mirror of
https://github.com/eddyem/stm32samples.git
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240 lines
8.1 KiB
C
240 lines
8.1 KiB
C
/*
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* usart.c
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*
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* Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, 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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "stm32f0.h"
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#include "hardware.h"
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#include "proto.h"
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#include "usart.h"
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#include "usb.h"
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#include <string.h>
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extern volatile uint32_t Tms;
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// USART tx DMA 1: DMA1_Channel2, 2: DMA1_Channel4, 3: DMA1_Channel7
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static DMA_Channel_TypeDef *USARTDMA[USARTNUM] = {
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DMA1_Channel2, DMA1_Channel4
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#ifdef USART3
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,DMA1_Channel7
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#endif
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};
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static USART_TypeDef *USARTs[USARTNUM] = {
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USART1, USART2
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#ifdef USART3
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,USART3
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#endif
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};
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static volatile int idatalen[USARTNUM][2] = {0}; // received data line length (including '\n')
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static volatile int odatalen[USARTNUM][2] = {0};
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volatile int linerdy[USARTNUM] = {0}, // received data ready
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dlen[USARTNUM] = {0}, // length of data (including '\n') in current buffer
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bufovr[USARTNUM] = {0}, // input buffer overfull
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txrdy[USARTNUM] = {1,1 // transmission done
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#ifdef USART3
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,1
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#endif
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}
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;
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int rbufno[USARTNUM] = {0}, tbufno[USARTNUM] = {0}; // current rbuf/tbuf numbers
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static char rbuf[USARTNUM][2][UARTBUFSZI], tbuf[USARTNUM][2][UARTBUFSZO]; // receive & transmit buffers
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static char *recvdata[USARTNUM] = {0};
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/**
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* return length of received data (without trailing zero
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* usartno: 1, 2 or 3
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*/
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int usart_getline(int usartno, char **line){
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--usartno;
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if(bufovr[usartno]){
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bufovr[usartno] = 0;
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linerdy[usartno] = 0;
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return 0;
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}
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*line = recvdata[usartno];
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linerdy[usartno] = 0;
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return dlen[usartno];
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}
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// transmit current tbuf for all USARTs and swap buffers
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void transmit_tbuf(){
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for(int usartno = 0; usartno < USARTNUM; ++usartno){
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uint32_t p = 1000000;
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while(!txrdy[usartno] && --p);
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if(!txrdy[usartno]) continue;
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register int l = odatalen[usartno][tbufno[usartno]];
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if(!l) continue;
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txrdy[usartno] = 0;
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odatalen[usartno][tbufno[usartno]] = 0;
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USARTDMA[usartno]->CCR &= ~DMA_CCR_EN;
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USARTDMA[usartno]->CMAR = (uint32_t) tbuf[usartno][tbufno[usartno]]; // mem
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USARTDMA[usartno]->CNDTR = l;
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USARTDMA[usartno]->CCR |= DMA_CCR_EN;
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tbufno[usartno] = !tbufno[usartno];
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}
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}
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void usart_putchar(int usartno, const char ch){
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--usartno;
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if(odatalen[usartno][tbufno[usartno]] == UARTBUFSZO) transmit_tbuf();
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tbuf[usartno][tbufno[usartno]][odatalen[usartno][tbufno[usartno]]++] = ch;
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}
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void usart_send(int usartno, const char *str){
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--usartno;
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while(*str){
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if(odatalen[usartno][tbufno[usartno]] == UARTBUFSZO) transmit_tbuf();
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tbuf[usartno][tbufno[usartno]][odatalen[usartno][tbufno[usartno]]++] = *str++;
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}
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}
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void usart_sendn(int usartno, const char *str, uint32_t L){
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--usartno;
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for(uint32_t i = 0; i < L; ++i){
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if(odatalen[usartno][tbufno[usartno]] == UARTBUFSZO) transmit_tbuf();
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tbuf[usartno][tbufno[usartno]][odatalen[usartno][tbufno[usartno]]++] = *str++;
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}
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}
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void newline(int usartno){
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usart_putchar(usartno, '\n');
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transmit_tbuf();
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}
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void usart_setup(){
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// USART1: Rx - PA10, Tx - PA9 (AF1)
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// USART2: Rx - PA3, Tx - PA2 (AF1)
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// USART3: Rx - PB11, Tx - PB10 (AF4)
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// setup pins:
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GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER2|GPIO_MODER_MODER3|GPIO_MODER_MODER9 | GPIO_MODER_MODER10)) |
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GPIO_MODER_MODER2_AF | GPIO_MODER_MODER3_AF | GPIO_MODER_MODER9_AF | GPIO_MODER_MODER10_AF;
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GPIOA->AFR[0] = (GPIOA->AFR[0] & ~(GPIO_AFRL_AFRL2 | GPIO_AFRL_AFRL3)) |
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1 << (2 * 4) | 1 << (3 * 4); // PA2,3
