/************************************************************************************//**
* \file         Demo/ARMCM4_STM32F3_Discovery_F303VC_CubeIDE/Boot/App/hooks.c
* \brief        Bootloader callback source file.
* \ingroup      Boot_ARMCM4_STM32F3_Discovery_F303VC_CubeIDE
* \internal
*----------------------------------------------------------------------------------------
*                          C O P Y R I G H T
*----------------------------------------------------------------------------------------
*   Copyright (c) 2020  by Feaser    http://www.feaser.com    All rights reserved
*
*----------------------------------------------------------------------------------------
*                            L I C E N S E
*----------------------------------------------------------------------------------------
* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You have received a copy of the GNU General Public License along with OpenBLT. It
* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
*
* \endinternal
****************************************************************************************/

/****************************************************************************************
* Include files
****************************************************************************************/
#include "boot.h"                                /* bootloader generic header          */
#include "led.h"                                 /* LED driver header                  */
#include "stm32f3xx.h"                           /* STM32 CPU and HAL header           */
#include "stm32f3xx_ll_gpio.h"                   /* STM32 LL GPIO header               */


/****************************************************************************************
*   C P U   D R I V E R   H O O K   F U N C T I O N S
****************************************************************************************/

#if (BOOT_CPU_USER_PROGRAM_START_HOOK > 0)
/************************************************************************************//**
** \brief     Callback that gets called when the bootloader is about to exit and
**            hand over control to the user program. This is the last moment that
**            some final checking can be performed and if necessary prevent the
**            bootloader from activiting the user program.
** \return    BLT_TRUE if it is okay to start the user program, BLT_FALSE to keep
**            keep the bootloader active.
**
****************************************************************************************/
blt_bool CpuUserProgramStartHook(void)
{
  /* additional and optional backdoor entry through the pushbutton on the board. to
   * force the bootloader to stay active after reset, keep the pushbutton pressed 
   * during reset.
   */
  if (LL_GPIO_IsInputPinSet(GPIOA, LL_GPIO_PIN_0) != 0)
  {
    /* pushbutton pressed, so do not start the user program and keep the
     * bootloader active instead.
     */
    return BLT_FALSE;
  }
  /* clean up the LED driver */
  LedBlinkExit();
  /*  okay to start the user program.*/
  return BLT_TRUE;
} /*** end of CpuUserProgramStartHook ***/
#endif /* BOOT_CPU_USER_PROGRAM_START_HOOK > 0 */


/****************************************************************************************
*   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)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  if (connect == BLT_TRUE)
  {
    /* To connect the USB device to the USB bus, a pull-up needs to be enabled on the
     * USB_DP line, such that it provides a logic high signal to the host. On the
     * STM32F3-Discovery board, there is already a pull-up that is always enabled. This
     * means that the USB_DP line is already high as long as it is not explicitely
     * configured as a digital output and set to logic low. Function HAL_PCD_MspInit()
     * already properly configures the USB_DP pin for USB operation, so nothing more
     * need to be done here.
     */
  }
  else
  {
    /* To disconnect the USB device from the USB bus, the USB_DP line needs to go to
     * logic low. On the STM32F3-Discovery board, there is a pullup on this line that is
     * always enabled. This means that there is only one way to make the USB_DP go logic
     * low, which is by reconfiguring the pin as a digital output and setting it low.
     */
    GPIO_InitStruct.Pin = GPIO_PIN_12;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_12, GPIO_PIN_RESET);
  }
} /*** end of UsbConnect ***/


/************************************************************************************//**
** \brief     Callback that gets called whenever the USB host requests the device
**            to enter a low power mode.
** \return    none.
**
****************************************************************************************/
void UsbEnterLowPowerModeHook(void)
{
  /* support to enter a low power mode can be implemented here */
} /*** end of UsbEnterLowPowerMode ***/


/************************************************************************************//**
** \brief     Callback that gets called whenever the USB host requests the device to
**            exit low power mode.
** \return    none.
**
****************************************************************************************/
void UsbLeaveLowPowerModeHook(void)
{
  /* support to leave a low power mode can be implemented here */
} /*** end of UsbLeaveLowPowerMode ***/
#endif /* BOOT_COM_USB_ENABLE > 0 */


/****************************************************************************************
*   W A T C H D O G   D R I V E R   H O O K   F U N C T I O N S
****************************************************************************************/

#if (BOOT_COP_HOOKS_ENABLE > 0)
/************************************************************************************//**
** \brief     Callback that gets called at the end of the internal COP driver
**            initialization routine. It can be used to configure and enable the
**            watchdog.
** \return    none.
**
****************************************************************************************/
void CopInitHook(void)
{
  /* this function is called upon initialization. might as well use it to initialize
   * the LED driver. It is kind of a visual watchdog anyways.
   */
  LedBlinkInit(100);
} /*** end of CopInitHook ***/


/************************************************************************************//**
** \brief     Callback that gets called at the end of the internal COP driver
**            service routine. This gets called upon initialization and during
**            potential long lasting loops and routine. It can be used to service
**            the watchdog to prevent a watchdog reset.
** \return    none.
**
****************************************************************************************/
void CopServiceHook(void)
{
  /* run the LED blink task. this is a better place to do it than in the main() program
   * loop. certain operations such as flash erase can take a long time, which would cause
   * a blink interval to be skipped. this function is also called during such operations,
   * so no blink intervals will be skipped when calling the LED blink task here.
   */
  LedBlinkTask();
} /*** end of CopServiceHook ***/
#endif /* BOOT_COP_HOOKS_ENABLE > 0 */


