ST7789 Displaying 320x240 Resolution NRF5SDK

RE: ST7789 Displaying 320x240 Resolution NRF5SDK

Edvin — Wed, 03 Apr 2024 11:46:34 GMT

I guess it is some buffer size that rolls over. The driver found in the sample is just an example on how to do it.

Are you using SPI in your application? If so, there is a "bug" in the SPI driver where the buffer size is using a uint8_t for length. This was written when the nRF52832 was the only nRF52 device, and this has a hardware SPI with only 256 bytes (so 8 bits buffer length. 0xFF = 255)

All the other nRF5 devices (I think) has 16 bit buffer lengths, so the buffer can be a lot longer. I don't know what nRF5 device you are using, but if it is the nRF52840, then you can go into the nrf_drv_spi.c/h and change the lengths from uint8_t to uint16_t, and see if that helps.

Best regards,

Edvin

RE: ST7789 Displaying 320x240 Resolution NRF5SDK

bsarica — Tue, 02 Apr 2024 14:06:29 GMT

Hi Edvin,

The issue is that I can able to perform increasing in the width and height up to 255. In each change in the height or width between 0-255 is observable from the LCD Screen. However, If I tried to increase the height or width above the 255, LCD Display rendering area shrinks into much more smaller value (Observable on the LCD). I was giving the 266 as an example for the demonstrate the shrinking with the numbers, it was not the function return or else.

Thank you

RE: ST7789 Displaying 320x240 Resolution NRF5SDK

Edvin — Tue, 02 Apr 2024 13:58:57 GMT

[quote user="bsarica"] I cannot able to find the function that returns 10.[/quote]

Then how do you determine that it returns 10?

[quote user=""] (instead of 266, it returns 10).[/quote]

Or did I misunderstand this?

RE: ST7789 Displaying 320x240 Resolution NRF5SDK

bsarica — Thu, 28 Mar 2024 05:07:01 GMT

Hi Edvin, Yes I am using nRF5 SDK. In the sdk.config file there is a macros for ST7735_WIDTH and ST7735_HEIGHT. I can increase these numbers upto 255, even though it says the maximum supported resolution is 160x128. I cannot able to find the function that returns 10. However, I can able to see the height and width settings from the LCD Screen. Whenever it reaches out from the 255, display shrinks into the modulus of 256 (I believe). I also configured the as 320x240 in the st7735 .c file from looking AdaFruit's ST7789 Library. Here is below.

write_command(ST7735_CASET);
write_data(0x00);
write_data(0x02);
write_data(320>>8);
write_data(320 && 0xff);
write_command(ST7735_RASET);
write_data(0x00);
write_data(0x01);
write_data(0x00);
write_data(240);

Thank you in advence

RE: ST7789 Displaying 320x240 Resolution NRF5SDK

Edvin — Wed, 27 Mar 2024 10:24:22 GMT

Hello Buğra,

What function is it that returns 10? Are you using the nRF5 SDK or the nRF Connect SDK? (I see that your tag in the ticket says "nRF5 sdk", but I want to make sure.

[quote user=""]I think that because of the limitation of uin8_t but height and width are uint16_t.[/quote]

Again, can you please point to the file that you refer to here? I am not sure what to look for.

Best regards,

Edvin

RE: ST7789 Displaying 320x240 Resolution NRF5SDK

azwin — Wed, 27 Mar 2024 05:57:45 GMT

#ifndef ST7735_HEIGHT
#define ST7735_HEIGHT 160
#endif

#ifndef ST7735_WIDTH
#define ST7735_WIDTH 128
#endif .

you can define 160x128 as ST supports this resolution . in SDK.config