esp-idf/components/hal/test/test_mpu.c

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#include <stdio.h>
#include <stdbool.h>
#include "unity.h"
#include "esp_attr.h"
#include "hal/mpu_hal.h"
volatile static int RTC_NOINIT_ATTR access = 0;
static void trigger_illegal_access(void)
{
access = 0;
intptr_t addr = 0x80000000; // MPU region 4
volatile int __attribute__((unused)) val = 0;
// Marked as an illegal access region at startup in ESP32, ESP32S2.
// Make accessible temporarily.
mpu_hal_set_region_access(4, MPU_REGION_RW);
val = *((int*) addr);
++access;
TEST_ASSERT_EQUAL(1, access);
printf("Sucessfully accessed location %p\r\n", (void*)addr);
// Make access to region illegal again.
mpu_hal_set_region_access(4, MPU_REGION_ILLEGAL);
++access;
// Since access to region is illegal, this should fail (causing a reset), and the increment
// to access count is not performed.
val = *((int*) addr);
++access;
}
void check_access(void)
{
TEST_ASSERT_EQUAL(2, access);
}
TEST_CASE_MULTIPLE_STAGES("Can set illegal access regions", "[soc][mpu]",
trigger_illegal_access,
check_access);