/****************************************************************************************
*   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)
{
} /*** 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)
{
  /* default implementation always activates the bootloader after a reset */
  return BLT_TRUE;
} /*** end of BackDoorEntryHook ***/
#endif /* BOOT_BACKDOOR_HOOKS_ENABLE > 0 */


/****************************************************************************************
*   N O N - V O L A T I L E   M E M O R Y   D R I V E R   H O O K   F U N C T I O N S
****************************************************************************************/

#if (BOOT_NVM_HOOKS_ENABLE > 0)
/************************************************************************************//**
** \brief     Callback that gets called at the start of the internal NVM driver
**            initialization routine.
** \return    none.
**
****************************************************************************************/
void NvmInitHook(void)
{
} /*** end of NvmInitHook ***/


/************************************************************************************//**
** \brief     Callback that gets called at the start of a firmware update to reinitialize
**            the NVM driver.
** \return    none.
**
****************************************************************************************/
void NvmReinitHook(void)
{
} /*** end of NvmReinitHook ***/


/************************************************************************************//**
** \brief     Callback that gets called at the start of the NVM driver write
**            routine. It allows additional memory to be operated on. If the address
**            is not within the range of the additional memory, then
**            BLT_NVM_NOT_IN_RANGE must be returned to indicate that the data hasn't
**            been written yet.
** \param     addr Start address.
** \param     len  Length in bytes.
** \param     data Pointer to the data buffer.
** \return    BLT_NVM_OKAY if successful, BLT_NVM_NOT_IN_RANGE if the address is
**            not within the supported memory range, or BLT_NVM_ERROR is the write
**            operation failed.
**
****************************************************************************************/
blt_int8u NvmWriteHook(blt_addr addr, blt_int32u len, blt_int8u *data)
{
  return BLT_NVM_NOT_IN_RANGE;
} /*** end of NvmWriteHook ***/


/************************************************************************************//**
** \brief     Callback that gets called at the start of the NVM driver erase
**            routine. It allows additional memory to be operated on. If the address
**            is not within the range of the additional memory, then
**            BLT_NVM_NOT_IN_RANGE must be returned to indicate that the memory
**            hasn't been erased yet.
** \param     addr Start address.
** \param     len  Length in bytes.
** \return    BLT_NVM_OKAY if successful, BLT_NVM_NOT_IN_RANGE if the address is
**            not within the supported memory range, or BLT_NVM_ERROR is the erase
**            operation failed.
**
****************************************************************************************/
blt_int8u NvmEraseHook(blt_addr addr, blt_int32u len)
{
  return BLT_NVM_NOT_IN_RANGE;
} /*** end of NvmEraseHook ***/


/************************************************************************************//**
** \brief     Callback that gets called at the end of the NVM programming session.
** \return    BLT_TRUE is successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool NvmDoneHook(void)
{
  return BLT_TRUE;
} /*** end of NvmDoneHook ***/
#endif /* BOOT_NVM_HOOKS_ENABLE > 0 */


#if (BOOT_NVM_CHECKSUM_HOOKS_ENABLE > 0)
/************************************************************************************//**
** \brief     Verifies the checksum, which indicates that a valid user program is
**            present and can be started.
** \return    BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool NvmVerifyChecksumHook(void)
{
  return BLT_TRUE;
} /*** end of NvmVerifyChecksum ***/


/************************************************************************************//**
** \brief     Writes a checksum of the user program to non-volatile memory. This is
**            performed once the entire user program has been programmed. Through
**            the checksum, the bootloader can check if a valid user programming is
**            present and can be started.
** \return    BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
blt_bool NvmWriteChecksumHook(void)
{
  return BLT_TRUE;
}
#endif /* BOOT_NVM_CHECKSUM_HOOKS_ENABLE > 0 */


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

#if (BOOT_XCP_SEED_KEY_ENABLE > 0)
/************************************************************************************//**
** \brief     Provides a seed to the XCP master that will be used for the key
**            generation when the master attempts to unlock the specified resource.
**            Called by the GET_SEED command.
** \param     resource  Resource that the seed if requested for (XCP_RES_XXX).
** \param     seed      Pointer to byte buffer wher the seed will be stored.
** \return    Length of the seed in bytes.
**
****************************************************************************************/
blt_int8u XcpGetSeedHook(blt_int8u resource, blt_int8u *seed)
{
  /* request seed for unlocking ProGraMming resource */
  if ((resource & XCP_RES_PGM) != 0)
  {
    seed[0] = 0x55;
  }

  /* return seed length */
  return 1;
} /*** end of XcpGetSeedHook ***/


/************************************************************************************//**
** \brief     Called by the UNLOCK command and checks if the key to unlock the
**            specified resource was correct. If so, then the resource protection
**            will be removed.
** \param     resource  resource to unlock (XCP_RES_XXX).
** \param     key       pointer to the byte buffer holding the key.
** \param     len       length of the key in bytes.
** \return    1 if the key was correct, 0 otherwise.
**
****************************************************************************************/
blt_int8u XcpVerifyKeyHook(blt_int8u resource, blt_int8u *key, blt_int8u len)
{
  /* suppress compiler warning for unused parameter */
  len = len;

  /* the example key algorithm in "libseednkey.dll" works as follows:
   *  - PGM will be unlocked if key = seed - 1
   */

  /* check key for unlocking ProGraMming resource */
  if ((resource == XCP_RES_PGM) && (key[0] == (0x55-1)))
  {
    /* correct key received for unlocking PGM resource */
    return 1;
  }

  /* still here so key incorrect */
  return 0;
} /*** end of XcpVerifyKeyHook ***/
#endif /* BOOT_XCP_SEED_KEY_ENABLE > 0 */


/*********************************** end of hooks.c ************************************/