How to free the RAM(heap) of gotten by the FreeRTOS_CLIRegisterCommand()?

Kei.Kashi · March 15, 2024, 7:14am

Hi everyone,

I use the FreeRTOS_CLIRegisterCommand() function to implement CLI interface of my product.

However, I cannot understand how to release heap area gotten by FreeRTOS_CLIRegisterCommand() function.

There is below pvPortMalloc() operation in FreeRTOS_CLIRegisterCommand() function.
And I need to call the function multiple times to register the CLI command.
Then the function got the each command of heap area.

github.com

FreeRTOS/FreeRTOS/blob/000c005ceed37605a3c146459acdf605ec90919e/FreeRTOS-Plus/Source/FreeRTOS-Plus-CLI/FreeRTOS_CLI.c#L121


      
          
          BaseType_t FreeRTOS_CLIRegisterCommand( const CLI_Command_Definition_t * const pxCommandToRegister )
          {
              BaseType_t xReturn = pdFAIL;
              CLI_Definition_List_Item_t * pxNewListItem;
          
              /* Check the parameter is not NULL. */
              configASSERT( pxCommandToRegister != NULL );
          
              /* Create a new list item that will reference the command being registered. */
              pxNewListItem = ( CLI_Definition_List_Item_t * ) pvPortMalloc( sizeof( CLI_Definition_List_Item_t ) );
              configASSERT( pxNewListItem != NULL );
          
              if( pxNewListItem != NULL )
              {
                  prvRegisterCommand( pxCommandToRegister, pxNewListItem );
                  xReturn = pdPASS;
              }
          
              return xReturn;
          }

However, I could not find the way to release these heap area after the system finished using CLI.

How do I solve this issue?

aggarg · March 15, 2024, 8:55am

Can you use FreeRTOS_CLIRegisterCommandStatic instead so that you can manage the memory in application?

Kei.Kashi · March 18, 2024, 12:07am

Hi Aggarg,

Thank you for your reply. It’s good solution!
However, the CLI lib that I am using version FreeRTOS+CLI V1.0.4 doesn’t have that function.
But I could understand your proposal. It will be solved by your idea.

aggarg · March 18, 2024, 5:04am

This is the function I meant - FreeRTOS/FreeRTOS-Plus/Source/FreeRTOS-Plus-CLI/FreeRTOS_CLI.c at 000c005ceed37605a3c146459acdf605ec90919e · FreeRTOS/FreeRTOS · GitHub.