Inconsistency in I2C Interface

sachinmohankura — Mon, 14 May 2018 14:47:36 GMT

Hi,

We notice inconsistency in data received from touch controller.

We get valid data for few cycle
We get data read error for few touch input
We get NAK for data read from touch after address cycle.
We get ACK for the data but data read is FF all the time( here the I2C clock is held low for one or more cycle in between 8 bit read)

I have summarized all data in Touch panel I2C Issue.PPT and LA waveform capture(PNG Image).

Regards,

Sachin

Re: Inconsistency in I2C Interface

igorpadykov — Mon, 21 May 2018 02:10:47 GMT

Hi Sachin

issue may be caused by signals noise or operating systems delays, so one can try to

decrease operating i2c frequency, add delays and descrease pull resistors values.

May be recommended to try with baremetal sdk (or freertos)

Github SDK
https://github.com/backenklee/swp-report/tree/master/iMX6_Platform_SDK

Best regards
igor
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topic Re: Inconsistency in I2C Interface in i.MX Processors

Inconsistency in I2C Interface

Re: Inconsistency in I2C Interface