Problem with ST7735S

[tbop-R]

Problem with ST7735S

[notro]

[ 78.364571] sunxi_spi_xfer_setup()1021 - [spi1] sunxi_spi_check_cs failed! spi_device cs =0 ...

I did a search for sunxi_spi_xfer_setup which gave me these:

https://github.com/allwinner-zh/linux-3.4-sunxi/blob/master/drivers/spi/spi-sunxi.c#L833-L837

(the source line 1021 doesn't match so you're using some other version of this driver)

https://github.com/allwinner-zh/linux-3.4-sunxi/blob/master/drivers/spi/spi-sunxi.c#L773-L775

It looks like for you CS0 is not in the supported cs_bitmap.
I have never used sunxi so I suggest you try a sunxi forum to get help with this error.

[tbop-R]

Thank you for answering me.
I ran modprobe changing the parameters:
sudo modprobe fbtft_device custom name=fb_st7735r gpios=dc:3,reset:0 speed=16000000 rotate=90
in dmesg I find no errors and the file /dev/fb1 is created.
The screen remains blank.
How can I test it?

Thank you

[notro]

A simple way is to dump some random pixels to the display: cat /dev/urandom > /dev/fb1
(ignore the no space left error)

[github-actions]

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