text: /* mbed Microcontroller Library
   * SPDX-License-Identifier: BSD-3-Clause
   ******************************************************************************
   *
   * Copyright (c) 2016-2020 STMicroelectronics.
   * All rights reserved.
   *
   * This software component is licensed by ST under BSD 3-Clause license,
   * the "License"; You may not use this file except in compliance with the
   * License. You may obtain a copy of the License at:
   *                        opensource.org/licenses/BSD-3-Clause
   *
   ******************************************************************************
   */
  
  #include "flash_api.h"
  #include "platform/mbed_critical.h"
  
  #if DEVICE_FLASH
  #include "mbed_assert.h"
  #include "cmsis.h"
  
  /*  L1 targets embed 16 pages sectors */
  #define NUM_PAGES_IN_SECTOR 16
  
  int32_t flash_init(flash_t *obj)
  {
      return 0;
  }
  
  int32_t flash_free(flash_t *obj)
  {
      return 0;
  }
  
  int32_t flash_erase_sector(flash_t *obj, uint32_t address)
  {
      uint32_t PAGEError = 0;
      FLASH_EraseInitTypeDef EraseInitStruct;
      int32_t status = 0;
  
      if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) {
  
          return -1;
      }
  
      if (HAL_FLASH_Unlock() != HAL_OK) {
          return -1;
      }
  
      core_util_critical_section_enter();
  
      __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR | FLASH_FLAG_EOP | FLASH_FLAG_PGAERR | FLASH_FLAG_WRPERR);
      /* MBED HAL erases 1 sector at a time */
      /* Fill EraseInit structure*/
      EraseInitStruct.TypeErase   = FLASH_TYPEERASE_PAGES;
      EraseInitStruct.PageAddress = address;
      EraseInitStruct.NbPages     = NUM_PAGES_IN_SECTOR;
  
      /* Note: If an erase operation in Flash memory also concerns data in the data or instruction cache,
       you have to make sure that these data are rewritten before they are accessed during code
       execution. If this cannot be done safely, it is recommended to flush the caches by setting the
       DCRST and ICRST bits in the FLASH_CR register. */
  
      if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK) {
          status = -1;
      }
  
      core_util_critical_section_exit();
  
      if (HAL_FLASH_Lock() != HAL_OK) {
          return -1;
      }
  
      return status;
  
  }
  
  int32_t flash_program_page(flash_t *obj, uint32_t address,
                             const uint8_t *data, uint32_t size)
  {
      uint32_t StartAddress = 0;
      int32_t status = 0;
  
      if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) {
          return -1;
      }
  
      if ((size % 4) != 0) {
          /* L1 flash devices can only be programmed 32bits/4 bytes at a time */
          return -1;
      }
  
      if (HAL_FLASH_Unlock() != HAL_OK) {
          return -1;
      }
  
      /* Program the user Flash area word by word */
      StartAddress = address;
  
      /*  HW needs an aligned address to program flash, which data
       *  parameters doesn't ensure  */
      if ((uint32_t) data % 4 != 0) {
          volatile uint32_t data32;
          while (address < (StartAddress + size) && (status == 0)) {
              for (uint8_t i = 0; i < 4; i++) {
                  *(((uint8_t *) &data32) + i) = *(data + i);
              }
  
              if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, data32) == HAL_OK) {
                  address = address + 4;
                  data = data + 4;
              } else {
                  status = -1;
              }
          }
      } else { /*  case where data is aligned, so let's avoid any copy */
          while ((address < (StartAddress + size)) && (status == 0)) {
              if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, *((uint32_t *) data)) == HAL_OK) {
                  address = address + 4;
                  data = data + 4;
              } else {
                  status = -1;
              }
          }
      }
  
      if (HAL_FLASH_Lock() != HAL_OK) {
          return -1;
      }
  
      return status;
  }
  
  uint32_t flash_get_sector_size(const flash_t *obj, uint32_t address)
  {
      if ((address >= (FLASH_BASE + FLASH_SIZE)) || (address < FLASH_BASE)) {
          return MBED_FLASH_INVALID_SIZE;
      } else {
          return (NUM_PAGES_IN_SECTOR * FLASH_PAGE_SIZE);
      }
  }
  
  uint32_t flash_get_page_size(const flash_t *obj)
  {
      /*  Page size is the minimum programable size, which 4 bytes */
      return 4;
  }
  
  uint32_t flash_get_start_address(const flash_t *obj)
  {
      return FLASH_BASE;
  }
  
  uint32_t flash_get_size(const flash_t *obj)
  {
      return FLASH_SIZE;
  }
  
  uint8_t flash_get_erase_value(const flash_t *obj)
  {
      (void)obj;
  
      return 0x0;
  }
  
  #endif
  