Fubarino (microchip pic32mx), Second timer interrupt is not firing

Question

volatile uint32_t counter_timer = 0;
void __USER_ISR myISR() {
 counter_timer++;
 clearIntFlag(_TIMER_3_IRQ);
}
 
void __USER_ISR myISR_timer_four() {
 clearIntFlag(_TIMER_4_IRQ);
 TMR4 = 0x16E3600;
 Serial.print("hi\n");
 if(PORTAbits.RA10 != 1){
 LATAbits.LATA10 = 1;
 }
 else{
 LATAbits.LATA10 = 0;
 }
}
 
void setup{
 
 T3CONbits.TCS = 0b0; // Timer Clock Source Select bit
 T3CONbits.TCKPS = 0b000; //0b111; // Timer Input Clock Prescale Select bits
 T3CONbits.ON = 0b1; //0;//0b1;
 asm("nop \n");
 T4CONbits.TCS = 0b0;
 T4CONbits.TCKPS = 0b000;
 T4CONbits.T32 = 0b1;
 TMR4 = 0x16E3600; // half of 48mHz.
 T4CONbits.ON = 0b1;
 
 setIntVector(_TIMER_3_VECTOR, myISR);
 setIntPriority(_TIMER_3_VECTOR, 4, 0);
 clearIntFlag(_TIMER_3_IRQ);
 setIntEnable(_TIMER_3_IRQ);
 
 setIntVector(_TIMER_4_VECTOR, myISR_timer_four);
 setIntPriority(_TIMER_4_VECTOR, 1, 0);
 clearIntFlag(_TIMER_4_IRQ);
 setIntEnable(_TIMER_4_IRQ);
 
 
 TRISAbits.TRISA10 = 0; // Fubarino onboard yellow led
}
 
void loop() {
delay(500);
Serial.println(counter_timer);
Serial.println(TMR4, DEC);
}

Hi,

i wanna use multiple interrupts, i got the information from a document i got from: Majenko Technologies. the interrupt bound to Timer3 works, this was the example code in the pdf. now i "assembled" a second interrupt bound to timer4, copy, paste and adapt, but that isn't working.

i can print the "content" of the timer4 register and it's running.

have i done something wrong? search engine didn't yield a answer.

Answer 1

The problem was that you need to combine the even and the next odd timer (see datasheet of the microchip pic you're using) to form a 32 bit timer.