382 lines
10 KiB
C
382 lines
10 KiB
C
/*
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* 模块名称：SD2506API-G RTC 实时时钟驱动
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* 模块功能：SD2506API-G 高精度温补实时时钟模块 I2C 驱动
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* 适用平台：STM32F407ZGT6，I2C1 接口 (PB6-SCL, PB7-SDA)
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* 作者：王建锋
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* 创建日期：2026-07-17
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* 修改记录：
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* 2026-07-17 王建锋 创建初始版本，参考 SD2506API-G Ver2.0 手册
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*/
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#include "sd2506.h"
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#include "i2c.h"
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#include <string.h>
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extern I2C_HandleTypeDef hi2c1;
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/* ======================== 内部辅助函数 ======================== */
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uint8_t sd2506_bcd_to_dec(uint8_t bcd)
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{
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return ((bcd >> 4) * 10) + (bcd & 0x0FU);
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}
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uint8_t sd2506_dec_to_bcd(uint8_t dec)
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{
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return ((dec / 10) << 4) | (dec % 10);
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}
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/*
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* 写单字节寄存器
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* reg: 寄存器地址 (00H~79H)
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* val: 写入值
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* 返回: 0=成功, -2=I2C错误
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*/
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static int sd2506_write_reg(uint8_t reg, uint8_t val)
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{
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if (HAL_I2C_Mem_Write(&hi2c1, SD2506_I2C_ADDR_WRITE, reg,
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I2C_MEMADD_SIZE_8BIT, &val, 1,
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SD2506_I2C_TIMEOUT_MS) != HAL_OK) {
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return SD2506_I2C_ERROR;
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}
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return SD2506_OK;
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}
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/*
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* 读单字节寄存器
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* reg: 寄存器地址 (00H~79H)
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* val: 读取值指针
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* 返回: 0=成功, -2=I2C错误
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*/
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static int sd2506_read_reg(uint8_t reg, uint8_t *val)
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{
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if (HAL_I2C_Mem_Read(&hi2c1, SD2506_I2C_ADDR_READ, reg,
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I2C_MEMADD_SIZE_8BIT, val, 1,
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SD2506_I2C_TIMEOUT_MS) != HAL_OK) {
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return SD2506_I2C_ERROR;
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}
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return SD2506_OK;
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}
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/*
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* 写多字节寄存器 (从 reg 开始连续写入 len 字节)
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* reg: 起始寄存器地址
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* data: 数据缓冲区
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* len: 数据长度
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* 返回: 0=成功, -2=I2C错误
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*/
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static int sd2506_write_regs(uint8_t reg, const uint8_t *data, uint8_t len)
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{
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if (HAL_I2C_Mem_Write(&hi2c1, SD2506_I2C_ADDR_WRITE, reg,
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I2C_MEMADD_SIZE_8BIT, (uint8_t *)data, len,
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SD2506_I2C_TIMEOUT_MS) != HAL_OK) {
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return SD2506_I2C_ERROR;
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}
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return SD2506_OK;
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}
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/*
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* 读多字节寄存器 (从 reg 开始连续读取 len 字节)
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* reg: 起始寄存器地址
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* data: 数据缓冲区
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* len: 数据长度
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* 返回: 0=成功, -2=I2C错误
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*/
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static int sd2506_read_regs(uint8_t reg, uint8_t *data, uint8_t len)
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{
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if (HAL_I2C_Mem_Read(&hi2c1, SD2506_I2C_ADDR_READ, reg,
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I2C_MEMADD_SIZE_8BIT, data, len,
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SD2506_I2C_TIMEOUT_MS) != HAL_OK) {
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return SD2506_I2C_ERROR;
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}
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return SD2506_OK;
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}
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/*
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* 开启写保护 (允许写入 00H~71H 寄存器)
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* 顺序: 先写 WRTC1=1, 再写 WRTC2=1 + WRTC3=1
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*/
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static int sd2506_write_enable(void)
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{
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int ret;
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/* 先置 WRTC1=1 (bit6=1), 其它位参考手册: 0x84 */
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ret = sd2506_write_reg(SD2506_REG_CTR1, 0x84U);
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if (ret != SD2506_OK) return ret;
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/* 再置 WRTC2=1(bit5) + WRTC3=1(bit4): 0x8C */
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ret = sd2506_write_reg(SD2506_REG_CTR2, 0x8CU);
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if (ret != SD2506_OK) return ret;
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return SD2506_OK;
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}
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/*
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* 关闭写保护 (禁止写入 00H~71H 寄存器)
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* 顺序: 先写 WRTC2=0 + WRTC3=0, 再写 WRTC1=0
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*/
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static int sd2506_write_disable(void)
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{
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int ret;
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/* 先清 WRTC2=0, WRTC3=0: 0x00 */
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ret = sd2506_write_reg(SD2506_REG_CTR2, 0x00U);
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if (ret != SD2506_OK) return ret;
