Inconsistency in I2C Interface

[sachinmohankura]

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

[igorpadykov · Accepted solution]

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