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/*
* Copyright (C) 2014 Baptiste CLENET
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_samd21
* @{
* @file
* @brief Low-level RTC driver implementation
* @author Baptiste Clenet <baptiste.clenet@xsoen.com>
* @}
*/
#include <time.h>
#include "cpu.h"
#include "periph/rtc.h"
#include "periph_conf.h"
/* guard file in case no RTC device was specified */
#if RTC_NUMOF
typedef struct {
rtc_alarm_cb_t cb; /**< callback called from RTC interrupt */
void *arg; /**< argument passed to the callback */
} rtc_state_t;
static rtc_state_t rtc_callback;
/* At 1Hz, RTC goes till 63 years (2^5, see 17.8.22 in datasheet)
* reference_year is set to 100 (offset) to be in our current time (2000)
* Thanks to this, the user will be able to set time in 2000's*/
static uint16_t reference_year = 100;
void rtc_init(void)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
/* Turn on power manager for RTC */
PM->APBAMASK.reg |= PM_APBAMASK_RTC;
/* RTC uses External 32,768KHz Oscillator (OSC32K isn't accurate enough p1075/1138)*/
SYSCTRL->XOSC32K.reg = SYSCTRL_XOSC32K_ONDEMAND |
SYSCTRL_XOSC32K_EN32K |
SYSCTRL_XOSC32K_XTALEN |
SYSCTRL_XOSC32K_STARTUP(6) |
SYSCTRL_XOSC32K_ENABLE;
/* Setup clock GCLK2 with OSC32K divided by 32 */
GCLK->GENDIV.reg = GCLK_GENDIV_ID(2)|GCLK_GENDIV_DIV(4);
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) {}
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_XOSC32K | GCLK_GENCTRL_ID(2) | GCLK_GENCTRL_DIVSEL );
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) {}
GCLK->CLKCTRL.reg = (uint32_t)((GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK2 | (RTC_GCLK_ID << GCLK_CLKCTRL_ID_Pos)));
while (GCLK->STATUS.bit.SYNCBUSY) {}
/* DISABLE RTC MASTER */
while (rtcMode2->STATUS.reg & RTC_STATUS_SYNCBUSY) {}
rtc_poweroff();
/* Reset RTC */
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
rtcMode2->CTRL.reg= RTC_MODE2_CTRL_SWRST;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
/* RTC config with RTC_MODE2_CTRL_CLKREP = 0 (24h) */
rtcMode2->CTRL.reg = RTC_MODE2_CTRL_PRESCALER_DIV1024|RTC_MODE2_CTRL_MODE_CLOCK;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
rtcMode2->INTENSET.reg = RTC_MODE2_INTENSET_OVF;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
rtc_poweron();
}
int rtc_set_time(struct tm *time)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
if ((time->tm_year < reference_year) || (time->tm_year > reference_year + 63)) {
return -1;
}
else {
rtcMode2->CLOCK.reg = RTC_MODE2_CLOCK_YEAR(time->tm_year - reference_year)
| RTC_MODE2_CLOCK_MONTH(time->tm_mon + 1)
| RTC_MODE2_CLOCK_DAY(time->tm_mday)
| RTC_MODE2_CLOCK_HOUR(time->tm_hour)
| RTC_MODE2_CLOCK_MINUTE(time->tm_min)
| RTC_MODE2_CLOCK_SECOND(time->tm_sec);
}
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
return 0;
}
int rtc_get_time(struct tm *time)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
time->tm_year = rtcMode2->CLOCK.bit.YEAR + reference_year;
if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
return -1;
}
time->tm_mon = rtcMode2->CLOCK.bit.MONTH - 1;
time->tm_mday = rtcMode2->CLOCK.bit.DAY;
time->tm_hour = rtcMode2->CLOCK.bit.HOUR;
time->tm_min = rtcMode2->CLOCK.bit.MINUTE;
time->tm_sec = rtcMode2->CLOCK.bit.SECOND;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
return 0;
}
int rtc_set_alarm(struct tm *time, rtc_alarm_cb_t cb, void *arg)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
rtc_clear_alarm();
if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
return -2;
}
else {
rtcMode2->Mode2Alarm[0].ALARM.reg = RTC_MODE2_ALARM_YEAR(time->tm_year - reference_year)
| RTC_MODE2_ALARM_MONTH(time->tm_mon + 1)
| RTC_MODE2_ALARM_DAY(time->tm_mday)
| RTC_MODE2_ALARM_HOUR(time->tm_hour)
| RTC_MODE2_ALARM_MINUTE(time->tm_min)
| RTC_MODE2_ALARM_SECOND(time->tm_sec);
rtcMode2->Mode2Alarm[0].MASK.reg = RTC_MODE2_MASK_SEL(6);
}
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
/* Setup interrupt */
NVIC_EnableIRQ(RTC_IRQn);
/* Enable IRQ */
rtc_callback.cb = cb;
rtc_callback.arg = arg;
rtcMode2->INTFLAG.reg = RTC_MODE2_INTFLAG_ALARM0;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
rtcMode2->INTENSET.reg = RTC_MODE2_INTENSET_ALARM0;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
return 0;
}
int rtc_get_alarm(struct tm *time)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
time->tm_year = rtcMode2->Mode2Alarm[0].ALARM.bit.YEAR + reference_year;
if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
return -1;
}
time->tm_mon = rtcMode2->Mode2Alarm[0].ALARM.bit.MONTH - 1;
time->tm_mday = rtcMode2->Mode2Alarm[0].ALARM.bit.DAY;
time->tm_hour = rtcMode2->Mode2Alarm[0].ALARM.bit.HOUR;
time->tm_min = rtcMode2->Mode2Alarm[0].ALARM.bit.MINUTE;
time->tm_sec = rtcMode2->Mode2Alarm[0].ALARM.bit.SECOND;
while(rtcMode2->STATUS.bit.SYNCBUSY) {}
return 0;
}
void rtc_clear_alarm(void)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
/* Disable IRQ */
rtcMode2->INTENCLR.reg = RTC_MODE2_INTENCLR_ALARM0;
rtc_callback.cb = NULL;
rtc_callback.arg = NULL;
}
void rtc_poweron(void)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
rtcMode2->CTRL.bit.ENABLE = 1;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
}
void rtc_poweroff(void)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
rtcMode2->CTRL.bit.ENABLE = 0;
while (rtcMode2->STATUS.bit.SYNCBUSY) {}
}
void isr_rtc(void)
{
RtcMode2 *rtcMode2 = &(RTC_DEV);
uint16_t status = rtcMode2->INTFLAG.reg;
if ((status & RTC_MODE2_INTFLAG_ALARM0) && (rtc_callback.cb != NULL)) {
rtc_callback.cb(rtc_callback.arg);
rtcMode2->INTFLAG.reg = RTC_MODE2_INTFLAG_ALARM0;
}
if (status & RTC_MODE2_INTFLAG_OVF) {
/* At 1Hz, RTC goes till 63 years (2^5, see 17.8.22 in datasheet)
* Start RTC again with reference_year 64 years more (Be careful with alarm set) */
reference_year += 64;
rtcMode2->INTFLAG.reg = RTC_MODE2_INTFLAG_OVF;
}
cortexm_isr_end();
}
#endif /* RTC_NUMOF */
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