Speed of Inter Cpu Communication

[emre108]

Hello guys and Mr. Majerle,

Sorry to disturb you but I really need some help.
I am having a hard time sharing data between two cores(M7, M4). Actually, I succeed data-sharing part however it is quite slow. I mean it takes 50us to share 120 bytes of data. I don't understand how writing and reading data from RAM can take much more time than regular SPI protocol communication. It supposes to take much less time than 50us in my understanding of embedded systems. I need to have really fast data sharing. I am using the same algorithm that Majerle using. Clock speeds are at maximum(480Mhz(M7)-240Mhz(M4)). I am sending an uint32_t type array that consists of 30 elements. Reading and writing parts done in whiles loops that I created. Do you have any suggestions?

Thank you so much. Have a good day.