Content originally posted in LPCWare by hydromet on Tue Nov 18 22:49:30 MST 2014
I need periodic interrupts with T0TC from 0 to 0xffffffffL
PINSEL0_bit.P0_4=2; // select Pin P0.4 as CAP0.1
T0TCR = 2;
T0CTCR = 0; // Set timer counters mode - clock by PCLK
T0PR = 0; // Set timer prescaler
T0MR0 = 3600;// Set timer period
T0MCR = 1; // Set match action - interrupt by MR0 enable without reset counter
T0CCR = 0x38; //Set timer counters mode - clock by CAP0.1 (8 - rising edge, 0x10 - falling edge, 0x20 - interrupt) // 0x38 = (5 << 3) - rising
T0EMR = 0;
VICIntSelect &= ~(1<<VIC_TIMER0);
VICVectAddr0 = (_U32) Tmr0IntOnMR0_isr;
VICVectCntl0 = 0x20 | VIC_TIMER0;
VICIntEnable |= (1<<VIC_TIMER0);
T0TCR = 1;
....................................................................
__irq __arm void Tmr0IntOnMR0_isr(void){
if(T0IR_bit.MR0INT){
// clear interrupt flag
T0IR_bit.MR0INT = 1;
T0MR0 += 3600;
.......................................
}
if(T0IR_bit.CR1INT){
T0IR_bit.CR1INT = 1;
PINSEL0_bit.P0_4=0; // select Pin P0.4 as GPIO
IODIR_bit.P0_4 = 0;
if(IOPIN_bit.P0_4){
........................................
}
else {
........................................
}
PINSEL0_bit.P0_4=2; // select Pin P0.4 as CAP0.1
}
VICVectAddr = 0;
}
