topic Re: 3-Wire SPI support on iMX6 (Linux) in i.MX Processors

3-Wire SPI support on iMX6 (Linux)

erezsteinberg — Mon, 20 Oct 2014 11:23:06 GMT

Hello experts,

I am connecting a peripheral to an iMX6S over a 3-Wire SPI interface (shared MOSI/MISO).

Do anyone know if SPI_3WIRE option is supported in iMX6 Linux SPI Driver?

If so, should we tie MOSI and MISO together via 10K resistors?

Regards,

Erez

igorpadykov — Mon, 20 Oct 2014 23:21:35 GMT

Hi Erez

no it is not supported.

Actually it is not difficult to realize it as spi bit bang.

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

erezsteinberg — Tue, 21 Oct 2014 07:27:17 GMT

Thanks Igor,

Just to clarify, the support is missing in the Linux driver implementation. It's not a h/w limitation...

(Bit-banging was my backup plan, so i'm not concerned about this too much).

Regards,

Erez

jamesdeepu — Sat, 09 May 2015 07:55:48 GMT

Dear Igor,

Is bitbanging required only if MOSI and MISO not connected via resistor ?

My SPI connection is shown below

Here SDO is connected to SDI via resistor on Slave side. Will that work out?.