{"id":39766,"date":"2025-05-25T22:08:35","date_gmt":"2025-05-25T14:08:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/39766.html"},"modified":"2025-05-25T22:08:35","modified_gmt":"2025-05-25T14:08:35","slug":"%e6%89%8b%e6%92%95i2c%e5%92%8cspi%e5%8d%8f%e8%ae%ae%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/39766.html","title":{"rendered":"\u624b\u6495I2C\u548cSPI\u534f\u8bae\u5b9e\u73b0"},"content":{"rendered":"

\u624b\u6495I2C\u548cSPI\u534f\u8bae\u5b9e\u73b0<\/h2>\n

\u76ee\u5f55<\/h3>\n
  • I2C\u534f\u8bae\u539f\u7406<\/li>\n
  • I2C\u4f4d\u64cd\u4f5c\u5b9e\u73b0<\/li>\n
  • I2C\u9a71\u52a8\u4ee3\u7801\u7f16\u5199<\/li>\n
  • SPI\u534f\u8bae\u539f\u7406<\/li>\n
  • SPI\u4f4d\u64cd\u4f5c\u5b9e\u73b0<\/li>\n
  • SPI\u9a71\u52a8\u4ee3\u7801\u7f16\u5199<\/li>\n

    I2C\u534f\u8bae\u539f\u7406<\/h3>\n

    I2C（Inter-Integrated Circuit）\u662f\u4e00\u79cd\u4e32\u884c\u901a\u4fe1\u603b\u7ebf，\u4f7f\u7528\u4e24\u6839\u7ebf：SCL（\u65f6\u949f\u7ebf）\u548cSDA（\u6570\u636e\u7ebf）\u3002<\/p>\n

    \u57fa\u672c\u7279\u6027<\/h4>\n
      \n
    • \u4e3b\u4ece\u67b6\u6784<\/li>\n
    • \u53cc\u5411\u534a\u53cc\u5de5\u901a\u4fe1<\/li>\n
    • \u6bcf\u4e2a\u8bbe\u5907\u90fd\u6709\u552f\u4e00\u5730\u5740<\/li>\n
    • \u652f\u6301\u591a\u4e3b\u8bbe\u5907<\/li>\n
    • \u901a\u4fe1\u901f\u7387\u901a\u5e38\u4e3a100kHz(\u6807\u51c6\u6a21\u5f0f)\u3001400kHz(\u5feb\u901f\u6a21\u5f0f)\u62161MHz\u4ee5\u4e0a(\u9ad8\u901f\u6a21\u5f0f)<\/li>\n<\/ul>\n

      \u4fe1\u53f7\u72b6\u6001<\/h4>\n
        \n
      • \u7a7a\u95f2\u72b6\u6001：SCL\u548cSDA\u5747\u4e3a\u9ad8\u7535\u5e73<\/li>\n
      • \u8d77\u59cb\u4fe1\u53f7(START)：SCL\u9ad8\u7535\u5e73\u65f6，SDA\u4ece\u9ad8\u53d8\u4f4e<\/li>\n
      • \u505c\u6b62\u4fe1\u53f7(STOP)：SCL\u9ad8\u7535\u5e73\u65f6，SDA\u4ece\u4f4e\u53d8\u9ad8<\/li>\n
      • \u6570\u636e\u4f4d：SCL\u4f4e\u7535\u5e73\u65f6，\u51c6\u5907\u6570\u636e；SCL\u9ad8\u7535\u5e73\u65f6，\u91c7\u6837\u6570\u636e<\/li>\n
      • \u5e94\u7b54\u4fe1\u53f7(ACK)：\u63a5\u6536\u65b9\u5728\u7b2c9\u4e2a\u65f6\u949f\u5468\u671f\u5c06SDA\u62c9\u4f4e\u8868\u793a\u63a5\u6536\u6210\u529f<\/li>\n<\/ul>\n

        \u901a\u4fe1\u6d41\u7a0b<\/h4>\n
      • \u4e3b\u8bbe\u5907\u53d1\u9001\u8d77\u59cb\u4fe1\u53f7(START)<\/li>\n
      • \u53d1\u9001\u4ece\u8bbe\u5907\u5730\u5740(7\u4f4d)\u548c\u8bfb\/\u5199\u4f4d(1\u4f4d)<\/li>\n
      • \u4ece\u8bbe\u5907\u53d1\u9001\u5e94\u7b54(ACK)<\/li>\n
      • \u6570\u636e\u4f20\u8f93(8\u4f4d\u4e00\u7ec4)，\u6bcf\u7ec4\u540e\u8ddf\u5e94\u7b54\u4f4d<\/li>\n
      • \u4e3b\u8bbe\u5907\u53d1\u9001\u505c\u6b62\u4fe1\u53f7(STOP)<\/li>\n

        I2C\u4f4d\u64cd\u4f5c\u5b9e\u73b0<\/h3>\n

        \u9996\u5148\u9700\u8981\u5b9e\u73b0\u57fa\u672c\u7684I2C\u5e95\u5c42\u51fd\u6570：<\/p>\n

