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Timer

Hi!!

I have a problem with timer. I have MCB2300 board with lpc2378.

In aplication I using RTL kernel, which use TIMER0.

Now I would like to have own timer TIMER3.
I set:


void timer3_irq (void) __irq {

    T3IR |= 0x08;

    LED_out(0x49);

    VICVectAddr = 0;
}


void timer_init(void)
{
    T3MR3  = 0x00003840; //set match channel 3 on 5ms
    T3MCR  = 0x600;      //Match register 3 enable

    //IRQ
    VICVectAddr27 = (unsigned long)timer3_irq;
    VICVectCntl27 = 4; //priority

    VICIntEnable |= 1<<27;

    //reset
    T3TCR = 0x00000003;

    //enable timer
    T3TCR = 0x00000001;
}

Have I set wrong?

Thanke for your help

Peter Kic

Parents

0 Martin GÃ¼nther over 17 years ago in reply to peter kic

Hello Peter Kic,

Please code it like below than it will work.

__irq void timer3_irq (void) {

  T3IR = 0x08;

  LED_Out(0x49);

  VICVectAddr = 0;
}


void timer_init(void)
{
    PCONP |= (1 << 23);    //enable power to TIM3

    T3MR3  = 0x00011999; //set match channel 3 on 1ms = 12000-1 at 12.0 MHz
    T3MCR  = 0x600;      //Match register 3 enable

    //IRQ
    VICVectAddr27 = (unsigned long)timer3_irq;
    VICVectCntl27 = 4; //priority

    VICIntEnable |= 1<<27;

    //reset
    T3TCR = 0x00000003;

    //enable timer
    T3TCR = 0x00000001;
}

If have tested it on a MCB2300.
Maybe the problem was that the __irq keyword was not at the beginning of the line.

Best Regards,
Martin Guenther

Reply

0 Martin GÃ¼nther over 17 years ago in reply to peter kic

Hello Peter Kic,

Please code it like below than it will work.

__irq void timer3_irq (void) {

  T3IR = 0x08;

  LED_Out(0x49);

  VICVectAddr = 0;
}


void timer_init(void)
{
    PCONP |= (1 << 23);    //enable power to TIM3

    T3MR3  = 0x00011999; //set match channel 3 on 1ms = 12000-1 at 12.0 MHz
    T3MCR  = 0x600;      //Match register 3 enable

    //IRQ
    VICVectAddr27 = (unsigned long)timer3_irq;
    VICVectCntl27 = 4; //priority

    VICIntEnable |= 1<<27;

    //reset
    T3TCR = 0x00000003;

    //enable timer
    T3TCR = 0x00000001;
}

If have tested it on a MCB2300.
Maybe the problem was that the __irq keyword was not at the beginning of the line.

Best Regards,
Martin Guenther

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