Final HS60v2 changes. (#4790)

* initial commit, this now mostly works

- RGB controls work
- Dynamic keymap still broken due to eeprom
- Via works

* STM32 eeprom update

- Update EEPROM emulation library to handle 8bit data like AVR.
- This library also allows for multiple page pairs resulting in greater EEPROM size flexibility

* hs60 changes

* HS60 hhkb added

* Update keyboards/hs60/v2/config.h

Co-Authored-By: yiancar <yiangosyiangou@cytanet.com.cy>

7 files changed, 172 insertions, 648 deletions

diff --git a/tmk_core/common/chibios/eeprom_stm32.c b/tmk_core/common/chibios/eeprom_stm32.c
index a869985501..a15430d676 100755
--- a/tmk_core/common/chibios/eeprom_stm32.c
+++ b/tmk_core/common/chibios/eeprom_stm32.c
@@ -10,664 +10,206 @@
  * 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 https://github.com/rogerclarkmelbourne/Arduino_STM32 and
- * https://github.com/leaflabs/libmaple
+ * 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();
 
-    FLASH_Status EE_ErasePage(uint32_t);
-
-    uint16_t EE_CheckPage(uint32_t, uint16_t);
-    uint16_t EE_CheckErasePage(uint32_t, uint16_t);
-    uint16_t EE_Format(void);
-    uint32_t EE_FindValidPage(void);
-    uint16_t EE_GetVariablesCount(uint32_t, uint16_t);
-    uint16_t EE_PageTransfer(uint32_t, uint32_t, uint16_t);
-    uint16_t EE_VerifyPageFullWriteVariable(uint16_t, uint16_t);
-
-    uint32_t PageBase0 = EEPROM_PAGE0_BASE;
-    uint32_t PageBase1 = EEPROM_PAGE1_BASE;
-    uint32_t PageSize = EEPROM_PAGE_SIZE;
-    uint16_t Status = EEPROM_NOT_INIT;
-
-// See http://www.st.com/web/en/resource/technical/document/application_note/CD00165693.pdf
-
-/**
-  * @brief  Check page for blank
-  * @param  page base address
-  * @retval Success or error
-  *     EEPROM_BAD_FLASH:   page not empty after erase
-  *     EEPROM_OK:          page blank
-  */
-uint16_t EE_CheckPage(uint32_t pageBase, uint16_t status)
-{
-    uint32_t pageEnd = pageBase + (uint32_t)PageSize;
-
-    // Page Status not EEPROM_ERASED and not a "state"
-    if ((*(__IO uint16_t*)pageBase) != EEPROM_ERASED && (*(__IO uint16_t*)pageBase) != status)
-        return EEPROM_BAD_FLASH;
-    for(pageBase += 4; pageBase < pageEnd; pageBase += 4)
-        if ((*(__IO uint32_t*)pageBase) != 0xFFFFFFFF)  // Verify if slot is empty
-            return EEPROM_BAD_FLASH;
-    return EEPROM_OK;
-}
-
-/**
-  * @brief  Erase page with increment erase counter (page + 2)
-  * @param  page base address
-  * @retval Success or error
-  *         FLASH_COMPLETE: success erase
-  *         - Flash error code: on write Flash error
-  */
-FLASH_Status EE_ErasePage(uint32_t pageBase)
-{
-    FLASH_Status FlashStatus;
-    uint16_t data = (*(__IO uint16_t*)(pageBase));
-    if ((data == EEPROM_ERASED) || (data == EEPROM_VALID_PAGE) || (data == EEPROM_RECEIVE_DATA))
-        data = (*(__IO uint16_t*)(pageBase + 2)) + 1;
-    else
-        data = 0;
-
-    FlashStatus = FLASH_ErasePage(pageBase);
-    if (FlashStatus == FLASH_COMPLETE)
-        FlashStatus = FLASH_ProgramHalfWord(pageBase + 2, data);
-
-    return FlashStatus;
-}
+    // Clear Flags
+    //FLASH_ClearFlag(FLASH_SR_EOP|FLASH_SR_PGERR|FLASH_SR_WRPERR);
 
