Diff: features/unsupported/tests/KL25Z/rtc/main.cpp

Revision:

0:b74591d5ab33

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/unsupported/tests/KL25Z/rtc/main.cpp	Mon Dec 11 17:54:04 2017 +0000
@@ -0,0 +1,72 @@
+#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);
+    }
+}