89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
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* eeprom.h
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*
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* Created on: Dec 7, 2025
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* Author: user
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*/
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#ifndef __EEPROM_H
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#define __EEPROM_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "stm32f1xx_hal.h"
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/*
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* Simple EEPROM emulation for STM32F103C8T6 (medium density).
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* - Uses 2 Flash pages (1 kB each) at the end of Flash.
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* - Stores variables as 16-bit values identified by 16-bit "virtual addresses".
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*
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* You must define the list of virtual addresses in eeprom.c: EE_VirtAddrs[].
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*/
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typedef enum
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{
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EE_OK = 0,
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EE_ERROR,
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EE_NOT_FOUND,
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EE_NO_SPACE
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} EE_Status;
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/* Flash parameters for STM32F103C8T6 */
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#define EE_FLASH_BASE_ADDR 0x08000000U
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#define EE_PAGE_SIZE 0x400U /* 1 kB pages */
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/*
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* Here we assume a 64 kB Flash device (STM32F103C8T6):
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* Flash range: 0x0800 0000 - 0x0800 FFFF
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* Pages: 0..63 (64 pages)
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* We use the last 2 pages for EEPROM:
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* - Page 62: 0x0800 F800
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* - Page 63: 0x0800 FC00
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*/
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#define EE_PAGE0_BASE (EE_FLASH_BASE_ADDR + (62U * EE_PAGE_SIZE))
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#define EE_PAGE1_BASE (EE_FLASH_BASE_ADDR + (63U * EE_PAGE_SIZE))
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/* Page status markers (stored in the first halfword of each page) */
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#define EE_PAGE_STATUS_ERASED 0xFFFFU
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#define EE_PAGE_STATUS_VALID 0xAAAAU
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#define EE_PAGE_STATUS_RECEIVE 0x5555U
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/*
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* Configure how many virtual variables you have.
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* Example: bytes, words, and array elements mapped to 16-bit variables.
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* Set EE_NUM_VIRTUAL_ADDR and define EE_VirtAddrs[] in eeprom.c.
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*/
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/* 32 virtual variables, sequential addresses */
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#define EE_NUM_VIRTUAL_ADDR 32U
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#define EEW_ADDR(i) (uint16_t)(0x0001 + (i)) // i = 0..31
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/* Virtual address table (defined in eeprom.c, can be customized) */
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extern const uint16_t EE_VirtAddrs[EE_NUM_VIRTUAL_ADDR];
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/* Public API */
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EE_Status EE_Init(void);
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EE_Status EE_ReadVariable(uint16_t VirtAddress, uint16_t *Data);
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EE_Status EE_WriteVariable(uint16_t VirtAddress, uint16_t Data);
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/* Pseudo-array accessor */
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static inline EE_Status EEW_Read(uint8_t idx, uint16_t *value)
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{
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return EE_ReadVariable(EEW_ADDR(idx), value);
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}
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static inline EE_Status EEW_Write(uint8_t idx, uint16_t value)
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{
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return EE_WriteVariable(EEW_ADDR(idx), value);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* __EEPROM_H */
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