void start_send(void) {
uint8_t txcrc = 0, i;
// atomically update flags
uint8_t sreg = SREG;
cli();
intercom_flags = (intercom_flags & ~FLAG_TX_FINISHED) | FLAG_TX_IN_PROGRESS;
SREG = sreg;
// set start byte
tx.packet.start = START;
// calculate CRC for outgoing packet
for (i = 0; i < (sizeof(intercom_packet_t) - 1); i++) {
txcrc ^= tx.data[i];
}
tx.packet.crc = txcrc;
for (i = 0; i < (sizeof(intercom_packet_t) ); i++) {
_tx.data[i] = tx.data[i];
}
// enable transmit pin
enable_transmit();
delay_us(15);
// actually start sending the packet
packet_pointer = 0;
#ifdef HOST
UCSR1B |= MASK(UDRIE1);
#else
UCSR0B |= MASK(UDRIE0);
#endif
}
void start_send(void) {
state = SEND_START1;
enable_transmit();
delay_us(15);
//Enable interrupts so we can send next characters
#ifdef HOST
UCSR1B |= MASK(UDRIE1);
#else
UCSR0B |= MASK(UDRIE0);
#endif
}
