Handling UART receive

[mm.51]

I'm looking into creating a splashscreen and handling the uart responses. How can I wait for the input without consistently sending the response messaging. I'm unsure how to handle responses from the uart receive line.

enum splashscreen_response_type
{
  TEST_RESPONSE_VALID,
  TEST_RESPONSE_INVALID,
  TEST_RESPONSE_UNKNOWN,
  TEST_RESPONSE_MAX
};



int bootup_disp()
{
  int test_type_response = TEST_RESPONSE_UNKNOWN;
  char input[100];              // Buffer to hold the user input
  int processed_input;
  int chosen_test;
  int resp_buff[1];

   
  HAL_UART_Transmit(&hlpuart1,(uint8_t*)"USER CHOICE TYPE 1 for test:", sizeof("USER CHOICE TYPE 1 for test:"), 500);
  HAL_UART_Transmit(&hlpuart1,(uint8_t*)"TYPE USER CHOICE:", sizeof("TYPE USER CHOICE:"), 500);

  do{
      HAL_UART_Receive(&hlpuart1,splash_resp_buff, 1,500);
      
      if(resp_buff == 1)
      {
          HAL_UART_Transmit(&hlpuart1,(uint8_t*)"CORRECT CHOICE", sizeof("CORRECT CHOICE"), 500);
          test_type_response = TEST_RESPONSE_VALID);
          
      }
      else
      {
          HAL_UART_Transmit(&hlpuart1,(uint8_t*)"INCORRECT CHOICE", sizeof("INCORRECT CHOICE"), 500);
      }
  }
  while (test_type_response != TEST_RESPONSE_VALID);*/

  HAL_UART_Transmit(&hlpuart1,(uint8_t*)splash_resp_buff, sizeof(splash_resp_buff)-1, 500);

[Uwe Bonnes]

Your code accepts any input as valid and no user input as invalid. You should consider no user input as a NO-OP and not as a incorrect choice.

[mm.51]

What do you mean by NO-OP ? So are you saying I should accept no response as incorrect ? What would you recommend doing ?