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This commit is contained in:
Edward Emelianov
2026-03-13 00:15:18 +03:00
parent b44fd9e91f
commit 14f544374a
9 changed files with 323 additions and 91 deletions
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74
F0:F030,F042,F072/usbcan_gpio/usart.c
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@@ -19,6 +19,7 @@
#include <stm32f0.h>
#include <string.h>
#include "flash.h"
#include "ringbuffer.h"
#include "usart.h"
@@ -43,40 +44,83 @@ static ringbuffer RBin = {.data = rbbuffer, .length = RXRBSZ};
static volatile USART_TypeDef* const Usarts[USARTSNO] = {USART1, USART2};
static uint8_t const UIRQs[USARTSNO] = {USART1_IRQn, USART2_IRQn};
static usartconf_t usartconfig;
static uint8_t usartconfig_notinited = 1;
#define CHKUSARTCONFIG() do{if(usartconfig_notinited) chkusartconf(NULL);}while(0)
// check config and if all OK, copy to local; if c == NULL, check local config and set defaults to wrong values
// return FALSE if some parameters was changed to default (in this case not copy to local)
int chkusartconf(usartconf_t *c){
int ret = TRUE;
if(usartconfig_notinited){
usartconfig = the_conf.usartconfig;
usartconfig_notinited = 0;
}
uint8_t copyto = TRUE;
if(!c){
copyto = FALSE;
c = &usartconfig;
}
if(c->speed < USART_MIN_SPEED || c->speed > USART_MAX_SPEED){
c->speed = USART_DEFAULT_SPEED;
ret = FALSE;
}
// another tests could be here (like stopbits etc, if you wish)
if(ret && copyto) usartconfig = *c;
return ret;
}
// just give default speed
void get_defusartconf(usartconf_t *c){
if(!c) return;
bzero(c, sizeof(usartconf_t));
c->speed = USART_DEFAULT_SPEED;
}
int get_curusartconf(usartconf_t *c){
CHKUSARTCONFIG();
if(!c) return FALSE;
*c = usartconfig;
return TRUE;
}
/**
* @brief usart_config - configure US[A]RT based on usb_LineCoding
* @param usartconf (io) - (modified to real speeds)
* @param usartconf (io) - (modified to real speeds); if NULL - get current
* @return TRUE if all OK
*/
int usart_config(usartconf_t *usartconf){
int usart_config(usartconf_t *uc){
CHKUSARTCONFIG();
if(uc && !chkusartconf(uc)) return FALSE;
if(0 == usartconfig.RXen && 0 == usartconfig.TXen){ // no Rx/Tx
usart_stop();
return FALSE;
}
SYSCFG->CFGR1 |= SYSCFG_CFGR1_USART1RX_DMA_RMP | SYSCFG_CFGR1_USART1TX_DMA_RMP; // both USARTs on DMA1ch4(tx)/5(rx)
// all clocking and GPIO config should be done in hardware_setup() & gpio_reinit()!
if(!usartconf) return FALSE;
if(curUSARTidx != -1) usart_stop(); // disable previous USART if enabled
uint8_t No = usartconf->No;
if(No >= USARTSNO || No < 1 || usartconf->speed < USART_MIN_SPEED) return FALSE;
--No; // now this is an INDEX!
uint8_t No = usartconfig.idx;
volatile USART_TypeDef *U = Usarts[No];
uint32_t peripheral_clock = 48000000;
// Disable USART while configuring
U->CR1 = 0;
U->ICR = 0xFFFFFFFF; // Clear all interrupt flags
// Assuming oversampling by 16 (default after reset). For higher baud rates you might use by 8.
U->BRR = peripheral_clock / (usartconf->speed);
usartconf->speed= peripheral_clock / U->BRR; // fix for real speed
U->BRR = peripheral_clock / (usartconfig.speed);
usartconfig.speed= peripheral_clock / U->BRR; // fix for real speed
uint32_t cr1 = 0;
// format: 8N1, so CR2 used only for character match (if need)
if(usartconf->monitor){
if(usartconf->textproto){
if(usartconfig.monitor){
if(usartconfig.textproto){
U->CR2 = USART_CR2_ADD_VAL('\n');
cr1 |= USART_CR1_CMIE;
}else cr1 |= USART_CR1_IDLEIE; // monitor binary data by IDLE flag
}
textformat = usartconf->textproto;
monitor = usartconf->monitor;
textformat = usartconfig.textproto;
monitor = usartconfig.monitor;
// Enable transmitter, receiver, and interrupts (optional)
if(usartconf->Rxen) cr1 |= USART_CR1_RE;
if(usartconf->Txen){
if(usartconfig.RXen) cr1 |= USART_CR1_RE;
if(usartconfig.TXen){
cr1 |= USART_CR1_TE;
// DMA Tx
volatile DMA_Channel_TypeDef *T = DMA1_Channel4;
@@ -87,6 +131,8 @@ int usart_config(usartconf_t *usartconf){
// Main config
U->CR1 = cr1;
curUSARTidx = No;
// all OK -> copy to global config
the_conf.usartconfig = usartconfig;
return TRUE;
}