I have two nucleo boards communicating over SPI.  No Interrupts; No DMA ;   Using HAL TransmitReceive(..)   Chip Select set by software.  Simple  8 char ASCII Transfer.  Everything Works....almost.  I am using a logic analyzer to monitor the interact...

I know there are hundreds of posts about this and I've been through most of them but still can't get things to work.The concept is simple: set up 2 Nucleo F446 boards, one as full duplex slave the other as full duplex slave.Master pseudo code:while 1...