spi(oled) operation is not working well on nrf52840

[schosdas]

Hello

I want to operate SSD1331 OLED(96*94) using sdk v17.0.2 and nrf52840 custom board.

The OLED example of sdk v15 was replaced with the codes of sdk17 and tested on the nrf52dk board.  I tried to test the nrf52840 but it didn't work at all and debugging didn't detect any errors.

The pins I used are as follows.

.scl_pin = 24
.sda_pin = 23
.res_pin = 22
.dc_pin = 20
.cs_pin = 19

The same is true of the default example of unmodified sdk15. (but good in nrf52dk)

I think the SPI codes for nrf52832 and nrf52840 are the same, so is there a mistake in pin placement?

I'm attaching my project file.

Thank you.

2465.spi_ssd1331.zip

[Eugene Yu]

Hello,

The pins you used are already configured by PCA10056.h for external memory, buttons, and others.

So I recommend using other pins rather than the PC10056 configuration if you want to test on nRF52840-DK.

Please refer to the nRF52840-DK hardware drawing.

Thanks.

[schosdas]

Hello, thank you for your answer!

As I connected the pin connection on the custom board exactly like the dk board, there was a mistake. I checked the circuit diagram and datasheet and fixed the pin connection, and the problem was solved!

I've wasted a lot of time on this little mistake....