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73 lines
1.5 KiB
73 lines
1.5 KiB
#include "mbed.h"
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DigitalOut status_led(LED_BLUE);
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DigitalOut error_led(LED_RED);
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extern "C" void RTC_IRQHandler(void) {
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error_led = 0;
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}
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extern "C" void RTC_Seconds_IRQHandler(void) {
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error_led = 0;
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}
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extern "C" void HardFault_Handler(void) {
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error_led = 0;
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}
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extern "C" void NMI_Handler_Handler(void) {
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error_led = 0;
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}
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void rtc_init(void) {
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// enable the clock to SRTC module register space
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SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
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SIM->SOPT1 = (SIM->SOPT1 & ~SIM_SOPT1_OSC32KSEL_MASK) | SIM_SOPT1_OSC32KSEL(0);
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// disable interrupts
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NVIC_DisableIRQ(RTC_Seconds_IRQn);
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NVIC_DisableIRQ(RTC_IRQn);
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// Reset
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RTC->CR = RTC_CR_SWR_MASK;
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RTC->CR &= ~RTC_CR_SWR_MASK;
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// Allow write
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RTC->CR = RTC_CR_UM_MASK | RTC_CR_SUP_MASK;
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NVIC_EnableIRQ(RTC_Seconds_IRQn);
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NVIC_EnableIRQ(RTC_Seconds_IRQn);
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printf("LR: 0x%x\n", RTC->LR);
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printf("CR: 0x%x\n", RTC->CR);
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wait(1);
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if (RTC->SR & RTC_SR_TIF_MASK){
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RTC->TSR = 0;
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}
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RTC->TCR = 0;
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// After setting this bit, wait the oscillator startup time before enabling
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// the time counter to allow the clock time to stabilize
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RTC->CR |= RTC_CR_OSCE_MASK;
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for (volatile int i=0; i<0x600000; i++);
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//enable seconds interrupts
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RTC->IER |= RTC_IER_TSIE_MASK;
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// enable time counter
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RTC->SR |= RTC_SR_TCE_MASK;
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}
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int main() {
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error_led = 1;
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rtc_init();
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while (true) {
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wait(1);
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status_led = !status_led;
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printf("%u\n", RTC->TSR);
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}
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}
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