#include "watch_rtc.h"
-ext_irq_cb_t tick_callback;
+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;
return retval;
}
-void watch_register_tick_callback(ext_irq_cb_t callback) {
- tick_callback = callback;
+void watch_rtc_register_1Hz_callback(ext_irq_cb_t callback) {
+ watch_rtc_register_tick_callback(callback, 1);
+}
+
+void watch_rtc_disable_1Hz_callback() {
+ watch_rtc_disable_tick_callback(1);
+}
+
+void watch_rtc_register_tick_callback(ext_irq_cb_t callback, uint8_t period) {
+ // we told them, it has to be a power of 2.
+ if (__builtin_popcount(period) != 1) return;
+
+ // this left-justifies the period in a 32-bit integer.
+ uint32_t tmp = period << 24;
+ // now we can count the leading zeroes to get the value we need.
+ // 0x01 (1 Hz) will have 7 leading zeros for PER7. 0xF0 (128 Hz) will have no leading zeroes for PER0.
+ uint8_t per_n = __builtin_clz(tmp);
+
+ // this also maps nicely to an index for our list of tick callbacks.
+ tick_callbacks[per_n] = callback;
+
NVIC_ClearPendingIRQ(RTC_IRQn);
NVIC_EnableIRQ(RTC_IRQn);
- RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_PER7;
+ RTC->MODE2.INTENSET.reg = 1 << per_n;
+}
+
+void watch_rtc_disable_tick_callback(uint8_t period) {
+ if (__builtin_popcount(period) != 1) return;
+ uint8_t per_n = __builtin_clz(period << 24);
+ RTC->MODE2.INTENCLR.reg = 1 << per_n;
}
-void watch_disable_tick_callback() {
- RTC->MODE2.INTENCLR.reg = RTC_MODE2_INTENCLR_PER7;
+void watch_rtc_disable_all_tick_callbacks() {
+ RTC->MODE2.INTENCLR.reg = 0xFF;
}
void watch_rtc_register_alarm_callback(ext_irq_cb_t callback, watch_date_time alarm_time, watch_rtc_alarm_match mask) {
uint16_t interrupt_status = RTC->MODE2.INTFLAG.reg;
uint16_t interrupt_enabled = RTC->MODE2.INTENSET.reg;
- if ((interrupt_status & interrupt_enabled) & RTC_MODE2_INTFLAG_ALARM0) {
- if (alarm_callback != NULL) {
- alarm_callback();
+ if ((interrupt_status & interrupt_enabled) & RTC_MODE2_INTFLAG_PER_Msk) {
+ // handle the tick callback first, it's what we do the most.
+ // start from PER7, the 1 Hz tick.
+ for(int8_t i = 7; i >= 0; i--) {
+ if ((interrupt_status & interrupt_enabled) & (1 << i)) {
+ if (tick_callbacks[i] != NULL) {
+ tick_callbacks[i]();
+ }
+ RTC->MODE2.INTFLAG.reg = 1 << i;
+ break;
+ }
}
- RTC->MODE2.INTFLAG.reg = RTC_MODE2_INTFLAG_ALARM0;
- } else if ((interrupt_status & interrupt_enabled) & RTC_MODE2_INTFLAG_PER7) {
- if (tick_callback != NULL) {
- tick_callback();
- }
- RTC->MODE2.INTFLAG.reg = RTC_MODE2_INTFLAG_PER7;
} else if ((interrupt_status & interrupt_enabled) & RTC_MODE2_INTFLAG_TAMPER) {
+ // handle the extwake interrupts next.
uint8_t reason = RTC->MODE2.TAMPID.reg;
if (reason & RTC_TAMPID_TAMPID2) {
if (btn_alarm_callback != NULL) btn_alarm_callback();
}
RTC->MODE2.TAMPID.reg = reason;
RTC->MODE2.INTFLAG.reg = RTC_MODE2_INTFLAG_TAMPER;
+ } else if ((interrupt_status & interrupt_enabled) & RTC_MODE2_INTFLAG_ALARM0) {
+ // finally handle the alarm.
+ if (alarm_callback != NULL) {
+ alarm_callback();
+ }
+ RTC->MODE2.INTFLAG.reg = RTC_MODE2_INTFLAG_ALARM0;
}
}
date_time->date.month = val.bit.MONTH;
date_time->date.year = val.bit.YEAR + WATCH_RTC_REFERENCE_YEAR;
}
+
+void watch_register_tick_callback(ext_irq_cb_t callback) {
+ tick_callbacks[7] = callback;
+ NVIC_ClearPendingIRQ(RTC_IRQn);
+ NVIC_EnableIRQ(RTC_IRQn);
+ RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_PER7;
+}
* @param callback The function you wish to have called when the clock ticks. If you pass in NULL, the tick
* interrupt will still be enabled, but no callback function will be called.
*/
-void watch_register_tick_callback(ext_irq_cb_t callback);
+void watch_rtc_register_1Hz_callback(ext_irq_cb_t callback);
+
+/** @brief Disables the tick callback for the given period.
+ */
+void watch_rtc_disable_1Hz_callback();
+
+/** @brief Registers a "tick" callback that will be called at a configurable period.
+ * @param callback The function you wish to have called when the clock ticks. If you pass in NULL, the tick
+ * interrupt will still be enabled, but no callback function will be called.
+ * @param period The frequency of the tick in Hz. **Must be a power of 2**, from 1 to 128 inclusive.
+ * @note A 1 Hz tick (@see watch_rtc_register_1Hz_callback) is suitable for most applications, in that it gives you a
+ * chance to update the display once a second — an ideal update rate for a watch! If however you are displaying
+ * a value (such as an accelerometer output) that updates more frequently than once per second, you may want to
+ * tick at 16 or 32 Hz to update the screen more quickly. Just remember that the more frequent the tick, the more
+ * power your app will consume. Ideally you should enable the fast tick only when the user requires it (i.e. in
+ * response to an input event), and move back to the slow tick after some time.
+ *
+ * Also note that the RTC peripheral does not have sub-second resolution, so even if you set a 2 or 4 Hz interval,
+ * 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_tick_callback(ext_irq_cb_t callback, uint8_t period);
-/** @brief Disables the tick callback.
+/** @brief Disables the tick callback for the given period.
+ * @param period The frequency of the tick you wish to disable, in Hz. **Must be a power of 2**, from 1 to 128.
*/
-void watch_disable_tick_callback();
+void watch_rtc_disable_tick_callback(uint8_t period);
+
+/** @brief Disables all tick callbacks.
+ */
+void watch_rtc_disable_all_tick_callbacks();
/** @brief Sets the system date and time.
* @param date_time A struct representing the date and time you wish to set.
__attribute__((deprecated("Use the watch_rtc_get_date_time function instead")))
void watch_get_date_time(struct calendar_date_time *date_time);
+/** @brief Registers a "tick" callback that will be called once per second.
+ * @param callback The function you wish to have called when the clock ticks. If you pass in NULL, the tick
+ * interrupt will still be enabled, but no callback function will be called.
+ */
+__attribute__((deprecated("Use the watch_rtc_register_1Hz_callback function instead")))
+void watch_register_tick_callback(ext_irq_cb_t callback);
+
/// @}
#endif
projects / sensor-watch.git / commitdiff