Nothing Special / Mbed 2 deprecated 00_eeprom_emulation_f091

simple test EEPROM emulation (STM algorithm described in the application notes: AN4061, AN3969, AN2594, AN3390, AN4056) for STM32F091

Dependencies:   mbed

Description in AN4061 from STM.

Changed (compared with the original code AN4061):

  • possibility of a larger size of emulated EEPROM (using multiple Flash pages)
  • dummy variables prevent overwrite code in Flash by algorithm of EEPROM emulation




Macro PAGE_NB_PVP (in eeprom.h) defines the size of the virtual page.
Eg. For F091 where Flash page are 2kB value 4 gives 8kB.

Size 8kB virtual page gives you the ability to use max. approx. 2k of 16-bit variables.

Diff: eeprom/eeprom.cpp

Revision:
6:669ff12928f9
Parent:
5:aa44afa6ca35
--- a/eeprom/eeprom.cpp	Fri Sep 23 17:44:45 2016 +0000
+++ b/eeprom/eeprom.cpp	Fri Sep 23 23:58:25 2016 +0000
@@ -92,7 +92,7 @@
   /* Fill EraseInit structure*/
   s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
   s_eraseinit.PageAddress = PAGE0_BASE_ADDRESS;
-  s_eraseinit.NbPages     = 1;
+  s_eraseinit.NbPages     = PAGE_NB_PVP;
   
   /* Check for invalid header states and repair if necessary */
   switch (pagestatus0)
@@ -179,7 +179,7 @@
         }
         s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
         s_eraseinit.PageAddress = PAGE1_BASE_ADDRESS;
-        s_eraseinit.NbPages     = 1;
+        s_eraseinit.NbPages     = PAGE_NB_PVP;
         /* Erase Page1 */
         if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
         { 
@@ -195,7 +195,7 @@
       {
         s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
         s_eraseinit.PageAddress = PAGE1_BASE_ADDRESS;
-        s_eraseinit.NbPages     = 1;
+        s_eraseinit.NbPages     = PAGE_NB_PVP;
         /* Erase Page1 */
         if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
         { 
@@ -241,7 +241,7 @@
       {
         s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
         s_eraseinit.PageAddress = PAGE1_BASE_ADDRESS;
-        s_eraseinit.NbPages     = 1;
+        s_eraseinit.NbPages     = PAGE_NB_PVP;
         /* Erase Page1 */
         if(!EE_VerifyPageFullyErased(PAGE1_BASE_ADDRESS))
         { 
@@ -288,7 +288,7 @@
         }
         s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
         s_eraseinit.PageAddress = PAGE0_BASE_ADDRESS;
-        s_eraseinit.NbPages     = 1;
+        s_eraseinit.NbPages     = PAGE_NB_PVP;
         /* Erase Page0 */
         if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
         { 
@@ -466,7 +466,7 @@
 
   s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
   s_eraseinit.PageAddress = PAGE0_BASE_ADDRESS;
-  s_eraseinit.NbPages     = 1;
+  s_eraseinit.NbPages     = PAGE_NB_PVP;
   /* Erase Page0 */
   if(!EE_VerifyPageFullyErased(PAGE0_BASE_ADDRESS))
   {
@@ -715,7 +715,7 @@
 
   s_eraseinit.TypeErase   = FLASH_TYPEERASE_PAGES;
   s_eraseinit.PageAddress = oldpageid;
-  s_eraseinit.NbPages     = 1;
+  s_eraseinit.NbPages     = PAGE_NB_PVP;
   
   /* Erase the old Page: Set old Page status to ERASED status */
   flashstatus = HAL_FLASHEx_Erase(&s_eraseinit, &page_error);