MDMA seems to do not support CRYP1 pointer address fix, with STM32MP157C-DK2

[CLim.2]

Hello experts,

I am in purpose of developing driver of the peripheral CRYP1 with MDMA on STM32MP157C-DK2 board.

I refer to STM32MP157 advanced Arm®-based 32-bit MPUs - Reference manual(RM0436),

firstly in page 1160, CRYP1 is AHB5 source, and two stream are supported to MDMA,

and at page 2025, CRYP_DIN address must be fixed. 

However according to description of MDMA address update configure register(MDMA_CxTCR) at page 1181,

configuring DINC and SINC , address pointer fix is forbidden when AHB bus setted.

In addition, setting DBUS and SBUS in MDMA_CxTBR, cannot be writen even eEN bit is 0.

I wonder how CRYP1 can be implemented with MDMA.

[CLim.2 · Accepted solution]

I fix this issue by setting CRYP as AXI.