I have an STM32F303K8T6 uC and I'm using the UART to transfer data to a PC. Now, when I unplug the Serial Interface while running, the whole program run into an error. How can I check in HAL, if the UART is available?
For Transmission I use the following function:
HAL_UART_Transmit_DMA(usart1, str,size);
Edit: I have here now the code for the UART1. The RxCallback function is never called, since it always runs into a Overrun error:
if(((isrflags & USART_ISR_ORE) != RESET) &&
(((cr1its & USART_CR1_RXNEIE) != RESET) || ((cr3its & USART_CR3_EIE) != RESET)))
{
__HAL_UART_CLEAR_IT(huart, UART_CLEAR_OREF);
huart->ErrorCode |= HAL_UART_ERROR_ORE;
}
Now here is the code of the initialization of the UART for RX:
main.c:
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f3xx_hal.h"
/* USER CODE BEGIN Includes */
#include "USART.h"
/* USER CODE END Includes */
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
DMA_HandleTypeDef hdma_usart1_tx;
char rx_buff[BUFFSIZE_RX];
char rx_data[BUFFSIZE_RX];
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART1_UART_Init(void);
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
/* USER CODE END PFP */
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
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_USART1_UART_Init();
/* USER CODE BEGIN 2 */
//UART
init_usart(&huart1);
//HAL_UART_Receive_IT(&huart1, (uint8_t *)buff_rx, USART_BUFFER_SIZE);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/** System Clock Configuration
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInit;
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = 16;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Configure the Systick interrupt time
*/
HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
/**Configure the Systick
*/
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
/* SysTick_IRQn interrupt configuration */
HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
/* USART1 init function */
static void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 57600;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel4_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel4_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel4_IRQn);
}
/** Pinout Configuration
*/
static void MX_GPIO_Init(void)
{
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
}
/* USER CODE BEGIN 4 */
///////////////////////CALLBACK//////////////////////////////////////////////////////////////////////////////////
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
}
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) {
}
///////////////////////END_CALLBACK//////////////////////////////////////////////////////////////////////////////
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
void _Error_Handler(char * file, int line)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
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.
* @param file: pointer to the source file name
* @param 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
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
UART.c:
#include <USART.h>
#include "stdlib.h"
extern rx_buff[BUFFSIZE_RX];
extern rx_data[BUFFSIZE_RX];
/*
* Variables to adjust via USART RX
*/
char *key;
char *s1;
char *s2;
uint8_t buff[36];
float val;
//////////////////////////////////////////////////
//////////////////////////////////////////////////
void init_usart(UART_HandleTypeDef *u) {
usart_handler=u;
__HAL_UART_ENABLE_IT(usart_handler,UART_IT_RXNE);
//HAL_UART_Receive_DMA(u, &rx_data, BUFFSIZE_RX);
}
void usart_tx(UART_HandleTypeDef *usart1, uint16_t bufferSize, char *str) {
int size=0;
char *p_str=str;
for(uint16_t i=0;i<bufferSize;i++) {
if(*p_str) {
size++;
p_str++;
} else {
break;
}
}
HAL_UART_Transmit_DMA(usart1, str,size);
}
void clearBuffer(char *buff, int size) {
for(int i=0;i<size;i++) {
buff[i]='\0';
}
}
void copyValuesToBuff() {
sprintf(rx_buff,"%s\n",rx_data);
setCommand();
}
void setCommand() {
val=0;
key = strtok(rx_buff, "=.");
s1 = strtok(NULL, "=.");
s2 = strtok(NULL,"=.");
if(strcmp(s1,"")==0 || strcmp(s2,"")==0) {
} else {
sprintf(buff,"%s.%s",(char*)s1,(char*)s2); //only works if x.y, only x alone does not work!!!!
val=strtof(buff,NULL);
}
}
int strcmp(const char *s1, const char *s2)
{
const unsigned char *c1 = (const unsigned char *)s1;
const unsigned char *c2 = (const unsigned char *)s2;
unsigned char ch;
int d = 0;
while (1) {
d = (int)(ch = *c1++) - (int)*c2++;
if (d || !ch)
break;
}
return d;
}
Edit: How exactly can I see if an rx interrupt or a tx interrupt happened and how can I decide if it happened only because rx is floating? I tried the following, but it only works if the cable is connected:
void USART1_IRQHandler(void)
{
/* USER CODE BEGIN USART1_IRQn 0 */
uint8_t isRx = 0;
uint32_t it_rx=0;
uint32_t it_tx=0;
it_rx=USART1->ISR & UART_IT_RXNE;
it_tx=USART1->ISR & UART_IT_TXE;
if (it_tx!=0) {
isRx=1;
} else {
isRx=0;
}
/* USER CODE END USART1_IRQn 0 */
HAL_UART_IRQHandler(&huart1);
/* USER CODE BEGIN USART1_IRQn 1 */
if(isRx) {
uint8_t rbyte = huart1.Instance->RDR;
__HAL_UART_SEND_REQ(&huart1, UART_RXDATA_FLUSH_REQUEST);
rx_data[pointer]=rbyte;
if(rx_data[pointer]=='$') {
rx_data[pointer]='\0';
pointer=0;
copyValuesToBuff();
clearBuffer(&rx_data,BUFFSIZE_RX);
} else {
pointer++;
if(pointer>=BUFFSIZE_RX) {
pointer=0;
}
}
__HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE);
}
/* USER CODE END USART1_IRQn 1 */
}
