Lpc2000

Hi,

I only can make the timer-interrupt work (the only interrupt at this time)
when
the I-bit (interrupt disable bit) of the CPSR is cleared each time at the
end of the timer-ISR.
What could be the reason that the I-bit is re-set after each interrupt?
Does my debugger (Nohau) has something to do with it?

/***************************************************************************
***/
void Timer_OnInterrupt()
/***************************************************************************
***/
{
// clear interrupt flag on peripheral level
// At this moment, only one interrupt source (MR0) is used
LPC21xx_T0IR |= 0x01;	// clear MR0 Interrupt

LPC21xx_VICSoftIntClear = IRQ_TIMER_0; // bit 4 = Timer0

// test output 1
Output_Set	(PORT_0);
Output_Clear	(PORT_0);

// Always leave this at the end of ISR
// Update priority hardware
LPC21xx_VICVectAddr = 0x00000000;

// Need to re-clear I-bit, so interrupts keep working !
 __asm__("mrs r0, cpsr");
 __asm__("bic r0, r0, #0x80");	 
 __asm__("msr cpsr, r0");

}

Thanks,

Pascal Degryze
PDG@...
R&D department

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