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, 85 insertions, 0 deletions

diff --git a/watch-library/shared/watch/watch_extint.h b/watch-library/shared/watch/watch_extint.h
new file mode 100644
index 00000000..452461b3
--- /dev/null
+++ b/watch-library/shared/watch/watch_extint.h
@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+#ifndef _WATCH_EXTINT_H_INCLUDED
+#define _WATCH_EXTINT_H_INCLUDED
+////< @file watch_extint.h
+
+#include "watch.h"
+#include "hal_ext_irq.h"
+
+/** @addtogroup buttons Buttons & External Interrupts
+  * @brief This section covers functions related to the three buttons: Light, Mode and Alarm, as well as
+  *        external interrupts from devices on the nine-pin connector.
+  * @details The buttons are the core input UI of the watch, and the way the user will interact with
+  *          your application. They are active high, pulled down by the microcontroller, and triggered
+  *          when one of the "pushers" brings a tab from the metal frame into contact with the edge
+  *          of the board. Note that the buttons can only wake the watch from STANDBY mode, at least as
+  *          of the current SAM L22 silicon revision. The external interrupt controller runs in STANDBY
+  *          mode, but it does not run in BACKUP mode; to wake from BACKUP, buttons will not cut it.
+  */
+/// @{
+
+///@brief An enum defining the types of interrupt trigger you wish to scan for.
+typedef enum watch_interrupt_trigger {
+    INTERRUPT_TRIGGER_NONE = 0,
+    INTERRUPT_TRIGGER_RISING,
+    INTERRUPT_TRIGGER_FALLING,
+    INTERRUPT_TRIGGER_BOTH,
+} watch_interrupt_trigger;
+
+/// @brief Enables the external interrupt controller.
+void watch_enable_external_interrupts(void);
+
+/// @brief Disables the external interrupt controller.
+void watch_disable_external_interrupts(void);
+
+/** @brief Configures an external interrupt callback on one of the external interrupt pins.
+  * @details You can set one interrupt callback per pin, and you can monitor for a rising condition,
+  *          a falling condition, or both. If you just want to detect a button press, register your
+  *          interrupt with INTERRUPT_TRIGGER_RISING; if you want to detect an active-low interrupt
+  *          signal from a device on the nine-pin connector, use INTERRUPT_TRIGGER_FALLING. If you
+  *          want to detect both rising and falling conditions (i.e. button down and button up), use
+  *          INTERRUPT_TRIGGER_BOTH and use watch_get_pin_level to check the pin level in your callback
+  *          to determine which condition caused the interrupt.
+  * @param pin One of BTN_LIGHT, BTN_MODE, BTN_ALARM, A0, A1, A3 or A4. If the pin parameter matches one of
+  *            the three button pins, this function will also enable an internal pull-down resistor. If
+  *            the pin parameter is A0-A4, you are responsible for setting any required pull configuration
+  *            using watch_enable_pull_up or watch_enable_pull_down.
+  * @param callback The function you wish to have called when the button is pressed.
+  * @param trigger The condition on which you wish to trigger: rising, falling or both.
+  * @note Pins A2 and A4 can also generate interrupts via the watch_register_extwake_callback function, which
+  *       will allow them to trigger even when the watch is in deep sleep mode.
+  * @warning As of now, A2 is not usable via the watch_register_interrupt_callback function. To enable an
+  *          external interrupt on pin A2, use the watch_register_extwake_callback function. This issue will be
+  *          addressed in a future revision of the watch library.
+  */
+void watch_register_interrupt_callback(const uint8_t pin, ext_irq_cb_t callback, watch_interrupt_trigger trigger);
+
+__attribute__((deprecated("Use watch_register_interrupt_callback or watch_register_extwake_callback instead")))
+void watch_register_button_callback(const uint8_t pin, ext_irq_cb_t callback);
+
+__attribute__((deprecated("Use watch_enable_external_interrupts instead")))
+void watch_enable_buttons(void);
+/// @}
+#endif