SatclockRS41/f_rtty.c

#include "f_rtty.h"

uint8_t start_bits;


rttyStates send_rtty(char *buffer)
{
  // Step through a supplied charater bit by bit (with each function call), and return
  // the current state (one, zero, end)
  static uint8_t nr_bit = 0;
  nr_bit++;

  //

  if (start_bits)
    {
      start_bits--;
      return rttyOne;
    }

  // Start bit.
  if (nr_bit == 1)
    return rttyZero;

  // Data bits
  if (nr_bit > 1 && nr_bit < (RTTY_7BIT ? 9 : 10))
    {
      if ((*(buffer) >> (nr_bit - 2)) & 0x01)
	return rttyOne;
      else
	return rttyZero;
    }

#ifdef RTTY_7BIT
  nr_bit++;
#endif

  // Stop Bit
  if (nr_bit == 10)
    return rttyOne;

#ifdef RTTY_USE_2_STOP_BITS
  if (nr_bit == 11)
    return rttyOne;
#endif

  nr_bit = 0;
  return rttyEnd;
}