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GPIOA->AFR[1] = (GPIOA->AFR[1] & ~(GPIO_AFRH_AFRH1 | GPIO_AFRH_AFRH2)) |
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1 << (1 * 4) | 1 << (2 * 4); // PA9, PA10
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// clock
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RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
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RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
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RCC->AHBENR |= RCC_AHBENR_DMA1EN;
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#ifdef USART3
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GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER10 | GPIO_MODER_MODER11)) |
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GPIO_MODER_MODER10_AF | GPIO_MODER_MODER11_AF;
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GPIOB->AFR[1] = (GPIOB->AFR[1] & ~(GPIO_AFRH_AFRH2 | GPIO_AFRH_AFRH3)) |
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4 << (2 * 4) | 4 << (3 * 4); // PB10, PB11
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RCC->APB1ENR |= RCC_APB1ENR_USART3EN;
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#endif
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for(int i = 0; i < USARTNUM; ++i){
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USARTs[i]->ICR = 0xffffffff; // clear all flags
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// USARTX Tx DMA
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USARTDMA[i]->CCR &= ~DMA_CCR_EN;
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USARTDMA[i]->CPAR = (uint32_t) &USARTs[i]->TDR; // periph
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USARTDMA[i]->CCR |= DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE; // 8bit, mem++, mem->per, transcompl irq
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// setup usarts
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USARTs[i]->BRR = 480000 / 1152;
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USARTs[i]->CR3 = USART_CR3_DMAT; // enable DMA Tx
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USARTs[i]->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE | USART_CR1_RXNEIE; // 1start,8data,nstop; enable Rx,Tx,USART
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uint32_t tmout = 16000000;
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while(!(USARTs[i]->ISR & USART_ISR_TC)){if(--tmout == 0) break;} // polling idle frame Transmission
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USARTs[i]->ICR = 0xffffffff; // clear all flags again
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}
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NVIC_SetPriority(DMA1_Channel2_3_IRQn, 3);
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NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
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NVIC_SetPriority(USART1_IRQn, 0);
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NVIC_EnableIRQ(USART1_IRQn);
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NVIC_SetPriority(DMA1_Channel4_5_6_7_IRQn, 3);
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NVIC_EnableIRQ(DMA1_Channel4_5_6_7_IRQn);
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NVIC_SetPriority(USART2_IRQn, 0);
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NVIC_EnableIRQ(USART2_IRQn);
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#ifdef USART3
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NVIC_SetPriority(USART3_4_IRQn, 0);
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NVIC_EnableIRQ(USART3_4_IRQn);
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#endif
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}
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void usart_stop(){
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RCC->APB2ENR &= ~RCC_APB2ENR_USART1EN;
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RCC->APB1ENR &= ~RCC_APB1ENR_USART2EN;
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#ifdef USART3
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RCC->APB1ENR &= ~RCC_APB1ENR_USART3EN;
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#endif
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}
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static void usart_IRQ(int usartno){
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USART_TypeDef *USARTX = USARTs[usartno];
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//USND("USART"); USB_sendstr(u2str(usartno+1)); USND(" IRQ, ISR=");
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//USB_sendstr(uhex2str(USARTX->ISR)); USND("\n");
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#ifdef CHECK_TMOUT
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static uint32_t tmout[USARTNUM] = {0};
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#endif
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if(USARTX->ISR & USART_ISR_RXNE){ // RX not emty - receive next char
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#ifdef CHECK_TMOUT
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if(tmout[usartno] && Tms >= tmout[usartno]){ // set overflow flag
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bufovr[usartno] = 1;
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idatalen[usartno][rbufno[usartno]] = 0;
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}
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tmout[usartno] = Tms + TIMEOUT_MS;
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if(!tmout[usartno]) tmout[usartno] = 1; // prevent 0
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#endif
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// read RDR clears flag
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uint8_t rb = USARTX->RDR;
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//USND("RB="); USB_sendstr(uhex2str(rb)); USND("\n");
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if(idatalen[usartno][rbufno[usartno]] < UARTBUFSZI){ // put next char into buf
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rbuf[usartno][rbufno[usartno]][idatalen[usartno][rbufno[usartno]]++] = rb;
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if(rb == '\n'){ // got newline - line ready
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//USND("Newline\n");
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linerdy[usartno] = 1;
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dlen[usartno] = idatalen[usartno][rbufno[usartno]];
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recvdata[usartno] = rbuf[usartno][rbufno[usartno]];
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// prepare other buffer
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rbufno[usartno] = !rbufno[usartno];
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idatalen[usartno][rbufno[usartno]] = 0;
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#ifdef CHECK_TMOUT
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// clear timeout at line end
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tmout[usartno] = 0;
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#endif
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}
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}else{ // buffer overrun
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bufovr[usartno] = 1;
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idatalen[usartno][rbufno[usartno]] = 0;
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#ifdef CHECK_TMOUT
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tmout[usartno] = 0;
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#endif
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}
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}
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}
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void usart1_isr(){
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usart_IRQ(0);
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}
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void usart2_isr(){
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usart_IRQ(1);
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}
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// work with USART3 only @ boards that have it
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#ifdef USART3
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void usart3_4_isr(){
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usart_IRQ(2);
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}
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#endif
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