 4); // PB10, PB11
RCC->APB1ENR |= RCC_APB1ENR_USART3EN;
#endif
for(int i = 0; i < USARTNUM; ++i){
USARTs[i]->ICR = 0xffffffff; // clear all flags
// USARTX Tx DMA
USARTDMA[i]->CPAR = (uint32_t) &USARTs[i]->TDR; // periph
USARTDMA[i]->CCR |= DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE; // 8bit, mem++, mem->per, transcompl irq
// setup usarts
USARTs[i]->BRR = 480000 / 1152;
USARTs[i]->CR3 = USART_CR3_DMAT; // enable DMA Tx
USARTs[i]->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(!(USARTs[i]->ISR & USART_ISR_TC)){if(--tmout == 0) break;} // polling idle frame Transmission
USARTs[i]->ICR = 0xffffffff; // clear all flags again
}
NVIC_SetPriority(DMA1_Channel2_3_IRQn, 3);
NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
NVIC_SetPriority(USART1_IRQn, 0);
NVIC_EnableIRQ(USART1_IRQn);
NVIC_SetPriority(DMA1_Channel4_5_6_7_IRQn, 3);
NVIC_EnableIRQ(DMA1_Channel4_5_6_7_IRQn);
NVIC_SetPriority(USART2_IRQn, 0);
NVIC_EnableIRQ(USART2_IRQn);
#ifdef USART3
NVIC_SetPriority(USART3_4_IRQn, 0);
NVIC_EnableIRQ(USART3_4_IRQn);
#endif
}
static void usart_IRQ(int usartno){
USART_TypeDef *USARTX = USARTs[usartno];
//USND("USART"); USB_sendstr(u2str(usartno+1)); USND(" IRQ, ISR=");
//USB_sendstr(uhex2str(USARTX->ISR)); USND("\n");
#ifdef CHECK_TMOUT
static uint32_t tmout[USARTNUM] = {0};
#endif
if(USARTX->ISR & USART_ISR_RXNE){ // RX not emty - receive next char
#ifdef CHECK_TMOUT
if(tmout[usartno] && Tms >= tmout[usartno]){ // set overflow flag
bufovr[usartno] = 1;
idatalen[usartno][rbufno[usartno]] = 0;
}
tmout[usartno] = Tms + TIMEOUT_MS;
if(!tmout[usartno]) tmout[usartno] = 1; // prevent 0
#endif
// read RDR clears flag
uint8_t rb = USARTX->RDR;
//USND("RB="); USB_sendstr(uhex2str(rb)); USND("\n");
if(idatalen[usartno][rbufno[usartno]] < UARTBUFSZI){ // put next char into buf
rbuf[usartno][rbufno[usartno]][idatalen[usartno][rbufno[usartno]]++] = rb;
if(rb == '\n'){ // got newline - line ready
//USND("Newline\n");
linerdy[usartno] = 1;
dlen[usartno] = idatalen[usartno][rbufno[usartno]];
recvdata[usartno] = rbuf[usartno][rbufno[usartno]];
// prepare other buffer
rbufno[usartno] = !rbufno[usartno];
idatalen[usartno][rbufno[usartno]] = 0;
#ifdef CHECK_TMOUT
// clear timeout at line end
tmout[usartno] = 0;
#endif
}
}else{ // buffer overrun
bufovr[usartno] = 1;
idatalen[usartno][rbufno[usartno]] = 0;
#ifdef CHECK_TMOUT
tmout[usartno] = 0;
#endif
}
}
}
void usart1_isr(){
usart_IRQ(0);
}
void usart2_isr(){
usart_IRQ(1);
}
// work with USART3 only @ boards that have it
#ifdef USART3
void usart3_4_isr(){
usart_IRQ(2);
}
#endif
// USART1
void dma1_channel2_3_isr(){
if(DMA1->ISR & DMA_ISR_TCIF2){ // Tx
DMA1->IFCR |= DMA_IFCR_CTCIF2; // clear TC flag
txrdy[0] = 1;
}
}
// USART2 + USART3
void dma1_channel4_5_isr(){
if(DMA1->ISR & DMA_ISR_TCIF4){ // Tx
DMA1->IFCR |= DMA_IFCR_CTCIF4; // clear TC flag
txrdy[1] = 1;
}
#ifdef USART3
if(DMA1->ISR & DMA_ISR_TCIF7){ // Tx
DMA1->IFCR |= DMA_IFCR_CTCIF7; // clear TC flag
txrdy[2] = 1;
}
#endif
}
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