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author | Alexsander Akers <me@a2.io> | 2022-01-25 15:03:22 -0500 |
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committer | GitHub <noreply@github.com> | 2022-01-25 15:03:22 -0500 |
commit | b8de35658ffd78ad8b22f91ccbbd3d63663afda9 (patch) | |
tree | 1f265ddfcc8e5abf0316b81b15f80bf5c70fa7b7 /watch-library/hardware/hal/documentation/slcd_sync.rst | |
parent | 9e24f6c336773c7404139ab4db0eaab2f99504e2 (diff) | |
download | Sensor-Watch-b8de35658ffd78ad8b22f91ccbbd3d63663afda9.tar.gz Sensor-Watch-b8de35658ffd78ad8b22f91ccbbd3d63663afda9.tar.bz2 Sensor-Watch-b8de35658ffd78ad8b22f91ccbbd3d63663afda9.zip |
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
Diffstat (limited to 'watch-library/hardware/hal/documentation/slcd_sync.rst')
-rw-r--r-- | watch-library/hardware/hal/documentation/slcd_sync.rst | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/watch-library/hardware/hal/documentation/slcd_sync.rst b/watch-library/hardware/hal/documentation/slcd_sync.rst new file mode 100644 index 00000000..e18aa9dd --- /dev/null +++ b/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 |