Hi,
I have an issue on MIPI Display with our custom board, information as below,
- Core: STM32U599NJH6
- Frame Buffer Address: 0x200D0000 (Internal SRAM)
- MIPI Driver : ST7797
- Resolution: 400*400
Reference example : STM32Cube_FW_U5_V1.6.0\ STM32U5x9J-DK\ DSI_VideoMode_SingleBuffer
I have noticed that example code is the same MIPI command and also LTDC timing as mine.
And I set as the same ,but still not display anything. So I checked few things,
- DSI_Dn/Dp signal in scope are the same polarity (It should be differential signal)
> PCB layout & Schematic both design in correct. And Dn/Dp is in correct impedance.
> There is a saying, no display or Black will show the same polarity, is it correct? - In example code, there are two different CMD(SetPanelConfig, mipi_config).
> After set with mipi_config, there is no change on display and same polarity.
> After set with SetPanelConfig, display appear stripe but same polarity.
If it is correct of my understanding, LP mode is for CMD configuration on level ~1.2V, HS mode is in data transfer for display on level ~200mV.
But as my measure, either same polarity or always on level 1.2V.
Is there anything I missed?
Any help will be appreciate~
Thanks.
