Error in SPI pin allocation

[EliazLB]

Hello,

 

I just designed an electronic card using the STM32G474QET6TR. Just a day before receiving the card I realised I had made a mistake on the routing. I want to use SPI2 to driver 2 MAX4896ETP+ that are daisy chained.

As per the MAX datasheet, to do this you're supposed to connect as follows : 

But I realised while doing the pin allocation on the ioc file of my new STM32CubeIDE project that I actually messed up on my routing. I inverted the SPI2_SCK and the SPÏ2_MISO.

SO I'm left with:

- PB13 connected to the second MAX DOUT

- PB14 connected to the both MAXs SCLK

WHen it should be the otherway arround.

 

SO my question is acually quite simple, is it that big a problem ? Can I fix it through software or am I going to have to cut both tracks and then solder a wire to invert it ?

 

Thanks for your time and answers

 

 

[Pavel A.]

Hi,

This device does not seem to require frequent data exchanges with the MCU or high I/O flow, so possibly you can get away with bit-banging the SPI. So, it won't be a big deal. Things happen ))

 

[TDK]

You won't be able to use SPI2 as-is. For a single device, it would take less time to cut the track and solder a wire than to implement SPI by bit-banging, in my opinion. In any case, those are your options.