Devo Loader. Now working Fully

/****************************************************************************************
*   U S B   C O M M U N I C A T I O N   I N T E R F A C E   H O O K   F U N C T I O N S
****************************************************************************************/

#if (BOOT_COM_USB_ENABLE > 0)
/************************************************************************************//**
** \brief     Callback that gets called whenever the USB device should be connected
**            to the USB bus. 
** \param     connect BLT_TRUE to connect and BLT_FALSE to disconnect.
** \return    none.
**
****************************************************************************************/
void UsbConnectHook(blt_bool connect)
{
  static blt_bool initialized = BLT_FALSE;

  /* the connection to the USB bus is typically controlled by software through a digital
   * output. the GPIO pin for this must be configured as such.
   */
  if (initialized == BLT_FALSE)
  {
    /* enable clock for PC11 pin peripheral (GPIOC) */
    RCC->APB2ENR |= (blt_int32u)(0x00000010);
    /* configure DIS (GPIOC11) as open drain digital output */
    /* first reset the configuration */
    GPIOC->CRH &= ~(blt_int32u)((blt_int32u)0xf << 12);
    /* CNF11[1:0] = %01 and MODE11[1:0] = %11 */
    GPIOC->CRH |= (blt_int32u)((blt_int32u)0x7 << 12);
    /* set to initialized as this part only has to be done once after reset */
    initialized = BLT_TRUE;
  }

  /* determine if the USB should be connected or disconnected */
  if (connect == BLT_TRUE)
  {
    /* the GPIO has a pull-up so to connect to the USB bus the pin needs to go low */
    GPIOC->BRR = (blt_int32u)((blt_int32u)0x1 << 11);
  }
  else
  {
    /* the GPIO has a pull-up so to disconnect to the USB bus the pin needs to go high */
    GPIOC->BSRR = (blt_int32u)((blt_int32u)0x1 << 11);
  }
} /*** end of UsbConnect ***/

/****************************************************************************************
*   U S B   C O M M U N I C A T I O N   I N T E R F A C E   H O O K   F U N C T I O N S
****************************************************************************************/

#if (BOOT_COM_USB_ENABLE > 0)
/************************************************************************************//**
** \brief     Callback that gets called whenever the USB device should be connected
**            to the USB bus. 
** \param     connect BLT_TRUE to connect and BLT_FALSE to disconnect.
** \return    none.
**
****************************************************************************************/
void UsbConnectHook(blt_bool connect)
{
  static blt_bool initialized = BLT_FALSE;

  /* the connection to the USB bus is typically controlled by software through a digital
   * output. the GPIO pin for this must be configured as such.
   */
  if (initialized == BLT_FALSE)
  {
    /* enable clock for PC10 pin peripheral (GPIOB) */
    RCC->APB2ENR |= (blt_int32u)(0x00000008);
    /* configure DIS (GPIOB10) as open drain digital output */
    /* first reset the configuration */
    GPIOB->CRH &= ~(blt_int32u)((blt_int32u)0xf << 8);
    /* CNF11[1:0] = %01 and MODE11[1:0] = %11 */
    GPIOB->CRH |= (blt_int32u)((blt_int32u)0x7 << 8);
    /* set to initialized as this part only has to be done once after reset */
    initialized = BLT_TRUE;
  }

  /* determine if the USB should be connected or disconnected */
  if (connect == BLT_TRUE)
  {
    /* the GPIO has a pull-up so to connect to the USB bus the pin needs to go low */
    GPIOB->BRR = (blt_int32u)((blt_int32u)0x1 << 10);
  }
  else
  {
    /* the GPIO has a pull-up so to disconnect to the USB bus the pin needs to go high */
    GPIOB->BSRR = (blt_int32u)((blt_int32u)0x1 << 10);
  }
} /*** end of UsbConnect ***/

/****************************************************************************************
*   B A C K D O O R   E N T R Y   H O O K   F U N C T I O N S
****************************************************************************************/

#if (BOOT_BACKDOOR_HOOKS_ENABLE > 0)
/************************************************************************************//**
** \brief     Initializes the backdoor entry option.
** \return    none.
**
****************************************************************************************/
void BackDoorInitHook(void)
{
  /* enable clock for PA0 pin peripheral (GPIOA) */
  RCC->APB2ENR |= (blt_int32u)(0x00000004);
  /* configure BUT (GPIOA0) as floating digital input */
  /* first reset the configuration */
  GPIOA->CRL &= ~(blt_int32u)((blt_int32u)0xf << 0);
  /* CNF0[1:0] = %01 and MODE0[1:0] = %00 */
  GPIOA->CRL |= (blt_int32u)((blt_int32u)0x4 << 0);
} /*** end of BackDoorInitHook ***/


/************************************************************************************//**
** \brief     Checks if a backdoor entry is requested.
** \return    BLT_TRUE if the backdoor entry is requested, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool BackDoorEntryHook(void)
{
  /* button PA0 has a pullup, so will read high by default. enter backdoor only when
   * this button is pressed. this is the case when it reads low */

  if ((GPIOA->IDR & ((blt_int32u)0x01)) == 0)
  {
    return BLT_TRUE;
  }
  return BLT_FALSE;
} /*** end of BackDoorEntryHook ***/
#endif /* BOOT_BACKDOOR_HOOKS_ENABLE > 0 */