How to wait for FDS_EVT_UPDATE success event ? I mean to say, I want to wait for updating the flash storage operation, before performing the flash read operation, how to do that exactly?

[RitD]

As in fds.h, i am using the fds_record_update() function to update a record, and then as soon it is completed, i want to read the updated data from the flash, but how do i wait for the fds_record_update() funtion to return success?

[Jared]

Hi,

The documentation says:

This function is asynchronous. Completion is reported through the FDS_EVT_UPDATE event that is sent to the registered event handler function.

Which means that you have to wait for the FDS_EVT_UPDATE event is generated in the callback handler. Easy way to implement is to wait in a loop until the an update flag is set. You'll then set the update flag in the callback handler after the FDS_EVT_UPDATE is generated.. Example:

int update_flag = 0;

static void fds_evt_handler(fds_evt_t const * p_evt)
{
        case FDS_EVT_UPDATE:
        {
            flag = 1;
    
        } break;
    
}

int main(void)
{

    rc = fds_init();
    APP_ERROR_CHECK(rc);

    /* Wait for fds to initialize. */
    wait_for_fds_ready();
    
    rc = fds_record_update(&desc, &m_dummy_record);
    APP_ERROR_CHECK(rc);
    
    while(!flag){}
    
    flag = 0;
    
    ....
    ...
    ...





}