Linux/66AK2L06: How to write to SPI bus from ARM Linux?

Gregory Johnson76

Intellectual 285 points

Part Number: 66AK2L06

Tool/software: Linux

Is it possible to configure a SPI bus (probably SPI2) as SPI master from the ARM Linux processor on the SoC?

We found examples down in the rtos SDK which would use the ARM processors with TI_RTOS and drive a SPI bus.

So far, we cannot find a corresponding example over in the linux SDK.

On the board, I see the following file: /usr/include/linux/spi/spidev.h

In the linux SDK, I see the following:

./targetNFS/usr/include/ti/csl/csl_qspi.h
./targetNFS/usr/include/ti/csl/csl_mcspi.h

Can someone point me in the right direction in the Texas Instruments documentation to find guidance on how to set up and use SPI buses on the Linux ARM processor inside the 66AK2L06?

Or, alternatively, is there a better way than a SPI bus for the 66AK2L06 to communicate with (for example) a TI Piccolo processor? Simple UART perhaps?

Thanks in advance,

Greg Johnson

over 8 years ago

0 Yordan Kovachev over 7 years ago

TI__Guru**** 161600 points

We're looking into this.

Best Regards,
Yordan

0 LeonardEllis over 7 years ago

TI__Guru 71526 points

5/10/18[LE]>unlock

0 db_woodall over 7 years ago

TI__Mastermind 21025 points

Hi Greg,

Have you looked at the PDK's SPI low level driver? The test code will have an example (probably not linux) of how to setup the SPI and how to read and write.

But yes, UART is a simpler interface to use. It depends on how much data you're transferring to/from the Piccolo and how much bandwidth the transfer takes.

-dave

0 Rex Chang over 7 years ago in reply to db_woodall

TI__Guru 50170 points

Hi, Gregory,

We don't have example in Linux, but you may want to refer to u-boot code in which NOR can be programmed from u-boot prompt.

Rex

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Linux/66AK2L06: How to write to SPI bus from ARM Linux?