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/* 再清 WRTC1=0, 同时 ARST=1 使能自动复位: 0x20 */
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ret = sd2506_write_reg(SD2506_REG_CTR1, SD2506_CTR1_WRITE_OFF);
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if (ret != SD2506_OK) return ret;
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return SD2506_OK;
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}
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/* ======================== 公共 API 实现 ======================== */
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int sd2506_init(void)
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{
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int ret;
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uint8_t id[8];
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/* 验证 I2C 通信: 尝试读取 8 字节 ID */
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ret = sd2506_read_regs(SD2506_REG_ID_START, id, SD2506_ID_SIZE);
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if (ret != SD2506_OK) {
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return ret;
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}
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/* 上电重置充电寄存器 18H = 82H (开启充电, 5K电阻)
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* 手册强烈建议每次上电时重置此值 */
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ret = sd2506_write_reg(SD2506_REG_CHARGE, 0x82U);
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if (ret != SD2506_OK) {
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return ret;
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}
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/* 配置: 24小时制, 自动复位使能
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* 0FH = 0x20 (bit5=ARST=1, 其它标志位清零)
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* 写入时需注意: 写允许状态下 0FH 的 WRTC 位必须为1
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* 此处直接写入 0x20 即可 (ARST=1, 无 WRTC 位) */
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ret = sd2506_write_reg(SD2506_REG_CTR1, SD2506_CTR1_WRITE_OFF);
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if (ret != SD2506_OK) {
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return ret;
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}
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return SD2506_OK;
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}
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int sd2506_set_time(const sd2506_time_t *time)
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{
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int ret;
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uint8_t buf[7];
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if (time == NULL) {
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return SD2506_ERROR;
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}
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/* 组装 7 字节时间数据 (BCD 码) */
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buf[0] = sd2506_dec_to_bcd(time->second); /* 00H: 秒 */
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buf[1] = sd2506_dec_to_bcd(time->minute); /* 01H: 分 */
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buf[2] = sd2506_dec_to_bcd(time->hour) | 0x80U; /* 02H: 时 (bit7=1, 24小时制) */
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buf[3] = sd2506_dec_to_bcd(time->week); /* 03H: 星期 */
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buf[4] = sd2506_dec_to_bcd(time->day); /* 04H: 日 */
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buf[5] = sd2506_dec_to_bcd(time->month); /* 05H: 月 */
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buf[6] = sd2506_dec_to_bcd(time->year - 2000U); /* 06H: 年 */
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/* 开启写保护 */
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ret = sd2506_write_enable();
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if (ret != SD2506_OK) return ret;
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/* 一次性写入 7 字节时间数据 (00H~06H)
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* 手册要求: 不可单独写某一个时间寄存器，否则可能引起错误进位 */
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ret = sd2506_write_regs(SD2506_REG_SEC, buf, 7);
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if (ret != SD2506_OK) return ret;
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/* 关闭写保护 */
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ret = sd2506_write_disable();
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if (ret != SD2506_OK) return ret;
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return SD2506_OK;
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}
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int sd2506_get_time(sd2506_time_t *time)
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{
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int ret;
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uint8_t buf[7];
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if (time == NULL) {
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return SD2506_ERROR;
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}
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/* 一次读取 7 字节时间数据 (00H~06H)
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* 手册说明: 读取时所有实时数据被锁存，避免错读 */
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ret = sd2506_read_regs(SD2506_REG_SEC, buf, 7);
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if (ret != SD2506_OK) {
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return ret;
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}
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time->second = sd2506_bcd_to_dec(buf[0] & 0x7FU); /* 00H: 秒 */
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time->minute = sd2506_bcd_to_dec(buf[1] & 0x7FU); /* 01H: 分 */
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time->hour = sd2506_bcd_to_dec(buf[2] & 0x7FU); /* 02H: 屏蔽 bit7 (12/24标志) */
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time->week = sd2506_bcd_to_dec(buf[3] & 0x07U); /* 03H: 星期 */
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time->day = sd2506_bcd_to_dec(buf[4] & 0x3FU); /* 04H: 日 */
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time->month = sd2506_bcd_to_dec(buf[5] & 0x1FU); /* 05H: 月 */
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time->year = sd2506_bcd_to_dec(buf[6]) + 2000U; /* 06H: 年 */
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return SD2506_OK;
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}
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int sd2506_get_temperature(int8_t *temp)
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{
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int ret;
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uint8_t val;
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if (temp == NULL) {
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return SD2506_ERROR;
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}
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ret = sd2506_read_reg(SD2506_REG_TEMP, &val);
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if (ret != SD2506_OK) {
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return ret;
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}
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/* bit7 为符号位, 其余为温度值 */
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if (val & 0x80U) {
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/* 负温度: 取补码 */
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*temp = (int8_t)(val | 0xF0U);
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} else {
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/* 正温度 */
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*temp = (int8_t)(val & 0x7FU);
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}
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return SD2506_OK;
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}
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int sd2506_get_battery_voltage(uint16_t *voltage)
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{
