Konstantin Bulanov / eeprom_STMF103

EEPROM emulation using Flash for STM32F103 with fix error on "FLASH_PageErase"

Fork of eeprom_flash by Chau Vo

eeprom_flash.cpp@2:16f5373f8b31, 2018-05-05 (annotated)

Committer:
Leech
Date:
Sat May 05 19:06:35 2018 +0000
Revision:
2:16f5373f8b31
Parent:
0:ea2bec485611 
Fix error on FLASH_PageErase

Who changed what in which revision?

UserRevisionLine numberNew contents of line
olympux 0:ea2bec485611 1 #include "mbed.h"
olympux 0:ea2bec485611 2 #include "eeprom_flash.h"
olympux 0:ea2bec485611 3
olympux 0:ea2bec485611 4 /*
olympux 0:ea2bec485611 5 * Debug option
olympux 0:ea2bec485611 6 */
olympux 0:ea2bec485611 7 #if 0
olympux 0:ea2bec485611 8 //Enable debug
olympux 0:ea2bec485611 9 #include <cstdio>
olympux 0:ea2bec485611 10 #define DBG(x, ...) std::printf("[eeprom: DBG]"x"\r\n", ##__VA_ARGS__);
olympux 0:ea2bec485611 11 #define WARN(x, ...) std::printf("[eeprom: WARN]"x"\r\n", ##__VA_ARGS__);
olympux 0:ea2bec485611 12 #define ERR(x, ...) std::printf("[eeprom: ERR]"x"\r\n", ##__VA_ARGS__);
olympux 0:ea2bec485611 13 #else
olympux 0:ea2bec485611 14 //Disable debug
olympux 0:ea2bec485611 15 #define DBG(x, ...)
olympux 0:ea2bec485611 16 #define WARN(x, ...)
olympux 0:ea2bec485611 17 #define ERR(x, ...)
olympux 0:ea2bec485611 18 #endif
olympux 0:ea2bec485611 19
olympux 0:ea2bec485611 20 /*
olympux 0:ea2bec485611 21 * Must call this first to enable writing
olympux 0:ea2bec485611 22 */
olympux 0:ea2bec485611 23 void enableEEPROMWriting() {
olympux 0:ea2bec485611 24 HAL_StatusTypeDef status = HAL_FLASH_Unlock();
olympux 0:ea2bec485611 25 FLASH_PageErase(EEPROM_START_ADDRESS); // required to re-write
olympux 0:ea2bec485611 26 CLEAR_BIT(FLASH->CR, FLASH_CR_PER); // Bug fix: bit PER has been set in Flash_PageErase(), must clear it here
olympux 0:ea2bec485611 27 }
olympux 0:ea2bec485611 28
Leech 2:16f5373f8b31 29 void FLASH_PageErase(uint32_t PageAddress)
Leech 2:16f5373f8b31 30 {
Leech 2:16f5373f8b31 31 /* Proceed to erase the page */
Leech 2:16f5373f8b31 32 SET_BIT(FLASH->CR, FLASH_CR_PER);
Leech 2:16f5373f8b31 33 while (FLASH->SR & FLASH_SR_BSY);
Leech 2:16f5373f8b31 34 WRITE_REG(FLASH->AR, PageAddress);
Leech 2:16f5373f8b31 35 SET_BIT(FLASH->CR, FLASH_CR_STRT);
Leech 2:16f5373f8b31 36 while (FLASH->SR & FLASH_SR_BSY);
Leech 2:16f5373f8b31 37 CLEAR_BIT(FLASH->CR, FLASH_CR_PER);
Leech 2:16f5373f8b31 38 }
Leech 2:16f5373f8b31 39
olympux 0:ea2bec485611 40 void disableEEPROMWriting() {
olympux 0:ea2bec485611 41 HAL_FLASH_Lock();
olympux 0:ea2bec485611 42 }
olympux 0:ea2bec485611 43
olympux 0:ea2bec485611 44 /*
olympux 0:ea2bec485611 45 * Writing functions
olympux 0:ea2bec485611 46 * Must call enableEEPROMWriting() first
olympux 0:ea2bec485611 47 */
olympux 0:ea2bec485611 48 HAL_StatusTypeDef writeEEPROMHalfWord(uint32_t address, uint16_t data) {
olympux 0:ea2bec485611 49 HAL_StatusTypeDef status;
olympux 0:ea2bec485611 50 address = address + EEPROM_START_ADDRESS;
olympux 0:ea2bec485611 51
olympux 0:ea2bec485611 52 status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, address, data);
olympux 0:ea2bec485611 53
olympux 0:ea2bec485611 54 return status;
olympux 0:ea2bec485611 55 }
olympux 0:ea2bec485611 56
olympux 0:ea2bec485611 57 HAL_StatusTypeDef writeEEPROMWord(uint32_t address, uint32_t data) {
olympux 0:ea2bec485611 58 HAL_StatusTypeDef status;
olympux 0:ea2bec485611 59 address = address + EEPROM_START_ADDRESS;
olympux 0:ea2bec485611 60
olympux 0:ea2bec485611 61 status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, data);
olympux 0:ea2bec485611 62
olympux 0:ea2bec485611 63 return status;
olympux 0:ea2bec485611 64 }
olympux 0:ea2bec485611 65
olympux 0:ea2bec485611 66 /*
olympux 0:ea2bec485611 67 * Reading functions
olympux 0:ea2bec485611 68 */
olympux 0:ea2bec485611 69 uint16_t readEEPROMHalfWord(uint32_t address) {
olympux 0:ea2bec485611 70 uint16_t val = 0;
olympux 0:ea2bec485611 71 address = address + EEPROM_START_ADDRESS;
olympux 0:ea2bec485611 72 val = *(__IO uint16_t*)address;
olympux 0:ea2bec485611 73
olympux 0:ea2bec485611 74 return val;
olympux 0:ea2bec485611 75 }
olympux 0:ea2bec485611 76
olympux 0:ea2bec485611 77 uint32_t readEEPROMWord(uint32_t address) {
olympux 0:ea2bec485611 78 uint32_t val = 0;
olympux 0:ea2bec485611 79 address = address + EEPROM_START_ADDRESS;
olympux 0:ea2bec485611 80 val = *(__IO uint32_t*)address;
olympux 0:ea2bec485611 81
olympux 0:ea2bec485611 82 return val;
olympux 0:ea2bec485611 83 }