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bring in RTC functionality

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This commit is contained in:
joeycastillo
2024-09-18 15:06:38 -04:00
parent 0585a1d0d8
commit 29d6ce42f1
5 changed files with 63 additions and 84 deletions
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74
watch-library/hardware/watch/watch_rtc.c
View File

@@ -22,56 +22,41 @@
* SOFTWARE.
*/
#include "watch_rtc.h"
#include <stddef.h>
ext_irq_cb_t tick_callbacks[8];
ext_irq_cb_t alarm_callback;
ext_irq_cb_t btn_alarm_callback;
ext_irq_cb_t a2_callback;
ext_irq_cb_t a4_callback;
#include "watch_rtc.h"
#include "watch_private.h"
watch_cb_t tick_callbacks[8];
watch_cb_t alarm_callback;
watch_cb_t btn_alarm_callback;
watch_cb_t a2_callback;
watch_cb_t a4_callback;
void watch_rtc_callback(uint16_t interrupt_status);
bool _watch_rtc_is_enabled(void) {
return RTC->MODE2.CTRLA.bit.ENABLE;
}
static void _sync_rtc(void) {
while (RTC->MODE2.SYNCBUSY.reg);
return rtc_is_enabled();
}
void _watch_rtc_init(void) {
MCLK->APBAMASK.reg |= MCLK_APBAMASK_RTC;
if (_watch_rtc_is_enabled()) return; // don't reset the RTC if it's already set up.
RTC->MODE2.CTRLA.bit.ENABLE = 0;
_sync_rtc();
RTC->MODE2.CTRLA.bit.SWRST = 1;
_sync_rtc();
RTC->MODE2.CTRLA.bit.MODE = RTC_MODE2_CTRLA_MODE_CLOCK_Val;
RTC->MODE2.CTRLA.bit.PRESCALER = RTC_MODE2_CTRLA_PRESCALER_DIV1024_Val;
RTC->MODE2.CTRLA.bit.CLOCKSYNC = 1;
RTC->MODE2.CTRLA.bit.ENABLE = 1;
_sync_rtc();
rtc_init();
#ifdef STATIC_FREQCORR
watch_rtc_freqcorr_write(STATIC_FREQCORR, 0);
#endif
rtc_enable();
rtc_configure_callback(watch_rtc_callback);
}
void watch_rtc_set_date_time(watch_date_time date_time) {
_sync_rtc(); // Double sync as without it at high Hz faces setting time is unrealiable (specifically, set_time_hackwatch)
RTC->MODE2.CLOCK.reg = date_time.reg;
_sync_rtc();
void watch_rtc_set_date_time(rtc_date_time date_time) {
rtc_set_date_time(date_time);
}
watch_date_time watch_rtc_get_date_time(void) {
watch_date_time retval;
_sync_rtc();
retval.reg = RTC->MODE2.CLOCK.reg;
return retval;
rtc_date_time watch_rtc_get_date_time(void) {
return rtc_get_date_time();
}
void watch_rtc_register_tick_callback(ext_irq_cb_t callback) {
void watch_rtc_register_tick_callback(watch_cb_t callback) {
watch_rtc_register_periodic_callback(callback, 1);
}
@@ -79,7 +64,7 @@ void watch_rtc_disable_tick_callback(void) {
watch_rtc_disable_periodic_callback(1);
}
void watch_rtc_register_periodic_callback(ext_irq_cb_t callback, uint8_t frequency) {
void watch_rtc_register_periodic_callback(watch_cb_t callback, uint8_t frequency) {
// we told them, it has to be a power of 2.
if (__builtin_popcount(frequency) != 1) return;
@@ -111,7 +96,7 @@ void watch_rtc_disable_all_periodic_callbacks(void) {
watch_rtc_disable_matching_periodic_callbacks(0xFF);
}
void watch_rtc_register_alarm_callback(ext_irq_cb_t callback, watch_date_time alarm_time, watch_rtc_alarm_match mask) {
void watch_rtc_register_alarm_callback(watch_cb_t callback, rtc_date_time alarm_time, rtc_alarm_match mask) {
RTC->MODE2.Mode2Alarm[0].ALARM.reg = alarm_time.reg;
RTC->MODE2.Mode2Alarm[0].MASK.reg = mask;
RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_ALARM0;
@@ -125,8 +110,7 @@ void watch_rtc_disable_alarm_callback(void) {
RTC->MODE2.INTENCLR.reg = RTC_MODE2_INTENCLR_ALARM0;
}
void RTC_Handler(void) {
uint16_t interrupt_status = RTC->MODE2.INTFLAG.reg;
void watch_rtc_callback(uint16_t interrupt_status) {
uint16_t interrupt_enabled = RTC->MODE2.INTENSET.reg;
if ((interrupt_status & interrupt_enabled) & RTC_MODE2_INTFLAG_PER_Msk) {
@@ -162,8 +146,7 @@ void RTC_Handler(void) {
}
}
void watch_rtc_enable(bool en)
{
void watch_rtc_enable(bool en) {
// Writing it twice - as it's quite dangerous operation.
// If write fails - we might hang with RTC off, which means no recovery possible
while (RTC->MODE2.SYNCBUSY.reg);
@@ -173,8 +156,7 @@ void watch_rtc_enable(bool en)
while (RTC->MODE2.SYNCBUSY.reg);
}
void watch_rtc_freqcorr_write(int16_t value, int16_t sign)
{
void watch_rtc_freqcorr_write(int16_t value, int16_t sign) {
RTC_FREQCORR_Type data;
data.bit.VALUE = value;

