Solved
STM32H750 Cache ECC
Hi,
I am trying to trigger a cache ECC error. I referenced AN5342 and this post but Ive had no luck. Please find my code snippet below:
I disable the ECC, invalidate and enable the cache and re-enable the ECC.
I check the IEBR and DEBR registers along with other fault status registers.
Any advice is appreciated. Thanks!
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_RTC_Init();
/* USER CODE BEGIN 2 */
/*caches must be invalidated before being enabled,
*and the Cortex-M7 reference manual documents the IEBR/DEBR registers to detect when such errors occur.
*/
// Cache is disabled by default
// Disable ECC
SCB->CACR = 0x02; //0x01 & SCB_CACR_ECCEN_Msk;
// Invalidate cache and enable
SCB_EnableICache();
SCB_EnableDCache();
/* Write to Memory */
volatile uint32_t *mem_addr = (uint32_t *)0x30000000; // Example address
*mem_addr = 0xDEADBEEF; // Write to memory
int x = *mem_addr; x++;
// Enable ECC
SCB->CACR = 0x00;
// Check IEBR / DEBR registers for ECC error
while(1){
// Check IEBR register for Instruction error
if(*(uint32_t*)0xE000EFB0){
HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_2, GPIO_PIN_RESET);
}
if(*(uint32_t*)0xE000EFB4){
HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_2, GPIO_PIN_RESET);
}
// Check DEBR register for Databank error
if(*(uint32_t*)0xE000EFB8){
HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_2, GPIO_PIN_RESET);
}
if(*(uint32_t*)0xE000EFBC){
HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_2, GPIO_PIN_RESET);
}
// Memory Management Fault Status Register
if (SCB->CFSR & SCB_CFSR_MEMFAULTSR_Msk) {
HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_2, GPIO_PIN_RESET);
}
// Check Bus Fault Status Register
if (SCB->CFSR & SCB_CFSR_BUSFAULTSR_Msk) {
HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_2, GPIO_PIN_RESET);
}
// Check Usage Fault Status Register
if (SCB->CFSR & SCB_CFSR_USGFAULTSR_Msk) {
HAL_GPIO_WritePin(GPIOJ, GPIO_PIN_2, GPIO_PIN_RESET);
}
}
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}