[nrf52832] GC9A01 LCD output too slow

[cabin]

HI

I am developing an LCD using the GC9A01 module.
I implemented it by referring to the code as below and it works fine.

https://github.com/Exboom/GC9A01_nRF52

But the LCD screen is too slow. The screen is not displayed at once, but is output step by step.
Is there any way to speed it up?

Looking for data, it says to use QSPI or raise SPIM frequency, but it is nrf52532, so I can not use it all.

Please confirm.

[Kenneth]

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

[cabin]

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.

BR

Cabin

[Kenneth]

Hello,

Sorry no.

Kenneth

[xcodebyte]

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: [email protected]

Thank you.

[Kenneth]

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