Sensor Watch Simulator (#35)

* Put something on screen

* Use the 32bit watch_date_time repr to pass from JS

* Implement periodic callbacks

* Clear display on enabling

* Hook up watch_set_led_color() to SVG (green-only)

* Make debug output full-width

* Remove default Emscripten canvas

* Implement sleep and button clicks

* Fix time zone conversion bug in beats-time app

* Clean up warnings

* Fix pin levels

* Set time zone to browser value (if available)

* Add basic backup data saving

* Silence format specifier warnings in both targets

* Remove unnecessary, copied files

* Use RTC pointer to clear callbacks (if available)

* Use preprocessor define to avoid hardcoding MOVEMENT_NUM_FACES

* Change each face to const preprocessor definition

* Remove Intl.DateTimeFormat usage

* Update shell.html title, header

* Add touch start/end event handlers on SVG buttons

* Update shell.html

* Update folder structure (shared, simulator, hardware under watch-library)

* Tease out shared components from watch_slcd

* Clean up simulator watch_slcd.c inline JS calls

* Fix missing newlines at end of file

* Add simulator warnings (except format, unused-paremter)

* Implement remaining watch_rtc functions

* Fix button bug on mouse down then drag out

* Implement remaining watch_slcd functions

* Link keyboard events to buttons (for keys A, L, M)

* Rewrite event handling (mouse, touch, keyboard) in C

* Set explicit text UTF-8 charset in shell.html

* Address PR comments

* Remove unused directories from include paths

1 files changed, 195 insertions, 0 deletions

diff --git a/watch-library/hardware/watch/watch_rtc.c b/watch-library/hardware/watch/watch_rtc.c
new file mode 100644
index 00000000..14a968c4
--- /dev/null
+++ b/watch-library/hardware/watch/watch_rtc.c
@@ -0,0 +1,195 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "watch_rtc.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;
+
+bool _watch_rtc_is_enabled(void) {
+    return RTC->MODE2.CTRLA.bit.ENABLE;
+}
+
+static void _sync_rtc(void) {
+    while (RTC->MODE2.SYNCBUSY.reg);
+}
+
+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();
+}
+
+void watch_rtc_set_date_time(watch_date_time date_time) {
+    RTC->MODE2.CLOCK.reg = date_time.reg;
+    _sync_rtc();
+}
+
+watch_date_time watch_rtc_get_date_time(void) {
+    watch_date_time retval;
+
+    _sync_rtc();
+    retval.reg = RTC->MODE2.CLOCK.reg;
+
+    return retval;
+}
+
+void watch_rtc_register_tick_callback(ext_irq_cb_t callback) {
+    watch_rtc_register_periodic_callback(callback, 1);
+}
+
+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) {
+    // we told them, it has to be a power of 2.
+    if (__builtin_popcount(frequency) != 1) return;
+
+    // this left-justifies the period in a 32-bit integer.
+    uint32_t tmp = frequency << 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 = 1 << per_n;
+}
+
+void watch_rtc_disable_periodic_callback(uint8_t frequency) {
+    if (__builtin_popcount(frequency) != 1) return;
+    uint8_t per_n = __builtin_clz(frequency << 24);
+    RTC->MODE2.INTENCLR.reg = 1 << per_n;
+}
+
+void watch_rtc_disable_all_periodic_callbacks(void) {
+    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) {
+    RTC->MODE2.Mode2Alarm[0].ALARM.reg = alarm_time.reg;
+    RTC->MODE2.Mode2Alarm[0].MASK.reg = mask;
+    RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_ALARM0;
+    alarm_callback = callback;
+    NVIC_ClearPendingIRQ(RTC_IRQn);
+    NVIC_EnableIRQ(RTC_IRQn);
+    RTC->MODE2.INTENSET.reg = RTC_MODE2_INTENSET_ALARM0;
+}
+
+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;
+    uint16_t interrupt_enabled = RTC->MODE2.INTENSET.reg;
+
+    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;
+            }
+        }
+    } 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();
+        } else if (reason & RTC_TAMPID_TAMPID1) {
+            if (a2_callback != NULL) a2_callback();
+        } else if (reason & RTC_TAMPID_TAMPID0) {
+            if (a4_callback != NULL) a4_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;
+    }
+}
+
+///////////////////////
+// Deprecated functions
+
+void watch_set_date_time(struct calendar_date_time date_time) {
+    RTC_MODE2_CLOCK_Type val;
+
+    val.bit.SECOND = date_time.time.sec;
+    val.bit.MINUTE = date_time.time.min;
+    val.bit.HOUR = date_time.time.hour;
+    val.bit.DAY = date_time.date.day;
+    val.bit.MONTH = date_time.date.month;
+    val.bit.YEAR = (uint8_t)(date_time.date.year - WATCH_RTC_REFERENCE_YEAR);
+
+    RTC->MODE2.CLOCK.reg = val.reg;
+
+    _sync_rtc();
+}
+
+void watch_get_date_time(struct calendar_date_time *date_time) {
+    _sync_rtc();
+    RTC_MODE2_CLOCK_Type val = RTC->MODE2.CLOCK;
+
+    date_time->time.sec = val.bit.SECOND;
+    date_time->time.min = val.bit.MINUTE;
+    date_time->time.hour = val.bit.HOUR;
+    date_time->date.day = val.bit.DAY;
+    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;
+}