Does the XIAO support timer interrupts? If so, does anyone have a sample sketch for Arduino that demonstrates? I’m familiar with interrupts on the Uno, but my code fails to compile for the XIAO. Thanks.
You can try the API. I hope it meets your needs.
https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
Thank you, that is most helpful.
That doesn’t look like a timer interrupt to me it looks like an interrupt on a pin.
Yeah, you’re right, that is all about interrupt pins
You’ve probably found something by now, so I guess this is for the benefit of anyone else looking
#include <Arduino.h>
#include <TimerTC3.h>
#define Transmission_Timer TimerTc3
/****************
* Forward declarations of functions
*************************************************************/
void TRANSMISSION_ISR();
void transmit();
/****************
* Evaluated to determine whether or not we need to send a message
*************************************************************/
volatile bool TransmitNextMessage = false;
void setup()
{
Serial.begin(115200);
// allow time for serial start and port monitoring tool connection
uint32_t timestamp = millis();
while(millis() - timestamp < 2000)
;
/****************
* Initialize the timer and register the ISR function
*************************************************************/
Transmission_Timer.initialize(); // The default interval is 1000000 microseconds
Transmission_Timer.attachInterrupt(TRANSMISSION_ISR);
}
unsigned long packetnum = 1; // packet counter, we increment per xmission
void loop()
{
/****************
* Disable the IRQ so that we can safely access the shared resource
*************************************************************/
__disable_irq();
bool run = TransmitNextMessage;
if(run)
TransmitNextMessage = !TransmitNextMessage;
/****************
* Don't forget to reenable the IRQ
*************************************************************/
__enable_irq();
if(run)
transmit();
}
/****************
* The ISR must return as quickly as possible
*************************************************************/
void TRANSMISSION_ISR() { TransmitNextMessage = true; }
/****************
* This function is called each time the Timer period elapses
* but it happens as part of the main loop()
*
* Remember that you should NEVER write to Serial
* from within an ISR
*************************************************************/
void transmit()
{
Serial.printf("Hello World # %lu", packetnum++);
}
One of my teammates was working with an arduino mega while writing this code. now i have to use the Seeeduino XIAO, therefore the time interrupts isn’t working and i get compilation error. any suggestion ? (without too much change in the code)
hi this is Timer intterupt basic code
#include <TimerTC3.h>
void setup()
{
TimerTc3.initialize(1000000);
TimerTc3.attachInterrupt(timerIsr);
}
void loop()
{ }
void timerIsr()
{ /in your code }
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