clemente di caprio / KL25Z_RTC

Class for the RTC module.

Dependents:   FRDM_RTC

Please pay attention

This library works only with the FRDM board connected to USB via OpenSDA connector The OpenSDA chip has a pin connected, via the resistor R24, to the KL25Z CLOCKIN pin. So this is why it works.

If you use the board alone, you must configure the MCU in a different manner. I follow the instruction in this link: https://community.freescale.com/docs/DOC-94734 but without success.

This is the code I added, for testing purpose, to my library:

Initialization code for RTC use

    // Enable the internal reference clock. MCGIRCLK is active.
    MCG->C1 |= MCG_C1_IRCLKEN_MASK;
    // Select the slow internal reference clock source.
    MCG->C2 &= ~(MCG_C2_IRCS_MASK);
    // Set PTC1 as RTC_CLKIN and select 32 KHz clock source for the RTC module.
    PORTC->PCR[1] &= ~PORT_PCR_MUX_MASK;
    PORTC->PCR[1] = PORT_PCR_MUX(1);    
    SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK;
    SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(2);
    // Set PTC3 as CLKOUT pin and selects the MCGIRCLK clock to output on the CLKOUT pin.
    SIM->SOPT2 |= SIM_SOPT2_CLKOUTSEL(0x4);
    PORTC->PCR[3] |= (PORT_PCR_MUX(0x5));
    
    // enable RTC clock
    SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
    RTC->CR = RTC_CR_SWR_MASK;
    RTC->CR &= ~RTC_CR_SWR_MASK;
    
    if (RTC->SR & RTC_SR_TIF_MASK){
         RTC->TSR = 0x00000000;
    }    
    RTC->TCR = RTC_TCR_CIR(1) | RTC_TCR_TCR(0xFF);

    ecc...

But as I said this did not work for me.

I build this class around the rtc api available from mbed. I just added user call back function and the alarm setting.

The demo software use two function to put the MCU in sleep or deepsleep. The MCU will restart for the RTC IRQ.

Diff: KL25Z_RTC.cpp

Revision:
1:2e81444e49a9
Parent:
0:12422f7c30d3
Child:
2:56a50064749e
--- a/KL25Z_RTC.cpp	Tue Jun 18 06:14:54 2013 +0000
+++ b/KL25Z_RTC.cpp	Tue Jun 18 08:46:50 2013 +0000
@@ -21,6 +21,10 @@
 
 unsigned int _alarm;
 
+void (*user2_fptr)(void);               // Pointers to user function called after
+void (*user1_fptr)(void);               // IRQ assertion.
+
+
 KL25Z_RTC::KL25Z_RTC( unsigned int alarm)
 {
     _alarm = alarm;
@@ -46,6 +50,33 @@
 
 }
 
+void KL25Z_RTC::RTC_Start( void(*sec_ptr)(void), void(*alrm_ptr)(void))
+{
+    rtc_init();
+    
+    RTC->IER = 0;
+    
+    if ( sec_ptr != NULL) {
+        NVIC_EnableIRQ( RTC_Seconds_IRQn);
+        NVIC_SetVector( RTC_Seconds_IRQn, (uint32_t)&_RTC_Seconds_IRQHandler); 
+        user1_fptr = sec_ptr;
+        RTC->IER |= RTC_IER_TSIE_MASK;
+    }
+    
+    if ( alrm_ptr != NULL) {
+        RTC->TAR = RTC->TSR + _alarm;
+        NVIC_EnableIRQ( RTC_IRQn);
+        NVIC_SetVector( RTC_IRQn, (uint32_t)&_RTC_IRQHandler); 
+        user2_fptr = alrm_ptr;
+        RTC->IER |= RTC_IER_TAIE_MASK;
+    }
+    
+}
+
+void KL25Z_RTC::RTC_Seconds_CallBack( void(*fptr)(void))
+{
+}
+
 unsigned int KL25Z_RTC::RTC_Read( void)
 {
     return RTC->TSR;
@@ -57,11 +88,16 @@
         printf("RTC_Alarm\r\n");
         RTC->TAR = RTC->TSR + _alarm;
     }
+    // Run the user supplied function
+    user2_fptr();
+    
 }
 
 
 void KL25Z_RTC::_RTC_Seconds_IRQHandler(void) {
     //
     printf("RTC_Seconds_IRQHandler [%0d].\r\n", rtc_read());
+    // Run the user supplied function
+    user1_fptr();
 }