#MPU driver & Fault handler for Cortex-M4
##Requirements
- ChibiOS
- Cortex-M4 with Memory Protection Unit
##MPU Usage
By default the MPU prevents access to NULL pointer via memory region 7 (highest priority).
Code execution from RAM is also disabled using lowest priority (memory region).
To enable this you only have call mpu_init() to be protected.
You can then further restrict memory by using mpu_configure_region, e.g.:
/* Disable code execution from RAM. */
mpu_configure_region(6, /* Region number. */
0x2000 0000, /* Base address */
20, /* 1MB (2^20) */
AP_RW_RW,
false); /* Non executable. */If you want to enable code execution from RAM you should add an executable region with higher priority (1-6).
##Fault Handler Usage
- Implement
void fault_printf(const char *fmt, ...)for logging. - Call
fault_init()to enable the fault IRQs.
The file fault_tests.c contains functions to test the MPU and the fault handler.
Note: Depending on the CPU (Cortex-M3/M4 or Cortex-M0) you need to compile fault_v7m.s or fault_v6m.s
##License This code is released under a BSD license