pstorage: stuck in erase operation

RE: pstorage: stuck in erase operation

Petter Myhre — Thu, 04 Sep 2014 18:02:40 GMT

Thank for for answering your own question, and separating the questions.

RE: pstorage: stuck in erase operation

scytulip — Thu, 28 Aug 2014 19:53:11 GMT

Hi all,

I repost my question here. I found the problem chain is

pstorage_init() called sd_flash_page_erase(), and set m_cmd_queue.flash_access = true;
sd_flash_page_erase() will not trigger system event handler which calls pstorage_sys_event_handler, and thus m_cmd_queue.flash_access kept true;
because m_cmd_queue.flash_access is true, then later the pstorage_clear() is not executed immediately but enqueued.
Enqueued command will not be executed, and thus m_cmd_queue.count is always 1.

.........

RE: pstorage: stuck in erase operation

Nikita — Thu, 28 Aug 2014 18:05:24 GMT

Ok, the problem was that when you use scheduler all pstorage execution will be transfered from interrupts to the main context so you need to call scheduler events execution:

// Wait until FLASH all cleared
uint32_t count;
do {
    app_sched_execute();
    err_code = pstorage_access_status_get(&count);
    APP_ERROR_CHECK(err_code);
} while(count);

UPD:

I messed up and forgot to add app_sched_execute();

RE: pstorage: stuck in erase operation

Nikita — Wed, 27 Aug 2014 01:01:55 GMT

No, you must use softdevice_sys_evt_handler_set(), because it's where softdevice will handle end of flash operations ans start new operations:

Registering for system events and passing them on to pstorage module using the pstorage_sys_event_handler is mandatory for the module to function as expected. Code snippet below demonstrates what application needs to do for this.
/**@brief Function for dispatching a system event to interested modules.
  
   @details This function is called from the System event interrupt handler after a system
            event has been received.
  
   @param[in]   sys_evt   System stack event.
 */
static void sys_evt_dispatch(uint32_t sys_evt)
{
    pstorage_sys_event_handler(sys_evt);
}
/**@brief BLE stack initialization.
  
   @details Initializes the SoftDevice and the stack event interrupt.
 */
static void ble_ant_stack_init(void)
{
    // Initialize SoftDevice
    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);
    
    // Subscribe for BLE events.
    uint32_t err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
    
    // Register with the SoftDevice handler module for System events.
    err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}

You will block CPU until Flash erase is done with your code:

// Wait until FLASH all cleared
uint32_t count;
do {
    err_code = pstorage_access_status_get(&count);
    APP_ERROR_CHECK(err_code);
} while(count); /* Stuck here??? */

RE: pstorage: stuck in erase operation

scytulip — Tue, 26 Aug 2014 19:10:57 GMT

Hi, Nikita. I tried softdevice_sys_evt_handler_set() but found this is not what I want. Yes, I can do asynchronous operation in this event handler. However, I'd like to block CPU until the Flash erase is done.

RE: pstorage: stuck in erase operation

Nikita — Mon, 25 Aug 2014 18:48:56 GMT

Did you init sys events handler with softdevice_sys_evt_handler_set()?

RE: pstorage: stuck in erase operation

scytulip — Mon, 25 Aug 2014 18:12:30 GMT

#define __DATA_TYPE uint8_t \ #define DATA_BLOCK_SIZE 128 * sizeof(__DATA_TYPE)
#define DATA_BLOCK_COUNT 256\ and pstorage_callback is empty.

RE: pstorage: stuck in erase operation

Nikita — Mon, 25 Aug 2014 17:12:28 GMT

Show DATA_BLOCK_SIZE and DATA_BLOCK_COUNT defines and pstorage_callback. Try to check your code with disabled scheduler.

RE: pstorage: stuck in erase operation

scytulip — Mon, 25 Aug 2014 16:58:13 GMT

I know pstorage is enqueued operation, so I tried "do { err_code = pstorage_access_status_get(&count); APP_ERROR_CHECK(err_code); app_sched_execute(); } while(count);" No change on the stuck situation. :(