4 volatile uint32_t msTicks;
6 void SysTick_Handler(void) {
10 void Delay(uint32_t dlyTicks) {
14 while ((msTicks - curTicks) < dlyTicks);
19 SysTick_Config(SystemCoreClock / 1000);
21 SIM->SCGC6 |= SIM_SCGC6_PIT_MASK; // Clock PIT
22 PIT->MCR = 0; // Enable PIT
25 PIT->CHANNEL[1].LDVAL = 0xFFFFFFFF;
26 PIT->CHANNEL[1].TCTRL = 0x0; // Disable Interrupts
27 PIT->CHANNEL[1].TCTRL |= PIT_TCTRL_CHN_MASK; // Chain to timer 0
28 PIT->CHANNEL[1].TCTRL |= PIT_TCTRL_TEN_MASK; // Start timer 1
31 PIT->CHANNEL[0].LDVAL = 0xFFFFFFFF;
32 PIT->CHANNEL[0].TCTRL = PIT_TCTRL_TEN_MASK; // Start timer 0, disable interrupts
34 DigitalOut led(LED_BLUE);
39 uint64_t ticks = (uint64_t)PIT->LTMR64H << 32;
40 ticks |= (uint64_t)PIT->LTMR64L;
41 printf("ticks: 0x%x%x\n", (uint32_t)(ticks>>32), (uint32_t)(ticks & 0xFFFFFFFF));
43 ticks = (~ticks) / 24;
44 uint32_t us = (uint32_t)(0xFFFFFFFF & ticks);
46 printf("us : 0x%x\n", us);