TMS320F28069M: Multidevice SPI-B

Robin Maubert

Hi TI team,

I would use 2 SPI devices on SPI-B but only a single chip select is available. I do not find a way to set another chip select pin than the default one.

How can I do it ?

Thanks,

over 7 years ago

0 Veena Kamath over 7 years ago

TI__Mastermind 32695 points

Hi,

You can use other GPIO pins and drive them using software instead of using the dedicated CS pins

Regards,

Veena

0 Robin Maubert over 7 years ago in reply to Veena Kamath

Intellectual 845 points

Hi,

Ok thanks for the help. So I just have to set high or low the desired GPIO ? No other action needed (how the SPI module knows that I won't use the usual CS pin wired to another device) ?

regards

0 Veena Kamath over 7 years ago in reply to Robin Maubert

TI__Mastermind 32695 points

Hi,

You can use 2 GPIO pins on the master and connect these to the CS pins of the slaves. You can just these GPIO pins high and low based on which slave the data to be sent to.

You need not configure the STE pin on the the master

Regards,

Veena

0 Robin Maubert over 7 years ago in reply to Veena Kamath

Intellectual 845 points

Hi,

Ok so you mean using GPIO_setHigh // GPIO_setLow for the 2 CS and not using the CS pin ? You confirmthat I have to set the GPIO_27 as a GPIO_27_Mode_GeneralPurpose and not as the GPIO_27_Mode_SPISTEB_NOT to be able to use an other CS pin ?

Thanks

0 Veena Kamath over 7 years ago in reply to Robin Maubert

TI__Mastermind 32695 points

Yes, That is right.

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TMS320F28069M: Multidevice SPI-B