Hello,
I have a problem with RTC and UART reception using the DMA.
I am currently working with the L476RG core board. The RTC clock is the LSE. The UART is configured in cyclic mode on the Rx PIN.
I have done a simple data logging and could check that the moment I use the UART transmission the RTC increases one second.
The following table shows how the difference between the times changes when using HAL_UART_transmit.
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "fatfs.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <string.h>
#include <stdbool.h>
#define RxBuff_SIZE 255
RTC_HandleTypeDef hrtc;
UART_HandleTypeDef huart4;
DMA_HandleTypeDef hdma_uart4_rx;
//! variables for RTC
char time_char[30] = {'\0'};
char date_char[30] = {'\0'};
//! Creation the structure to stock the RTC data
RTC_info_t RTC_info;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_RTC_Init(void);
static void MX_UART4_Init(void);
static void MX_SDMMC1_SD_Init(void);
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_USART2_UART_Init();
MX_RTC_Init();
MX_UART4_Init();
MX_SDMMC1_SD_Init();
MX_FATFS_Init();
/* USER CODE BEGIN 2 */
//! Start DMA on Screen port
if (HAL_OK != HAL_UARTEx_ReceiveToIdle_DMA(&huart4, RxBuff, RxBuff_SIZE))
{
Error_Handler();
}
//! Disable the half interrup of the UART4
__HAL_DMA_DISABLE_IT(&hdma_uart4_rx, DMA_IT_HT);
while (1)
{
rtc_get_time_normal(&RTC_info, &hrtc);
rtc_print(&RTC_info, date_char, time_char);
deb_print(date_char);
deb_print(time_char);
HAL_UART_Transmit_IT(&huart4, (uint8_t*)data, len_data);
HAL_Delay(2000);
}
}
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t size)
{
if (huart->Instance == UART4) // <-- UART designator should correspond to UART port used
{
char CRLF_char[64] = {'\0'};
if (detectCRLF((char *)RxBuff, CRLF_char, sizeof(CRLF_char)) != true)
{
// Error in the message received from the KIM module
__NOP();
}
else
{
// If the received value contains CR and LF
// We copy the value
setFlagRx(RxBuff);
}
// copy the RxBuff to MainBuff
memcpy(MainBuff, RxBuff, size);
// Clear RxBuffer and reset DMA
//deb_print((char *)RxBuff);
memset(RxBuff, 0, RxBuff_SIZE);
HAL_UARTEx_ReceiveToIdle_DMA(&huart4, RxBuff, RxBuff_SIZE);
__HAL_DMA_DISABLE_IT(&hdma_uart4_rx, DMA_IT_HT);
}
}
uint8_t rtc_get_time_normal(RTC_info_t *time_param, RTC_HandleTypeDef* hrtc)
{
/**
* This function allows to obtain the time in a normal
* format (human). The values are stored in a structure
* pointer
*/
uint8_t ack = false;
RTC_DateTypeDef gDate = { 0 };
RTC_TimeTypeDef gTime = { 0 };
__HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
if (HAL_RTC_WaitForSynchro(hrtc) != HAL_OK)
{
return false;
}
__HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
HAL_RTC_GetTime(hrtc, &gTime, RTC_FORMAT_BIN);
HAL_RTC_GetDate(hrtc, &gDate, RTC_FORMAT_BIN);
time_param->year = gDate.Year;
time_param->month = gDate.Month;
time_param->day = gDate.Date;
time_param->hour = gTime.Hours;
time_param->minute = gTime.Minutes;
time_param->second = gTime.Seconds;
return ack;
}
void rtc_print(RTC_info_t *time_param, char * date_char, char * time_char)
{
sprintf(date_char, "[RTC]-> Date %02d-%02d-%02d\r\n", time_param->day, time_param->month, time_param->year);
sprintf(time_char, "[RTC]-> Time %02d:%02d:%02d\r\n", time_param->hour, time_param->minute, time_param->second);
}When I use the UART_transmit my other module responds by sending +OK or other data("xxxxxxxxxxxx"). This data is received by the DMA.
How can I fix this? I have already made several tests, and I am sure that it is the UART with the DMA that alter the RTC.
Thaks.
