invalid conversion from 'void (*)()' to 'pico_timer_callback' {aka 'bool (*)(repeating_timer*)'}

[janczeresnia]

Hi I get an error compiling an example from your git website on Raspberry Pico Core 1.13.1 in Arduino I'm trying to use only Hardware Timer directly:

#include <RPi_Pico_TimerInterrupt.h>

#define TIMER_FREQ_HZ 8000.000
#define TIMER_INTERVAL_US 125

RPI_PICO_Timer ITimer1(1);

volatile uint32_t lastIsrMicros = 0;
volatile uint32_t deltaIsrMicros;

TimerHandler:

void TimerHandler() {
  deltaIsrMicros = micros() - lastIsrMicros;
  lastIsrMicros = micros();
}

• 1.2 Set Hardware Timer Interval and attach Timer Interrupt Handler function directly OR

  if (ITimer1.attachInterruptInterval(TIMER_INTERVAL_US, TimerHandler)) { <---- Error
  Serial.println("Starting ITimer OK, millis() = " + String(millis()));
  } else {
  Serial.println("Can't set ITimer. Select another freq. or timer");
  }

  Error : invalid conversion from 'void ()()' to 'pico_timer_callback' {aka 'bool ()(repeating_timer*)'} [-fpermissive]

• 1.3 Set Hardware Timer Frequency and attach Timer Interrupt Handler function.

if (ITimer1.setFrequency(TIMER_FREQ_HZ, TimerHandler)) { <---- Error
    Serial.println("Starting ITimer OK, millis() = " + String(millis()));
  } else {
    Serial.println("Can't set ITimer. Select another freq. or timer");
  }

Error : invalid conversion from 'void ()()' to 'pico_timer_callback' {aka 'bool ()(repeating_timer*)'} [-fpermissive]

And in loop

void loop() {
    Serial.println("delta: " + String(deltaIsrMicros));
    delay(1000);
}

I have fixed this error. Change TimerHandler to:

bool TimerHandler(struct repeating_timer *t) {
  deltaIsrMicros = micros() - lastIsrMicros;
  lastIsrMicros = micros();
  return true;
}

[khoih-prog]

Great that you can solve the problem by yourself. It's always better to recheck the working examples and compare to see what we're doing not correctly.