Revision 0:ea2bec485611, committed 2016-08-13

Comitter:

olympux

Date:

Sat Aug 13 22:44:48 2016 +0000

Child:

1:e593ae8ff81d

Commit message:

Initial with bug fix on keeping PER cleared after erasing page

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/eeprom_flash.cpp	Sat Aug 13 22:44:48 2016 +0000
@@ -0,0 +1,72 @@
+#include "mbed.h"
+#include "eeprom_flash.h"
+
+/*
+ * Debug option
+ */
+#if 0
+//Enable debug
+#include <cstdio>
+#define DBG(x, ...) std::printf("[eeprom: DBG]"x"\r\n", ##__VA_ARGS__); 
+#define WARN(x, ...) std::printf("[eeprom: WARN]"x"\r\n", ##__VA_ARGS__); 
+#define ERR(x, ...) std::printf("[eeprom: ERR]"x"\r\n", ##__VA_ARGS__); 
+#else
+//Disable debug
+#define DBG(x, ...) 
+#define WARN(x, ...)
+#define ERR(x, ...) 
+#endif
+
+/*
+ * Must call this first to enable writing
+ */
+void enableEEPROMWriting() {
+    HAL_StatusTypeDef status = HAL_FLASH_Unlock();
+    FLASH_PageErase(EEPROM_START_ADDRESS); // required to re-write
+    CLEAR_BIT(FLASH->CR, FLASH_CR_PER); // Bug fix: bit PER has been set in Flash_PageErase(), must clear it here
+}
+
+void disableEEPROMWriting() {
+    HAL_FLASH_Lock();
+}
+
+/*
+ * Writing functions
+ * Must call enableEEPROMWriting() first
+ */
+HAL_StatusTypeDef writeEEPROMHalfWord(uint32_t address, uint16_t data) {
+    HAL_StatusTypeDef status;
+    address = address + EEPROM_START_ADDRESS;
+    
+    status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, address, data);
+    
+    return status;
+}
+
+HAL_StatusTypeDef writeEEPROMWord(uint32_t address, uint32_t data) {
+    HAL_StatusTypeDef status;
+    address = address + EEPROM_START_ADDRESS;
+    
+    status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, data);
+
+    return status;
+}
+
+/*
+ * Reading functions
+ */
+uint16_t readEEPROMHalfWord(uint32_t address) {
+    uint16_t val = 0;
+    address = address + EEPROM_START_ADDRESS;
+    val = *(__IO uint16_t*)address;
+    
+    return val;
+}
+
+uint32_t readEEPROMWord(uint32_t address) {
+    uint32_t val = 0;
+    address = address + EEPROM_START_ADDRESS;
+    val = *(__IO uint32_t*)address;
+    
+    return val;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/eeprom_flash.h	Sat Aug 13 22:44:48 2016 +0000
@@ -0,0 +1,19 @@
+#ifndef __EEPROM_FLASH_H
+#define __EEPROM_FLASH_H
+
+#include "mbed.h"
+
+#define EEPROM_START_ADDRESS   ((uint32_t)0x08019000) // EEPROM emulation start address: after 100KByte of used Flash memory
+
+void enableEEPROMWriting(); // Unlock and keep PER cleared
+void disableEEPROMWriting(); // Lock
+
+// Write functions
+HAL_StatusTypeDef writeEEPROMHalfWord(uint32_t address, uint16_t data);
+HAL_StatusTypeDef writeEEPROMWord(uint32_t address, uint32_t data);
+
+// Read functions
+uint16_t readEEPROMHalfWord(uint32_t address);
+uint32_t readEEPROMWord(uint32_t address);
+
+#endif
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