Interrupts

 Peripheral interrupt example1. Bind user-defined handler to USART0 RX interrupt.

    uint32_t num_bytes_received = 0;
    void UARTRxInt(uint32_t p){
        // p parameter is incoming symbol
        // Code just counts received bytes
        num_bytes_received++;
    }
    void setup(){
        Serial.begin(115200);
        // It's not evident, but Serial is binded to USART2 peripheral
        // Bind function
        zunoAttachSysHandler(ZUNO_HANDLER_IRQ, ZUNO_IRQVEC_USART2_RX, (void*) &UARTRxInt);
    }
    
    void loop(){
        if(num_bytes_received){
            Serial.print("RECEIVED:");
            Serial.print(num_bytes_received);
        }
        delay(1000);
    }
		
	

 Peripheral interrupt example2. GPT interrupt example.
    

volatile unsigned long count_gpt = 0;
void gpt_handler() {
    count_gpt++;
}
void setup() {
    Serial.begin(115200);
    // setup handler dynamically
    // GPT is maped to 32bit timer known as WTIMER
    zunoAttachSysHandler(ZUNO_HANDLER_IRQ, ZUNO_IRQVEC_WTIMER0, (void*) &gpt_handler);
    // setup GPT timer
    zunoGPTInit(ZUNO_GPT_SCALE1024|ZUNO_GPT_CYCLIC);	// divider and cyclic mode
    zunoGPTSet(10); // In 1024 tick units
    zunoGPTEnable(1); // start a timer    
}

void loop() {
    Serial0.print("Current GPT value:");
    Serial0.println(count_gpt);
    
    delay(1000);
}
            
        

 Static ISR definition. GPT interrupt handler example.

volatile unsigned long count_gpt = 0;
// special static macro-binding
ZUNO_SETUP_ISR_GPTIMER(gpt_handler);
void gpt_handler() {
    count_gpt++;
}
void setup() {
    Serial.begin(115200);
    // setup GPT timer
    zunoGPTInit(ZUNO_GPT_SCALE1024|ZUNO_GPT_CYCLIC);	// divider and cyclic mode
    zunoGPTSet(10); // In 1024 tick units
    zunoGPTEnable(1); // start a timer    
}
void loop() {
    Serial0.print("Current GPT value:");
    Serial0.println(count_gpt);
    delay(1000);
}