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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
*/
#include <stdio.h>
#include <string.h>
#include "eeprom_stm32.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.
******************************************************************************/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Functions -----------------------------------------------------------------*/
uint8_t DataBuf[FEE_PAGE_SIZE];
/*****************************************************************************
* 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) {
// unlock flash
FLASH_Unlock();
// Clear Flags
// FLASH_ClearFlag(FLASH_SR_EOP|FLASH_SR_PGERR|FLASH_SR_WRPERR);
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 {
FLASH_ErasePage(FEE_PAGE_BASE_ADDRESS + (page_num * FEE_PAGE_SIZE));
page_num++;
} while (page_num < FEE_DENSITY_PAGES);
}
/*****************************************************************************
* Writes once data byte to flash on specified address. If a byte is already
* written, the whole page must be copied to a buffer, the byte changed and
* the manipulated buffer written after PageErase.
*******************************************************************************/
uint16_t EEPROM_WriteDataByte(uint16_t Address, uint8_t DataByte) {
FLASH_Status FlashStatus = FLASH_COMPLETE;
uint32_t page;
int i;
// exit if desired address is above the limit (e.G. under 2048 Bytes for 4 pages)
if (Address > FEE_DENSITY_BYTES) {
return 0;
}
// calculate which page is affected (Pagenum1/Pagenum2...PagenumN)
page = FEE_ADDR_OFFSET(Address) / FEE_PAGE_SIZE;
// if current data is 0xFF, the byte is empty, just overwrite with the new one
if ((*(__IO uint16_t *)(FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address))) == FEE_EMPTY_WORD) {
FlashStatus = FLASH_ProgramHalfWord(FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address), (uint16_t)(0x00FF & DataByte));
} else {
// Copy Page to a buffer
memcpy(DataBuf, (uint8_t *)FEE_PAGE_BASE_ADDRESS + (page * FEE_PAGE_SIZE), FEE_PAGE_SIZE); // !!! Calculate base address for the desired page
// check if new data is differ to current data, return if not, proceed if yes
if (DataByte == *(__IO uint8_t *)(FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address))) {
return 0;
}
// manipulate desired data byte in temp data array if new byte is differ to the current
DataBuf[FEE_ADDR_OFFSET(Address) % FEE_PAGE_SIZE] = DataByte;
// Erase Page
FlashStatus = FLASH_ErasePage(FEE_PAGE_BASE_ADDRESS + (page * FEE_PAGE_SIZE));
// Write new data (whole page) to flash if data has been changed
for (i = 0; i < (FEE_PAGE_SIZE / 2); i++) {
if ((__IO uint16_t)(0xFF00 | DataBuf[FEE_ADDR_OFFSET(i)]) != 0xFFFF) {
FlashStatus = FLASH_ProgramHalfWord((FEE_PAGE_BASE_ADDRESS + (page * FEE_PAGE_SIZE)) + (i * 2), (uint16_t)(0xFF00 | DataBuf[FEE_ADDR_OFFSET(i)]));
}
}
}
return FlashStatus;
}
/*****************************************************************************
* Read once data byte from a specified address.
*******************************************************************************/
uint8_t EEPROM_ReadDataByte(uint16_t Address) {
uint8_t DataByte = 0xFF;
// Get Byte from specified address
DataByte = (*(__IO uint8_t *)(FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address)));
return DataByte;
}
/*****************************************************************************
* Wrap library in AVR style functions.
*******************************************************************************/
uint8_t eeprom_read_byte(const uint8_t *Address) {
const uint16_t p = (const uint32_t)Address;
return EEPROM_ReadDataByte(p);
}
void eeprom_write_byte(uint8_t *Address, uint8_t Value) {
uint16_t p = (uint32_t)Address;
EEPROM_WriteDataByte(p, Value);
}
void eeprom_update_byte(uint8_t *Address, uint8_t Value) {
uint16_t p = (uint32_t)Address;
EEPROM_WriteDataByte(p, Value);
}
uint16_t eeprom_read_word(const uint16_t *Address) {
const uint16_t p = (const uint32_t)Address;
return EEPROM_ReadDataByte(p) | (EEPROM_ReadDataByte(p + 1) << 8);
}
void eeprom_write_word(uint16_t *Address, uint16_t Value) {
uint16_t p = (uint32_t)Address;
EEPROM_WriteDataByte(p, (uint8_t)Value);
EEPROM_WriteDataByte(p + 1, (uint8_t)(Value >> 8));
}
void eeprom_update_word(uint16_t *Address, uint16_t Value) {
uint16_t p = (uint32_t)Address;
EEPROM_WriteDataByte(p, (uint8_t)Value);
EEPROM_WriteDataByte(p + 1, (uint8_t)(Value >> 8));
}
uint32_t eeprom_read_dword(const uint32_t *Address) {
const uint16_t p = (const uint32_t)Address;
return EEPROM_ReadDataByte(p) | (EEPROM_ReadDataByte(p + 1) << 8) | (EEPROM_ReadDataByte(p + 2) << 16) | (EEPROM_ReadDataByte(p + 3) << 24);
}
void eeprom_write_dword(uint32_t *Address, uint32_t Value) {
uint16_t p = (const uint32_t)Address;
EEPROM_WriteDataByte(p, (uint8_t)Value);
EEPROM_WriteDataByte(p + 1, (uint8_t)(Value >> 8));
EEPROM_WriteDataByte(p + 2, (uint8_t)(Value >> 16));
EEPROM_WriteDataByte(p + 3, (uint8_t)(Value >> 24));
}
void eeprom_update_dword(uint32_t *Address, uint32_t Value) {
uint16_t p = (const uint32_t)Address;
uint32_t existingValue = EEPROM_ReadDataByte(p) | (EEPROM_ReadDataByte(p + 1) << 8) | (EEPROM_ReadDataByte(p + 2) << 16) | (EEPROM_ReadDataByte(p + 3) << 24);
if (Value != existingValue) {
EEPROM_WriteDataByte(p, (uint8_t)Value);
EEPROM_WriteDataByte(p + 1, (uint8_t)(Value >> 8));
EEPROM_WriteDataByte(p + 2, (uint8_t)(Value >> 16));
EEPROM_WriteDataByte(p + 3, (uint8_t)(Value >> 24));
}
}
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_read_byte(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_write_byte(p++, *src++);
}
}
void eeprom_update_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_write_byte(p++, *src++);
}
}
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