How to correctly access flash memory to erase sectors (operation triggered by a BLE notification) before notifying the operation status through BLE.
Dear,
My goal is to erase some flash sectors after the receipt of a specific BLE notification ( ChardId = OTAS_STM_BASE_ADDR_ID / Command = OTAS_STM_APPLICATION_UPLOAD) (line 17 in the first code sample). Once the operation done, I should notify the initiator via BLE using the method OTAS_STM_UpdateChar().
The issue is that the notification is correctly read by the initiator if I do not perform the erase operation, and is NOT read by the initiator if I perform the erase operation. Therefore, I suspect this flash erase operation to disturb the BLE protocol.
Here the code dealing with the received notification from the initiator :
switch(p_notification->ChardId)
{
case OTAS_STM_BASE_ADDR_ID:
{
switch( ((OTA_STM_Base_Addr_Event_Format_t*)(p_notification->pPayload))->Command )
{
case OTAS_STM_STOP_ALL_UPLOAD:
break;
case OTAS_STM_WIRELESS_FW_UPLOAD:
OTAS_APP_Context.file_type = Wireless_Fw;
OTAS_APP_Context.base_address = FLASH_BASE;
memcpy( (uint8_t*)&OTAS_APP_Context.base_address, ((OTA_STM_Base_Addr_Event_Format_t*)(p_notification->pPayload))->Base_Addr, p_notification->ValueLength -1 );
OTAS_APP_Context.write_value_index = 0;
break;
case OTAS_STM_APPLICATION_UPLOAD:
(void)vBOOT_eraseAppSectors();
OTAS_APP_Context.file_type = Fw_App;
OTAS_APP_Context.base_address = MEMORY_MAP_APP_ADDR;
OTAS_APP_Context.write_value_index = 0;
OTAS_STM_UpdateChar(OTAS_STM_CONF_ID, fw_start_upload_ind);
IHM_setStateFlag(IHM_STATE_BLE_UPLOADING_NEW_FIRMWARE, true);
break;
case OTAS_STM_UPLOAD_FINISHED:
OTAS_STM_UpdateChar(OTAS_STM_CONF_ID, fw_received_ok_ind);
break;
case OTAS_STM_CANCEL_UPLOAD:
break;
default:
break;
}
}
break;Here the code of the method used to erase flash sectors :
int vBOOT_eraseAppSectors()
{
int rc;
uint32_t primask_bit;
uint32_t cpu1_sem_status;
uint32_t cpu2_sem_status = 0;
rc = SHCI_C2_FLASH_EraseActivity(ERASE_ACTIVITY_ON);
if (rc != SHCI_Success)
return rc;
for(uint8_t i = 0; i < (MEMORY_MAP_APP_SIZE & 0xFF000) >> 12; i++)
{
while( LL_HSEM_1StepLock( HSEM, CFG_HW_FLASH_SEMID ) );
rc = HAL_FLASH_Unlock();
if (rc != HAL_OK)
return rc;
/* Wait for the BSY bit */
while (__HAL_FLASH_GET_FLAG(FLASH_FLAG_BSY) != 0U)
{
}
do
{
while(LL_FLASH_IsActiveFlag_OperationSuspended());
/* Enter critical section */
primask_bit = __get_PRIMASK();
__disable_irq();
cpu1_sem_status = LL_HSEM_GetStatus( HSEM, CFG_HW_BLOCK_FLASH_REQ_BY_CPU1_SEMID );
if(cpu1_sem_status == 0)
{
cpu2_sem_status = LL_HSEM_1StepLock( HSEM, CFG_HW_BLOCK_FLASH_REQ_BY_CPU2_SEMID );
if(cpu2_sem_status == 0)
{
FLASH_PageErase(((MEMORY_MAP_APP_ADDR + (0x1000 * i)) & 0xFF000) >> 12);
LL_HSEM_ReleaseLock( HSEM, CFG_HW_BLOCK_FLASH_REQ_BY_CPU2_SEMID, 0 );
}
}
/* Exit critical section */
__set_PRIMASK(primask_bit);
}while(cpu2_sem_status || cpu1_sem_status);
/* Wait for the BSY bit */
while (__HAL_FLASH_GET_FLAG(FLASH_FLAG_BSY) != 0U)
{
}
rc = HAL_FLASH_Lock();
if (rc != HAL_OK)
return rc;
LL_HSEM_ReleaseLock( HSEM, CFG_HW_FLASH_SEMID, 0 );
}
rc = SHCI_C2_FLASH_EraseActivity(ERASE_ACTIVITY_OFF);
if (rc != SHCI_Success)
return rc;
//hci_resume_flow(); ??
return rc;
}Any big mistakes ? Thank you very much for your help !!
Best regards,
Robin