rockbox/firmware/target/arm/as3525/sansa-clip
William Wilgus dcd71e66bd Optimize lcd-ssd1303 driver (clip series)
Saves 100+ bytes (50 of it in iram), saves a bit of power

Internal LCD clock decreased but with added efficiency of drawing routines
loses only around 2 Hz on the scanrate (~75Hz) while fps is slightly increased

Column offsets are now calculated outside the loops saving a few instructions

Passing a LCD_NOP command after lcd_update turns off Data/Cmd# gpio
saving a bit more power

Added a function lcd_write_cmd_triple() that allows 3 commands to be sent at once
when enabled with LCD_USE_FIFO_FOR_COMMANDS it sends them back to back without
checking FIFO status in between or sending to thhe D/C# Gpio.
Makes an assumption about the FIFO being large enough to
accept 3 commands after being emptied which should be the case on the
clipv1, clipv2, clipplus. I have only enabled it for the clip plus
as thats the only device I have to test it on.

On clip+ the SSP clock is now turned off when screen is off

Change-Id: Ib5fd24697bfe4ac8b8ee017361e789e4a7910d21
2018-07-26 04:23:28 +02:00
..
backlight-target.h
button-target.h
lcd-as-clip.S
lcd-clip.c Optimize lcd-ssd1303 driver (clip series) 2018-07-26 04:23:28 +02:00
powermgmt-clip.c