I2C and SPI pinout

[Maksim Davletchin]

Hello. Because of bad CB1 eMMC board manual, and very incompetent and formal tech support (they approve that their boards can only be used for 3D printers🤦🤣) I don't understand, what pins (GPIOs) of CB1 eMMC board are used for I2C and SPI interfaces. And what pins will correspond to I2C and SPI interfaces in armbian-config -> System -> Hardware? I tried to test the board with the Pi4b_Adapter, but as I understood from pinout in the manual for the adapter (the pins for I2C 3 and 5) don't work with CB1 (NC - not connected), it works only with CM4. Does anyone know what other I2C pins are exposed on the adapter board?

I plan to use the CB1 board as a platform for my projects.

 

Здравствуйте. Из-за слабой документации на плату CB1 eMMC и некомпетентной и формальной техподдержки (которая утверждала, что их платы могут использоваться только для 3d принтеров🤦🤣) я не могу разобраться, какие выводы платы соответствуют интерфейсам I2C и SPI в armbian-config -> System -> Hardware. Я попробовал протестировать плату через адаптер Pi4b_Adapter, но, как я понял из распиновки в мануале, выводы 3 и 5 для I2C - не подключены, они могут использоваться только с платой Raspberry CM4. Может быть кто-то знает, какие другие выводы I2C выведены на плату адаптера и их можно использовать? 

Плату CB1 планирую использовать как платформу для своих проектов.

Edited September 24 by Maksim Davletchin

[Maksim Davletchin]

In dts file I found pins for i2c0-pi (PI6, PI7) and i2c4-ph (PH6, PH7). These are pins, that I can use from 40 Pin GPIO (CB1 eMMC + Pi4B Adapter). I activate it in armbian-config.

 

nano /boot/armbianEnv.txt :

->

verbosity=1
bootlogo=false
console=both
disp_mode=1920x1080p60
overlay_prefix=sun50i-h616
fdtfile=allwinner/sun50i-h616-bigtreetech-cb1-emmc.dtb
rootdev=UUID=a8678701-cc8d-475f-9c91-758f792917c9
rootfstype=ext4
overlays=i2c0-pi i2c4-ph
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u

 

Rebooting...

 

After asked enabled i2c buses:

i2cdetect -ls

->
i2c-0   i2c             mv64xxx_i2c adapter                     I2C adapter
i2c-1   i2c             DesignWare HDMI                         I2C adapter

 

Where is i2c-4 bus, that I choose in armbian-config??

 

Ok, I connect my devices with pins PI6 and PI7 (I tried to use PI6 as SDA, Pi7 as SCL, and vice versa),  when I ask i2c0 addresses, there are no my devices (my devices addresses are 0x20 and 0x48):

 

i2cdetect -y 0

->
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f 
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- UU -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

 

Only system device UU - 0x36

What's wrong?

 

P.S. Everything works with CM4  module.

Edited September 24 by Maksim Davletchin

[Maksim Davletchin]

Can anyone answer if this electronic waste works in any way? Or better to use normal pc like Raspberry cm4?

[JohnTheCoolingFan]

Sorry for the silence. I haven't dealt with such an issue, will see what I can do on my board, although I have just a BTT Pi 1.2. Maybe you need to load a device driver, like i2c-gpio.

 

I know about BTT's stance on support... Only what's needed for 3d printing and everything else goes on us.

[Maksim Davletchin]

@JohnTheCoolingFan, thanks for your reply. But, if I'm not mistaken, this is not a hardware but a software driver that creates a "virtual" i2c bus (which will consume cb1 resources). In my project i2c bus will be always busy and in pooling process, and I don't want to load the system