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.h

Revision:
4:3bd0dc0c2b2e
Parent:
3:2cee0b9ac1ff
--- a/KL25Z_RTC.h	Fri Jun 21 02:22:00 2013 +0000
+++ b/KL25Z_RTC.h	Sun Aug 25 22:13:55 2013 +0000
@@ -66,7 +66,14 @@
      */
     KL25Z_RTC( unsigned int alarm);
     
-    /** Start the RTC module
+    /** Desctructor
+    */
+    ~KL25Z_RTC();
+    
+    /** Start the RTC module, using IRQ but without registering user defined callback functions.
+     * Access to the elapsed time is possible using the "Read" methid.
+     * The IRQ transaction is visible through "RTC_isIRQxxxxDone" methods.
+     *
      * @param none
      * @return none
      */
@@ -95,6 +102,24 @@
      * @return  the second elapsed
      */
     unsigned int RTC_Read( void);
+
+    /** Return the status of the IRQ for seconds elapsed.
+     * Use this function for a polling like method, using the IRQ internally the module but without callbacks define.
+     * The flag is reset after the read.
+     *
+     * @param   none
+     * @return  1 if the IRQ is done. 
+     */    
+    unsigned int RTC_isIRQSecondDone( void);
+    
+    /** Return the status of the IRQ for the alarm.
+     * Use this function for a polling like method, using the IRQ internally the module but without callbacks define.
+     * The flag is reset after the read.
+     *
+     * @param   none
+     * @return  1 if the IRQ is done.
+     */        
+    unsigned int RTC_isIRQAlarmDone( void);
     
 private: