STM32F4 FLASH update

Add critical section in flash_erase_sector

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32F4/flash_api.c

@@ -21,9 +21,6 @@
 #include "flash_data.h"
 #include "platform/mbed_critical.h"
 
-// This file is automatically generated
-
-
 static uint32_t GetSector(uint32_t Address);
 static uint32_t GetSectorSize(uint32_t Sector);
 
@@ -37,30 +34,8 @@ int32_t flash_free(flash_t *obj)
     return 0;
 }
 
-static int32_t flash_unlock(void)
-{
-    /* Allow Access to Flash control registers and user Falsh */
-    if (HAL_FLASH_Unlock()) {
-        return -1;
-    } else {
-        return 0;
-    }
-}
-
-static int32_t flash_lock(void)
-{
-    /* Disable the Flash option control register access (recommended to protect
-    the option Bytes against possible unwanted operations) */
-    if (HAL_FLASH_Lock()) {
-        return -1;
-    } else {
-        return 0;
-    }
-}
-
 int32_t flash_erase_sector(flash_t *obj, uint32_t address)
 {
-    /*Variable used for Erase procedure*/
     static FLASH_EraseInitTypeDef EraseInitStruct;
     uint32_t FirstSector;
     uint32_t SectorError = 0;
@@ -70,10 +45,12 @@ int32_t flash_erase_sector(flash_t *obj, uint32_t address)
         return -1;
     }
 
-    if (flash_unlock() != HAL_OK) {
+    if (HAL_FLASH_Unlock() != HAL_OK) {
         return -1;
     }
 
+    core_util_critical_section_enter();
+
     /* Get the 1st sector to erase */
     FirstSector = GetSector(address);
 
@@ -86,7 +63,9 @@ int32_t flash_erase_sector(flash_t *obj, uint32_t address)
         status = -1;
     }
 
-    flash_lock();
+    HAL_FLASH_Lock();
+
+    core_util_critical_section_exit();
 
     return status;
 }
@@ -99,7 +78,7 @@ int32_t flash_program_page(flash_t *obj, uint32_t address, const uint8_t *data,
         return -1;
     }
 
-    if (flash_unlock() != HAL_OK) {
+    if (HAL_FLASH_Unlock() != HAL_OK) {
         return -1;
     }
 
@@ -126,7 +105,7 @@ int32_t flash_program_page(flash_t *obj, uint32_t address, const uint8_t *data,
         }
     }
 
-    flash_lock();
+    HAL_FLASH_Lock();
 
     return status;
 }