初始化

2026-05-01 11:13:45 +08:00
commit bb1d10615e
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+#include "DS1302.h"
+#include "Delay.h"
+
+// 根据连接图.md: DS1302引脚配置
+// CLK: PA4, DAT: PA5, RST: PA6
+
+#define DS1302_SCLK_PIN   GPIO_Pin_4  // CLK
+#define DS1302_IO_PIN     GPIO_Pin_5  // DAT (双向)
+#define DS1302_CE_PIN     GPIO_Pin_6  // RST/CE
+#define DS1302_GPIO       GPIOA
+
+// GPIO控制宏
+#define SCLK_H    GPIO_SetBits(DS1302_GPIO, DS1302_SCLK_PIN)
+#define SCLK_L    GPIO_ResetBits(DS1302_GPIO, DS1302_SCLK_PIN)
+#define DATA_H    GPIO_SetBits(DS1302_GPIO, DS1302_IO_PIN)
+#define DATA_L    GPIO_ResetBits(DS1302_GPIO, DS1302_IO_PIN)
+#define CE_H      GPIO_SetBits(DS1302_GPIO, DS1302_CE_PIN)
+#define CE_L      GPIO_ResetBits(DS1302_GPIO, DS1302_CE_PIN)
+#define DATA_READ GPIO_ReadInputDataBit(DS1302_GPIO, DS1302_IO_PIN)
+
+// DS1302寄存器地址（写地址）
+#define DS1302_SECOND   0x80
+#define DS1302_MINUTE   0x82
+#define DS1302_HOUR     0x84
+#define DS1302_DATE     0x86
+#define DS1302_MONTH    0x88
+#define DS1302_DAY      0x8A
+#define DS1302_YEAR     0x8C
+#define DS1302_WP       0x8E
+
+// BCD码转换
+#define BCD_TO_DEC(bcd)  (((bcd) >> 4) * 10 + ((bcd) & 0x0F))
+#define DEC_TO_BCD(dec)  ((((dec) / 10) << 4) | ((dec) % 10))
+
+// 微秒延时
+static void delay_us(uint32_t us)
+{
+    volatile uint32_t i;
+    while (us--) {
+        for (i = 0; i < 12; i++);  // 72MHz下约1us
+    }
+}
+
+/**
+ * @brief 配置IO口为输出
+ */
+static void DS1302_DATAOUT_init(void)
+{
+    GPIO_InitTypeDef GPIO_InitStructure;
+    GPIO_InitStructure.GPIO_Pin = DS1302_IO_PIN;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(DS1302_GPIO, &GPIO_InitStructure);
+}
+
+/**
+ * @brief 配置IO口为输入
+ */
+static void DS1302_DATAINPUT_init(void)
+{
+    GPIO_InitTypeDef GPIO_InitStructure;
+    GPIO_InitStructure.GPIO_Pin = DS1302_IO_PIN;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
+    GPIO_Init(DS1302_GPIO, &GPIO_InitStructure);
+}
+
+/**
+ * @brief DS1302初始化
+ */
+void DS1302_Init(void)
+{
+    GPIO_InitTypeDef GPIO_InitStructure;
+
+    // 使能GPIOA时钟
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
+
+    // 配置SCLK和CE为推挽输出
+    GPIO_InitStructure.GPIO_Pin = DS1302_SCLK_PIN | DS1302_CE_PIN;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(DS1302_GPIO, &GPIO_InitStructure);
+
+    // 配置IO为输出（初始状态）
+    DS1302_DATAOUT_init();
+
+    // 初始化引脚状态
+    SCLK_L;
+    CE_L;
+}
+
+/**
+ * @brief 向DS1302发送一字节数据（根据demo代码）
+ * @param data 要发送的数据
+ */
+static void DS1302_write_onebyte(uint8_t data)
+{
+    uint8_t count = 0;
+
+    DS1302_DATAOUT_init();  // 配置为输出
+    SCLK_L;
+
+    for (count = 0; count < 8; count++)
+    {
+        SCLK_L;
+
+        // 先准备好数据再发送
+        if (data & 0x01)
+            DATA_H;
+        else
+            DATA_L;
+
+        SCLK_H;  // 拉高时钟线，发送数据
+        data >>= 1;
+    }
+}
+
+/**
+ * @brief 向指定寄存器地址发送数据（根据demo代码）
+ * @param address 寄存器地址
+ * @param data 数据
+ */
+void DS1302_WriteByte(uint8_t address, uint8_t data)
+{
+    CE_L;
