Description

Most of the initialization code was copied from the ili9341 driver. However, the commands and parameters used in initialization sequence differs a lot, especially for power and frame control even if they have same command indices. See below for examples.

Note: I'm already working on a complete rework of the initialization which has been almost finished but it will require a couple of PRs to avoid extensive code duplication. I will use this issue as tracking issue.

• Move basic communication functions to lcd (PR drivers/lcd: code deduplication for st7735 and ili9341 #19816)
• Use a default _set_area function (PR drivers/lcd: code deduplication for st7735 and ili9341 #19816)
• Split the driver for supported ST77xx variants
• Fix initialization for ST7735
• Fix initialization for ST7789
• Fix initialization for ST7796

Examples for the problem

For example:

Although the command index is the same, the number of paraemeters and their meaning differ a lot.

Another example is:

In best case, the display uses wrong gamma correction and is completely overlit and without any contrast. In worst case, it doesn't work at all or breaks down the display. See below for expected and actual results.

Steps to reproduce the issue

Expected results

Actual results

Versions