Tool/software:
SPI (serial peraphral interface) has two bits W1 and W0, which define number of bytes in each transfer (see below).
R/W W1 W0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0.
For example, W1 W0 = "00" or "01" means one byte or two bytes transfer.
Does AM335x McSPI support this? Thank you.