Hello, I would like to understand the logic, on the board, I find 3 I2C ports:
I2C-0
I2C-1
I2C-10
When i make this:
I receive this
Code:
/dev/i2c-1 /dev/i2c-20 /dev/i2c-21
what exactly is the link?
Thank you in advance for your support.
that's 3 i2c bus interface by raspberry pi CM4.
i2c-0,1,2 just for our mark on PCB.
if you want to use i2c device extend GPIOs or sensor. please use I2C-1 port. just green terminal on the PCB.
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i2c-0: IDSDA,IDSCL default have connected with CSI0 and DSI0 camera and displayer.
IDSCL: (BCM2711 GPIO 1) GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to CM4_1.8V
ID_SDA: (BCM2711 GPIO 0) GPIO: typically a 3.3V signal, but can be a 1.8V signal by connecting GPIO_VREF to CM4_1.8V
--------------------------------------------------------------------
i2c-10:
SDA0: I2C Data pin (BCM2711 GPIO44): typically used for Camera and Display. Internal 1.8kΩ pull up to CM4_3.3V
SCL0: I2C clock pin (BCM2711 GPIO45): typically used for Camera and Display. Internal 1.8kΩ pull up to CM4_3.3V