Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

features/unsupported/tests/KL25Z/rtc/main.cpp@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 #include "mbed.h"
elessair 0:f269e3021894 2
elessair 0:f269e3021894 3 DigitalOut status_led(LED_BLUE);
elessair 0:f269e3021894 4 DigitalOut error_led(LED_RED);
elessair 0:f269e3021894 5
elessair 0:f269e3021894 6 extern "C" void RTC_IRQHandler(void) {
elessair 0:f269e3021894 7 error_led = 0;
elessair 0:f269e3021894 8 }
elessair 0:f269e3021894 9
elessair 0:f269e3021894 10 extern "C" void RTC_Seconds_IRQHandler(void) {
elessair 0:f269e3021894 11 error_led = 0;
elessair 0:f269e3021894 12 }
elessair 0:f269e3021894 13
elessair 0:f269e3021894 14 extern "C" void HardFault_Handler(void) {
elessair 0:f269e3021894 15 error_led = 0;
elessair 0:f269e3021894 16 }
elessair 0:f269e3021894 17
elessair 0:f269e3021894 18 extern "C" void NMI_Handler_Handler(void) {
elessair 0:f269e3021894 19 error_led = 0;
elessair 0:f269e3021894 20 }
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22 void rtc_init(void) {
elessair 0:f269e3021894 23 // enable the clock to SRTC module register space
elessair 0:f269e3021894 24 SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
elessair 0:f269e3021894 25 SIM->SOPT1 = (SIM->SOPT1 & ~SIM_SOPT1_OSC32KSEL_MASK) | SIM_SOPT1_OSC32KSEL(0);
elessair 0:f269e3021894 26
elessair 0:f269e3021894 27 // disable interrupts
elessair 0:f269e3021894 28 NVIC_DisableIRQ(RTC_Seconds_IRQn);
elessair 0:f269e3021894 29 NVIC_DisableIRQ(RTC_IRQn);
elessair 0:f269e3021894 30
elessair 0:f269e3021894 31 // Reset
elessair 0:f269e3021894 32 RTC->CR = RTC_CR_SWR_MASK;
elessair 0:f269e3021894 33 RTC->CR &= ~RTC_CR_SWR_MASK;
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 // Allow write
elessair 0:f269e3021894 36 RTC->CR = RTC_CR_UM_MASK | RTC_CR_SUP_MASK;
elessair 0:f269e3021894 37
elessair 0:f269e3021894 38 NVIC_EnableIRQ(RTC_Seconds_IRQn);
elessair 0:f269e3021894 39 NVIC_EnableIRQ(RTC_Seconds_IRQn);
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 printf("LR: 0x%x\n", RTC->LR);
elessair 0:f269e3021894 42 printf("CR: 0x%x\n", RTC->CR);
elessair 0:f269e3021894 43 wait(1);
elessair 0:f269e3021894 44 if (RTC->SR & RTC_SR_TIF_MASK){
elessair 0:f269e3021894 45 RTC->TSR = 0;
elessair 0:f269e3021894 46 }
elessair 0:f269e3021894 47 RTC->TCR = 0;
elessair 0:f269e3021894 48
elessair 0:f269e3021894 49 // After setting this bit, wait the oscillator startup time before enabling
elessair 0:f269e3021894 50 // the time counter to allow the clock time to stabilize
elessair 0:f269e3021894 51 RTC->CR |= RTC_CR_OSCE_MASK;
elessair 0:f269e3021894 52 for (volatile int i=0; i<0x600000; i++);
elessair 0:f269e3021894 53
elessair 0:f269e3021894 54 //enable seconds interrupts
elessair 0:f269e3021894 55 RTC->IER |= RTC_IER_TSIE_MASK;
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 // enable time counter
elessair 0:f269e3021894 58 RTC->SR |= RTC_SR_TCE_MASK;
elessair 0:f269e3021894 59
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 }
elessair 0:f269e3021894 62
elessair 0:f269e3021894 63 int main() {
elessair 0:f269e3021894 64 error_led = 1;
elessair 0:f269e3021894 65 rtc_init();
elessair 0:f269e3021894 66
elessair 0:f269e3021894 67 while (true) {
elessair 0:f269e3021894 68 wait(1);
elessair 0:f269e3021894 69 status_led = !status_led;
elessair 0:f269e3021894 70 printf("%u\n", RTC->TSR);
elessair 0:f269e3021894 71 }
elessair 0:f269e3021894 72 }