Hi All,
I'm trying to setup a general purpose timer on the MC9S08DZ60. I do not want it tied to pin control as I have the pins assigned to other non-timer related I/O.
Below is a snippet of my code:
#define TPM1CH0IRQTIME 400 // Set timer 1 freq to 100us
...
/* Setup timer status and control register A
b6 = 0 TOIE disable overflow interrupts
b5 = 0 CPWMS no PWM mode
b4:b3 CLKSB:CLKSA = 01 sets clock source to bus clock
b2:b0 PS2
S0 = 000 sets prescale to divide by 1 */
TPM1SC = 0x08;
/* Enable irq on timer 1 channel 0
Edge level bits set to 00
MSB MSA bits set to 00 */
TPM1C0SC = 0x40;
/* Setup initial irq trigger time on timer 1 ch 0 */
TPM1C0V = TPM1CNT + TPM1CH0IRQTIME;
/* Clear any pending timer interrupts */
TPM1SC &= 0x7F;
TPM2SC &= 0x7F;
TPM1C0SC &= 0x7F;
TPM1C1SC &= 0x7F;
TPM1C2SC &= 0x7F;
TPM1C3SC &= 0x7F;
TPM1C4SC &= 0x7F;
TPM1C5SC &= 0x7F;
TPM2C0SC &= 0x7F;
TPM2C1SC &= 0x7F;
...
@interrupt void tpm1ch0_irq(void)
{
/* Timer 1 channel 0 interrupt service routine
Used to generate system base time
Increments free running counter every 100us */
/* Clear timer irq flag */
TPM1C0SC &= 0x7F;
TPM1C0V = TPM1CNT + TPM1CH0IRQTIME; /* Reset trigger time */
t100us++; /* Increment 100us timer */
if(t100us >= 10) /* Every 1ms (10*100us) */
{
/* Increment the free running 1msec counter, let it overflow */
ulFreeRunningCounter++;
if(ulFreeRunningCounter == 0)
uwOverflowCounter++; /* Overflow occurred, inc counter */
t100us = 0; /* Reset t100us timer */
}
} /* end tpm1ch0_irq */
Problem is the irq will not fire at all. Any ideas as to why? Please note I am clearing the main interrupt flag (via CLI) prior to starting the main routine.
Thanks in advance.
