I have a bunch of ST7789 1" display modules, which I have been trying to make work with the lvgl_example.
First of all let me stress that I _KNOW_ the modules are working (they run fine with https://github.com/Bodmer/TFT_eSPI).
Also, I have a few ILI9341 modules and they work fine with the lvgl_example - so it is also not a build or flash issue.
In short - if I hook up the ILI9341 everything works - if I hook up the ST7789 display I simply get a blank screen.
A few things I have noticed. Unlike the ILI9341, the ST7789 module does not have a MISO signal, but I have tried not to connect the MISO on the ILI9341 and that still works fine. Second issue - the ST7789 does not have a CS signal. Reading up on esp-idf SPI it should be possible to set the CS to -1 and I have tried to modify the Kconfig.projbuild to allow -1 - that made no difference at all.
These modules are quite cheap and readily available so my question is - has anyone managed to make them work?
//Lars...
ST7789 Display Module not working
Re: ST7789 Display Module not working
I have to disappoint you, you won't find MISO and CS pins in I2C device and display from pictures is IIC standard.
Re: ST7789 Display Module not working
No, these are SPI even though they - if you read the labels - look like i2c. SDA is MOSI (see working initalization here: https://github.com/Bodmer/TFT_eSPI/blob ... 789_Init.h).
Re: ST7789 Display Module not working
Also documented in the datasheet of the display driver that it is in fact a SPI port https://www.rhydolabz.com/documents/33/ST7789.pdf.
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