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This commit is contained in:
Edward Emelianov
2022-03-10 11:04:14 +03:00
parent 29560b7c0c
commit 733dbd75d2
1758 changed files with 14 additions and 26855 deletions
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F0:F030,F042,F072/Chiller/usart.c Normal file
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/*
* usart.c
*
* Copyright 2018 Edward V. Emelianov <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 "usart.h"
#include <string.h> // memcpy
extern volatile uint32_t Tms;
static int datalen[2] = {0,0}; // received data line length (including '\n')
uint8_t bufovr = 0; // input buffer overfull
static uint8_t linerdy = 0 // received data ready
,dlen = 0 // length of data in current buffer
,txrdy = 1 // transmission done
;
static int rbufno = 0; // current rbuf number
static char rbuf[2][UARTBUFSZ+1], tbuf[UARTBUFSZ]; // receive & transmit buffers
static char *recvdata = NULL;
static char trbuf[UARTBUFSZ+1]; // auxiliary buffer for data transmission
static int trbufidx = 0;
int put_char(char c){
if(trbufidx >= UARTBUFSZ - 1){
if(ALL_OK != usart1_sendbuf()) return 1;
}
trbuf[trbufidx++] = c;
return 0;
}
// write zero-terminated string
int put_string(const char *str){
while(*str){
if(put_char(*str++)) return 1; //error! shouldn't be!!!
}
return 0; // all OK
}
/**
* Fill trbuf with integer value
* @param N - integer value
* @return 1 if buffer overflow; oterwise return 0
*/
int put_int(int32_t N){
if(N < 0){
if(put_char('-')) return 1;
N = -N;
}
return put_uint((uint32_t) N);
}
int put_uint(uint32_t N){
char buf[10];
int L = 0;
if(N){
while(N){
buf[L++] = N % 10 + '0';
N /= 10;
}
while(L--) if(put_char(buf[L])) return 1;
}else if(put_char('0')) return 1;
return 0;
}
/**
* @brief usart1_sendbuf - send temporary transmission buffer (trbuf) over USART
* @return Tx status
*/
TXstatus usart1_sendbuf(){
int len = trbufidx;
trbufidx = 0;
if(len == 0) return ALL_OK;
else if(len > UARTBUFSZ) len = UARTBUFSZ;
return usart1_send(trbuf, len);
}
void USART1_config(){
/* Enable the peripheral clock of GPIOA */
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
/* GPIO configuration for USART1 signals */
/* (1) Select AF mode (10) on PA9 and PA10 */
/* (2) AF1 for USART1 signals */
GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER9|GPIO_MODER_MODER10))\
| (GPIO_MODER_MODER9_1 | GPIO_MODER_MODER10_1); /* (1) */
GPIOA->AFR[1] = (GPIOA->AFR[1] &~ (GPIO_AFRH_AFRH1 | GPIO_AFRH_AFRH2))\
| (1 << (1 * 4)) | (1 << (2 * 4)); /* (2) */
/* Enable the peripheral clock USART1 */
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
/* Configure USART1 */
/* (1) oversampling by 16, 115200 baud */
/* (2) 8 data bit, 1 start bit, 1 stop bit, no parity */
USART1->BRR = 480000 / 1152; /* (1) */
USART1->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE; /* (2) */
/* polling idle frame Transmission */
while(!(USART1->ISR & USART_ISR_TC)){}
USART1->ICR |= USART_ICR_TCCF; /* clear TC flag */
USART1->CR1 |= USART_CR1_RXNEIE; /* enable TC, TXE & RXNE interrupt */
RCC->AHBENR |= RCC_AHBENR_DMA1EN;
DMA1_Channel2->CPAR = (uint32_t) &(USART1->TDR); // periph
DMA1_Channel2->CMAR = (uint32_t) tbuf; // mem
DMA1_Channel2->CCR |= DMA_CCR_MINC | DMA_CCR_DIR | DMA_CCR_TCIE; // 8bit, mem++, mem->per, transcompl irq
USART1->CR3 = USART_CR3_DMAT;
NVIC_SetPriority(DMA1_Channel2_3_IRQn, 3);
NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
/* Configure IT */
/* (3) Set priority for USART1_IRQn */
/* (4) Enable USART1_IRQn */
NVIC_SetPriority(USART1_IRQn, 0); /* (3) */
NVIC_EnableIRQ(USART1_IRQn); /* (4) */
}
void usart1_isr(){
static uint8_t timeout = 1 // == 0 for human interface without timeout
,nctr = 0 // counter of '#' received
,incmd = 0 // ==1 - inside command
;
static uint32_t tmout = 0;
if(USART1->ISR & USART_ISR_RXNE){ // RX not emty - receive next char
// read RDR clears flag
uint8_t rb = USART1->RDR;
if(timeout && rb == '#'){ // chek '#' without timeout
if(++nctr == 4){ // "####" received - turn off timeout
timeout = 0;
nctr = 0;
datalen[rbufno] = 0; // reset all incoming data
incmd = 0;
return;
}
}else nctr = 0;
if(!incmd){
if(rb == '['){ // open command or reset previoud input
datalen[rbufno] = 0;
incmd = 1;
}
return;
}
if(timeout){ // check timeout only inside commands
if(tmout && Tms >= tmout){ // set overflow flag
bufovr = 1;
datalen[rbufno] = 0;
}else{
tmout = Tms + TIMEOUT_MS;
if(!tmout) tmout = 1; // prevent 0
}
}
switch(rb){
case '[':
datalen[rbufno] = 0;
tmout = 0;
break;
case ']': // close command - line ready!
