CC3220SF-LAUNCHXL: LAUNCHXL-CC3220: SPI CS pin reconfiguration

CHEN YU WU

Prodigy 130 points

Part Number: CC3220SF-LAUNCHXL
Other Parts Discussed in Thread: SYSCONFIG

Hello team :

I want to use sample code (SPI master) to connect multiple slave.

How do i reconfigure chip select pin for different slave?

over 3 years ago

0 Jan D over 3 years ago

Guru 73255 points

Hi,

You should use 3-wire SPI mode and for CS use pins configured as GPIOs.

Jan

0 CHEN YU WU over 3 years ago in reply to Jan D

Prodigy 130 points

Hi JAN,

thanks for your reply.

I already setting 3-wire mode.But I don't know how to asign specific pin (ex:pin 04) to be CS

SMITH

0 Jan D over 3 years ago in reply to CHEN YU WU

Guru 73255 points

Hi,

Just setup pin as GPIO in Sysconfig or pinmux. And before your SPI transaction you should set this GPIO pin to low using GPIO TI driver APIs. After SPI operation set this pin manually to high and move to next CS pin...

Jan

0 CHEN YU WU over 3 years ago in reply to Jan D

Prodigy 130 points

Hi JAN,

I already setting GPIO in Sysconfig, and control GPIO's low and high.But I doesn't get any response from SPI slave.

Any other setting I need to do ?

And I also try 4-wired SPI mode, It's work.

Smith

+1 Jan D over 3 years ago in reply to CHEN YU WU

Guru 73255 points

Hi,

I am not sure what may to be wrong. Please check your SPI pins and CS via logic analyser. Do you see expected SPI communication at MISO, MOSI, CLK and CS controlled by GPIO?

Jan

0 CHEN YU WU over 3 years ago in reply to Jan D

Prodigy 130 points

Hi,JAN

I found that I misuse GPIO Wrtie function, after correct it I can communicate with multiple SPI slave via 3-wire SPI mode.

thanks a lot .

Smith.

0 Jan D over 3 years ago in reply to CHEN YU WU

Guru 73255 points

Hi Smith,

Thank you for a update. It is good to hear that you was able to resolve your issue.

Jan

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CC3220SF-LAUNCHXL: LAUNCHXL-CC3220: SPI CS pin reconfiguration