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DRIVERS.md: Doc ILI9486 COLOR_INVERT class variable.

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DRIVERS.md
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@ -641,7 +641,7 @@ If your display shows garbage, check the following (I have seen both):
## 3.4 Driver for ILI94xx ## 3.4 Driver for ILI94xx
This was developed for the ILI9486 but its application is more wide ranging. This was developed for the ILI9486 but its application is more wide ranging.
These have been tested: ILI9341, ILI9488 and HX8357D. In addition to ILI9486 tThese have been tested: ILI9341, ILI9488 and HX8357D.
The ILI9486 supports displays of up to 480x320 pixels which is large by The ILI9486 supports displays of up to 480x320 pixels which is large by
microcontroller standards. Even with 4-bit color the frame buffer requires microcontroller standards. Even with 4-bit color the frame buffer requires
@ -720,7 +720,16 @@ powered from 5V or 3.3V: there is a regulator on board.
def spi_init(spi): def spi_init(spi):
spi.init(baudrate=10_000_000) spi.init(baudrate=10_000_000)
``` ```
#### ILI9486 class variable
* COLOR_INVERT = 0
@beetlegig [reported](https://github.com/micropython/micropython/discussions/10511#discussioncomment-4833729)
inverted colors on an ILI9488 display. If black appears as white, and other
colors are incorrect, adapt the `color_setup.py` or `hardware_setup.py` to set
this to `0xFFFF`:
```python
from drivers.ili94xx.ili9486 import ILI9486 as SSD
SSD.COLOR_INVERT = 0xFFFF # Fix color inversion
```
The ILI9486 class uses 4-bit color to conserve RAM. See The ILI9486 class uses 4-bit color to conserve RAM. See
[Color handling](./DRIVERS.md#11-color-handling) for the implications of 4-bit [Color handling](./DRIVERS.md#11-color-handling) for the implications of 4-bit
color. On the Pico with the display driver loaded there was 85KiB free RAM color. On the Pico with the display driver loaded there was 85KiB free RAM