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

watch-library/hardware/hal/documentation/slcd_sync.rst

@@ -0,0 +1,82 @@
+
+SLCD Synchronous driver
+=======================
+
+An LCD display is made of several segments (pixels or complete symbols) which
+can be block light or let light through. In each segment is one electrode
+connected to the common terminal (COM pin) and one is connected to the segment
+terminal (SEG pin). When a voltage above a certain threshold level is applied
+across the liquid crystal, it will change orientation and either let light
+through or block it.
+
+The driver supports segment on/off/blink, animation and character display.
+
+Each segment has a unique int32 segment id which is used by the driver. The id is
+combined by common number(COM) and segment number(SEG), the COM and SEG start from 0.
+The unique segment id is calculated by this formula: (COM << 16) | SEG
+For example a 8(coms)*8(segments)SLCD, the unique segment id for segment should be
+
+    +-----+-----+---------+
+    | COM | SEG |   ID    |
+    +-----+-----+---------+
+    |  0  |  0  | 0x00000 |
+    +-----+-----+---------+
+    |  1  |  0  | 0x10000 |
+    +-----+-----+---------+
+    |  7  |  7  | 0x70007 |
+    +-----+-----+---------+
+
+Segment ID can be calculated using the pre-defined macro SLCD_SEGID(com, seg).
+
+For character display, the "segment character mapping table" and "character mapping table"
+should be setup in configuration. The driver have no API to setup/change those
+mapping setting.
+There are two pre-defined "segment character mapping table" in this driver, 7 segments
+and 14 segments. The 7 segment character mapping can display 0-9 and a-f, the 14
+segments character mapping can display 0-9, A-Z and some special ASCII, for more
+details please refer to hpl_slcd_cm_7_seg_mapping.h and hpl_slcd_cm_14_seg_mapping.h.
+Application can also adjust this mapping table in the configuration header file,
+to add more character mapping or remove some unused character.
+
+The "character mapping" is used to setup each character in SLCD display screen.
+The driver supports multiple character mapping, the max number varies on different
+MCU/MPU. For example if an LCD display screen has five "7-segments character" and
+eight "14-segments character", and the MCU support max 44 characters setting, then
+the 13 character should be setup in configuration. Application can select any
+position from those 44 characters setting to save those 13 character.
+The index of character setting will be used in the driver API. For example:
+five "7-segments character" setting to 0 to 4 and eight "14-segments character" setting
+to 10 to 17. Then the application can use index from 0 to 4 to display the
+"7-segments character" and use index from 10 to 14 to display "14-segments character".
+
+Features
+--------
+
+* Initialization and de-initialization
+* Enabling and Disabling
+* Switching segment on/off
+* Set segment blink
+* Autonomous animation
+* Character display
+
+Applications
+------------
+* SLCD display control, segment on/off/blink
+* Play battery animation, running wheel, wifi signal, etc.
+* Display Time Clock by 7 segments character mapping
+* Display ASCII character by 14 segments character mapping
+
+Dependencies
+------------
+* SLCD capable hardware
+
+Concurrency
+-----------
+N/A
+
+Limitations
+-----------
+
+Known issues and workarounds
+----------------------------
+N/A