TMS320F28335: Forcing values of Chip Select (CS) pin in SPI mode

Sujith Kallara

Prodigy 155 points

Part Number: TMS320F28335

Hi all,

In SPI communication mode, can we write zero value to the CS pin without writing data to the MOSI?.

Is there any specific control register for viewing the value of the CS pin?

over 2 years ago

0 Gus Martinez over 2 years ago

TI__Mastermind 27981 points

You cannot directly control the CS pin. I believe for what you are asking, you need to configure the MCU pin as GPIO. In GPIO pin you can control the state of the pin and read back the status of the pin.

0 Sujith Kallara over 2 years ago in reply to Gus Martinez

Prodigy 155 points

Thank you for the reply.

I was looking for generating a continuous clock pulse from the SPI cock lines. Thats why I asked for the CS pin controls. I need a low frequency peripheral clock without any jitters, preferably from the PLL source itself.

0 Gus Martinez over 2 years ago in reply to Sujith Kallara

TI__Mastermind 27981 points

I would suggest you look at the PWM in this case. You'll have more control.

+1 Sujith Kallara over 2 years ago in reply to Gus Martinez

Prodigy 155 points

Thank you Gus for your valuable suggestion. We tried with McBSP and generated a clock signal.

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TMS320F28335: Forcing values of Chip Select (CS) pin in SPI mode