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