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int ret;
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uint8_t val_high, val_low;
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if (voltage == NULL) {
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return SD2506_ERROR;
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}
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/* 读取 1AH bit7 (BAT8_VAL) 和 1BH (BAT_VL) */
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ret = sd2506_read_reg(SD2506_REG_CTR5, &val_high);
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if (ret != SD2506_OK) return ret;
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ret = sd2506_read_reg(SD2506_REG_BAT_VAL, &val_low);
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if (ret != SD2506_OK) return ret;
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/* 组合 9 位: bit8=BAT8_VAL(1AH bit7), bit7~0=BAT_VL(1BH)
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* 如 1AH=80H, 1BH=30H => 电压 = 0x130 = 304 => 3.04V => 3040mV */
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uint16_t raw = ((val_high & 0x80U) << 1) | val_low;
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*voltage = raw * 10; /* 转换为毫伏 (raw 单位 0.01V) */
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return SD2506_OK;
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}
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int sd2506_get_id(uint8_t id[8])
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{
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if (id == NULL) {
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return SD2506_ERROR;
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}
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return sd2506_read_regs(SD2506_REG_ID_START, id, SD2506_ID_SIZE);
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}
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int sd2506_read_sram(uint8_t addr, uint8_t *buf, uint8_t len)
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{
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if (buf == NULL || len == 0 || addr >= SD2506_SRAM_SIZE) {
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return SD2506_ERROR;
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}
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if (addr + len > SD2506_SRAM_SIZE) {
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return SD2506_ERROR;
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}
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return sd2506_read_regs(SD2506_REG_SRAM_START + addr, buf, len);
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}
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int sd2506_write_sram(uint8_t addr, const uint8_t *buf, uint8_t len)
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{
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if (buf == NULL || len == 0 || addr >= SD2506_SRAM_SIZE) {
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return SD2506_ERROR;
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}
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if (addr + len > SD2506_SRAM_SIZE) {
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return SD2506_ERROR;
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}
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/* SRAM 无需开写保护即可写入 (写保护仅对 00H~71H 有效, SRAM 是 2CH~71H)
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* 但为安全起见, SRAM 写入也走写保护流程 */
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int ret;
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ret = sd2506_write_enable();
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if (ret != SD2506_OK) return ret;
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ret = sd2506_write_regs(SD2506_REG_SRAM_START + addr, buf, len);
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if (ret != SD2506_OK) return ret;
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ret = sd2506_write_disable();
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return ret;
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}
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int sd2506_set_alarm(const sd2506_time_t *time, uint8_t mask)
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{
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int ret;
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uint8_t buf[8];
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if (time == NULL) {
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return SD2506_ERROR;
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}
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/* 组装 8 字节报警数据 (07H~0EH) */
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buf[0] = sd2506_dec_to_bcd(time->second) & 0x7FU; /* 07H: 秒报警 */
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buf[1] = sd2506_dec_to_bcd(time->minute) & 0x7FU; /* 08H: 分报警 */
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buf[2] = sd2506_dec_to_bcd(time->hour) & 0x3FU; /* 09H: 时报警 (最高位始终为0) */
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buf[3] = 0x00U; /* 0AH: 星期报警 */
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buf[4] = sd2506_dec_to_bcd(time->day) & 0x3FU; /* 0BH: 日报警 */
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buf[5] = sd2506_dec_to_bcd(time->month) & 0x1FU; /* 0CH: 月报警 */
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buf[6] = sd2506_dec_to_bcd(time->year - 2000U); /* 0DH: 年报警 */
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buf[7] = mask; /* 0EH: 报警允许 */
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/* 开启写保护 */
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ret = sd2506_write_enable();
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if (ret != SD2506_OK) return ret;
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/* 写入报警寄存器 (07H~0EH) */
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ret = sd2506_write_regs(SD2506_REG_AL_SEC, buf, 8);
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if (ret != SD2506_OK) return ret;
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/* 使能报警中断: CTR2 的 INTAE=1, INTS1=0, INTS0=1, IM=1 (周期性) */
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ret = sd2506_write_reg(SD2506_REG_CTR2,
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SD2506_CTR2_INTAE | SD2506_CTR2_INTS0 | SD2506_CTR2_IM);
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if (ret != SD2506_OK) return ret;
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/* 关闭写保护 */
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ret = sd2506_write_disable();
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if (ret != SD2506_OK) return ret;
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return SD2506_OK;
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}
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int sd2506_clear_alarm(void)
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{
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int ret;
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uint8_t val;
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/* 读取 CTR1, ARST=1 时自动清除 INTAF */
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ret = sd2506_read_reg(SD2506_REG_CTR1, &val);
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if (ret != SD2506_OK) {
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return ret;
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}
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return SD2506_OK;
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}
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int sd2506_read_ctr1(uint8_t *val)
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{
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if (val == NULL) {
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return SD2506_ERROR;
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}
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return sd2506_read_reg(SD2506_REG_CTR1, val);
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}
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