EEPROM Emulated Timing (x-cube-eeprom)
I am running a bluetooth application using freeRTOS on a Nucleo-WB55 (STM32WB55RG). I am in the process of implementing Emulated EEPROM (X-Cube-EEPROM) to store som data.
After implementing eeprom emulated in a ble_heartrate_freertos example I have had problems understanding the execution of the Emulated EEPROM operation after a pagetransfer + cleanup (obs. for simplicity I use EE_CleanUp here)
Without BLE activated (in SingleCore mode) EEPROM Emulated write and pagetransfer+cleanup looks just fine:
Pagetransfer + cleanup takes ~40-50ms
With BLE activated (in DualCore Mode) the following EEPROM operation occupies much more time than expected:
Pagetransfer + cleanup still takes ~40-50ms, but a long delay is introduced in the next EEPROM operation:
Here is an example of the additional delay introduced in the following EEPROM (after a pagetransfer + cleanup) operation: 
Here is the code:
int main(void)
{
...
osKernelInitialize();
defaultTaskHandle = osThreadNew(StartDefaultTask, NULL, &defaultTask_attributes);
APPE_Init();
EEPROM_Emul_Init();
EEPROMTimer_Id = osTimerNew(EEPROM_Emul_Simple, osTimerPeriodic, (void *)0, NULL);
osTimerStart(EEPROMTimer_Id, 50);
/* Start scheduler */
osKernelStart();
/* We should never get here as control is now taken by the scheduler */
while (1) { }
}
static void EEPROM_Emul_Simple()
{
HAL_GPIO_TogglePin(DEBUG1_Gpio_Port, DEBUG1_Pin);
static uint32_t VarValue = 1;
static uint32_t Index = 1;
static EE_Status ee_status = EE_OK;
taskENTER_CRITICAL(); // Exit of critical section in FreeRTOS (disables interrupts)
/* Wait for the flash semaphore to be free */
if (HAL_HSEM_IsSemTaken(CFG_HW_FLASH_SEMID)) {
taskEXIT_CRITICAL(); // exit of critical section in FreeRTOS
HAL_GPIO_TogglePin(DEBUG3_Gpio_Port, DEBUG3_Pin);
return;
}
if (HAL_HSEM_Take(CFG_HW_FLASH_SEMID, HSEM_PROCESS_1) != HAL_OK) {
taskEXIT_CRITICAL(); // exit of critical section in FreeRTOS
HAL_GPIO_TogglePin(DEBUG3_Gpio_Port, DEBUG3_Pin);
return;
}
HAL_FLASH_Unlock(); /* Unlock the Flash Program Erase controller */
/* ----------- WRITE ----------- */
/* Toggle LED to show the EEPROM operations are effectively running */
BSP_LED_Toggle(LED_BLUE);
ee_status = EE_WriteVariable32bits(Index, Index*VarValue);
/* If flash is used by CPU2 */
if (ee_status == EE_FLASH_USED) {
/* Lock the Flash Program Erase controller and release the semaphore */
HAL_FLASH_Lock();
HAL_HSEM_Release(CFG_HW_FLASH_SEMID, HSEM_PROCESS_1);
taskEXIT_CRITICAL(); // exit of critical section in FreeRTOS
HAL_GPIO_TogglePin(DEBUG3_Gpio_Port, DEBUG3_Pin);
return;
}
/* Start cleanup mode, if cleanup is needed */
if ((ee_status & EE_STATUSMASK_CLEANUP) == EE_STATUSMASK_CLEANUP) {ErasingOnGoing = 0; ee_status |= EE_CleanUp();}
if ((ee_status & EE_STATUSMASK_ERROR) == EE_STATUSMASK_ERROR) {Error_Handler();}
/* Prepare the static parameters for the next time next the function is called by the FreeRTOS */
Index++;
if (Index >= (NB_OF_VARIABLES + 1)) {
VarValue++;
Index = 1;
}
/* Lock the Flash Program Erase controller and release flash semaphore if needed */
HAL_FLASH_Lock();
HAL_HSEM_Release(CFG_HW_FLASH_SEMID, HSEM_PROCESS_1);
taskEXIT_CRITICAL(); // exit of critical section in FreeRTOS
HAL_GPIO_TogglePin(DEBUG1_Gpio_Port, DEBUG1_Pin);
return;
}