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.

Committer:
clemente
Date:
Tue Jun 18 08:46:50 2013 +0000
Revision:
1:2e81444e49a9
Parent:
0:12422f7c30d3
Child:
2:56a50064749e
added callback function.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
clemente 0:12422f7c30d3 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
clemente 0:12422f7c30d3 2 *
clemente 0:12422f7c30d3 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
clemente 0:12422f7c30d3 4 * and associated documentation files (the "Software"), to deal in the Software without
clemente 0:12422f7c30d3 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
clemente 0:12422f7c30d3 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
clemente 0:12422f7c30d3 7 * Software is furnished to do so, subject to the following conditions:
clemente 0:12422f7c30d3 8 *
clemente 0:12422f7c30d3 9 * The above copyright notice and this permission notice shall be included in all copies or
clemente 0:12422f7c30d3 10 * substantial portions of the Software.
clemente 0:12422f7c30d3 11 *
clemente 0:12422f7c30d3 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
clemente 0:12422f7c30d3 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
clemente 0:12422f7c30d3 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
clemente 0:12422f7c30d3 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
clemente 0:12422f7c30d3 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
clemente 0:12422f7c30d3 17 */
clemente 0:12422f7c30d3 18
clemente 0:12422f7c30d3 19 #include "KL25Z_RTC.h"
clemente 0:12422f7c30d3 20 #include "rtc_api.h"
clemente 0:12422f7c30d3 21
clemente 0:12422f7c30d3 22 unsigned int _alarm;
clemente 0:12422f7c30d3 23
clemente 1:2e81444e49a9 24 void (*user2_fptr)(void); // Pointers to user function called after
clemente 1:2e81444e49a9 25 void (*user1_fptr)(void); // IRQ assertion.
clemente 1:2e81444e49a9 26
clemente 1:2e81444e49a9 27
clemente 0:12422f7c30d3 28 KL25Z_RTC::KL25Z_RTC( unsigned int alarm)
clemente 0:12422f7c30d3 29 {
clemente 0:12422f7c30d3 30 _alarm = alarm;
clemente 0:12422f7c30d3 31 }
clemente 0:12422f7c30d3 32
clemente 0:12422f7c30d3 33 unsigned int KL25Z_RTC::RTC_GetAlarm( void)
clemente 0:12422f7c30d3 34 {
clemente 0:12422f7c30d3 35 return _alarm;
clemente 0:12422f7c30d3 36 }
clemente 0:12422f7c30d3 37
clemente 0:12422f7c30d3 38 void KL25Z_RTC::RTC_Start( void)
clemente 0:12422f7c30d3 39 {
clemente 0:12422f7c30d3 40 rtc_init();
clemente 0:12422f7c30d3 41
clemente 0:12422f7c30d3 42 NVIC_EnableIRQ( RTC_Seconds_IRQn);
clemente 0:12422f7c30d3 43 NVIC_EnableIRQ( RTC_IRQn);
clemente 0:12422f7c30d3 44
clemente 0:12422f7c30d3 45 NVIC_SetVector( RTC_Seconds_IRQn, (uint32_t)&_RTC_Seconds_IRQHandler);
clemente 0:12422f7c30d3 46 NVIC_SetVector( RTC_IRQn, (uint32_t)&_RTC_IRQHandler);
clemente 0:12422f7c30d3 47
clemente 0:12422f7c30d3 48 RTC->TAR = RTC->TSR + _alarm;
clemente 0:12422f7c30d3 49 RTC->IER = RTC_IER_TSIE_MASK | RTC_IER_TAIE_MASK;
clemente 0:12422f7c30d3 50
clemente 0:12422f7c30d3 51 }
clemente 0:12422f7c30d3 52
clemente 1:2e81444e49a9 53 void KL25Z_RTC::RTC_Start( void(*sec_ptr)(void), void(*alrm_ptr)(void))
clemente 1:2e81444e49a9 54 {
clemente 1:2e81444e49a9 55 rtc_init();
clemente 1:2e81444e49a9 56
clemente 1:2e81444e49a9 57 RTC->IER = 0;
clemente 1:2e81444e49a9 58
clemente 1:2e81444e49a9 59 if ( sec_ptr != NULL) {
clemente 1:2e81444e49a9 60 NVIC_EnableIRQ( RTC_Seconds_IRQn);
clemente 1:2e81444e49a9 61 NVIC_SetVector( RTC_Seconds_IRQn, (uint32_t)&_RTC_Seconds_IRQHandler);
clemente 1:2e81444e49a9 62 user1_fptr = sec_ptr;
clemente 1:2e81444e49a9 63 RTC->IER |= RTC_IER_TSIE_MASK;
clemente 1:2e81444e49a9 64 }
clemente 1:2e81444e49a9 65
clemente 1:2e81444e49a9 66 if ( alrm_ptr != NULL) {
clemente 1:2e81444e49a9 67 RTC->TAR = RTC->TSR + _alarm;
clemente 1:2e81444e49a9 68 NVIC_EnableIRQ( RTC_IRQn);
clemente 1:2e81444e49a9 69 NVIC_SetVector( RTC_IRQn, (uint32_t)&_RTC_IRQHandler);
clemente 1:2e81444e49a9 70 user2_fptr = alrm_ptr;
clemente 1:2e81444e49a9 71 RTC->IER |= RTC_IER_TAIE_MASK;
clemente 1:2e81444e49a9 72 }
clemente 1:2e81444e49a9 73
clemente 1:2e81444e49a9 74 }
clemente 1:2e81444e49a9 75
clemente 1:2e81444e49a9 76 void KL25Z_RTC::RTC_Seconds_CallBack( void(*fptr)(void))
clemente 1:2e81444e49a9 77 {
clemente 1:2e81444e49a9 78 }
clemente 1:2e81444e49a9 79
clemente 0:12422f7c30d3 80 unsigned int KL25Z_RTC::RTC_Read( void)
clemente 0:12422f7c30d3 81 {
clemente 0:12422f7c30d3 82 return RTC->TSR;
clemente 0:12422f7c30d3 83 }
clemente 0:12422f7c30d3 84
clemente 0:12422f7c30d3 85 void KL25Z_RTC::_RTC_IRQHandler(void) {
clemente 0:12422f7c30d3 86 // error_led = 1;
clemente 0:12422f7c30d3 87 if ( RTC->SR & 0x04) {
clemente 0:12422f7c30d3 88 printf("RTC_Alarm\r\n");
clemente 0:12422f7c30d3 89 RTC->TAR = RTC->TSR + _alarm;
clemente 0:12422f7c30d3 90 }
clemente 1:2e81444e49a9 91 // Run the user supplied function
clemente 1:2e81444e49a9 92 user2_fptr();
clemente 1:2e81444e49a9 93
clemente 0:12422f7c30d3 94 }
clemente 0:12422f7c30d3 95
clemente 0:12422f7c30d3 96
clemente 0:12422f7c30d3 97 void KL25Z_RTC::_RTC_Seconds_IRQHandler(void) {
clemente 0:12422f7c30d3 98 //
clemente 0:12422f7c30d3 99 printf("RTC_Seconds_IRQHandler [%0d].\r\n", rtc_read());
clemente 1:2e81444e49a9 100 // Run the user supplied function
clemente 1:2e81444e49a9 101 user1_fptr();
clemente 0:12422f7c30d3 102 }
clemente 0:12422f7c30d3 103