Add support for Sharp LS013B4DN04 memory display

[rm-hull]

Implementation Notes

• Available from: https://www.adafruit.com/product/1393
• Datasheet: https://www.sharpsma.com/documents/1468207/1485747/Memory+LCD+Theory%2C+Programming%2C+and+Interfaces
• App note: https://cdn.sharpsde.com/fileadmin/products/Displays/2016_SDE_App_Note_for_Memory_LCD_programming_V1.3.pdf
• Linked (original) issue: [feature request] support for Sharp memory LCD luma.core#113
• Code [WIP] on branch: feature/sharp-lcd
• Documentation preview: http://luma-lcd.readthedocs.io/en/feature-sharp-lcd/

Pinouts

LCD Pin	LCD Name	RPi Pin	RPi Function	Remarks
1	VIN	P01-01	3V3	3.3V Power
2	3V3	P01-01	3V3	3.3V Power
3	GND	P01-06	GND	Ground
4	SCLK	P0-23	GPIO 11 (SCLK)	Serial Clock
5	MOSI	P01-19	GPIO 10 (MOSI)	Serial Data
6	CS	P01-24	GPIO 8 (CE0)	Chip Select
7	EXTMD	P01-14	3V3	External mode (ON = external clock)
8	DISP	P01-16	GPIO 23	Display ON/OFF signal
9	EXTIN	P01-12	GPIO 18 (PWM0)	PWM clock - external clock when EXTMD = ON

[rm-hull]

References: http://www.makerdyne.com/blog/category/electronics/breakout-boards/

Well I have it working with some C code against my RPi-Zero from the above site:

Turns out it is 'not-quite' SPI in-as-much the chip select line is active high - normally CS is active low; not certain that the underlying py-spidev supports this, but at least it's some progress nonetheless.

cc: @Stefal

[CRImier]

I'm interested in adding support for Sharp Memory displays to luma.lcd, currently looking at the #63 code. Would such a contribution be interesting to upstream?

[thijstriemstra]

Would such a contribution be interesting to upstream?

I think so!