eeprom_flash.cpp

00001 #include "mbed.h"
00002 #include "eeprom_flash.h"
00003 
00004 /*
00005  * Debug option
00006  */
00007 #if 0
00008 //Enable debug
00009 #include <cstdio>
00010 #define DBG(x, ...) std::printf("[eeprom: DBG]"x"\r\n", ##__VA_ARGS__); 
00011 #define WARN(x, ...) std::printf("[eeprom: WARN]"x"\r\n", ##__VA_ARGS__); 
00012 #define ERR(x, ...) std::printf("[eeprom: ERR]"x"\r\n", ##__VA_ARGS__); 
00013 #else
00014 //Disable debug
00015 #define DBG(x, ...) 
00016 #define WARN(x, ...)
00017 #define ERR(x, ...) 
00018 #endif
00019 
00020 /*
00021  * Must call this first to enable writing
00022  */
00023 void enableEEPROMWriting() {
00024     HAL_StatusTypeDef status = HAL_FLASH_Unlock();
00025     FLASH_PageErase(EEPROM_START_ADDRESS); // required to re-write
00026     CLEAR_BIT(FLASH->CR, FLASH_CR_PER); // Bug fix: bit PER has been set in Flash_PageErase(), must clear it here
00027 }
00028 
00029 void disableEEPROMWriting() {
00030     HAL_FLASH_Lock();
00031 }
00032 
00033 /*
00034  * Writing functions
00035  * Must call enableEEPROMWriting() first
00036  */
00037 HAL_StatusTypeDef writeEEPROMHalfWord(uint32_t address, uint16_t data) {
00038     HAL_StatusTypeDef status;
00039     address = address + EEPROM_START_ADDRESS;
00040     
00041     status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, address, data);
00042     
00043     return status;
00044 }
00045 
00046 HAL_StatusTypeDef writeEEPROMWord(uint32_t address, uint32_t data) {
00047     HAL_StatusTypeDef status;
00048     address = address + EEPROM_START_ADDRESS;
00049     
00050     status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, data);
00051 
00052     return status;
00053 }
00054 
00055 /*
00056  * Reading functions
00057  */
00058 uint16_t readEEPROMHalfWord(uint32_t address) {
00059     uint16_t val = 0;
00060     address = address + EEPROM_START_ADDRESS;
00061     val = *(__IO uint16_t*)address;
00062     
00063     return val;
00064 }
00065 
00066 uint32_t readEEPROMWord(uint32_t address) {
00067     uint32_t val = 0;
00068     address = address + EEPROM_START_ADDRESS;
00069     val = *(__IO uint32_t*)address;
00070     
00071     return val;
00072 }