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?

Question

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 · Accepted Answer

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;
 
 ....
 ...
 ...





}

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?

Top Replies