6
watch-library/shared/watch/watch.h
View File

@@ -57,7 +57,11 @@
deepest sleep mode available on the SAM L22.
*/
// #include "watch_rtc.h"
/** @brief Typedef for a general-purpose callback function.
*/
typedef void (*watch_cb_t)(void);
#include "watch_rtc.h"
// #include "watch_slcd.h"
// #include "watch_extint.h"
#include "watch_tcc.h"

50
watch-library/shared/watch/watch_rtc.h
View File

@@ -21,44 +21,31 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _WATCH_RTC_H_INCLUDED
#define _WATCH_RTC_H_INCLUDED
#pragma once
////< @file watch_rtc.h
#include "watch.h"
#include "hpl_calendar.h"
#include "rtc.h"
/** @addtogroup rtc Real-Time Clock
* @brief This section covers functions related to the SAM L22's real-time clock peripheral, including
* date, time and alarm functions.
* @details The real-time clock is the only peripheral that main.c enables for you. It is the cornerstone
* of low power operation on the watch, and it is required for several key functions that we
* assume will be available, namely the wake from BACKUP mode and the callback on the ALARM button.
* It is also required for the operation of the 1 Hz tick interrupt, which you will most likely use
* to wake from STANDBY mode.
* assume will be available, namely waking on a press of the ALARM button. It is also required
* for the operation of the 1 Hz tick interrupt, which we use to wake from STANDBY mode.
*/
/// @{
extern watch_cb_t btn_alarm_callback;
extern watch_cb_t a2_callback;
extern watch_cb_t a4_callback;
#define WATCH_RTC_REFERENCE_YEAR (2020)
typedef union {
struct {
uint32_t second : 6; // 0-59
uint32_t minute : 6; // 0-59
uint32_t hour : 5; // 0-23
uint32_t day : 5; // 1-31
uint32_t month : 4; // 1-12
uint32_t year : 6; // 0-63 (representing 2020-2083)
} unit;
uint32_t reg; // the bit-packed value as expected by the RTC peripheral's CLOCK register.
} watch_date_time;
typedef enum watch_rtc_alarm_match {
ALARM_MATCH_DISABLED = 0,
ALARM_MATCH_SS,
ALARM_MATCH_MMSS,
ALARM_MATCH_HHMMSS,
} watch_rtc_alarm_match;
#define watch_date_time rtc_date_time
/** @brief Called by main.c to check if the RTC is enabled.
* You may call this function, but outside of app_init, it should always return true.
@@ -73,20 +60,20 @@ bool _watch_rtc_is_enabled(void);
* 1 means 2021, 2 means 2022, etc. **You will be responsible for handling this offset in your code**,
* if the calendar year is needed for timestamp calculation logic or display purposes.
*/
void watch_rtc_set_date_time(watch_date_time date_time);
void watch_rtc_set_date_time(rtc_date_time date_time);
/** @brief Returns the date and time.
* @return A watch_date_time with the current date and time, with a year value from 0-63 representing 2020-2083.
* @return A rtc_date_time with the current date and time, with a year value from 0-63 representing 2020-2083.
* @see watch_rtc_set_date_time for notes about how the year is stored.
*/
watch_date_time watch_rtc_get_date_time(void);
rtc_date_time watch_rtc_get_date_time(void);
/** @brief Registers an alarm callback that will be called when the RTC time matches the target time, as masked
* by the provided mask.
* @param callback The function you wish to have called when the alarm fires. If this value is NULL, the alarm
* interrupt will still be enabled, but no callback function will be called.
* @param alarm_time The time that you wish to match. The date is currently ignored.
* @param mask One of the values in watch_rtc_alarm_match indicating which values to check.
* @param mask One of the values in rtc_alarm_match indicating which values to check.
* @details The alarm interrupt is a versatile tool for scheduling events in the future, especially since it can
* wake the device from all sleep modes. The key to its versatility is the mask parameter.
* Suppose we set an alarm for midnight, 00:00:00.
@@ -96,7 +83,7 @@ watch_date_time watch_rtc_get_date_time(void);
* In theory the SAM L22's alarm function can match on days, months and even years, but I have not had
* success with this yet; as such, I am omitting these options for now.
*/
void watch_rtc_register_alarm_callback(ext_irq_cb_t callback, watch_date_time alarm_time, watch_rtc_alarm_match mask);
void watch_rtc_register_alarm_callback(watch_cb_t callback, rtc_date_time alarm_time, rtc_alarm_match mask);
/** @brief Disables the alarm callback.
*/
@@ -109,7 +96,7 @@ void watch_rtc_disable_alarm_callback(void);
* disabled with either watch_rtc_disable_tick_callback() or watch_rtc_disable_periodic_callback(1),
* and will also be disabled when watch_rtc_disable_all_periodic_callbacks is called.
*/
void watch_rtc_register_tick_callback(ext_irq_cb_t callback);
void watch_rtc_register_tick_callback(watch_cb_t callback);
/** @brief Disables the tick callback for the given period.
*/
@@ -130,7 +117,7 @@ void watch_rtc_disable_tick_callback(void);
* the system will not have any way of telling you where you are within a given second; watch_rtc_get_date_time
* will return the exact same timestamp until the second ticks over.
*/
void watch_rtc_register_periodic_callback(ext_irq_cb_t callback, uint8_t frequency);
void watch_rtc_register_periodic_callback(watch_cb_t callback, uint8_t frequency);
/** @brief Disables the tick callback for the given period.
* @param frequency The frequency of the tick you wish to disable, in Hz. **Must be a power of 2**, from 1 to 128.
@@ -158,4 +145,3 @@ void watch_rtc_enable(bool en);
void watch_rtc_freqcorr_write(int16_t value, int16_t sign);
/// @}
#endif