-/**
-  * @brief  Check page for blank and erase it
-  * @param  page base address
-  * @retval Success or error
-  *         - Flash error code: on write Flash error
-  *         - EEPROM_BAD_FLASH: page not empty after erase
-  *         - EEPROM_OK:            page blank
-  */
-uint16_t EE_CheckErasePage(uint32_t pageBase, uint16_t status)
-{
-    uint16_t FlashStatus;
-    if (EE_CheckPage(pageBase, status) != EEPROM_OK)
-    {
-        FlashStatus = EE_ErasePage(pageBase);
-        if (FlashStatus != FLASH_COMPLETE)
-            return FlashStatus;
-        return EE_CheckPage(pageBase, status);
-    }
-    return EEPROM_OK;
+    return FEE_DENSITY_BYTES;
 }
+/*****************************************************************************
+*  Erase the whole reserved Flash Space used for user Data
+******************************************************************************/
+void EEPROM_Erase (void) {
 
-/**
-  * @brief  Find valid Page for write or read operation
-  * @param  Page0: Page0 base address
-  *         Page1: Page1 base address
-  * @retval Valid page address (PAGE0 or PAGE1) or NULL in case of no valid page was found
-  */
-uint32_t EE_FindValidPage(void)
-{
-    uint16_t status0 = (*(__IO uint16_t*)PageBase0);        // Get Page0 actual status
-    uint16_t status1 = (*(__IO uint16_t*)PageBase1);        // Get Page1 actual status
-
-    if (status0 == EEPROM_VALID_PAGE && status1 == EEPROM_ERASED)
-        return PageBase0;
-    if (status1 == EEPROM_VALID_PAGE && status0 == EEPROM_ERASED)
-        return PageBase1;
-
-    return 0;
-}
+    int page_num = 0;
 
-/**
-  * @brief  Calculate unique variables in EEPROM
-  * @param  start: address of first slot to check (page + 4)
-  * @param  end: page end address
-  * @param  address: 16 bit virtual address of the variable to excluse (or 0XFFFF)
-  * @retval count of variables
-  */
-uint16_t EE_GetVariablesCount(uint32_t pageBase, uint16_t skipAddress)
-{
-    uint16_t varAddress, nextAddress;
-    uint32_t idx;
-    uint32_t pageEnd = pageBase + (uint32_t)PageSize;
-    uint16_t count = 0;
-
-    for (pageBase += 6; pageBase < pageEnd; pageBase += 4)
-    {
-        varAddress = (*(__IO uint16_t*)pageBase);
-        if (varAddress == 0xFFFF || varAddress == skipAddress)
-            continue;
-
-        count++;
-        for(idx = pageBase + 4; idx < pageEnd; idx += 4)
-        {
-            nextAddress = (*(__IO uint16_t*)idx);
-            if (nextAddress == varAddress)
-            {
-                count--;
-                break;
-            }
-        }
-    }
-    return count;
+    // 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) {
 
-/**
-  * @brief  Transfers last updated variables data from the full Page to an empty one.
-  * @param  newPage: new page base address
-  * @param  oldPage: old page base address
-  * @param  SkipAddress: 16 bit virtual address of the variable (or 0xFFFF)
-  * @retval Success or error status:
-  *           - FLASH_COMPLETE: on success
-  *           - EEPROM_OUT_SIZE: if valid new page is full
-  *           - Flash error code: on write Flash error
-  */
-uint16_t EE_PageTransfer(uint32_t newPage, uint32_t oldPage, uint16_t SkipAddress)
-{
-    uint32_t oldEnd, newEnd;
-    uint32_t oldIdx, newIdx, idx;
-    uint16_t address, data, found;
-    FLASH_Status FlashStatus;
-
-    // Transfer process: transfer variables from old to the new active page
-    newEnd = newPage + ((uint32_t)PageSize);
-
-    // Find first free element in new page
-    for (newIdx = newPage + 4; newIdx < newEnd; newIdx += 4)
-        if ((*(__IO uint32_t*)newIdx) == 0xFFFFFFFF)    // Verify if element
-            break;                                  //  contents are 0xFFFFFFFF
-    if (newIdx >= newEnd)
-        return EEPROM_OUT_SIZE;
-
-    oldEnd = oldPage + 4;
-    oldIdx = oldPage + (uint32_t)(PageSize - 2);
-
-    for (; oldIdx > oldEnd; oldIdx -= 4)
-    {
-        address = *(__IO uint16_t*)oldIdx;
-        if (address == 0xFFFF || address == SkipAddress)
-            continue;                       // it's means that power off after write data
-
-        found = 0;
-        for (idx = newPage + 6; idx < newIdx; idx += 4)
-            if ((*(__IO uint16_t*)(idx)) == address)
-            {
-                found = 1;
-                break;
-            }
-
-        if (found)
-            continue;
-
-        if (newIdx < newEnd)
-        {
-            data = (*(__IO uint16_t*)(oldIdx - 2));
-
-            FlashStatus = FLASH_ProgramHalfWord(newIdx, data);
-            if (FlashStatus != FLASH_COMPLETE)
-                return FlashStatus;
+    FLASH_Status FlashStatus = FLASH_COMPLETE;
 
