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cpu/samd21: add rtc periph implementation
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bapclenet
parent
695d702b4f
commit
55aabf9dfb
@ -1 +1 @@
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FEATURES_PROVIDED += transceiver periph_gpio periph_spi cpp periph_timer periph_uart periph_i2c cpp
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FEATURES_PROVIDED += transceiver periph_gpio periph_spi cpp periph_timer periph_uart periph_i2c cpp periph_rtc
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@ -148,6 +148,14 @@ extern "C" {
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#define RANDOM_NUMOF (0U)
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/** @} */
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/**
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* @name RTC configuration
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* @{
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*/
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#define RTC_NUMOF (1U)
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#define RTC_DEV RTC->MODE2
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/** @} */
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/**
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* @name GPIO configuration
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* @{
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204
cpu/samd21/periph/rtc.c
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204
cpu/samd21/periph/rtc.c
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@ -0,0 +1,204 @@
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/*
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* Copyright (C) 2014 Baptiste CLENET
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_samd21
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* @{
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* @file
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* @brief Low-level RTC driver implementation
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* @author Baptiste Clenet <baptiste.clenet@xsoen.com>
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* @}
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*/
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#include <time.h>
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#include "cpu.h"
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#include "periph/rtc.h"
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#include "periph_conf.h"
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#include "sched.h"
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#include "thread.h"
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/* guard file in case no RTC device was specified */
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#if RTC_NUMOF
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typedef struct {
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rtc_alarm_cb_t cb; /**< callback called from RTC interrupt */
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void *arg; /**< argument passed to the callback */
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} rtc_state_t;
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static rtc_state_t rtc_callback;
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/* At 1Hz, RTC goes till 63 years (2^5, see 17.8.22 in datasheet)
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* reference_year is set to 100 (offset) to be in our current time (2000)
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* Thanks to this, the user will be able to set time in 2000's*/
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static uint16_t reference_year = 100;
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void rtc_init(void)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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/* Turn on power manager for RTC */
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PM->APBAMASK.reg |= PM_APBAMASK_RTC;
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SYSCTRL->OSC32K.bit.ENABLE = 0;
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SYSCTRL->OSC32K.bit.ONDEMAND = 1;
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SYSCTRL->OSC32K.bit.RUNSTDBY = 0;
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SYSCTRL->OSC32K.bit.EN1K = 1;
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SYSCTRL->OSC32K.bit.EN32K = 1;
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SYSCTRL->OSC32K.bit.ENABLE = 1;
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/* Setup clock GCLK2 with OSC32K divided by 32 */
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GCLK->GENDIV.reg = GCLK_GENDIV_ID(2)|GCLK_GENDIV_DIV(4);
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while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
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GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_OSC32K | GCLK_GENCTRL_ID(2) | GCLK_GENCTRL_DIVSEL );
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while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
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GCLK->CLKCTRL.reg = (uint32_t)((GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK2 | (RTC_GCLK_ID << GCLK_CLKCTRL_ID_Pos)));
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while (GCLK->STATUS.bit.SYNCBUSY);
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/* DISABLE RTC MASTER */
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while (rtcMode2->STATUS.reg & RTC_STATUS_SYNCBUSY);
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rtc_poweroff();
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/* Reset RTC */
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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rtcMode2->CTRL.reg= RTC_MODE2_CTRL_SWRST;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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/* RTC config with RTC_MODE2_CTRL_CLKREP = 0 (24h) */
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rtcMode2->CTRL.reg = RTC_MODE2_CTRL_PRESCALER_DIV1024|RTC_MODE2_CTRL_MODE_CLOCK;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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rtcMode2->INTENSET.reg = RTC_MODE2_INTENSET_OVF;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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rtc_poweron();
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}
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int rtc_set_time(struct tm *time)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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if ((time->tm_year < reference_year) || (time->tm_year > reference_year + 63)) {
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return -1;
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}
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else {
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rtcMode2->CLOCK.reg = RTC_MODE2_CLOCK_YEAR(time->tm_year - reference_year)
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| RTC_MODE2_CLOCK_MONTH(time->tm_mon + 1)
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| RTC_MODE2_CLOCK_DAY(time->tm_mday)
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| RTC_MODE2_CLOCK_HOUR(time->tm_hour)
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| RTC_MODE2_CLOCK_MINUTE(time->tm_min)
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| RTC_MODE2_CLOCK_SECOND(time->tm_sec);
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}
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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return 0;
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}
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int rtc_get_time(struct tm *time)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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time->tm_year = rtcMode2->CLOCK.bit.YEAR + reference_year;
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if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
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return -1;
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}
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time->tm_mon = rtcMode2->CLOCK.bit.MONTH - 1;
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time->tm_mday = rtcMode2->CLOCK.bit.DAY;
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time->tm_hour = rtcMode2->CLOCK.bit.HOUR;
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time->tm_min = rtcMode2->CLOCK.bit.MINUTE;
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time->tm_sec = rtcMode2->CLOCK.bit.SECOND;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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return 0;
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}
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int rtc_set_alarm(struct tm *time, rtc_alarm_cb_t cb, void *arg)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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rtc_clear_alarm();
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if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
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return -2;
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}
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else {
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rtcMode2->Mode2Alarm[0].ALARM.reg = RTC_MODE2_ALARM_YEAR(time->tm_year - reference_year)
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| RTC_MODE2_ALARM_MONTH(time->tm_mon + 1)
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| RTC_MODE2_ALARM_DAY(time->tm_mday)
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| RTC_MODE2_ALARM_HOUR(time->tm_hour)
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| RTC_MODE2_ALARM_MINUTE(time->tm_min)
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| RTC_MODE2_ALARM_SECOND(time->tm_sec - 1);
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rtcMode2->Mode2Alarm[0].MASK.reg = RTC_MODE2_MASK_SEL(6);
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}
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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/* Setup interrupt */
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NVIC_SetPriority(RTC_IRQn, 10);
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NVIC_EnableIRQ(RTC_IRQn);
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/* Enable IRQ */
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rtc_callback.cb = cb;
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rtc_callback.arg = arg;
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rtcMode2->INTFLAG.reg = RTC_MODE2_INTFLAG_ALARM0;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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rtcMode2->INTENSET.reg = RTC_MODE2_INTENSET_ALARM0;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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return 0;
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}
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int rtc_get_alarm(struct tm *time)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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time->tm_year = rtcMode2->Mode2Alarm[0].ALARM.bit.YEAR + reference_year;
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if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
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return -1;
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}
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time->tm_mon = rtcMode2->Mode2Alarm[0].ALARM.bit.MONTH - 1;
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time->tm_mday = rtcMode2->Mode2Alarm[0].ALARM.bit.DAY;
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time->tm_hour = rtcMode2->Mode2Alarm[0].ALARM.bit.HOUR;
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time->tm_min = rtcMode2->Mode2Alarm[0].ALARM.bit.MINUTE;
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time->tm_sec = rtcMode2->Mode2Alarm[0].ALARM.bit.SECOND;
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while(rtcMode2->STATUS.bit.SYNCBUSY);
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return 0;
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}
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void rtc_clear_alarm(void)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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/* Disable IRQ */
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rtcMode2->INTENCLR.reg = RTC_MODE2_INTENCLR_ALARM0;
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rtc_callback.cb = NULL;
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rtc_callback.arg = NULL;
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}
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void rtc_poweron(void)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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rtcMode2->CTRL.bit.ENABLE = 1;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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}
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void rtc_poweroff(void)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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rtcMode2->CTRL.bit.ENABLE = 0;
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while (rtcMode2->STATUS.bit.SYNCBUSY);
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}
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void isr_rtc(void)
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{
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RtcMode2 *rtcMode2 = &(RTC_DEV);
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uint16_t status = rtcMode2->INTFLAG.reg;
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if (status & RTC_MODE2_INTFLAG_ALARM0) {
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rtc_callback.cb(rtc_callback.arg);
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rtcMode2->INTFLAG.reg = RTC_MODE2_INTFLAG_ALARM0;
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}
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if (status & RTC_MODE2_INTFLAG_OVF) {
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/* At 1Hz, RTC goes till 63 years (2^5, see 17.8.22 in datasheet)
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* Start RTC again with reference_year 64 years more (Be careful with alarm set) */
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reference_year += 64;
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rtcMode2->INTFLAG.reg = RTC_MODE2_INTFLAG_OVF;
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}
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if (sched_context_switch_request) {
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thread_yield();
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}
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}
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#endif /* RTC_NUMOF */
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