I2C touch driver

DavidVescovi

I have implemented a CE6 (A8 35xx 1.xx BSP) touch screen driver that uses the I2C (I2C channel 2) controller.

I am calling I2COpen and I2CRead and I2CWrite after setting up with I2CSetBaudIndex and I2CSetSlaveAddress etc.

I have noticed while this works for the most part, occasionally I'll get a:

Write: Attempts = 2
Write: Attempts = 3
Write: Attempts = 4
Write: Attempts = 5
WARN: I2C: Write failed (SA=0x48, register=0x00000000)

shortly after startup and I believe always on the first access or two.

I am wondering if this is the correct way to call the I2C operations from a touch driver or maybe I should be using the I2C proxy or something different.

over 13 years ago

0 1258021 over 13 years ago

Genius 5120 points

Hi David,

That is fine I guess. While ago when I used I2C bus for Audio Codec, before reading and writing I have to open the Codec, Set the Baud Rate and then perform read and write.

Regards,

GSR

0 DavidVescovi over 13 years ago in reply to 1258021

Genius 5470 points

I know the setup is correct.

My question is why the write always fails the first few times.

0 1258021 over 13 years ago in reply to DavidVescovi

Genius 5120 points

Hi,

We have used Mistral's Rev.G Hardware. When we remove and insert the SOM we use to see the same behaviour.

One possible reason might be SOM not inserted properly (If you are also using the concept of SOM on which processor is present) and a peripheral baord on which there will be peripherals related to your requirement.

I haven't debugged it further.

Thank You & Regards,

GSR

0 DavidVescovi over 13 years ago in reply to 1258021

Genius 5470 points

problem was on my end. Working fine now.

0 1258021 over 13 years ago in reply to DavidVescovi

Genius 5120 points

Just curious, may I know what is the problem.

Regards,

GSR

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I2C touch driver