[nrf52832] GC9A01 LCD output too slow

RE: [nrf52832] GC9A01 LCD output too slow

Kenneth — Mon, 16 Jun 2025 11:31:12 GMT

Hi,

Going back to the slow issue, can you try for the spi node in question to remove:

/delete-property/ zephyr,pm-device-runtime-auto;

Also, can you try to set:

CONFIG_SPI_NRFX_RAM_BUFFER_SIZE=255

Kenneth

RE: [nrf52832] GC9A01 LCD output too slow

xcodebyte — Mon, 16 Jun 2025 09:29:41 GMT

If you dont mind, can you share me your code base(base code) as the github code is not working for me in neither nrf52832 or nrf52840. I am really in need of it.

Also, I would like to know the pin connections you had done for the same.

email: xcodebytes24@gmail.com

Thank you.

RE: [nrf52832] GC9A01 LCD output too slow

Kenneth — Mon, 03 Apr 2023 10:10:34 GMT

Hello,

Sorry no.

Kenneth

RE: [nrf52832] GC9A01 LCD output too slow

cabin — Mon, 03 Apr 2023 08:54:06 GMT

Hello

Thank you for your reply.
However, it is not a specific delay issue. I am currently using SPI 8MHz. Using this at 4MHz makes it even slower. That's the whole slow problem. I would like to know if there is any solution for the same to increase the SPI rate to 32MHZ.

Cabin

RE: [nrf52832] GC9A01 LCD output too slow

Kenneth — Mon, 03 Apr 2023 07:21:16 GMT

Hello,

The nRF52832 support up to 8MHz on the SPIM, while the nRF52840 and nRF52833 support 32MHz.

I suggestr to get an nRF52840-DK and try for comparison. If it's smooth there, then you know what the problem is.

If you have a logic analyser trace of the SPI communication we can take a look at whether it looks okey (for instance to see if there are any delay's).

Best regards,
Kenneth