+    SCLK_L;
+    delay_us(1);
+
+    CE_H;
+    delay_us(2);
+
+    DS1302_write_onebyte(address);
+    DS1302_write_onebyte(data);
+
+    CE_L;
+    SCLK_L;
+    delay_us(2);
+}
+
+/**
+ * @brief 从指定地址读取一字节数据（根据demo代码）
+ * @param address 寄存器地址
+ * @retval 读取到的数据
+ */
+uint8_t DS1302_ReadByte(uint8_t address)
+{
+    uint8_t count = 0;
+    uint8_t return_data = 0x00;
+
+    CE_L;
+    SCLK_L;
+    delay_us(3);
+
+    CE_H;
+    delay_us(3);
+
+    DS1302_write_onebyte(address);
+
+    DS1302_DATAINPUT_init();  // 配置I/O口为输入
+    delay_us(2);
+
+    for (count = 0; count < 8; count++)
+    {
+        delay_us(2);  // 使电平持续一段时间
+        return_data >>= 1;
+
+        SCLK_H;
+        delay_us(4);  // 使高电平持续一段时间
+
+        SCLK_L;
+        delay_us(14);  // ⭐ 关键延时：延时14us后再去读取电压，更加准确
+
+        if (DATA_READ)
+            return_data = return_data | 0x80;
+    }
+
+    delay_us(2);
+    CE_L;
+    DATA_L;
+
+    return return_data;
+}
+
+/**
+ * @brief 设置DS1302时间
+ * @param time 时间结构体指针
+ */
+void DS1302_SetTime(DS1302_Time* time)
+{
+    // 关闭写保护
+    DS1302_WriteByte(DS1302_WP, 0x00);
+
+    // 写入时间数据（BCD码格式）
+    DS1302_WriteByte(DS1302_SECOND, DEC_TO_BCD(time->second));
+    DS1302_WriteByte(DS1302_MINUTE, DEC_TO_BCD(time->minute));
+    DS1302_WriteByte(DS1302_HOUR,   DEC_TO_BCD(time->hour));
+    DS1302_WriteByte(DS1302_DATE,   DEC_TO_BCD(time->day));
+    DS1302_WriteByte(DS1302_MONTH,  DEC_TO_BCD(time->month));
+    DS1302_WriteByte(DS1302_DAY,    DEC_TO_BCD(time->week));
+    DS1302_WriteByte(DS1302_YEAR,   DEC_TO_BCD(time->year % 100));
+
+    // 开启写保护
+    DS1302_WriteByte(DS1302_WP, 0x80);
+}
+
+/**
+ * @brief 读取DS1302时间
+ * @param time 时间结构体指针
+ */
+void DS1302_GetTime(DS1302_Time* time)
+{
+    uint8_t read_time[7];
+    uint8_t hour_reg;
+
+    // 读取时间数据（BCD码）
+    read_time[0] = DS1302_ReadByte(0x81);  // 读秒
+    read_time[1] = DS1302_ReadByte(0x83);  // 读分
+    read_time[2] = DS1302_ReadByte(0x85);  // 读时
+    read_time[3] = DS1302_ReadByte(0x87);  // 读日
+    read_time[4] = DS1302_ReadByte(0x89);  // 读月
+    read_time[5] = DS1302_ReadByte(0x8B);  // 读星期
+    read_time[6] = DS1302_ReadByte(0x8D);  // 读年
+
+    // BCD码转换为10进制（先屏蔽控制位，再转换）
+    time->second = BCD_TO_DEC(read_time[0] & 0x7F); // bit7=CH
+    time->minute = BCD_TO_DEC(read_time[1] & 0x7F);
+
+    hour_reg = read_time[2];
+    if (hour_reg & 0x80) {
+        // 12小时制：bit5=PM, bit4~0=小时(1~12)
+        uint8_t hour12 = BCD_TO_DEC(hour_reg & 0x1F);
+        uint8_t is_pm = (hour_reg & 0x20) ? 1 : 0;
+        if (hour12 == 12) {
+            time->hour = is_pm ? 12 : 0;
+        } else {
+            time->hour = is_pm ? (hour12 + 12) : hour12;
+        }
+    } else {
+        // 24小时制：bit5~0=小时(0~23)
+        time->hour = BCD_TO_DEC(hour_reg & 0x3F);
+    }
+
+    time->day    = BCD_TO_DEC(read_time[3] & 0x3F);
+    time->month  = BCD_TO_DEC(read_time[4] & 0x1F);
+    time->week   = read_time[5] & 0x07;
+    time->year   = BCD_TO_DEC(read_time[6]) + 2000;
+}