-            FlashStatus = FLASH_ProgramHalfWord(newIdx + 2, address);
-            if (FlashStatus != FLASH_COMPLETE)
-                return FlashStatus;
+    uint32_t page;
+    int i;
 
-            newIdx += 4;
-        }
-        else
-            return EEPROM_OUT_SIZE;
+    // exit if desired address is above the limit (e.G. under 2048 Bytes for 4 pages)
+    if (Address > FEE_DENSITY_BYTES) {
+        return 0;
     }
 
-    // Erase the old Page: Set old Page status to EEPROM_EEPROM_ERASED status
-    data = EE_CheckErasePage(oldPage, EEPROM_ERASED);
-    if (data != EEPROM_OK)
-        return data;
+    // calculate which page is affected (Pagenum1/Pagenum2...PagenumN)
+    page = (FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address)) & 0x00000FFF;
 
-    // Set new Page status
-    FlashStatus = FLASH_ProgramHalfWord(newPage, EEPROM_VALID_PAGE);
-    if (FlashStatus != FLASH_COMPLETE)
-        return FlashStatus;
+    if (page % FEE_PAGE_SIZE) page = page + FEE_PAGE_SIZE;
+    page = (page / FEE_PAGE_SIZE) - 1;
 
-    return EEPROM_OK;
-}
+    // 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) {
 
-/**
-  * @brief  Verify if active page is full and Writes variable in EEPROM.
-  * @param  Address: 16 bit virtual address of the variable
-  * @param  Data: 16 bit data to be written as variable value
-  * @retval Success or error status:
-  *           - FLASH_COMPLETE: on success
-  *           - EEPROM_PAGE_FULL: if valid page is full (need page transfer)
-  *           - EEPROM_NO_VALID_PAGE: if no valid page was found
-  *           - EEPROM_OUT_SIZE: if EEPROM size exceeded
-  *           - Flash error code: on write Flash error
-  */
-uint16_t EE_VerifyPageFullWriteVariable(uint16_t Address, uint16_t Data)
-{
-    FLASH_Status FlashStatus;
-    uint32_t idx, pageBase, pageEnd, newPage;
-    uint16_t count;
-
-    // Get valid Page for write operation
-    pageBase = EE_FindValidPage();
-    if (pageBase == 0)
-        return  EEPROM_NO_VALID_PAGE;
-
-    // Get the valid Page end Address
-    pageEnd = pageBase + PageSize;          // Set end of page
-
-    for (idx = pageEnd - 2; idx > pageBase; idx -= 4)
-    {
-        if ((*(__IO uint16_t*)idx) == Address)      // Find last value for address
-        {
-            count = (*(__IO uint16_t*)(idx - 2));   // Read last data
-            if (count == Data)
-                return EEPROM_OK;
-            if (count == 0xFFFF)
-            {
-                FlashStatus = FLASH_ProgramHalfWord(idx - 2, Data); // Set variable data
-                if (FlashStatus == FLASH_COMPLETE)
-                    return EEPROM_OK;
-            }
-            break;
-        }
+        FlashStatus = FLASH_ProgramHalfWord(FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address), (uint16_t)(0x00FF & DataByte));
     }
+    else {
 
