uint8_t IrTransceiver_Transmit(uint16_t *buffer, uint8_t length)
{
data_transmitted = 0;
if (timesCounter == 0) return IR_NO_DATA;
timesIndex = 1;
IR_COMPARE_REG = IR_COUNT_REG + times[0];
#if (IR_RX_ACTIVE_LOW == 1)
PORTC &= ~(1<<PC5);
#else
PORTC |= (1<<PC5);
#endif
IR_UNMASK_COMPARE();
while (!data_transmitted);
return IR_OK;
}
int IrTransceiver_Transmit(uint8_t channel, uint16_t *buffer, uint8_t start, uint8_t length, uint16_t modfreqkHz)
{
if (modfreqkHz == 0) {
/* Invalid frequency. */
return -1;
}
if (length == 0) {
/* No data. */
return -2;
}
if (drvIrTxChannel[channel].timeoutEnable == TRUE) {
/* Channel busy. */
return -3;
}
/* New modulation frequency. */
if (modfreqkHz != drvIrTxModFreqkHz) {
/* Check that no transmissions are ongoing. */
for (uint8_t i = 0; i < IR_SUPPORTED_NUM_CHANNELS; i++) {
/* Channel is waiting for an overflow. */
if (drvIrTxChannel[i].timeoutEnable == TRUE) {
/* Transmission active. */
return -4;
}
}
}
/* Update modulation frequency. */
drvIrTxModFreqkHz = modfreqkHz;
/* Start new transmission. */
drvIrTxChannel[channel].timeoutEnable = TRUE;
drvIrTxChannel[channel].txbuf = buffer;
drvIrTxChannel[channel].txlen = start + length;
/* first value will be loaded directly to timer below, therefore index is set to 1 here */
drvIrTxChannel[channel].txindex = 1 + start;
drvIrTxChannel[channel].timeout = IR_COUNT_REG + drvIrTxChannel[channel].txbuf[start];
/* go through all channels and find the one that have the next overflow */
uint8_t nextChannel = 0;
uint16_t timeRemaining = 0xffff;
uint16_t timeNow = IR_COMPARE_REG;
for (uint8_t i = 0; i < IR_SUPPORTED_NUM_CHANNELS; i++)
{
/* channel is not waiting for an overflow */
if (drvIrTxChannel[i].timeoutEnable == FALSE) continue;
if (drvIrTxChannel[i].timeout - timeNow < timeRemaining) // || (timeout - time > 0xffff-IR_MAX_PULSE_WIDTH)
{
timeRemaining = drvIrTxChannel[i].timeout - timeNow;
nextChannel = i;
}
}
/* set compare value to the channel that have the next overflow */
IR_COMPARE_REG = drvIrTxChannel[nextChannel].timeout;
/* set up modulation frequency */
IR_MODULATION_REG = (((F_CPU / 2000) / drvIrTxModFreqkHz) - 1);
/* Start send on pin */
IR_OUTP_HIGH();
/* enable overflow interrupt */
IR_UNMASK_COMPARE();
return 1;
}
