STM32L471RGT6 32 bit SPI

[rwils.1]

Hi is it possible to communicate 32 bit data over the SPI bus? Using IOC to set up the SPI port 2 , I seem to be limited to 16 bits.

Thanks a lot 

 

Richard

 

 

[Tesla DeLorean]

As a pair of 16-bit words, or as 4-bytes, in a consecutive fashion, and arranged to suit whatever MSB-LSB and endian form you need.

[Pavel A.]

Of course. Send 16-bits, twice. Newer STM32s can send 32 bits in one write to the SPI data register, but L4 is limited to 16 bits at once.

 

[rwils.1]

Thank you Pavel, I was going to use NSS but I was thinking that that won't work as comms will shutdown after the first 16 bytes. I guess I will just have to manually control NSS. 
Cheers

Richard

 

 

[Tesla DeLorean]

You pretty much always have to manually control NSS, as it's gated by the SPI Enable, not by individual words or byte transacted via the data register. Most just use a GPIO as it's less trouble.

[rwils.1]

Thanks for the information!