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afry-south / dragonfly-fcb

ÅF Dragonfly Quadrotor UAV Project
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Investigate use of the ARM-Cortex M4 MPU #100

Open stenbergd opened 8 years ago

stenbergd commented 8 years ago

Investigate possible use of the built-in Memory Protection Unit. What is it? How do we use it? When should we use it?

There is a FreeRTOS version that makes use of MPU.

It seems main use is to make sure different ISR:s and tasks can not access memory/variables they do not have permission to access. Could be a tool/feature to increase code execution safety.

adam-at-epsilon commented 8 years ago

Just basics:

There's an example in fcb-source/STM32Cube_FW_F3_V1.1.0/Projects/STM32F3-Discovery/Examples/Cortex/CORTEXM_MPU

It seems we can designate regions where read or write access is disallowed. Perhaps we can catch errors by defining MemManage_Handler.