Exemple #1
0
int serial_send_disconnect_packet(int fd)
{
	uint8_t packet[SEND_PACKET_SIZE];
	
	memset(&packet[0], 0, sizeof(packet));
	
	packet[0] = 0x5A;
	packet[19] = 0x5A;
	
	return serial_send_packet(fd, &packet);
}
Exemple #2
0
int  soft_serial_transaction(void) {
  SSTD_t *trans = Transaction_table;
#else
int  soft_serial_transaction(int sstd_index) {
  SSTD_t *trans = &Transaction_table[sstd_index];
#endif
  cli();

  // signal to the target that we want to start a transaction
  serial_output();
  serial_low();
  _delay_us(SLAVE_INT_WIDTH_US);

#ifndef SERIAL_USE_MULTI_TRANSACTION
  // wait for the target response
  serial_input_with_pullup();
  _delay_us(SLAVE_INT_RESPONSE_TIME);

  // check if the target is present
  if (serial_read_pin()) {
    // target failed to pull the line low, assume not present
    serial_output();
    serial_high();
    *trans->status = TRANSACTION_NO_RESPONSE;
    sei();
    return TRANSACTION_NO_RESPONSE;
  }

#else
  // send transaction table index
  sync_send();
  _delay_sub_us(TID_SEND_ADJUST);
  serial_write_chunk(sstd_index, 4);
  serial_delay_half1();

  // wait for the target response (step1 low->high)
  serial_input_with_pullup();
  while( !serial_read_pin() ) {
      _delay_sub_us(2);
  }

  // check if the target is present (step2 high->low)
  for( int i = 0; serial_read_pin(); i++ ) {
      if (i > SLAVE_INT_ACK_WIDTH + 1) {
	  // slave failed to pull the line low, assume not present
	  serial_output();
	  serial_high();
	  *trans->status = TRANSACTION_NO_RESPONSE;
	  sei();
	  return TRANSACTION_NO_RESPONSE;
      }
      _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT);
  }
#endif

  // initiator recive phase
  // if the target is present syncronize with it
  if( trans->target2initiator_buffer_size > 0 ) {
      if (!serial_recive_packet((uint8_t *)trans->target2initiator_buffer,
				trans->target2initiator_buffer_size) ) {
	  serial_output();
	  serial_high();
	  *trans->status = TRANSACTION_DATA_ERROR;
	  sei();
	  return TRANSACTION_DATA_ERROR;
      }
   }

  // initiator switch to output
  change_reciver2sender();

  // initiator send phase
  if( trans->initiator2target_buffer_size > 0 ) {
      serial_send_packet((uint8_t *)trans->initiator2target_buffer,
			 trans->initiator2target_buffer_size);
  }

  // always, release the line when not in use
  sync_send();

  *trans->status = TRANSACTION_END;
  sei();
  return TRANSACTION_END;
}