iMX7D Cortex-M4 I2C isn't working properly

Technical Support
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1

Hello,

I’m having problems developing I2C for IMX7D Cortex-M4 using FreeRTOS. I started from the example provided by Toradex, available at:

I needed to make some changes to the original code because my i2c is on an alternate pin (ALT4 option).

The problem is:
When I execute a write command (I2C_XFER_Write), the program work properly and I can view the i2c signals on osciloscope. But, when I execute a read command (I2C_XFER_Read), I can’t see any signal on osciloscope (neither SCL or SDA) and no i2c interruption is generated on M4.

Is this a known issue?

Regards, Tolentino

Colibri iMX7D 512MB V1.1D

2

Hi @jvtolentin0 ,

Can you please share with us the changes to the code?

Also, did you remove these pins from the kernel device tree to prevent pins conflict?

Best regards,
Daniel Morais

3

Hi @daniel_m.tx !

The i2c pins were being reset by Linux. I removed the pins on linux devicetree and everything worked fine.

Thanks!

Best regards,
João Tolentino