/*
 * This software is experimental and a work in progress.
 * Under no circumstances should these files be used in relation to any critical system(s).
 * Use of these files is at your own risk.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * This files are free to use from http://engsta.com/stm32-flash-memory-eeprom-emulator/ by
 * Artur F.
 *
 * Modifications for QMK and STM32F303 by Yiancar
 *
 * This library assumes 8-bit data locations. To add a new MCU, please provide the flash
 * page size and the total flash size in Kb. The number of available pages must be a multiple
 * of 2. Only half of the pages account for the total EEPROM size.
 * This library also assumes that the pages are not used by the firmware.
 */

#ifndef __EEPROM_H
#define __EEPROM_H

#include "ch.h"
#include "hal.h"
#include "flash_stm32.h"

// HACK ALERT. This definition may not match your processor
// To Do. Work out correct value for EEPROM_PAGE_SIZE on the STM32F103CT6 etc
#if defined(EEPROM_EMU_STM32F303xC)
  #define MCU_STM32F303CC
#elif defined(EEPROM_EMU_STM32F103xB)
  #define MCU_STM32F103RB
#else
  #error "not implemented."
#endif

#ifndef EEPROM_PAGE_SIZE
    #if defined (MCU_STM32F103RB)
        #define FEE_PAGE_SIZE    (uint16_t)0x400 // Page size = 1KByte
        #define FEE_DENSITY_PAGES          2     // How many pages are used
    #elif defined (MCU_STM32F103ZE) || defined (MCU_STM32F103RE) || defined (MCU_STM32F103RD) || defined (MCU_STM32F303CC)
        #define FEE_PAGE_SIZE    (uint16_t)0x800 // Page size = 2KByte
        #define FEE_DENSITY_PAGES          4     // How many pages are used
    #else
        #error  "No MCU type specified. Add something like -DMCU_STM32F103RB to your compiler arguments (probably in a Makefile)."
    #endif
#endif

#ifndef EEPROM_START_ADDRESS
    #if defined (MCU_STM32F103RB)
        #define FEE_MCU_FLASH_SIZE  128     // Size in Kb
    #elif defined (MCU_STM32F103ZE) || defined (MCU_STM32F103RE)
        #define FEE_MCU_FLASH_SIZE  512     // Size in Kb
    #elif defined (MCU_STM32F103RD)
        #define FEE_MCU_FLASH_SIZE  384     // Size in Kb
    #elif defined (MCU_STM32F303CC)
        #define FEE_MCU_FLASH_SIZE  256     // Size in Kb
    #else
        #error  "No MCU type specified. Add something like -DMCU_STM32F103RB to your compiler arguments (probably in a Makefile)."
    #endif
#endif

// DONT CHANGE
// Choose location for the first EEPROM Page address on the top of flash
#define FEE_PAGE_BASE_ADDRESS ((uint32_t)(0x8000000 + FEE_MCU_FLASH_SIZE * 1024 - FEE_DENSITY_PAGES * FEE_PAGE_SIZE))
#define FEE_DENSITY_BYTES       ((FEE_PAGE_SIZE / 2) * FEE_DENSITY_PAGES - 1)
#define FEE_LAST_PAGE_ADDRESS   (FEE_PAGE_BASE_ADDRESS + (FEE_PAGE_SIZE * FEE_DENSITY_PAGES))
#define FEE_EMPTY_WORD          ((uint16_t)0xFFFF)
#define FEE_ADDR_OFFSET(Address)(Address * 2) // 1Byte per Word will be saved to preserve Flash

// Use this function to initialize the functionality
uint16_t EEPROM_Init(void);
void EEPROM_Erase (void);
uint16_t EEPROM_WriteDataByte (uint16_t Address, uint8_t DataByte);
uint8_t EEPROM_ReadDataByte (uint16_t Address);

#endif  /* __EEPROM_H */