wiced_framework_app_get_size returns weird values

[Anonymous]

Hello,

I'm working on an application based on a custom board that includes external flash memory. Currently, I can manage to read/write from/into this memory, and now I would like to use it for OTA purpose. So, I started to research in the Application Management Functions provided by the framework.

I started with a simple operation which consists of opening several apps and reading their size. Here is the sample code for one application:

   /*
    * DCT_APP0_INDEX
    */
   if( wiced_framework_app_open( DCT_APP0_INDEX, &app ) != WICED_SUCCESS ) {
      return WICED_ERROR;
   }
   if( wiced_framework_app_get_size( &app, &current_size ) != WICED_SUCCESS ) {
      return WICED_ERROR;
   }
   if( wiced_framework_app_close( &app ) != WICED_SUCCESS ) {
      return WICED_ERROR;
   }
   WPRINT_APP_DEBUG( ("[D - OTA] Current app size (at DCT_APP0_INDEX)\t\t: %lu bytes\n", (unsigned long)(current_size)) );

The code is the same for every applications. And here is the output:

[D - OTA] Current app size (at DCT_FR_APP_INDEX)              : 99913728 bytes
[D - OTA] Current app size (at DCT_DCT_IMAGE_INDEX)           : 1965531136 bytes
[D - OTA] Current app size (at DCT_OTA_APP_INDEX)             : 1848942592 bytes
[D - OTA] Current app size (at DCT_FILESYSTEM_IMAGE_INDEX)    : 852418560 bytes
[D - OTA] Current app size (at DCT_WIFI_FIRMWARE_INDEX)       : 2306969600 bytes
[D - OTA] Current app size (at DCT_APP0_INDEX)                : 2316611584 bytes
[D - OTA] Current app size (at DCT_APP1_INDEX)                : 2360836096 bytes
[D - OTA] Current app size (at DCT_APP2_INDEX)                : 2349637632 bytes

As specified in the documentation, wiced_framework_app_get_size is supposed to return the size of an application in bytes format.

/** Returns the current size of the application.
 *
 * Returns the current size of the application.
 *
 * @warning The size of the application is always aligned to sector boundaries. Application
 *          size may be different from actual size on a PC.
 *
 * @param[inout] app : Application handler.
 * @param[out] size  : The size allocated to the application in bytes.
 *
 *  @return Wiced reuslt code
 */

As you can see in the output, the function returns very strange values. I wonder if it is a normal behaviour (not yet stable part of SDK), or if it comes from my code.

SDK version : WICED 3.3.1

Microcontroller : STM32F415

External memory chip : AMIC A25L

Thanks in advance for your support !

[JoYi_1844281 · Accepted solution]

Did you burn the APPS.BIN into the external flash via download_apps ?

otherwise you may get the size incorrect!

[Anonymous]

Hello jone​

Sorry for the late answer, I'm quite busy with other aspects of my project.

I made another try following your instructions. When I first write some content into external memory, specifying applications and DCT at flash time, it works well !

Thanks for your help.