I have a FRDM-KL26Z board I am trying to use PIT to get an interrupt, but it fails.
Things that I am doing:
- declare the PIT handler that should print a line of text
void PIT_IRQHandler(void)
{
PRINTF("PIT_IRQHandler \r\n");
}
- set-up PIT
unsigned int *sim_scgc6 = (unsigned int *) 0x4004803C;
*sim_scgc6 |= 1U << 23; // enable clock gate PIT
unsigned int *pit_mcr = (unsigned int *) 0x40037000;
*pit_mcr &= ~(1U << 1); // enable PIT
*pit_mcr &= ~(1U << 0); // timer continues in debug mode
unsigned int *pit_ldval0 = (unsigned int *) 0x40037100;
// *pit_ldval0 = 0x0003E7FF; // setup timer 1 for 256000 cycles
*pit_ldval0 = 0xF;
unsigned int *pit_tctrl0 = (unsigned int *) 0x40037108;
*pit_tctrl0 |= 1U << 1; // enable interrupt
*pit_tctrl0 |= 1U; // start timer
- then enter an infinite loop
I am not getting the line from the PIT handler.
I have attached the full code. Is it something that I am missing? In debug mode I see the timer changing and the TIF flag is set, but the handler is not executed.
