CCS/TMS320F28075: How to use I2C without FIFO function

Johnny Shih

Part Number: TMS320F28075
Other Parts Discussed in Thread: CONTROLSUITE, C2000WARE

Tool/software: Code Composer Studio

Dear TI team,

I want to use I2C read and write external EEPROM, but I want without FIFO,

because I need over write 20 bytes data and read 20 bytes data (one time), but TI sample code (controlSUITE) is use FIFO & it limit 16 bit (one time),

Please help check how to initial the FW or provide sample code.

(ex: Wait 20 byte data and Read 20 byte without FIFO function.)

My sample code location in control:

C:\ti\controlSUITE\device_support\F2807x\v210\F2807x_examples_Cpu1\i2c_eeprom\cpu01

over 6 years ago

0 Mark Labbato over 6 years ago

Guru 30330 points

Johnny,

Ensure that the FIFO enhancements are not enabled. Se I2CFFTX/RX registers to 0.
Instead of relying on the interrupts, you can also disable these. After transmitting data you want to wait for ARDY to be cleared. and you can verify the XRDYINT/RRDYINT flags are set or not as well. Basically, you will need to send each byte and wait for it to complete before sending or reading the next one.

I hope this makes sense and gets you started!

-Mark

0 Johnny Shih over 6 years ago in reply to Mark Labbato

Intellectual 535 points

Dear Mark,

The function can work now.

Thanks a lot.

0 Johnny Shih over 5 years ago in reply to Mark Labbato

Intellectual 535 points

Dear Mark,

Another issue check with you,

It's can work I2C function when use I2C polling,

But can it use interrupt (but without FIFO) for I2C in C2000?

0 Mark Labbato over 5 years ago in reply to Johnny Shih

Guru 30330 points

Please correct me if I misinterpreted your question. Are you asking if it is possible to use the I2C interrupts without the FIFO? Yes. It is possible, but remember that you can only write one word at a time to the DXR register.

-Mark

0 Johnny Shih over 5 years ago in reply to Mark Labbato

Intellectual 535 points

Dear Mark,

Yes, this is the answer I want to know.

I will try to modify source code first,

and could you have same sample code for this (not controlSUITE sample code)?

0 Mark Labbato over 5 years ago in reply to Johnny Shih

Guru 30330 points

Johnny,

controlSUITE and C2000Ware are our source for examples. The intention of the provided examples is to get you started working with the module, we don't generally provide sample code for every possible configuration and use case of a module.

Thanks,
Mark

0 Johnny Shih over 5 years ago in reply to Mark Labbato

Intellectual 535 points

Dear Mark,

OK, It's can work now, thanks a lot.

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CCS/TMS320F28075: How to use I2C without FIFO function