Re: [avr-gcc-list] Converting string to uint32_t

[Andreas Höschler]

Hi all,

thanks for your responses that helped a lot to solve the problem:

The truncation is probably happening here--- utoa() takes an unsigned
int, which is 16 bits on this architecture. Try using ultoa() instead
and see if that helps. Compiling with the -Wconversion option turned on
might warn about this kind of situation.

The working set of methods:

uint32_t getLong_from_serial_rec_buffer()

  {

   char char_buffer[10];

   int i;

   for (i = 0 ; i < 10 ; i++)

     {

      if (bytes_in_serial_rec_buffer() > 0)

        {

         char current = buffer[buffer_tail];

         if (current >= '0' && current <= '9')

           {

            get_from_serial_rec_buffer(); // we already know the byte :-)

            char_buffer[i] = current;

           }

         else // is a comma or NULL or whatever other character

           {

            char_buffer[i] = 0;

            uint32_t ret = (uint32_t)strtoul(char_buffer, NULL, 0);

            return ret;

           }

        }

     } 

   return -1;   

  }

void putLong_in_serial_trans_buffer(uint32_t value)

{

   char char_buffer[10];

   ltoa(value, char_buffer, 10); 

   int i;

   for (i = 0 ; i < 10 ; i++)

    {

      char current = char_buffer[i];

      if (current != 0) TxByte (current);

      else break;

    }

}

Thanks,

 Andreas