SPRAD28 October 2022 AM2431 , AM2432 , AM2434 , AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1 , AM26C31 , AM26C31-EP , AM26C31M , AM26C32 , AM26C32-EP , AM26C32M , AM26LS31 , AM26LS31M , AM26LS32A , AM26LS32AC , AM26LS32AM , AM26LS33A , AM26LS33A-SP , AM26LS33AM , AM26LV31 , AM26LV31E , AM26LV31E-EP , AM26LV32 , AM26LV32E , AM26LV32E-EP , AM26S10 , AM2732 , AM2732-Q1
This can happen when MPU settings prevent the access of a region. For example, if a User mode application attempts to access a Privileged mode access only region a permission fault occurs.
Example:
__attribute__((section("mySection"))) Bool test;
void empty_main(void *args)
{
Drivers_open();
Board_driversOpen();
test = 1;
Board_driversClose();
Drivers_close();
}
A read-only memory section was created by configuring the MPU access permission attributes. Then, a Boolean variable test is placed in this read-only section (line 48). When trying to write to this variable (line 56), an MPU permission fault was triggered.