-    // Check each active page address starting from begining
-    for (idx = pageBase + 4; idx < pageEnd; idx += 4)
-        if ((*(__IO uint32_t*)idx) == 0xFFFFFFFF)               // Verify if element
-        {                                                   //  contents are 0xFFFFFFFF
-            FlashStatus = FLASH_ProgramHalfWord(idx, Data); // Set variable data
-            if (FlashStatus != FLASH_COMPLETE)
-                return FlashStatus;
-            FlashStatus = FLASH_ProgramHalfWord(idx + 2, Address);  // Set variable virtual address
-            if (FlashStatus != FLASH_COMPLETE)
-                return FlashStatus;
-            return EEPROM_OK;
-        }
-
-    // Empty slot not found, need page transfer
-    // Calculate unique variables in page
-    count = EE_GetVariablesCount(pageBase, Address) + 1;
-    if (count >= (PageSize / 4 - 1))
-        return EEPROM_OUT_SIZE;
-
-    if (pageBase == PageBase1)
-        newPage = PageBase0;        // New page address where variable will be moved to
-    else
-        newPage = PageBase1;
-
-    // Set the new Page status to RECEIVE_DATA status
-    FlashStatus = FLASH_ProgramHalfWord(newPage, EEPROM_RECEIVE_DATA);
-    if (FlashStatus != FLASH_COMPLETE)
-        return FlashStatus;
-
-    // Write the variable passed as parameter in the new active page
-    FlashStatus = FLASH_ProgramHalfWord(newPage + 4, Data);
-    if (FlashStatus != FLASH_COMPLETE)
-        return FlashStatus;
-
-    FlashStatus = FLASH_ProgramHalfWord(newPage + 6, Address);
-    if (FlashStatus != FLASH_COMPLETE)
-        return FlashStatus;
-
-    return EE_PageTransfer(newPage, pageBase, Address);
-}
-
-/*EEPROMClass::EEPROMClass(void)
-{
-    PageBase0 = EEPROM_PAGE0_BASE;
-    PageBase1 = EEPROM_PAGE1_BASE;
-    PageSize = EEPROM_PAGE_SIZE;
-    Status = EEPROM_NOT_INIT;
-}*/
-/*
-uint16_t EEPROM_init(uint32_t pageBase0, uint32_t pageBase1, uint32_t pageSize)
-{
-    PageBase0 = pageBase0;
-    PageBase1 = pageBase1;
-    PageSize = pageSize;
-    return EEPROM_init();
-}*/
+        // 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
 
-uint16_t EEPROM_init(void)
-{
-    uint16_t status0 = 6, status1 = 6;
-    FLASH_Status FlashStatus;
+        // 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;
+        }
 
-    FLASH_Unlock();
-    Status = EEPROM_NO_VALID_PAGE;
+        // manipulate desired data byte in temp data array if new byte is differ to the current
+        DataBuf[FEE_ADDR_OFFSET(Address)] = DataByte;
 
-    status0 = (*(__IO uint16_t *)PageBase0);
-    status1 = (*(__IO uint16_t *)PageBase1);
+        //Erase Page
+        FlashStatus = FLASH_ErasePage(FEE_PAGE_BASE_ADDRESS + page);
 
