LAUNCHXL-F28P65X: Trigger interrupt for 1 byte without using Loopback Mode for I2C

Rodali Hazarika

Part Number: LAUNCHXL-F28P65X
Other Parts Discussed in Thread: C2000WARE

Tool/software:

I am working with the i2c_ex1_loopback.c example from C2000Ware (using FIFO interrupts without loopback mode turned on) in TI LaunchPad F28P65x C2000 real time MCU. I'm facing an issue where the I2C RX FIFO interrupt is not triggered for the 1st 2 bytes transmitted. As a result, the rData[] buffer is not getting populated correctly for the first two entries (rData[0] and rData[1] remain 0). The rest of the previous 2 bytes data appears to be received correctly after that. Any suggestions on how to ensure the first two bytes trigger the RX interrupt would be appreciated.

Our main target is to communicate with an external device through I2C for which we need to achieve transmit and receive data of 1 byte in interrupt mode without using loopback mode.

6 months ago

0 Aishwarya Rajesh 6 months ago

TI__Mastermind 18005 points

Hi Rodali,

Please allow me to take a look at this and get back to you by the end of the week.

Best Regards,

Aishwarya

0 Rodali Hazarika 6 months ago in reply to Aishwarya Rajesh

Prodigy 10 points

Thank you so much for your response Aishwarya. Is there some update regarding a possible solution to this issue?

0 Aishwarya Rajesh 6 months ago

TI__Mastermind 18005 points

Rodali,

Thanks for your patience. What is the purpose of I2cTx? It's set to 0 initially and continually set to 0. It looks to me you're sending an extra 0 somehow.

On line 159, rData[i] is being used but the variable 'i' is not being initialized anywhere before it.

Best Regards,

Aishwarya

0 Aishwarya Rajesh 5 months ago

TI__Mastermind 18005 points

Rodali,

Checking in to see if you have been able to resolve the issue and if you have any other questions.

Best Regards,

Aishwarya

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LAUNCHXL-F28P65X: Trigger interrupt for 1 byte without using Loopback Mode for I2C