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I²C interfacing

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Published in 2015-5-11 01:35:38 | Show all floors |Read mode
Edited by gaara at 2015-5-10 19:34

Hi all,

I'm trying to learn about I2C interface on orange pi; because all is not clear for me.

I know there's
  • SDA (Serial Data Line)
  • SCL (Serial Clock Line)
  • +3.3V
  • GND
I know also that I2C is called asso TWI. So I have read the range datasheet, and I see this (image)

But: does SCK and SCL the same thing ?
In this case, can we plug 3 I²C differents devices ?

Thanks

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Published in 2015-5-11 02:19:26 | Show all floors
I2C and TWI is the same
But: does SCK and SCL the same thing ?

No
SCL is the Clock from I2C/TWI, SCK is the Clock from SPI

In this case, can we plug 3 I²C differents devices


Yes ... with the (old) 7bit up to 112 devices. With same devices max 8 on one I2C Bus (the last three adressbits must be set over Jumper or Dip)

With the newer 10 bit I2C Bus up to 1136 devices

regards

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 Author| Published in 2015-5-11 02:42:14 | Show all floors
Edited by gaara at 2015-5-10 21:03

Ok thanks.
But where are the SCL bus in the Orange ?
The documentation is a little poor...
If ti's the same as RPi:


Correct ?

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Published in 2015-5-11 12:21:03 | Show all floors
yes, correct. You can stick to Rpi's manual.

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 Author| Published in 2015-5-11 16:38:05 | Show all floors
Ok, thanks. I will try like this

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Published in 2015-9-3 18:52:04 | Show all floors
Well, if that semi-clear with pinout, what to do with that from programming side - on Raspbian on H3 CPU (Mini 2) device?
As I understand there shoud be some kernel support for that, but rasbperry docs calls it bcmXXX_i2c , and it will not work on H3 CPU, I bet.

I have some small OLED I2C display to play with.
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