-    switch (status0)
-    {
-/*
-        Page0               Page1
-        -----               -----
-    EEPROM_ERASED       EEPROM_VALID_PAGE           Page1 valid, Page0 erased
-                        EEPROM_RECEIVE_DATA         Page1 need set to valid, Page0 erased
-                        EEPROM_ERASED               make EE_Format
-                        any                         Error: EEPROM_NO_VALID_PAGE
-*/
-    case EEPROM_ERASED:
-        if (status1 == EEPROM_VALID_PAGE)           // Page0 erased, Page1 valid
-            Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED);
-        else if (status1 == EEPROM_RECEIVE_DATA)    // Page0 erased, Page1 receive
-        {
-            FlashStatus = FLASH_ProgramHalfWord(PageBase1, EEPROM_VALID_PAGE);
-            if (FlashStatus != FLASH_COMPLETE)
-                Status = FlashStatus;
-            else
-                Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED);
-        }
-        else if (status1 == EEPROM_ERASED)          // Both in erased state so format EEPROM
-            Status = EEPROM_format();
-        break;
-/*
-        Page0               Page1
-        -----               -----
-    EEPROM_RECEIVE_DATA EEPROM_VALID_PAGE           Transfer Page1 to Page0
-                        EEPROM_ERASED               Page0 need set to valid, Page1 erased
-                        any                         EEPROM_NO_VALID_PAGE
-*/
-    case EEPROM_RECEIVE_DATA:
-        if (status1 == EEPROM_VALID_PAGE)           // Page0 receive, Page1 valid
-            Status = EE_PageTransfer(PageBase0, PageBase1, 0xFFFF);
-        else if (status1 == EEPROM_ERASED)          // Page0 receive, Page1 erased
-        {
-            Status = EE_CheckErasePage(PageBase1, EEPROM_ERASED);
-            if (Status == EEPROM_OK)
-            {
-                FlashStatus = FLASH_ProgramHalfWord(PageBase0, EEPROM_VALID_PAGE);
-                if (FlashStatus != FLASH_COMPLETE)
-                    Status = FlashStatus;
-                else
-                    Status = EEPROM_OK;
+        // Write new data (whole page) to flash if data has beed 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)]));
             }
         }
-        break;
-/*
-        Page0               Page1
-        -----               -----
-    EEPROM_VALID_PAGE   EEPROM_VALID_PAGE           Error: EEPROM_NO_VALID_PAGE
-                        EEPROM_RECEIVE_DATA         Transfer Page0 to Page1
-                        any                         Page0 valid, Page1 erased
-*/
-    case EEPROM_VALID_PAGE:
-        if (status1 == EEPROM_VALID_PAGE)           // Both pages valid
-            Status = EEPROM_NO_VALID_PAGE;
-        else if (status1 == EEPROM_RECEIVE_DATA)
-            Status = EE_PageTransfer(PageBase1, PageBase0, 0xFFFF);
-        else
-            Status = EE_CheckErasePage(PageBase1, EEPROM_ERASED);
-        break;
-/*
-        Page0               Page1
-        -----               -----
-        any             EEPROM_VALID_PAGE           Page1 valid, Page0 erased
-                        EEPROM_RECEIVE_DATA         Page1 valid, Page0 erased
-                        any                         EEPROM_NO_VALID_PAGE
-*/
-    default:
-        if (status1 == EEPROM_VALID_PAGE)
-            Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED);   // Check/Erase Page0
-        else if (status1 == EEPROM_RECEIVE_DATA)
-        {
-            FlashStatus = FLASH_ProgramHalfWord(PageBase1, EEPROM_VALID_PAGE);
-            if (FlashStatus != FLASH_COMPLETE)
-                Status = FlashStatus;
-            else
-                Status = EE_CheckErasePage(PageBase0, EEPROM_ERASED);
-        }
-        break;
-    }
-    return Status;
-}
-
-/**
-  * @brief  Erases PAGE0 and PAGE1 and writes EEPROM_VALID_PAGE / 0 header to PAGE0
-  * @param  PAGE0 and PAGE1 base addresses
-  * @retval Status of the last operation (Flash write or erase) done during EEPROM formating
-  */
-uint16_t EEPROM_format(void)
-{
-    uint16_t status;
-    FLASH_Status FlashStatus;
 
