Data transfer using i2c

annapoorna g

Other Parts Discussed in Thread: CC2650

I was configuring proximity sensor TMD2672 with cc2650 launch pad using i2c interface, and i am unable to read sensor data from the buffer. I have included the code that uses i2c.h as source code.

Kindly resolve at the earliest.

handle = I2C_open(Board_I2C0, &params);

i2cTrans.writeCount = 0;
i2cTrans.writeBuf = txBuf;
i2cTrans.readCount = 1;
i2cTrans.readBuf = rxBuf;
i2cTrans.slaveAddress = 0x39;

I2C_transfer(handle, &i2cTrans);

over 9 years ago

0 Christin Lee over 9 years ago

TI__Guru 56975 points

did you get a valid handle in return? You need to use logic analyzer so that we can help you. We don't have the HW you have. To better assist you, please check
1. do you have valid handle in return?
2. is the I2C transfer successful?
3. provide logic analyzer trace.

0 YiKai Chen over 9 years ago

Guru 735695 points

If you use oscilloscope to check I2C SCL pin, do you see clock on it?

0 annapoorna g over 9 years ago in reply to Christin Lee

Prodigy 200 points

Actually even , I don't have logic analyzer here.

According to variables watch tab from CCS debug , i am getting a handle in return , below is the copy it .

Expression type value address
handle struct I2C_Config * 0x00007584 0x20000220

And I2C transfer is also returning me true value itself.

0 YiKai Chen over 9 years ago in reply to annapoorna g

Guru 735695 points

It will return true if I2C signal is sent by driver correctly. However, you have to make sure I2C command is correct for I2C slave device by yourself in application.

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Data transfer using i2c