Lpc2000

--- In lpc2000@yahoogroups.com, h s <h7242004@y...> wrote:
> Has any one been able to successfully run all 4-compare channels of 
timer0 simultaneously (in the match interrupt mode, while the main 
timer0 is free running)? 
> The mode of operations could be such that one match channel is 
reloaded at a period rate. The other channels may be started and 
stopped as needed.  
>  
> I am losing match interrupts. 

I am using the four match interrupts and two capture interrupts on 
the free-running timer 0 in a LPC2114.  It seems to work.
In each of the two cature interrupts, I calculate two times (MRx 
values) where the match interrupts should be called, and enable the 
match interrupts:


void FIQ_Handler (void) __attribute__ ((interrupt("FIQ")));
void FIQ_Handler (void)
{
  int now;
  int ir;

  ir = T0->IR;
  if (ir & 0x01)
  {
    /* Match 0 event */
    /* ... */
    T0->MCR &= ~0x0001;  /* Disable MR0 interrupt */
    T0->IR = 0x01;
  }
  else if (ir & 0x02)
  {
    /* Match 1 event */
    /* ... */
    T0->MCR &= ~0x0008;  /* Disable MR1 interrupt */
    T0->IR = 0x02;
  }
  else if (ir & 0x04)
  {
    /* Match 2 event */
    /* ... */
    T0->MCR &= ~0x0040;  /* Disable MR2 interrupt */
    T0->IR = 0x04;
  }
  else if (ir & 0x08)
  {
    /* Match 3 event */
    /* ... */
    T0->MCR &= ~0x0200;  /* Disable MR3 interrupt */
    T0->IR = 0x08;
  }
  else if (ir & 0x10)
  {
    /* Capture 0 event */
    now = T0->CR0;
    T0->MR0 = now + ...;
    T0->MR2 = now + ...;
    T0->MCR |= 0x0041;  /* Enable MR0 and MR2 interrupts */
    T0->IR = 0x10;
  }
  else if (ir & 0x20)
  {
    /* Capture 1 event */
    now = T0->CR1;
    T0->MR1 = now + ...;
    T0->MR3 = now + ...;
    T0->MCR |= 0x0208;  /* Enable MR1 and MR3 interrupts */
    T0->IR = 0x20;
  }
}