-    FLASH_Unlock();
-
-    // Erase Page0
-    status = EE_CheckErasePage(PageBase0, EEPROM_VALID_PAGE);
-    if (status != EEPROM_OK)
-        return status;
-    if ((*(__IO uint16_t*)PageBase0) == EEPROM_ERASED)
-    {
-        // Set Page0 as valid page: Write VALID_PAGE at Page0 base address
-        FlashStatus = FLASH_ProgramHalfWord(PageBase0, EEPROM_VALID_PAGE);
-        if (FlashStatus != FLASH_COMPLETE)
-            return FlashStatus;
     }
-    // Erase Page1
-    return EE_CheckErasePage(PageBase1, EEPROM_ERASED);
-}
-
-/**
-  * @brief  Returns the erase counter for current page
-  * @param  Data: Global variable contains the read variable value
-  * @retval Success or error status:
-  *         - EEPROM_OK: if erases counter return.
-  *         - EEPROM_NO_VALID_PAGE: if no valid page was found.
-  */
-uint16_t EEPROM_erases(uint16_t *Erases)
-{
-    uint32_t pageBase;
-    if (Status != EEPROM_OK)
-        if (EEPROM_init() != EEPROM_OK)
-            return Status;
-
-    // Get active Page for read operation
-    pageBase = EE_FindValidPage();
-    if (pageBase == 0)
-        return  EEPROM_NO_VALID_PAGE;
-
-    *Erases = (*(__IO uint16_t*)pageBase+2);
-    return EEPROM_OK;
-}
-
-/**
-  * @brief  Returns the last stored variable data, if found,
-  *         which correspond to the passed virtual address
-  * @param  Address: Variable virtual address
-  * @retval Data for variable or EEPROM_DEFAULT_DATA, if any errors
-  */
-/*
-uint16_t EEPROM_read (uint16_t Address)
-{
-    uint16_t data;
-    EEPROM_read(Address, &data);
-    return data;
-}*/
-
-/**
-  * @brief  Returns the last stored variable data, if found,
-  *         which correspond to the passed virtual address
-  * @param  Address: Variable virtual address
-  * @param  Data: Pointer to data variable
-  * @retval Success or error status:
-  *           - EEPROM_OK: if variable was found
-  *           - EEPROM_BAD_ADDRESS: if the variable was not found
-  *           - EEPROM_NO_VALID_PAGE: if no valid page was found.
-  */
-uint16_t EEPROM_read(uint16_t Address, uint16_t *Data)
-{
-    uint32_t pageBase, pageEnd;
-
-    // Set default data (empty EEPROM)
-    *Data = EEPROM_DEFAULT_DATA;
-
-    if (Status == EEPROM_NOT_INIT)
-        if (EEPROM_init() != EEPROM_OK)
-            return Status;
-
-    // Get active Page for read operation
-    pageBase = EE_FindValidPage();
-    if (pageBase == 0)
-        return  EEPROM_NO_VALID_PAGE;
-
-    // Get the valid Page end Address
-    pageEnd = pageBase + ((uint32_t)(PageSize - 2));
-
-    // Check each active page address starting from end
-    for (pageBase += 6; pageEnd >= pageBase; pageEnd -= 4)
-        if ((*(__IO uint16_t*)pageEnd) == Address)      // Compare the read address with the virtual address
-        {
-            *Data = (*(__IO uint16_t*)(pageEnd - 2));       // Get content of Address-2 which is variable value
-            return EEPROM_OK;
-        }
-
-    // Return ReadStatus value: (0: variable exist, 1: variable doesn't exist)
-    return EEPROM_BAD_ADDRESS;
-}
-
-/**
-  * @brief  Writes/upadtes variable data in EEPROM.
-  * @param  VirtAddress: Variable virtual address
-  * @param  Data: 16 bit data to be written
-  * @retval Success or error status:
-  *         - FLASH_COMPLETE: on success
-  *         - EEPROM_BAD_ADDRESS: if address = 0xFFFF
-  *         - EEPROM_PAGE_FULL: if valid page is full
-  *         - EEPROM_NO_VALID_PAGE: if no valid page was found
-  *         - EEPROM_OUT_SIZE: if no empty EEPROM variables
-  *         - Flash error code: on write Flash error
-  */
-uint16_t EEPROM_write(uint16_t Address, uint16_t Data)
-{
-    if (Status == EEPROM_NOT_INIT)
-        if (EEPROM_init() != EEPROM_OK)
-            return Status;
-
-    if (Address == 0xFFFF)
-        return EEPROM_BAD_ADDRESS;
-
-    // Write the variable virtual address and value in the EEPROM
-    uint16_t status = EE_VerifyPageFullWriteVariable(Address, Data);
-    return status;
-}
-
-/**
-  * @brief  Writes/upadtes variable data in EEPROM.
-            The value is written only if differs from the one already saved at the same address.
-  * @param  VirtAddress: Variable virtual address
-  * @param  Data: 16 bit data to be written
-  * @retval Success or error status:
-  *         - EEPROM_SAME_VALUE: If new Data matches existing EEPROM Data
-  *         - FLASH_COMPLETE: on success
-  *         - EEPROM_BAD_ADDRESS: if address = 0xFFFF
-  *         - EEPROM_PAGE_FULL: if valid page is full
-  *         - EEPROM_NO_VALID_PAGE: if no valid page was found
-  *         - EEPROM_OUT_SIZE: if no empty EEPROM variables
-  *         - Flash error code: on write Flash error
-  */
-uint16_t EEPROM_update(uint16_t Address, uint16_t Data)
-{
-    uint16_t temp;
-    EEPROM_read(Address, &temp);
-    if (temp == Data)
-        return EEPROM_SAME_VALUE;
-    else
-        return EEPROM_write(Address, Data);
+    return FlashStatus;
 }
+/*****************************************************************************
+*  Read once data byte from a specified address.
+*******************************************************************************/
+uint8_t EEPROM_ReadDataByte (uint16_t Address) {
 
