Reading string from uart

[Aashutosh3804]

How to read a string send over uart and store in array using getc method please help..
Not able to receive full string some bytes goes missing
Please provide a simple code please

[ildar]

You mean you lose data while transferred through UART?

[Aashutosh3804]

You mean you lose data while transferred through UART?

Yes, while receiving I use uart0_getc() function to read until a \0 or \r is in data and save in array but when I print array it stores sometimes multiple repeated string or sometimes missed characters
Can you just provide a simple function to read a string send over uart and store in array until a null is receive I am unable to do so
This library is awesome it helped me a lot please help if possible

[ildar]

Sorry, I'm not the author. But you may want to fix data loss problem which is the root I believe.

[Aashutosh3804]

Sorry, I'm not the author. But you may want to fix data loss problem which is the root I believe.

i used following code

void uart0_readBytes(char * rxd){

  uint16_t rx;
  uint8_t rx_status, rx_data;
  int i = 0;
  while(1){
    rx = uart0_getc();
       rx_status = (uint8_t)(rx >> 8);
          rx = rx << 8;
         rx_data = (uint8_t)(rx >> 8);

         if ((rx_status == 0) && (rx_data != '\0') && (rx_data != '\r')) {

           rxd[i] = rx_data;
           i++;
        } else {
          break;
        }

     }

   }
int main(void) {

    uart0_init(UART_BAUD_SELECT(115200, F_CPU));
    uart0_flush();



    while(1){

        uart0_readBytes(rxd);

                uart0_puts(rxd); 



    }

    return 0;   
}

[ildar]

I suggest that UART data loss may originate from the HW problems

[Aashutosh3804]

Thanks for info I will try

[andygock]

@Aashutosh3804

Unfortunately I don't have any samples, it's been a long time since I've used this or looked at the code, but quick look at your code.

• You should replace \r with \0 before performing uart0_puts(rxd) otherwise you will end up transmitting the \r together with whatever chars are after it

• Are you losing data because your strings are longer than the size of the circular Rx buffer? Or you're receiving data (possibly multiple strings in succession) into the Rx buffer faster than the rate you're able to transmit? Note that the *puts() functions will block your code if the Tx buffer is full.