Solved
Weird behavior of HAL_UARTEx_RxEventCallback()
Hi all,
I setup DMA normal mode, on RS485 port where I receive more or less 1 byte per second.
Also, I have DMA normal mode on a debug serial port.
I want to send back on rs485 the characters I receive on that port.
What I observe is that if I add the following printf(), that redirects output to debug UART, in HAL_UARTEx_RxEventCallback()
printf( "errCode=%i\r\n", retCode );
everyting works fine, with TeraTerm software, I can see the characters I input in RS485 window displayed correctly.
BUT, if I remove the printf(), when I press keys in rs485 window the cursor only moves one space to the right not showing any character.
Also, if I set a breakpoint at the begiining of HAL_UARTEx_RxEventCallback(), it only gets called once on the first character I type in rs485 putty window and the sending back of the character received is ok, but then on subsequent pressing of keys HAL_UARTEx_RxEventCallback() is never called and nothing is shown in TeraTerm window.
I'm using STM32G070RBTx, STM32CubeIDE v. 1.13.2, I can't figure out what is going on, please help.
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2023 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "adc.h"
#include "crc.h"
#include "dma.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
#include <string.h>
#include "Serials.h"
#include "SerialDebug.h"
#include "AGC.h"
#include "RingBuffer.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/**************************************
* Global variables *
**************************************/
/* The device number id */
uint8_t deviceNumber = 0;
/* The array of ADC1 channels converted values */
uint16_t ADC1Values[ADC1_NUMBER_OF_CHANNELS];
/* The error code from parse operation */
ParseErrorCode_t parseResult;
/* The command received via debug serial port */
ParsedCommand_t cmd;
/* Serial port inbound ring buffer */
RingBuffer_t debugSerialInboundBuffer;
/* Serial port outbound ring bufer */
RingBuffer_t debugSerialOutboundBuffer;
/* Debug serial port inbound data buffer for inbound RingBuffer */
unsigned char * debugSerialInboundData[debugSerialInboundBufferSize];
/* Debug serial port outbound data buffer for outbound ringbuffer */
unsigned char * debugSerialOutboundData[debugSerialOutboundBufferSize];
/* Debug serial port inbound data buffer entry */
unsigned char debugSerialInboundEntry[debugSerialInboundBufferEntrySize];
/* Debug serial port outbound data buffer entry */
unsigned char debugSerialOutboundEntry[debugSerialOutboundBufferEntrySize];
/* Inbound buffer lost messages count */
int debugSerialInboundLostMessagesCount = 0;
/* Outbound buffer lost messages count */
int debugSerialOutboundLostMessagesCount = 0;
extern uint8_t UART2_charRxBuffer;
/* ADC1 converted values */
uint16_t ADC1Values[ADC1_NUMBER_OF_CHANNELS];
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
/**
* @brief Retargets the C library printf function to the USART.
