ESP8266 + ILI9341 - readRegister() / readRect() failed

[sfxsfl]

Hi Bodmer,
once again kudos for you and your great work on TFT_eSPI. It's working amazingly fast and robust.

Currently I'm trying to use readRect in conjunction with pushRect function to save a small area
on my display - unfortunately without success.

I've tried to use the readRegister() example from one of the provided examples with the following output.

---- Register ----
Register 0x04: 0x00000000
Register 0x09: 0xFFFFFFFF
Register 0x0A: 0x000000FF
Register 0x0B: 0x00000000
Register 0x0C: 0x00000000
Register 0x0F: 0x000000FF
Register 0x2E: 0x00000000
Register 0xDA: 0x00000000
Register 0xDB: 0x00000000
Register 0xDC: 0x00000000
Register 0xDD: 0x000000FF
Register 0xD3: 0x00FFFFFF

So I'll guess it's a problem reading values from the ILI9341 back. Any suggestion if I have missed
something ? Is this a know issue, while using TFT_SPI_OVERLAP ?

I'm using the following configuration in my user_setup.h

#define ILI9341_DRIVER // Generic driver for common displays
#define TFT_SPI_OVERLAP

// In ESP8266 overlap mode the TFT chip select MUST connect to pin D3
#define TFT_CS PIN_D3
#define TFT_DC PIN_D1
#define TOUCH_CS PIN_D4 // Chip select pin (T_CS) of touch screen

Thanks in advance
Stefan

[sfxsfl]

[sfxsfl]

Maybe the problem is related to the wiring and the related CS Signals. Help will be highly appreciated ... Thanks in advance Stefan

[sfxsfl]

Has anyone tried to read Display registers while using SPI Overlap mode ??? I'm still struggling with this issue ...

Thanks in advance
Stefan

[Bodmer]

Unfortunately reads in overlap mode are not supported by the library. It may be posible to add this but lack of time means I am not able to do this:
https://github.com/Bodmer/TFT_eSPI/blob/master/Processors/TFT_eSPI_ESP8266.c#L43

[sfxsfl]

Hi Bodmer, thanks a lot for the swift reply and I fully understand that you won't have time for the implementation. I have a one final question on this topic. Does that mean uint8_t TFT_eSPI::readcommand8(uint8_t cmd_function, uint8_t index) won't work, too ?

Thanks a lot for the clarification in advance
Stefan