the balance between data size and FIFO threshold stm32H743II boards

[VKats.1]

Hi,

I am working with 2 boards (stm32H743II) - one defined as SPI Master with SPI4 block and the other as SPI Slave with SPI5 block.

I am trying to understand the balance between:

# Init.DataSize configuration and Init.FifoThreshold

can someone give me some examples that explain the balance between them?

this is the first time I am trying to develop an SPI slave block.

thank you

[TDK]

They are (mostly) independent settings.

Data size sets the number of bits per transaction (word size) and FIFO threshold adjusts the FTHLV field which adjust how much data is needed/required for the TXP/RXP flags get set.