-/**
-  * @brief  Return number of variable
-  * @retval Number of variables
-  */
-uint16_t EEPROM_count(uint16_t *Count)
-{
-    if (Status == EEPROM_NOT_INIT)
-        if (EEPROM_init() != EEPROM_OK)
-            return Status;
-
-    // Get valid Page for write operation
-    uint32_t pageBase = EE_FindValidPage();
-    if (pageBase == 0)
-        return EEPROM_NO_VALID_PAGE;    // No valid page, return max. numbers
+    uint8_t DataByte = 0xFF;
 
-    *Count = EE_GetVariablesCount(pageBase, 0xFFFF);
-    return EEPROM_OK;
-}
+    // Get Byte from specified address
+    DataByte = (*(__IO uint8_t*)(FEE_PAGE_BASE_ADDRESS + FEE_ADDR_OFFSET(Address)));
 
-uint16_t EEPROM_maxcount(void)
-{
-    return ((PageSize / 4)-1);
+    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;
-    uint16_t temp;
-    EEPROM_read(p, &temp);
-    return (uint8_t) temp;
+    return EEPROM_ReadDataByte(p);
 }
 
 void eeprom_write_byte (uint8_t *Address, uint8_t Value)
 {
     uint16_t p = (uint32_t) Address;
-    EEPROM_write(p, (uint16_t) Value);
+    EEPROM_WriteDataByte(p, Value);
 }
 
 void eeprom_update_byte (uint8_t *Address, uint8_t Value)
 {
     uint16_t p = (uint32_t) Address;
-    EEPROM_update(p, (uint16_t) Value);
+    EEPROM_WriteDataByte(p, Value);
 }
 
 uint16_t eeprom_read_word (const uint16_t *Address)
 {
     const uint16_t p = (const uint32_t) Address;
-    uint16_t temp;
-    EEPROM_read(p, &temp);
-    return temp;
+    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_write(p, Value);
+    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_update(p, Value);
+    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;
-    uint16_t temp1, temp2;
-    EEPROM_read(p, &temp1);
-    EEPROM_read(p + 1, &temp2);
-    return temp1 | (temp2 << 16);
+    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 temp = (uint16_t) Value;
-    uint16_t p = (uint32_t) Address;
-    EEPROM_write(p, temp);
-    temp = (uint16_t) (Value >> 16);
-    EEPROM_write(p + 1, temp);
+    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 temp = (uint16_t) Value;
-    uint16_t p = (uint32_t) Address;
-    EEPROM_update(p, temp);
-    temp = (uint16_t) (Value >> 16);
-    EEPROM_update(p + 1, temp);
+    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_read_block(void *buf, const void *addr, uint32_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, uint32_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, uint32_t len) {
+    uint8_t *p = (uint8_t *)addr;
+    const uint8_t *src = (const uint8_t *)buf;
+    while (len--) {
+        eeprom_write_byte(p++, *src++);
+    }
 }
diff --git a/tmk_core/common/chibios/eeprom_stm32.h b/tmk_core/common/chibios/eeprom_stm32.h
index 09229530ca..892e417b7e 100755
--- a/tmk_core/common/chibios/eeprom_stm32.h
+++ b/tmk_core/common/chibios/eeprom_stm32.h
@@ -10,15 +10,17 @@
  * 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 https://github.com/rogerclarkmelbourne/Arduino_STM32 and
- * https://github.com/leaflabs/libmaple
+ * 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.
  */
 
-// This file must be modified if the MCU is not defined below.
-// This library also assumes that the pages are not used by the firmware.
-
 #ifndef __EEPROM_H
 #define __EEPROM_H
 
