timer interupt

[lmichalec]

Posted on July 10, 2007 at 11:24

timer interupt

[lmichalec]

Posted on May 17, 2011 at 09:45

I need timer interupt 1us. How I do it this?

[mgerkens9]

Posted on May 17, 2011 at 09:45

Hi,

if you set TIM0_OC2R = TIM0_OC1R = YOUR_VALUE you generate a 50% Duty-Cycle on your timer. (Route it on a Port Pin an you'll see it)

With YOUR_VALUE you'll setting up the time an irq occurs.

I work with this solution:

void init_timer_0 (void)

{

SCU_PRR1 |= 0x1; // Disable Reset from timer 0

SCU_PCGR1 |= 0x1; // Clock enabling to timer 0

TIM0_CR1 |= 0x40; // Enable Output Compare

TIM0_CR1 |= 0x10; // Enable PWM

TIM0_CR2 = 0x007f; // Set the prescaler to PCLK/256

TIM0_CR1 |= 0x100; // Outputlevel 1

TIM0_CR1 &=~ 0x200; // Outputlevel 2

TIM0_OC2R = 0xf5; // Set the Period of the signal (1ms @ 16MHz)

TIM0_OC1R = 0xf5; // Set the lenght of the Pulse (1ms @ 16MHz)

TIM0_CR2 |= 0x800; // Enable the Interrupt, when a match occurs

VIC0_VA4R = (unsigned int)irq_handler_timer0; // Set the address of the timer 0 ISR

VIC0_VC4R = 0x24; // Use slot 4 for timer 0 interrupt

VIC0_INTER |= 0x10; // Enable Timer 0 IRQ (Bit 4)

}

void irq_handler_timer0(void) // Generated by Timer 0

{

// your code here

VIC0_VAR = 0; // Acknowledge Interrupt VIC0

VIC1_VAR = 0; // Acknowledge Interrupt VIC1

TIM0_SR =0; // Delete the interrupt bit at the End of the irq-routine!!!

}