Newbee I2C questions

[espruino-discuss3]

Posted at 2014-06-26 by user7114

Due to I2C addressing device conflicts, I need 2 I2c buses in my program.

Question #1: Can I used (both) two I2C buses (B6 B7) & (B7 B8) ?
If possible, state the instances I can use for both buses.

Question #2: I2C Class shows instances of I2C1,I2C2&I2C3
and since the Espruino has just 2 buses (I2C1 & I2C2) that can
be used BUT the software rejects using I2C2 but likes only I2C1?

Question #3: The Espruino board layout pins only
shows "same" I2C1 on both pins (B6 B7) and (B8 B9)?

Windows 8.1 64 Bit
Chrome 35.0.1916.153 m (no beta)
Espruino 1v65
Web-IDE v 44
Board: Espruino

[espruino-discuss3]

Posted at 2014-06-26 by @gfwilliams

Question #1: Can I used (both) two I2C buses (B6 B7) & (B7 B8) ?

Yes, but you'll have to use I2C1.setup to set up I2C each time you want to use the other bus (I guess you mean you mean B6/B7 + B8/B9).

I'd strongly recommend that you just use I2c2 on B10 and B11.

I2C Class shows instances of I2C1,I2C2&I2C3

I2C3 is for other chips/boards that have it - the Espruino board doesn't.

software rejects using I2C2 but likes only I2C1?

Do you have an example of what doesn't work? I2c2 definitely should be fine.

The Espruino board layout pins only shows "same" I2C1 on both pins (B6 B7) and (B8 B9)?

It can be on B6/B7 or B8/B9 and is configurable by I2C1.setup - but it can't be on both at the same time, and it can't be on B6/B9 (for instance)

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Posted at 2014-06-27 by user7114

I'd strongly recommend that you just use I2c2 on B10 and B11.

Any particular reason why?

BTW ... I think I resolved the I2C pins.
I2c1 is used only for B6/7 or B8/9
I2C2 is used only for B10/11
Both I2C buses can used separately or together. (AND)

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Posted at 2014-06-27 by @gfwilliams

Yes - that's correct.

What I meant was: if you need 2 I2C busses then use I2C1 and I2C2 together rather that trying to set up I2C1 to swap between B6/7 and B8/9. It's quicker and simpler than having to use I2C.setup each time.

I'm not sure if you need to use 2 busses anyway... The idea of the bus is that you can connect more than one device to it - the only time you'd need two is if you have two devices with the same address.

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Posted at 2014-06-27 by user7114

Due to I2C addressing device conflicts, I need 2 I2c buses in my program.