@@ -38,9 +40,11 @@
 
 #ifndef EEPROM_PAGE_SIZE
     #if defined (MCU_STM32F103RB)
-        #define EEPROM_PAGE_SIZE    (uint16_t)0x400  /* Page size = 1KByte */
+        #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 EEPROM_PAGE_SIZE    (uint16_t)0x800  /* Page size = 2KByte */
+        #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
@@ -48,48 +52,30 @@
 
 #ifndef EEPROM_START_ADDRESS
     #if defined (MCU_STM32F103RB)
-        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 128 * 1024 - 2 * EEPROM_PAGE_SIZE))
+        #define FEE_MCU_FLASH_SIZE  128     // Size in Kb
     #elif defined (MCU_STM32F103ZE) || defined (MCU_STM32F103RE)
-        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 512 * 1024 - 2 * EEPROM_PAGE_SIZE))
+        #define FEE_MCU_FLASH_SIZE  512     // Size in Kb
     #elif defined (MCU_STM32F103RD)
-        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 384 * 1024 - 2 * EEPROM_PAGE_SIZE))
+        #define FEE_MCU_FLASH_SIZE  384     // Size in Kb
     #elif defined (MCU_STM32F303CC)
-        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 256 * 1024 - 2 * EEPROM_PAGE_SIZE))
+        #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
 
-/* Pages 0 and 1 base and end addresses */
-#define EEPROM_PAGE0_BASE       ((uint32_t)(EEPROM_START_ADDRESS + 0x000))
-#define EEPROM_PAGE1_BASE       ((uint32_t)(EEPROM_START_ADDRESS + EEPROM_PAGE_SIZE))
-
-/* Page status definitions */
-#define EEPROM_ERASED           ((uint16_t)0xFFFF)  /* PAGE is empty */
-#define EEPROM_RECEIVE_DATA     ((uint16_t)0xEEEE)  /* PAGE is marked to receive data */
-#define EEPROM_VALID_PAGE       ((uint16_t)0x0000)  /* PAGE containing valid data */
-
-/* Page full define */
-enum uint16_t
-    {
-    EEPROM_OK               = ((uint16_t)0x0000),
-    EEPROM_OUT_SIZE         = ((uint16_t)0x0081),
-    EEPROM_BAD_ADDRESS      = ((uint16_t)0x0082),
-    EEPROM_BAD_FLASH        = ((uint16_t)0x0083),
-    EEPROM_NOT_INIT         = ((uint16_t)0x0084),
-    EEPROM_SAME_VALUE       = ((uint16_t)0x0085),
-    EEPROM_NO_VALID_PAGE    = ((uint16_t)0x00AB)
-    };
-
-#define EEPROM_DEFAULT_DATA     0xFFFF
+// 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
 
-    uint16_t EEPROM_init(void);
-    uint16_t EEPROM_format(void);
-    uint16_t EEPROM_erases(uint16_t *);
-    uint16_t EEPROM_read (uint16_t address, uint16_t *data);
-    uint16_t EEPROM_write(uint16_t address, uint16_t data);
-    uint16_t EEPROM_update(uint16_t address, uint16_t data);
-    uint16_t EEPROM_count(uint16_t *);
-    uint16_t EEPROM_maxcount(void);
+// 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 */
diff --git a/tmk_core/common/chibios/flash_stm32.c b/tmk_core/common/chibios/flash_stm32.c
index 2735934844..164654a15e 100755
--- a/tmk_core/common/chibios/flash_stm32.c
+++ b/tmk_core/common/chibios/flash_stm32.c
@@ -186,3 +186,18 @@ void FLASH_Lock(void)
     /* Set the Lock Bit to lock the FPEC and the FCR */
     FLASH->CR |= FLASH_CR_LOCK;
 }
+
+/**
+  * @brief  Clears the FLASH's pending flags.
+  * @param  FLASH_FLAG: specifies the FLASH flags to clear.
+  *   This parameter can be any combination of the following values:
+  *     @arg FLASH_FLAG_PGERR: FLASH Programming error flag flag
+  *     @arg FLASH_FLAG_WRPERR: FLASH Write protected error flag
+  *     @arg FLASH_FLAG_EOP: FLASH End of Programming flag                
+  * @retval None