RE: Something was wrong when I driver LCD(ili9486) with SPIM3?

IAMLIUBO — Mon, 23 Mar 2020 07:11:41 GMT

Hi,

Thanks for relpy me.

1.I use the nrfx_spim example to do this project,I think the SPIM3 configured is right.Is there anything that needs special attention?

2.Sorry, I didn't have logic analyzer,but I use the spi without DMA,It can be work,and works well.

Thanks for help me again,I will keep trying it. In fact, I was porting littleVGL to nrf52840, but because the SPI transmitted too few bytes at a time, the refresh effect was too poor, so I started to try SPIM, but found that it was not as smooth as SPI.

Have a nice day!

RE: Something was wrong when I driver LCD(ili9486) with SPIM3?

Jørgen Holmefjord — Mon, 16 Mar 2020 14:29:01 GMT

Hi,

1. I tested setting the DCX pin to NRF_GPIO_PIN_MAP(1,8) in the nrfx_spim example in the SDK, this works fine. I also tested that the pin toggles by reducing the last parameter to nrfx_spim_xfer_dcx() from 15 to 5:

Are you sure that you have configured the driver correctly to use SPIM3? SPIM3 is the only instance that supports DCX functionality and HW SS control.

2. It is hard to say what goes wrong here. Unfortunately, I do not have any display to test your code with. Have you checked the bytes sent on the bus with a logic analyzer and compared this to the command set described in the LCD datasheet?

Best regards,
Jørgen