Hi,
I have two MCU communicating with each other via RS485. It's a very simple code one MCU send a data to other and the other is trying to receive this.
With MCU2 code everything is fine. It sends data like it should be.
Problem is with MCU1 code. When I delete #65 line in code (that one with HAL_UART_Transmit...) it works great. It receive data from MCU2 and starts engine and horn. But when I add this line it stop working. I dont understand why this is happening.
When the MCU2 works as a receiver everything is ok, but when I try to send something from it suddenly the whole uart stops working
MCU1 code:
/* USER CODE BEGIN 0 */
uint8_t buffer[2];
uint8_t ZERO[2]={0x00,0x00};
uint8_t AA[2]={0xAA,0xAA};
uint8_t BB[2]={0xBB,0xBB};
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if(buffer[0]==0xCC && buffer[1]==0xCC)
{
Engine(ON);
}
if(buffer[0]==0xDD && buffer[1]==0xDD)
{
Horn(ON);
}
HAL_UART_Receive_IT(&huart2, buffer, 2);
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
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_I2C1_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
transceiver(WRITE);
HAL_UART_Transmit(&huart2, ZERO, 2, 10);
transceiver(READ);
HAL_UART_Receive_IT(&huart2, buffer, 2);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
MCU2 code:
/* USER CODE BEGIN 0 */
uint8_t CC[2]={0xCC,0xCC};
uint8_t DD[2]={0xDD,0xDD};
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
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_USART1_UART_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
HAL_Delay(1000);
transceiver(WRITE);
HAL_UART_Transmit(&huart2, CC, 2, 10);
HAL_Delay(1000);
HAL_UART_Transmit(&huart2, DD, 2, 10);
transceiver(READ);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
