I2C repeated start bit needs 1ms delay. Why and is it right?

[sindhuantony]

Hi, I am using a TQMAX6 module with IMX.6Dual core processor. My code kept crashing and restarting due to watchdog, but then again it was a repeated start until a delay of 1ms was introduced after the setting of RSTA bit in I2CR register of the I2C module.

There are 3 slaves connected. 

1. EEPROM

2. Temperature sensor

3. IOExpander

Is 1 ms too much of a delay? I found other sporadic crashes after this was done, although the initial crashing was solved after this. I am using a micrium OS, not LINUX. So please help me with an RTOS point of view.

Thanks,

Sindhu Antony

[art]

First, please carefully check your I2C code flowchart against the procedures, described in the Sections 35.5 "Initialization" and 35.6 "Software restriction" of the i.MX6Dual/Quad Reference Manual document, available on the processor's Documentation web page:

https://www.nxp.com/products/processors-and-microcontrollers/applications-processors/i.mx-applicatio...

From the hardware point of view, check the presence and the value of the I2C bus pull-up resistors (their typical value should be 4.7 to 10 kOhm).

Have a great day,
Artur

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