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/*
* 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
* Adapted for SONIX chips by dexter93 and gloryhzw
*/
#include <stdio.h>
#include <string.h>
#include "debug.h"
#include "Flash.h"
#include "eeprom_sn32.h"
/*****************************************************************************
* Allows to use the internal flash to store non volatile data. To initialize
* the functionality use the EEPROM_Init() function. Be sure that by reprogramming
* of the controller just affected pages will be deleted. In other case the non
* volatile data will be lost.
******************************************************************************/
#include "eeprom_sn32_defs.h"
#if !defined(FEE_PAGE_SIZE) || !defined(FEE_TOTAL_PAGES) || !defined(FEE_DENSITY_PAGES) || !defined(FEE_MCU_FLASH_SIZE) || !defined(FEE_PAGE_BASE_ADDRESS)
# error "not implemented."
#endif
#define FEE_DENSITY_BYTES (FEE_PAGE_SIZE * FEE_DENSITY_PAGES - 1)
#define FEE_LAST_PAGE_ADDRESS (FEE_PAGE_BASE_ADDRESS + (FEE_PAGE_SIZE * FEE_DENSITY_PAGES))
#define FEE_ADDR_OFFSET(Address) (Address)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Functions -----------------------------------------------------------------*/
/*
* Debug print utils
*/
// #define DEBUG_EEPROM_OUTPUT
#if defined(DEBUG_EEPROM_OUTPUT)
# define debug_eeprom debug_enable
# define eeprom_println(s) println(s)
# define eeprom_printf(fmt, ...) xprintf(fmt, ##__VA_ARGS__);
#else /* NO_DEBUG */
# define debug_eeprom false
# define eeprom_println(s)
# define eeprom_printf(fmt, ...)
#endif /* NO_DEBUG */
/*****************************************************************************
* Delete Flash Space used for user Data, deletes the whole space between
* RW_PAGE_BASE_ADDRESS and the last uC Flash Page
******************************************************************************/
uint16_t EEPROM_Init(void) {
// Clear Flags
// SN_FLASH->STATUS &= ~FLASH_PGERR
if (debug_eeprom) {
println("EEPROM_Init");
}
return FEE_DENSITY_BYTES;
}
/*****************************************************************************
* Erase the whole reserved Flash Space used for user Data
******************************************************************************/
void EEPROM_Erase(void) {
int page_num = 0;
// delete all pages from specified start page to the last page
do {
eeprom_println("EEPROM_Erase");
FLASH_EraseSector(FEE_PAGE_BASE_ADDRESS + (page_num * FEE_PAGE_SIZE));
page_num++;
} while (page_num < FEE_DENSITY_PAGES);
}
/*****************************************************************************
* Writes data to flash on specified address.
*******************************************************************************/
uint8_t EEPROM_WriteDataByte(uint16_t Address, uint8_t DataByte) {
FLASH_Status FlashStatus = FLASH_OKAY;
/* if the address is out-of-bounds, do nothing */
if (Address > FEE_DENSITY_BYTES) {
eeprom_printf("EEPROM_WriteDataByte(0x%04x, 0x%02x) [BAD ADDRESS]\n", Address, DataByte);
return FLASH_FAIL;
}
uint32_t addr = FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address);
/* if the value is the same, don't bother writing it */
if (DataByte == *(__IO uint8_t *)addr) {
eeprom_printf("EEPROM_WriteDataByte(0x%04x, 0x%02x) [SKIP SAME]\n", Address, DataByte);
return FLASH_OKAY;
}
// update the data byte aligned in a 32-bit dword
uint32_t value = *((uint32_t*)(addr & 0xFFFFFFFC));
uint8_t* v8 = (uint8_t*)&value;
v8[addr & 3] = DataByte;
// program the 32-bit dword
eeprom_printf("FLASH_ProgramDWord(0x%08x, 0x%04x) [DIRECT]\n", Address, value);
FlashStatus = FLASH_ProgramDWord(addr & 0xFFFFFFFC, value);
return FlashStatus;
}
/*****************************************************************************
* Read data from a specified address.
*******************************************************************************/
uint8_t EEPROM_ReadDataByte(uint16_t Address) {
uint8_t DataByte = 0xFF;
if (Address <= FEE_DENSITY_BYTES) {
// Get Byte from specified address
DataByte = (*(__IO uint8_t *)(FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address)));
}
eeprom_printf("EEPROM_ReadDataByte(0x%04x): 0x%02x\n", Address, DataByte);
return DataByte;
}
/*****************************************************************************
* Bind to eeprom_driver.c
*******************************************************************************/
void eeprom_driver_init(void) { EEPROM_Init(); }
void eeprom_driver_erase(void) { EEPROM_Erase(); }
void eeprom_read_block(void *buf, const void *addr, size_t len) {
const uint8_t *p = (const uint8_t *)addr;
uint8_t * dest = (uint8_t *)buf;
while (len--) {
*dest++ = EEPROM_ReadDataByte((uint16_t)(uint32_t)(p++));
}
}
void eeprom_write_block(const void *buf, void *addr, size_t len) {
uint8_t * p = (uint8_t *)addr;
const uint8_t *src = (const uint8_t *)buf;
while (len--) {
EEPROM_WriteDataByte((uint16_t)(uint32_t)p++, *src++);
}
}
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