Sipdev0.1 missing

BPI-M2+/BPI-M2 Zero/BPI-P2 Zero
1

Hi. Im using bpi-m2p with armbian legacy OS.

I see /dev/spidev0.0 but I don’t see /dev/sipdev0.1

I checked the fex file (converting with bin2fex from /boot/script.bin) and I see

[spi0]
spi_used = 1
spi_cs_bitmap = 1
spi_mosi = port:PC00<3><default><default><default>
spi_miso = port:PC01<3><default><default><default>
spi_sclk = port:PC02<3><default><default><default>
spi_cs0 = port:PC03<3><1><default><default>

According to the fex guide (link) there can be a cs1 assignent. On the 40 pin connector SPI_CS1 should be on pin 26 GPIO07 which as per schematic is linked to cpu PIN PC7

I did try at first the following:

[spi0]
spi_used = 1
spi_cs_bitmap = 3
spi_mosi = port:PC00<3><default><default><default>
spi_miso = port:PC01<3><default><default><default>
spi_sclk = port:PC02<3><default><default><default>
spi_cs0 = port:PC03<3><1><default><default>
spi_cs1 = port:PC01<3><1><default><default>

Wich leads to even spidev0.0 missing. Checking the H3 chip datasheet (link) it appears PC7 does not support function 3 (page 74) as does instead PC3 as SPI0_CS

Then I thought, I can just use a regular output… so I tried any the following settings

spi_cs1 = port:PC01<1><default><default><1>
spi_cs1 = port:PC01<1><1><default><default>
spi_cs1 = port:PC01<0><1><default><default>
spi_cs1 = port:PC01<1><default><default><default>

In all thes esettings spidev0.0 appears but no spidev0.1

I use spi_cs_bitmap = 3 because should mean use cs0&2 but I also tried with value 1 and no changes…

Any idea? Can H3 use cs1 at all? Shoulnd’t any GPIO do? How to convince the OS to enable the second spi device?

Thanks! Ascanio

2

For anybody interested, I found the following thread with info on the subject:

Enjoy

Ascanio