void processTxState(softSerial_t *softSerial)
{
uint8_t mask;
if (!softSerial->isTransmittingData) {
char byteToSend;
if (isSoftSerialTransmitBufferEmpty((serialPort_t *)softSerial)) {
return;
}
// data to send
byteToSend = softSerial->port.txBuffer[softSerial->port.txBufferTail++];
if (softSerial->port.txBufferTail >= softSerial->port.txBufferSize) {
softSerial->port.txBufferTail = 0;
}
// build internal buffer, MSB = Stop Bit (1) + data bits (MSB to LSB) + start bit(0) LSB
softSerial->internalTxBuffer = (1 << (TX_TOTAL_BITS - 1)) | (byteToSend << 1);
softSerial->bitsLeftToTransmit = TX_TOTAL_BITS;
softSerial->isTransmittingData = true;
return;
}
if (softSerial->bitsLeftToTransmit) {
mask = softSerial->internalTxBuffer & 1;
softSerial->internalTxBuffer >>= 1;
setTxSignal(softSerial, mask);
softSerial->bitsLeftToTransmit--;
return;
}
void processTxState(softSerial_t *softSerial)
{
uint8_t mask;
if (!softSerial->isTransmittingData) {
if (isSoftSerialTransmitBufferEmpty((serialPort_t *)softSerial)) {
// Transmit buffer empty.
// Start listening if not already in if half-duplex
if (!softSerial->rxActive && softSerial->port.options & SERIAL_BIDIR) {
serialOutputPortDeActivate(softSerial);
serialInputPortActivate(softSerial);
}
return;
}
// data to send
uint8_t byteToSend = softSerial->port.txBuffer[softSerial->port.txBufferTail++];
if (softSerial->port.txBufferTail >= softSerial->port.txBufferSize) {
softSerial->port.txBufferTail = 0;
}
// build internal buffer, MSB = Stop Bit (1) + data bits (MSB to LSB) + start bit(0) LSB
softSerial->internalTxBuffer = (1 << (TX_TOTAL_BITS - 1)) | (byteToSend << 1);
softSerial->bitsLeftToTransmit = TX_TOTAL_BITS;
softSerial->isTransmittingData = true;
if (softSerial->rxActive && (softSerial->port.options & SERIAL_BIDIR)) {
// Half-duplex: Deactivate receiver, activate transmitter
serialInputPortDeActivate(softSerial);
serialOutputPortActivate(softSerial);
}
return;
}
if (softSerial->bitsLeftToTransmit) {
mask = softSerial->internalTxBuffer & 1;
softSerial->internalTxBuffer >>= 1;
setTxSignal(softSerial, mask);
softSerial->bitsLeftToTransmit--;
return;
}
void processTxState(softSerial_t *softSerial)
{
char mask;
if (!softSerial->isTransmittingData) {
char byteToSend;
if (isSoftSerialTransmitBufferEmpty((serialPort_t *)softSerial)) {
return;
}
// data to send
byteToSend = softSerial->port.txBuffer[softSerial->port.txBufferTail++];
if (softSerial->port.txBufferTail >= softSerial->port.txBufferSize) {
softSerial->port.txBufferTail = 0;
}
// build internal buffer, start bit(1) + data bits + stop bit(0)
softSerial->internalTxBuffer = (1 << (TX_TOTAL_BITS - 1)) | (byteToSend << 1);
softSerial->bitsLeftToTransmit = TX_TOTAL_BITS;
// start immediately
softSerial->timerTxCounter = 1;
softSerial->isTransmittingData = true;
return;
}
if (--softSerial->timerTxCounter <= 0) {
mask = softSerial->internalTxBuffer & 1;
softSerial->internalTxBuffer >>= 1;
setTxSignal(softSerial, mask);
softSerial->timerTxCounter = TICKS_PER_BIT;
if (--softSerial->bitsLeftToTransmit <= 0) {
softSerial->isTransmittingData = false;
}
}
