virtual void onNotify(Observable&,ObservableEvent::E event,void *) {
if(event==ObservableEvent::USART_ReadyToTransmit && *_dataToSend) {
// send the next character and increment the pointer
_usart.send(*_dataToSend++);
// if we are now at the end of the string then disable further interrupts
// because we are done
if(*_dataToSend=='\0')
_usart.disableInterrupts(MyUsartInterrupt::TRANSMIT);
}
}
void onInterrupt(UsartEventType uet) {
if(uet==UsartEventType::EVENT_RECEIVE) {
// receive the next character
_buffer[_index++]=_usart.receive();
// if we've got the 5 characters then disable receiving interrupts
// and enable sending
if(_index==5) {
_index=0;
_usart.disableInterrupts(MyUsartInterrupt::RECEIVE);
_usart.enableInterrupts(MyUsartInterrupt::TRANSMIT);
}
}
else if(uet==UsartEventType::EVENT_READY_TO_TRANSMIT) {
// send the next character
_usart.send(_buffer[_index++]);
// if we've sent back all 5 then disable sending interrupts and go back
// to receiving again
if(_index==5) {
_index=0;
_usart.disableInterrupts(MyUsartInterrupt::TRANSMIT);
_usart.enableInterrupts(MyUsartInterrupt::RECEIVE);
}
}
}
void run() {
// we're using interrupts, set up the NVIC
Nvic::initialise();
// set the initial string pointer
_dataToSend="Hello World";
// register ourselves as an observer of the USART interrupts
_usart.insertObserver(*this);
// enable interrupts. this will cause an immediate ready-to-send interrupt
_usart.enableInterrupts(MyUsartInterrupt::TRANSMIT);
// finished
for(;;);
}
void run() {
/*
* We're using interrupts, set up the NVIC
*/
Nvic::initialise();
// register ourselves as an observer of the USART interrupts
_usart.UsartInterruptEventSender.insertSubscriber(
UsartInterruptEventSourceSlot::bind(this,&UsartReceiveInterruptsTest::onInterrupt)
);
// enable the receive interrupt. this will start the whole chain of events
_index=0;
_usart.enableInterrupts(MyUsartInterrupt::RECEIVE);
// it's all going on in the background now. wish us luck :)
for(;;);
}