What does the HAL_SAI_Receive() function take in as the parameter- 'Size'?

[Jansunil]

I am trying to use the HAL_SAI_Receive() function from the STMF767xx SAI drivers to receive some data from a device and I would like to know what does the 'Size' parameter actually represent.

My scenario is as follows:

1.) The SAI operates in slave mode

2.) data size in a slot is 8 bits

3.) FS active length (on time of the FS pulse) is 32 bits

4.) Each 4 slots per FS pulse

In the above scenario, would the 'Size' parameter be ? would it be equal to :

(a.)The data size per slot? or would it be (or)

(b.)number of slots*data size per slot? (or)

(c.) something else?

[TDK · Accepted solution]

It is the number of data words to receive in units of the datasize you have defined.

In this case, if you want to receive 32 bits and your data size is 8 bits, it should be 4.

[Jansunil]

This is clear. Thank you @TDK​