UART communication problem

[bakhti]

hi i'm trying to use the stm32H750 uart with Interrupt i managed to get it working but the message is a bit off ( alot ) here is a bit of the code

uint8_t tx_buff[]="                                                                      ";
uint8_t rx_buff[20];

  HAL_UART_Receive_IT(&huart1, &rx_buff[0], 20);

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){
n3=n3+5;
HAL_UART_Receive_IT(huart, &rx_buff[0], 20);
check = rx_buff[0];
if (check==67){
	n1=n1+100;
};
HAL_UART_Transmit_IT(&huart1, rx_buff, 21);
 
}

what i'm doing to try it , is that i'm monitoring via stmstudio and whenever a message arrive i'll rederect to the the host and read it again

here are the results

rx is coming back from mcu

[TDK]

See what it is directly after reset. That's probably the correct value. You could also check the datasheet and reference manual.

[Tesla DeLorean]

Ok, then try some simple echoing...

Like

while(1)
{
  if((USART1->ISR & USART_ISR_RXNE) == 0) // Wait for Char
  {
    if (USART1->ISR & USART_ISR_ORE) // Overrun Error
      USART1->ICR = USART_ICR_ORECF;
    if (USART1->ISR & USART_ISR_NE) // Noise Error
      USART1->ICR = USART_ICR_NCF;
    if (USART1->ISR & USART_ISR_FE) // Framing Error
      USART1->ICR = USART_ICR_FECF;
  }
  else // RXNE flagged
  {
    uint16_t data = USART1->RDR; // Read Char
    while((USART1->ISR & USART_ISR_TXE) == 0); // Wait for Empty
    USART1->TDR = data; // Send Char
  }
} // sourcer32@gmail.com