I have a Stm32f030k6 custom board and I'm using Keil uV5 IDE. The MCU is interfaced with wifi module over UART. But stm32 wasn't responding to the events sent by wifi module. After lot of testing I found that the UART interrupt is not occuring when standalone. But when I connected ST-link V2 connector to it just works fine. Even when the debugger is not powered through PC it works fine. But when I turn it on without debugger connection it just stucks.
Have a look at the UART Callback function below:
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
HAL_UART_Transmit(&huart1,(uint8_t*)"interrupt\n",sizeof("interrupt\n"),HAL_MAX_DELAY);
/* Set transmission flag: trasfer complete*/
UartReady = SET;
HAL_UART_Receive_IT(&huart1,&a,1);
temp=a;
if((!start_flag)&&(temp=='@'))//Start condition
{
start_flag =1;
rxBufIdx=0;
memset(rxBuf,0,sizeof(rxBuf));
memset(result,0,sizeof(result));
}
else if((temp=='&')&&(rxBufIdx!=0))// end condition
{
comand_received_flag=1;
start_flag=0;
rxBuf[rxBufIdx++]='\0';
//connected=1;
sprintf((char*)result, (char*)rxBuf,10);
HAL_UART_Transmit(&huart1,(uint8_t*)"Received\n",sizeof("Received\n"),HAL_MAX_DELAY);}
if(strcmp((const char*)result,"Connected")==0){
connected=1; HAL_UART_Transmit(&huart1,(uint8_t*)"Connected=1\n",sizeof("Connected=1\n"),HAL_MAX_DELAY);}
else if(result[0]=='A' ||result[0]=='B'){
Accident=1;HAL_UART_Transmit(&huart1,(uint8_t*)"Accident=1\n",sizeof("Accident=1\n"),HAL_MAX_DELAY);}
else if(result[0]=='N'){
Accident=0;HAL_UART_Transmit(&huart1,(uint8_t*)"Accident=0\n",sizeof("Accident=0\n"),HAL_MAX_DELAY);}
else if(start_flag)//push data into Buff
{
rxBuf[rxBufIdx++]=temp;
}
}
