CC1312R: SPI between raspberry-pi and the CC

Michael Brutman

Part Number: CC1312R

is it possible for a CC to be a slave in regards to a raspberry-pi , while maintaining an external flash (with also SPI driver via NVS driver), and also the CC is a master SPI in regards to a FPGA component?

meaning, all the three needs to co-exist:

CC (master)-->FPGA (slave)

RASBERI PI (master)) ---> CC (slave)

CC (master) ---> NVS extFlash(slave)

over 2 years ago

+1 Marie H over 2 years ago

TI__Guru* 82431 points

Hi Michael,

The CC1312R device has two SPI modules.

You should be able to configure one as a master and one as a slave. The master module would then use a SS (slave select) to differentiate between the FPGA board and external flash.

Cheers,

Marie H

0 Michael Brutman over 2 years ago in reply to Marie H

Intellectual 321 points

Hi, when trying to configure two SPI instances of the cc with LaunchPad SPI Bus with Chip Select hardware I'm getting a resource conflict:

0 TheGhostOf over 2 years ago in reply to Michael Brutman

Mastermind 6470 points

Have you tried to assign actual DIOs? You need to set the specific pin you are going to use.

0 Michael Brutman over 2 years ago in reply to TheGhostOf

Intellectual 321 points

it lets me use DIO that are not those from the h/w. but will it work?

+1 TheGhostOf over 2 years ago in reply to Michael Brutman

Mastermind 6470 points

You can use any DIO for the second SPI bus as long as the DIO is not used for something else.

0 Michael Brutman over 2 years ago in reply to TheGhostOf

Intellectual 321 points

thanks, do I have to close my CC SPI master handle when there is an invoked spi transaction as slave?

+1 Marie H over 2 years ago in reply to Michael Brutman

TI__Guru* 82431 points

No, as long as you are using different instances (handles) there is no need to use the open/close api between.

Cheers,

Marie H

0 Michael Brutman over 2 years ago in reply to TheGhostOf

Intellectual 321 points

What is the difference between using the h/w suggested DIO for the SPI lines in compare to using just a random DIO?

+1 TheGhostOf over 2 years ago in reply to Michael Brutman

Mastermind 6470 points

The examples are written to be used on a Launchpad. The Launchpad has UART, I2C etc on fixed DIOs since the interface are connected to other resources on the board. Hence the example use HW suggested DIOs. Since SPI is not dependent on something on the Launchpad, you can route the the signals to what ever DIO you want as long as thy are not used by a different driver.

For a custom board you can define all the interface freely, see "custom board" in the documentation.

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CC1312R: SPI between raspberry-pi and the CC