PN7462 I2C line hangs

[pratikyadav]

Hello,

We are using PN7462, It’s I2C line is connected to MAX77818 chip.

While MAX77818 chip low SDA line for a few milliseconds at that time if we try to read I2C line it fails(Due to interrupt). When we again try to read on I2Cline still it is not able to read I2Cline

If we deinit and init I2C line, it works fine for several times( approx 4-5 time) and after that facing the same issue.

API return with arbitration error (0x82).

Due to this error, we are not able to read on I2C line again. We have to restart the controller(PN7462).

Even if we add delay before I2C read still we are facing the same issue.

[pratikyadav]

Hello @Kan_Li ,

Any update regarding it?

[Kan_Li]

Hi @pratikyadav ,

Actually we provide I2CM demo code in PN7462AU_ex_phExHif, in which it uses phhalI2CM_Reset() for the Arbitration error of transmit or reception. Please kindly refer "/PN7462AU_ex_phExHif/src/phExHif_Hw.c" for more details.

Hope that helps,

Have a great day,
Kan

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[pratikyadav]

Hello @Kan_Li ,

I have tried phhalI2CM_Reset() in case of I2C failure, but still, we are not able to recover communication with the I2C line.

We are getting 138 (0x8A) errors continuously in the case of failure scenario.

Also, the observer that if we are deinit and init I2C, SDA line becomes low due to that I2C communication is not recovered.

[Kan_Li]

Hi @pratikyadav ,

It might be too early to conclude it is a PN7462 issue, would the SDA line be pulled low by MAX77818 device? Maybe you can try to configure the interface of I2C master as GPIO input in that case, and check if the SDA line is still low. Please kindly refer to the following for more details.

Have a great day,
Kan

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[pratikyadav]

hello @Kan_Li ,

Any update regarding it?

[Kan_Li]

Hi @pratikyadav ,

Is it possible to share your code for a review?

Have a great day,
Kan

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[pratikyadav]

hello @Kan_Li ,

Sorry, we can't share our code.

I am sharing the pseudo-code in which I have mentioned all details of the I2c init and failure scenario.

Let me know if you need further detail.