Commit graph

104 commits

Author SHA1 Message Date
3b2bf1d967 Remove unnecessary memory for spash screen
When `lcd_fill(0x00)` is called before drawing the splash screen and
only a part of the image is stored as done now, some memory in the
`.bss` segment can be used for something else.
2021-03-01 16:45:03 +01:00
d14f1c33e0 Draw splash screen
Hail sacred chao, kallisti!
2021-02-27 15:17:01 +01:00
7f7d7b628a Interact with the display
Enable the SPI bus to configure the display and program its ram. For
that the fastest available SPI clock is used. To configure the display
a minimal config is used which is not identical but similar to the
displays datasheet. The display can only be filled columnwise so far.
2021-02-27 02:26:57 +01:00
0065fb630f Generate a PWM signal for the display
Generate a variable duty cycle PWM signal for the dimmable display
backlight at a frequency of 1.25kHz.

For demo und testing purposes PD5 is currently fading between 0 and
100%.
2021-02-19 15:46:36 +01:00