dlen = datalen[rbufno];
if(dlen){
linerdy = 1;
incmd = 0;
recvdata = rbuf[rbufno];
rbuf[rbufno][dlen] = 0;
rbufno = !rbufno;
datalen[rbufno] = 0;
}
tmout = 0;
break;
case '\r':
case '\n':
case ' ':
case '\t':
return;
break;
default:
break;
}
if(datalen[rbufno] < UARTBUFSZ){ // put next char into buf
rbuf[rbufno][datalen[rbufno]++] = rb;
}else{ // buffer overrun
bufovr = 1;
datalen[rbufno] = 0;
incmd = 0;
tmout = 0;
}
}
}
void dma1_channel2_3_isr(){
if(DMA1->ISR & DMA_ISR_TCIF2){ // Tx
DMA1->IFCR |= DMA_IFCR_CTCIF2; // clear TC flag
txrdy = 1;
}
}
/**
* return length of received data (without trailing zero)
*/
int usart1_getline(char **line){
if(!linerdy) return 0;
linerdy = 0;
if(bufovr){
bufovr = 0;
return 0;
}
*line = recvdata;
return dlen;
}
/**
* @brief usart1_send send buffer `str` adding trailing '\n'
* @param str - string to send (without '\n' at end)
* @param len - its length or 0 to auto count
* @return
*/
TXstatus usart1_send(const char *str, int len){
if(!txrdy) return LINE_BUSY;
if(len > UARTBUFSZ - 1) return STR_TOO_LONG;
txrdy = 0;
if(len == 0){
const char *ptr = str;
while(*ptr++) ++len;
}
if(len == 0) return ALL_OK;
DMA1_Channel2->CCR &= ~DMA_CCR_EN;
memcpy(tbuf, str, len);
tbuf[len++] = '\n';
DMA1_Channel2->CNDTR = len;
DMA1_Channel2->CCR |= DMA_CCR_EN; // start transmission
return ALL_OK;
}
TXstatus usart1_send_blocking(const char *str, int len){
if(!txrdy) return LINE_BUSY;
if(len == 0){
const char *ptr = str;
while(*ptr++) ++len;
}
if(len == 0) return ALL_OK;
for(int i = 0; i < len; ++i){
USART1->TDR = *str++;
while(!(USART1->ISR & USART_ISR_TXE));
}
USART1->TDR = '\n';
while(!(USART1->ISR & USART_ISR_TC));
txrdy = 1;
return ALL_OK;
}
// read `buf` and get first integer `N` in it
// @return pointer to first non-number if all OK or NULL if first symbol isn't a space or number
char *getnum(const char *buf, int32_t *N){
char c;
int positive = -1;
int32_t val = 0;
//usart1_send_blocking(buf, 0);
while((c = *buf++)){
if(c == '\t' || c == ' '){
if(positive < 0) continue; // beginning spaces
else break; // spaces after number
}
if(c == '-'){
if(positive < 0){
positive = 0;
continue;
}else break; // there already was `-` or number
}
if(c < '0' || c > '9') break;
if(positive < 0) positive = 1;
val = val * 10 + (int32_t)(c - '0');
}
if(positive != -1){
if(positive == 0){
if(val == 0) return NULL; // single '-'
val = -val;
}
*N = val;
}else return NULL;
/* usart1_sendbuf();
put_uint(val);
put_char('\n');*/
return (char*)buf-1;
}