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Update Wire peripheral handler #669

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Update Wire peripheral handler #669

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129 changes: 68 additions & 61 deletions libraries/Wire/Wire.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -217,67 +217,74 @@ void TwoWire::onRequest(void(*function)(void))
onRequestCallback = function;
}

void TwoWire::onService(void)
{
if ( sercom->isSlaveWIRE() )
{
if(sercom->isStopDetectedWIRE() ||
(sercom->isAddressMatch() && sercom->isRestartDetectedWIRE() && !sercom->isMasterReadOperationWIRE())) //Stop or Restart detected
{
sercom->prepareAckBitWIRE();
sercom->prepareCommandBitsWire(0x03);

//Calling onReceiveCallback, if exists
if(onReceiveCallback)
{
onReceiveCallback(available());
}

rxBuffer.clear();
}
else if(sercom->isAddressMatch()) //Address Match
{
sercom->prepareAckBitWIRE();
sercom->prepareCommandBitsWire(0x03);

if(sercom->isMasterReadOperationWIRE()) //Is a request ?
{
txBuffer.clear();

transmissionBegun = true;

//Calling onRequestCallback, if exists
if(onRequestCallback)
{
onRequestCallback();
}
}
}
else if(sercom->isDataReadyWIRE())
{
if (sercom->isMasterReadOperationWIRE())
{
uint8_t c = 0xff;

if( txBuffer.available() ) {
c = txBuffer.read_char();
}

transmissionBegun = sercom->sendDataSlaveWIRE(c);
} else { //Received data
if (rxBuffer.isFull()) {
sercom->prepareNackBitWIRE();
} else {
//Store data
rxBuffer.store_char(sercom->readDataWIRE());

sercom->prepareAckBitWIRE();
}

sercom->prepareCommandBitsWire(0x03);
}
}
}
void TwoWire::onService(void) {
if (sercom->isSlaveWIRE()) {
if (sercom->isAddressMatch()) { // address match interrupt
if (sercom->isMasterReadOperationWIRE()) { // the master is making a read request
sercom->prepareAckBitWIRE();
sercom->prepareCommandBitsWire(0x03);

txBuffer.clear();
transmissionBegun = true;

// call the onRequest callback to put bytes in the txBuffer
if(onRequestCallback) {
onRequestCallback();
}

while(!sercom->isStopDetectedWIRE()) { // write the bytes out to the master
if (sercom->isDataReadyWIRE()) {
uint8_t c = 0xff;
if (txBuffer.available()) {
c = txBuffer.read_char();
}

sercom->sendDataSlaveWIRE(c);
}
}

// done sending bytes, NACK to shut things down
sercom->prepareNackBitWIRE();
sercom->prepareCommandBitsWire(0x03);

} else if (!(sercom->isMasterReadOperationWIRE())) { // acknowledge master write request
sercom->prepareAckBitWIRE();
sercom->prepareCommandBitsWire(0x03);

while(!(sercom->isStopDetectedWIRE() || sercom->isRestartDetectedWIRE())) { // read bytes from the master
if(sercom->isDataReadyWIRE()) {
if (rxBuffer.isFull()) {
sercom->prepareNackBitWIRE();
sercom->prepareCommandBitsWire(0x03);
break;
} else {
rxBuffer.store_char(sercom->readDataWIRE());
sercom->prepareAckBitWIRE();
sercom->prepareCommandBitsWire(0x03);
}
}
}

if(sercom->isStopDetectedWIRE() || sercom->isRestartDetectedWIRE()) {
if (onReceiveCallback) {
onReceiveCallback(available());
}

rxBuffer.clear();
}

if(sercom->isStopDetectedWIRE()) {
sercom->prepareNackBitWIRE();
sercom->prepareCommandBitsWire(0x03);
}

} else {
// do nothing
}
} else {
// do nothing
}
}
}

#if WIRE_INTERFACES_COUNT > 0
Expand Down