How to use I2C from application?

Luan Le

Other Parts Discussed in Thread: OMAP3530

Hi everyone,

I want to verify that I2C2 is working on my custom board. From a test application, I call CreateFile("I2C2:", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0) to get a handle. What can I do after that to talk to a part on the I2C bus? I seach the platform directory but do not see any IOCTL code that can be used to write or read data from the application.

I would be very thankful if you could give me some tips on how to set up the BSP and how to use the I2C bus.

Luan

over 15 years ago

0 Yebio Mesfin over 15 years ago

TI__Prodigy 180 points

Hi,

Which platfrom are using? In want send you sample test application for I2c we have.

Best Regards,

Yebio

0 Luan Le over 15 years ago in reply to Yebio Mesfin

Expert 2280 points

Hi Yebio,

I am using OMAP3530 with WinCE. Please send me the sample test application that you have. By the way, do I need to enable any flag in the BSP for it to work.

Thanks,

Luan

0 Yebio Mesfin over 15 years ago in reply to Luan Le

TI__Prodigy 180 points

Luan,

I am not able to attach the file here, can send me your email.

best regards

0 Luan Le over 15 years ago in reply to Yebio Mesfin

Expert 2280 points

My email is lle@newportmedical.com.

Thanks,

Luan

0 Yebio Mesfin over 15 years ago in reply to Luan Le

TI__Prodigy 180 points

Hi ,

Now the file is uploaded.

best regards,

Tux_I2C.zip

0 Luan Le over 15 years ago in reply to Yebio Mesfin

Expert 2280 points

Hi Yebio,

Thank you very much. I will give it a test soon.

I have WinCE BSP version 6.14.00. If I want to use I2C from a driver, can I call the functions from oal_i2c.c or i2c.cpp? I tried to call those in i2c.cpp but the code does not compile.

Thanks again for all your help,

Luan

0 DavidVescovi over 15 years ago in reply to Luan Le

Genius 5470 points

I have also been struggling trying to implement I2C from the application level. I noticed the test file that was attach by a TI guy has a call to setBaudRateIndex using the DeviceIoControl (IOCTRL_I2C_SET_BAUD_INDEX) this IOCTRL is not even implemented in the i2cproxy driver in any BSP version I have (6.14.1.1).

I assume TI is working from a later BSP release not yet public. I am assuming there must be an existing bug in the I2C driver as it stands now???

I can not get it to work even from the shell (do command) level using the ini2c and outi2c commands. (by the way the help description for these commands are labled wrong!)

0 DavidVescovi over 15 years ago in reply to DavidVescovi

Genius 5470 points

After implementing the new BAUD_INDEX IOCTRL all is working.

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How to use I2C from application?