TMS320F28335: How to use the SPIRXBUF and FIFO in software

c c

Part Number: TMS320F28335

Hi,

I'm a little confused on the relationship among the RXFIFO, SPIRXBUF and SPIDAT when I read the 28335 design spec. My understanding is when the device is as slave and if the data from master, firstly it would get to the SPIDAT with one word(16bit) and then transfer to SPIRXBUF, but there is no RXFIFO definition in doc, only a SPIFFRX for the FIFO, is that mean user need to define the FIFO by themselves? and how could I to read the data from SPIRXBUF in software, is there any code example supplied for me ? thanks!

Best regards,

over 2 years ago

0 Pranali Gaydhane over 2 years ago

TI__Prodigy 470 points

Hi,

The expert is out of the office because of Holiday. Please expect a reply by Tuesday.

Thanks.

+1 Gus Martinez over 2 years ago in reply to Pranali Gaydhane

TI__Mastermind 29311 points

CC,

The diagram below illustrates the relationship between SPIDAT and SPIRXBUF. When FIFO is enabled, the data from SPIDAT gets pushed on to the SPIRX FIFO. You read data off the FIFO by reading a single register: SPIRXBUF. SPIFFRX is used to program or read the status of the FIFO.

0 c c over 2 years ago in reply to Gus Martinez

Prodigy 50 points

Hi,

I got it, so when read the register SPIRXBUF one time, the FIFO pointer would auto increase once, we just need to read SPIRXBUF 16 times to get all FIFO data.

Thanks!

Best regards,

0 Gus Martinez over 2 years ago in reply to c c

TI__Mastermind 29311 points

You got it!

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TMS320F28335: How to use the SPIRXBUF and FIFO in software