* None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART1 and Loop until the end of transmission */
HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, 0xFFFF);
return ch;
}
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
const uint8_t rs485SerialInboundBufferEntrySize = 255;
/* RS485 serial port inbound data buffer entry */
//unsigned char rs485SerialInboundEntry[rs485SerialInboundBufferEntrySize];
extern DMA_HandleTypeDef hdma_usart1_rx;
#define rs485SerialInboundBufferEntrySize 255
unsigned char rs485SerialInboundEntry[rs485SerialInboundBufferEntrySize];
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
int returnCode = 0;
/* Initialize debug serial inbound buffer */
ringBufferInit( &debugSerialInboundBuffer, debugSerialInboundData, debugSerialInboundBufferSize );
/* Initialize debug serial outbound buffer */
ringBufferInit( &debugSerialOutboundBuffer, debugSerialOutboundData, debugSerialOutboundBufferSize );
/* 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_TIM6_Init();
MX_ADC1_Init();
MX_TIM14_Init();
MX_USART1_UART_Init();
MX_CRC_Init();
MX_TIM3_Init();
/* USER CODE BEGIN 2 */
extern DMA_HandleTypeDef hdma_usart2_rx;
/* Start conversion of ADC1 channels values in DMA mode */
HAL_ADC_Start_DMA( &hadc1, (uint32_t *)ADC1Values, ADC1_NUMBER_OF_CHANNELS );
/* Start reception of characters from debug serial port in DMA mode */
HAL_UART_Receive_DMA( &huart2, &UART2_charRxBuffer, 1 );
/* Disable the half transfer complete of data in DMA interrupt mode */
__HAL_DMA_DISABLE_IT(&hdma_usart2_rx, DMA_IT_HT);
/* Enable the transfer complete of data in DMA interrupt mode */
__HAL_DMA_ENABLE_IT(&hdma_usart2_rx, DMA_IT_TC);
HAL_UARTEx_ReceiveToIdle_DMA( &huart1, rs485SerialInboundEntry, rs485SerialInboundBufferEntrySize );
/* Disable the half transfer complete of data in DMA interrupt mode */
__HAL_DMA_DISABLE_IT(&hdma_usart1_rx, DMA_IT_HT);
/* Enable the transfer complete of data in DMA interrupt mode */
__HAL_DMA_ENABLE_IT(&hdma_usart1_rx, DMA_IT_TC);
HAL_TIM_Base_Start_IT(&htim6);
HAL_TIM_Base_Start_IT(&htim3);
HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_2);
HAL_TIM_PWM_Start(&htim14, TIM_CHANNEL_1);
HAL_TIM_Base_Start(&htim14);
HAL_UART_MspInit(&huart1);
HAL_UART_MspInit(&huart2);
__HAL_RCC_CRC_CLK_ENABLE();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1) {
/* Manage incoming message on the RS485 serial port */
/* Manage outcoming message on the RS485 serial port */
/* Manage incoming message on the debug serial port */
if ( !ringBufferRead( &debugSerialInboundBuffer, debugSerialInboundEntry ) )
{
/* Parse the user command */
parseResult = parseDebugCommand( debugSerialInboundEntry, &cmd ); // check return code
/* Execute user command */
executeDebugCommand( &cmd );
}
/* Manage outcoming message on the debug serial port */
if ( !ringBufferRead( &debugSerialOutboundBuffer, debugSerialOutboundEntry ) )
{
/* Wait for previous transmission to complete */
while ( __HAL_UART_GET_FLAG(&huart2, UART_FLAG_TC) != SET ) {};
/* Send outbound message */
HAL_UART_Transmit_DMA( &huart2, debugSerialOutboundEntry, (uint16_t)strlen( (char *)debugSerialOutboundEntry ) );
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
int retCode = 0;
if (huart->Instance == USART1)
{
while ( __HAL_UART_GET_FLAG(&huart1, UART_FLAG_TC) != SET ) {};
/* Pull DE high to enable TX operation */
HAL_GPIO_WritePin (USART1_DE_GPIO_Port, USART1_DE_Pin, GPIO_PIN_SET);
sprintf( &rs485SerialInboundEntry[Size], "\r\n\0" );
retCode = HAL_UART_Transmit_DMA(&huart1, rs485SerialInboundEntry, strlen( rs485SerialInboundEntry ) );
printf( "errCode=%i\r\n", retCode );
/* Pull DE low to enable RX operation */
HAL_GPIO_WritePin (USART1_DE_GPIO_Port, USART1_DE_Pin, GPIO_PIN_RESET);
retCode = HAL_UARTEx_ReceiveToIdle_DMA( &huart1, rs485SerialInboundEntry, rs485SerialInboundBufferEntrySize );
/* Disable the half transfer complete of data in DMA interrupt mode */
__HAL_DMA_DISABLE_IT(&hdma_usart1_rx, DMA_IT_HT);
/* Enable the transfer complete of data in DMA interrupt mode */
__HAL_DMA_ENABLE_IT(&hdma_usart1_rx, DMA_IT_TC);
}
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV1;
RCC_OscInitStruct.PLL.PLLN = 8;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1) {
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* file: pointer to the source file name
* line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */