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SAML21/RTC: Add RTC driver

pr/gpio
Baptiste 7 years ago
parent
commit
455555304c
  1. 1
      boards/saml21-xpro/Makefile.features
  2. 5
      boards/saml21-xpro/include/periph_conf.h
  3. 239
      cpu/saml21/periph/rtc.c

1
boards/saml21-xpro/Makefile.features

@ -1,6 +1,7 @@
# Put defined MCU peripherals here (in alphabetical order)
FEATURES_PROVIDED += periph_cpuid
FEATURES_PROVIDED += periph_gpio
FEATURES_PROVIDED += periph_rtc
FEATURES_PROVIDED += periph_rtt
FEATURES_PROVIDED += periph_spi
FEATURES_PROVIDED += periph_timer

5
boards/saml21-xpro/include/periph_conf.h

@ -86,7 +86,10 @@ extern "C" {
* @name RTC configuration
* @{
*/
#define RTC_NUMOF (0)
#define RTC_NUMOF (1)
#define EXTERNAL_OSC32_SOURCE 1
#define INTERNAL_OSC32_SOURCE 0
#define ULTRA_LOW_POWER_INTERNAL_OSC_SOURCE 0
/** @} */
/**

239
cpu/saml21/periph/rtc.c

@ -0,0 +1,239 @@
/*
* 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_saml21
* @{
* @file
* @brief Low-level RTC driver implementation
* @author Baptiste Clenet <baptiste.clenet@xsoen.com>
* @autor ported to SAML21 by FWX <FWX@dialine.fr>
* @}
*/
#include <time.h>
#include "cpu.h"
#include "periph/rtc.h"
#include "periph_conf.h"
#include "sched.h"
#include "thread.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)
{
/* Turn on power manager for RTC */
/* Already done in cpu_init() */
/* MCLK->APBAMASK.reg |= MCLK_APBAMASK_RTC; */
/* DISABLE RTC MASTER */
rtc_poweroff();
#if EXTERNAL_OSC32_SOURCE
/* RTC uses External 32,768KHz Oscillator */
OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_XTALEN
| OSC32KCTRL_XOSC32K_EN1K
| OSC32KCTRL_XOSC32K_RUNSTDBY
| OSC32KCTRL_OSC32K_ENABLE;
/* Wait XOSC32K Ready */
while (OSC32KCTRL->STATUS.bit.XOSC32KRDY==0);
/* RTC source clock is external oscillator at 1kHz */
OSC32KCTRL->RTCCTRL.reg = OSC32KCTRL_RTCCTRL_RTCSEL_XOSC1K;
#endif /* EXTERNAL_OSC32_SOURCE */
#if INTERNAL_OSC32_SOURCE
uint32_t * pCalibrationArea;
uint32_t osc32kcal;
/* Read OSC32KCAL, calibration data for OSC32 !!! */
pCalibrationArea = (uint32_t*) NVMCTRL_OTP5;
osc32kcal = ( (*pCalibrationArea) & 0x1FC0 ) >> 6;
/* RTC use Low Power Internal Oscillator at 1kHz */
OSC32KCTRL->OSC32K.reg = OSC32KCTRL_OSC32K_RUNSTDBY
| OSC32KCTRL_OSC32K_EN1K
| OSC32KCTRL_OSC32K_CALIB(osc32kcal)
| OSC32KCTRL_OSC32K_ENABLE;
/* Wait OSC32K Ready */
while (OSC32KCTRL->STATUS.bit.OSC32KRDY==0);
/* RTC uses internal 32,768KHz Oscillator */
OSC32KCTRL->RTCCTRL.reg = OSC32KCTRL_RTCCTRL_RTCSEL_OSC1K;
#endif /* INTERNAL_OSC32_SOURCE */
#if ULTRA_LOW_POWER_INTERNAL_OSC_SOURCE
/* RTC uses Ultra Low Power internal 32,768KHz Oscillator */
OSC32KCTRL->RTCCTRL.reg = OSC32KCTRL_RTCCTRL_RTCSEL_ULP1K;
#endif /* ULTRA_LOW_POWER_INTERNAL_OSC_SOURCE */
/* Software Reset the RTC */
RTC->MODE2.CTRLA.bit.SWRST = 1;
/* Wait end of reset */
while (RTC->MODE2.CTRLA.bit.SWRST);
/* RTC config with RTC_MODE2_CTRL_CLKREP = 0 (24h) */
RTC->MODE2.CTRLA.reg = RTC_MODE2_CTRLA_PRESCALER_DIV1024 | /* CLK_RTC_CNT = 1KHz / 1024 -> 1Hz */
RTC_MODE2_CTRLA_MODE_CLOCK | /* Mode 2: Clock/Calendar */
RTC_MODE2_CTRLA_SYNCDIS; /* Clock Read Synchronization Enable */
/* Clear interrupt flags */
RTC->MODE2.INTFLAG.bit.OVF = 1;
RTC->MODE2.INTFLAG.bit.ALARM0 = 1;
rtc_poweron();
}
int rtc_set_time(struct tm *time)
{
if ((time->tm_year < reference_year) || (time->tm_year > reference_year + 63)) {
return -1;
}
else {
while (RTC->MODE2.SYNCBUSY.bit.CLOCK);
RTC->MODE2.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 (RTC->MODE2.SYNCBUSY.bit.CLOCK);
}
return 0;
}
int rtc_get_time(struct tm *time)
{
RTC_MODE2_CLOCK_Type clock;
/* Read register in one time */
clock.reg = RTC->MODE2.CLOCK.reg;
time->tm_year = clock.bit.YEAR + reference_year;
if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
return -1;
}
time->tm_mon = clock.bit.MONTH - 1;
time->tm_mday = clock.bit.DAY;
time->tm_hour = clock.bit.HOUR;
time->tm_min = clock.bit.MINUTE;
time->tm_sec = clock.bit.SECOND;
return 0;
}
int rtc_set_alarm(struct tm *time, rtc_alarm_cb_t cb, void *arg)
{
rtc_clear_alarm();
if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
return -2;
}
else {
RTC->MODE2.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);
RTC->MODE2.Mode2Alarm[0].MASK.reg = RTC_MODE2_MASK_SEL(6);
while (RTC->MODE2.SYNCBUSY.bit.ALARM0);
}
/* Setup interrupt */
NVIC_EnableIRQ(RTC_IRQn);
/* Enable IRQ */
rtc_callback.cb = cb;
rtc_callback.arg = arg;
RTC->MODE2.INTFLAG.bit.ALARM0 = 1;
RTC->MODE2.INTENSET.bit.ALARM0 = 1;
return 0;
}
int rtc_get_alarm(struct tm *time)
{
RTC_MODE2_ALARM_Type alarm;
/* Read alarm register in one time */
alarm.reg = RTC->MODE2.Mode2Alarm[0].ALARM.reg;
time->tm_year = alarm.bit.YEAR + reference_year;
if ((time->tm_year < reference_year) || (time->tm_year > (reference_year + 63))) {
return -1;
}
time->tm_mon = alarm.bit.MONTH - 1;
time->tm_mday = alarm.bit.DAY;
time->tm_hour = alarm.bit.HOUR;
time->tm_min = alarm.bit.MINUTE;
time->tm_sec = alarm.bit.SECOND;
return 0;
}
void rtc_clear_alarm(void)
{
/* disable interrupt */
RTC->MODE2.INTENCLR.bit.ALARM0 = 1;
rtc_callback.cb = NULL;
rtc_callback.arg = NULL;
}
void rtc_poweron(void)
{
RTC->MODE2.CTRLA.bit.ENABLE = 1;
while (RTC->MODE2.SYNCBUSY.bit.ENABLE);
}
void rtc_poweroff(void)
{
RTC->MODE2.CTRLA.bit.ENABLE = 0;
while (RTC->MODE2.SYNCBUSY.bit.ENABLE);
}
void isr_rtc(void)
{
if (RTC->MODE2.INTFLAG.bit.ALARM0) {
rtc_callback.cb(rtc_callback.arg);
/* clear flag */
RTC->MODE2.INTFLAG.bit.ALARM0 = 1;
}
if (RTC->MODE2.INTFLAG.bit.OVF) {
/* clear flag */
RTC->MODE2.INTFLAG.bit.OVF = 1;
/* 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;
}
if (sched_context_switch_request) {
thread_yield();
}
}
#endif /* RTC_NUMOF */
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