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How to get SPI0 working

Posted: Wed Oct 23, 2019 3:26 pm
by dusinnhht

I'd like to use SPI0 on the StereoPi. I use the standard and latest Raspbian. I enabled SPI with raspi-config and rebooted several times, but ls /dev/spi* doesn't give any result.
Then I enabled SPI1 (added dtoverlay=spi1-3cs to /boot/config.txt), and it seems to be working. (I now have /dev/spidev1.0, /dev/spidev1.1 and /dev/spidev1.2) Pinout is here:

Did anyone have any luck enabling SPI0?

Re: How to get SPI0 working

Posted: Wed Oct 23, 2019 9:07 pm
by dusinnhht
I just noticed, that SPI1 is in fact SPI0, at least it drives the pins for SPI0. It's weird, because when I connected SPI1's Mosi with Miso it passed the test. But what I connected to SPI1 bus didn't work, so I checked the other pins with oscilloscope and noticed that SPI0 pins are driven (also? I didn't check SPI1, just wanted to get over with the project, but I still dont have /dev/spidev0.*)

Re: How to get SPI0 working

Posted: Thu Oct 24, 2019 7:28 am
by Realizator
Hi dusinnhht,
Which pins are you using for SPI0?
If we'll look inside Compute Module datasheet, page 18 and 19, we can see that SPI0 can bu used either at GPIO 7-10 (ALT0), or at GPIO 35-39 (ALT0).
And if we'll look inside our device tree configuration (dt-blob.dts), we can see that some of these pins are used for the second camera control.

To check this hypothesis, please try to rename dt-blob.bin in your /BOOT partition and run your tests. With no dt-blob.bin our StereoPi will act exaxtly as a classic Raspberry Pi.
If this will work for you, we'll try to slightly modify dt-blob for you, to release the pins you need.