88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
#include "Int_EEPROM24xx.h"
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static IntEEPROM24xx_Config_t g_cfg;
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static IntEEPROM_I2CRead_t g_read_fn;
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static IntEEPROM_I2CWrite_t g_write_fn;
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static IntEEPROM_DelayMs_t g_delay_fn;
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static uint8_t g_inited;
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IntEEPROM_Result_t Int_EEPROM24xx_Init(const IntEEPROM24xx_Config_t *cfg,
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IntEEPROM_I2CRead_t read_fn,
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IntEEPROM_I2CWrite_t write_fn,
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IntEEPROM_DelayMs_t delay_fn)
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{
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if (cfg == NULL || read_fn == 0 || write_fn == 0)
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{
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return INT_EEPROM_ERR_ARG;
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}
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if (cfg->page_size == 0u || (cfg->mem_addr_size != 1u && cfg->mem_addr_size != 2u))
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{
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return INT_EEPROM_ERR_ARG;
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}
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g_cfg = *cfg;
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g_read_fn = read_fn;
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g_write_fn = write_fn;
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g_delay_fn = delay_fn;
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g_inited = 1u;
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return INT_EEPROM_OK;
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}
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/* 直接透传到用户提供的总线读回调。 */
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IntEEPROM_Result_t Int_EEPROM24xx_Read(uint32_t mem_addr, uint8_t *buf, uint16_t len)
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{
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if (g_inited == 0u || buf == 0 || len == 0u)
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{
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return INT_EEPROM_ERR_ARG;
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}
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return g_read_fn(g_cfg.dev_addr, mem_addr, g_cfg.mem_addr_size, buf, len, g_cfg.timeout_ms);
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}
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/* 按页拆分写入，避免跨页写导致 EEPROM 数据回卷或写失败。 */
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IntEEPROM_Result_t Int_EEPROM24xx_Write(uint32_t mem_addr, const uint8_t *buf, uint16_t len)
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{
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uint16_t written = 0;
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uint16_t chunk;
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uint32_t cur_addr;
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uint16_t page_off;
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uint16_t room;
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IntEEPROM_Result_t st;
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if (g_inited == 0u || buf == 0 || len == 0u)
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{
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return INT_EEPROM_ERR_ARG;
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}
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while (written < len)
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{
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/* 计算当前页内偏移和本次最多可写长度。 */
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cur_addr = mem_addr + written;
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page_off = (uint16_t)(cur_addr % g_cfg.page_size);
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room = (uint16_t)(g_cfg.page_size - page_off);
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chunk = (uint16_t)(((len - written) < room) ? (len - written) : room);
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/* 实际总线写由平台适配层完成。 */
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st = g_write_fn(g_cfg.dev_addr,
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cur_addr,
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g_cfg.mem_addr_size,
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(const uint8_t *)(buf + written),
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chunk,
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g_cfg.timeout_ms);
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if (st != INT_EEPROM_OK)
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{
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return st;
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}
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if (g_delay_fn != 0 && g_cfg.write_cycle_ms > 0u)
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{
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/* EEPROM 页写后通常需要写周期时间。 */
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g_delay_fn(g_cfg.write_cycle_ms);
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}
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written = (uint16_t)(written + chunk);
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}
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return INT_EEPROM_OK;
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}
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