LAUNCHXL-CC2650: Issue in I2C read

Pavankumar SR

I am working on Contiki sw stack.

Here,I am trying to interface with sdp810 differential pressure sensor using "I2C" here I am able to write the command (0x36,0x1E)to the register as I have checked the status in i2c_status() in board_i2c.c, here "status = ti_lib_i2c_master_err(I2C0_BASE);" writtens status = 0

but when I am trying to read by calling "board_i2c_read(...)" "status" gives me '4' so that is why I am not able to read data what might be the problem, how to resolve this.

Is it the sensor problem?

thank you

over 8 years ago

0 TA12012 over 8 years ago

TI__Mastermind 36415 points

Pavankumar,

I suggest that you confirm the I2C signals on your HW using an oscilloscope. I2C is susceptible to noise and cross talk due to the fact its a multi drop architecture.

Regards,
/TA

0 YiKai Chen over 8 years ago

Guru 735695 points

I suggest you to check if you see clock signal on I2C SCL pin first when you call board_i2c_read.

0 Pavankumar SR over 8 years ago in reply to YiKai Chen

Expert 1685 points

Ok thank you It worked:)

I have a querry on udp-client and udp-server example
since it works on 6Lowpan how can I tell that it works under 6Lowpan technology

When sending udp packet from client to server on what basis client will send data to server
since we are not assigning any server IP address how can it send data to the server?
I wanted to know how data will be sent in simple words

thank you

0 YiKai Chen over 8 years ago in reply to Pavankumar SR

Guru 735695 points

If UDP server/client works, you will see “Hello “ print on terminal which you can refer to sunmaysky.blogspot.tw/.../how-to-run-contiki-udp-serverudp-client.html

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LAUNCHXL-CC2650: Issue in I2C read