CC3220: Host driven factory reset procedure

Hi Arnout,

The code that you have there is basically all that is needed to execute a factory reset. After issuing the command, the NWP will indeed take several seconds to complete the factory reset operation. During this time, the NWP is not available for use and sl_FsCtl() will block until programming is complete. Once it returns, do a sl_stop()/sl_start() and then reset the MCU. Resetting the MCU through software should be good enough - you don't need to actually physically assert the reset signal.If you happen to reset or power-cycle the device while sl_FsCtl() is still running, the NWP will continue the factory reset automatically and will block program execution until it is complete, which is most likely what you observed.

The code below here works for host-driven factory reset as well as hardware-driven factory reset:

void mainThread(void *pvParameters)
{
    int32_t             status = 0;
    pthread_attr_t      pAttrs_spawn;
    pthread_attr_t      pAttrs;
    struct sched_param  priParam;
    int32_t             mode;
    int16_t             ret;

    SPI_init();
    Display_init();
    display = Display_open(Display_Type_UART, NULL);
    if (display == NULL) {
        /* Failed to open display driver */
        while(1);
    }
    ret = sem_init(&ipEventSyncObj,0,0);
    if(ret != 0)
    {
        printError("Semaphore init failed, error code : %d \r\n", ret);
        return;
    }
    Display_printf(display,0,0,"At start of application\n\r");
    /* Start the SimpleLink Host */
    pthread_attr_init(&pAttrs_spawn);
    priParam.sched_priority = SPAWN_TASK_PRIORITY;
    status = pthread_attr_setschedparam(&pAttrs_spawn, &priParam);
    status |= pthread_attr_setstacksize(&pAttrs_spawn, SPAWN_STACK_SIZE);

    status = pthread_create(&spawn_thread, &pAttrs_spawn, sl_Task, NULL);
    if(status)
    {
        printError("Task create failed, error code : %d \r\n", status);
    }

    /* initialize the device */

    mode = sl_Start(0, 0, 0);
    Display_printf(display,0,0,"sl_Start return code %d\n\r",mode);
    if (mode == SL_ERROR_RESTORE_IMAGE_COMPLETE )
    {
        Display_printf(display,0,0,"Received factory reset status code. Resetting MCU...");
        PRCMMCUReset(1);

    }
    else if (mode < 0)
    {
        printError("Sl_start failed, error code : %d \r\n", status);
    }

    /* Perform factory reset */
    _i32 slRetVal;
    SlFsRetToFactoryCommand_t RetToFactoryCommand;
    _i32 Status, ExtendedStatus;
    RetToFactoryCommand.Operation = SL_FS_FACTORY_RET_TO_IMAGE;
    Status = sl_FsCtl( (SlFsCtl_e)SL_FS_CTL_RESTORE, 0, NULL , (_u8 *)&RetToFactoryCommand ,
    sizeof(SlFsRetToFactoryCommand_t), NULL, 0 , NULL );
    if ((_i32)Status < 0)
    {
    /*error*/
    //Status is composed from Signed error number & extended status
    Status = (_i16)Status>> 16;
    ExtendedStatus = (_u16)slRetVal& 0xFFFF;
    Display_printf(display,0,0,"factory reset failed, error status : %d, extended status: %d\r\n", Status, ExtendedStatus);
    }
    //Reset
    Display_printf(display,0,0,"stopping sl %d\n\r",mode);
    sl_Stop(10);
    Display_printf(display,0,0,"starting sl\n\r",mode);
    mode = sl_Start(NULL, NULL, NULL);
    if (mode == SL_ERROR_RESTORE_IMAGE_COMPLETE )
    {
        Display_printf(display,0,0,"Received factory reset status code. Resetting MCU...");
        PRCMMCUReset(1);

    }
    else if (mode < 0)
    {
        printError("Sl_start failed, error code : %d \r\n", status);
        while(1){
            ;
        }
    }
    //CC3220
    PRCMMCUReset(1);
}

Give that a try and see if that helps clear up some of the questions you might have. If you are still confused about how this process works, feel free to let me know.