        GPIO\u914d\u7f6e<\/h4>\n

        \/\/ \u914d\u7f6eGPIO\u4e3a\u5f00\u6f0f\u8f93\u51fa\u6a21\u5f0f<\/span>
        \nvoid<\/span> I2C_GPIO_Config<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
        \n \/\/ \u4f7f\u80fdGPIO\u65f6\u949f<\/span>
        \n RCC_APB2PeriphClockCmd<\/span>(<\/span>RCC_APB2Periph_GPIOB,<\/span> ENABLE)<\/span>;<\/span><\/p>\n

        GPIO_InitTypeDef GPIO_InitStructure;<\/span>
        \n GPIO_InitStructure.<\/span>GPIO_Pin =<\/span> GPIO_Pin_6 |<\/span> GPIO_Pin_7;<\/span> \/\/ SCL: PB6, SDA: PB7<\/span>
        \n GPIO_InitStructure.<\/span>GPIO_Mode =<\/span> GPIO_Mode_Out_OD;<\/span> \/\/ \u5f00\u6f0f\u8f93\u51fa<\/span>
        \n GPIO_InitStructure.<\/span>GPIO_Speed =<\/span> GPIO_Speed_50MHz;<\/span>
        \n GPIO_Init<\/span>(<\/span>GPIOB,<\/span> &<\/span>GPIO_InitStructure)<\/span>;<\/span><\/p>\n

        \/\/ \u7a7a\u95f2\u72b6\u6001，\u5747\u4e3a\u9ad8\u7535\u5e73<\/span>
        \n GPIO_SetBits<\/span>(<\/span>GPIOB,<\/span> GPIO_Pin_6 |<\/span> GPIO_Pin_7)<\/span>;<\/span>
        \n}<\/span><\/p>\n

        I2C\u57fa\u672c\u64cd\u4f5c\u51fd\u6570<\/h4>\n

        \/\/ SCL\u548cSDA\u63a7\u5236\u51fd\u6570<\/span>
        \n#<\/span>define<\/span> SCL_H<\/span> GPIO_SetBits<\/span>(<\/span>GPIOB,<\/span> GPIO_Pin_6)<\/span><\/span><\/span>
        \n#<\/span>define<\/span> SCL_L<\/span> GPIO_ResetBits<\/span>(<\/span>GPIOB,<\/span> GPIO_Pin_6)<\/span><\/span><\/span>
        \n#<\/span>define<\/span> SDA_H<\/span> GPIO_SetBits<\/span>(<\/span>GPIOB,<\/span> GPIO_Pin_7)<\/span><\/span><\/span>
        \n#<\/span>define<\/span> SDA_L<\/span> GPIO_ResetBits<\/span>(<\/span>GPIOB,<\/span> GPIO_Pin_7)<\/span><\/span><\/span>
        \n#<\/span>define<\/span> SDA_READ<\/span> GPIO_ReadInputDataBit<\/span>(<\/span>GPIOB,<\/span> GPIO_Pin_7)<\/span><\/span><\/span><\/p>\n

        \/\/ \u5ef6\u8fdf\u51fd\u6570<\/span>
        \nvoid<\/span> I2C_Delay<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
        \n uint8_t<\/span> i =<\/span> 10<\/span>;<\/span> \/\/ \u53ef\u6839\u636e\u65f6\u949f\u9891\u7387\u8c03\u6574<\/span>
        \n while<\/span>(<\/span>i—<\/span>)<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u8d77\u59cb\u4fe1\u53f7<\/span>
        \nvoid<\/span> I2C_Start<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
        \n SDA_H;<\/span>
        \n SCL_H;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SDA_L;<\/span> \/\/ SDA\u4ece\u9ad8\u5230\u4f4e，\u4ea7\u751f\u8d77\u59cb\u4fe1\u53f7<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_L;<\/span> \/\/ \u94b3\u4f4fI2C\u603b\u7ebf，\u51c6\u5907\u53d1\u9001\u6216\u63a5\u6536\u6570\u636e<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u505c\u6b62\u4fe1\u53f7<\/span>
        \nvoid<\/span> I2C_Stop<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
        \n SDA_L;<\/span>
        \n SCL_H;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SDA_H;<\/span> \/\/ SDA\u4ece\u4f4e\u5230\u9ad8，\u4ea7\u751f\u505c\u6b62\u4fe1\u53f7<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u7b49\u5f85\u5e94\u7b54<\/span>
        \nuint8_t<\/span> I2C_WaitAck<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
        \n uint8_t<\/span> ack;<\/span><\/p>\n

        SDA_H;<\/span> \/\/ \u91ca\u653eSDA<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_H;<\/span> \/\/ \u4ea7\u751f\u65f6\u949f\u8109\u51b2<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n ack =<\/span> SDA_READ;<\/span> \/\/ \u8bfb\u53d6SDA\u72b6\u6001<\/span>
        \n SCL_L;<\/span>
        \n return<\/span> ack;<\/span> \/\/ \u8fd4\u56de0\u8868\u793a\u6709\u5e94\u7b54<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u53d1\u9001\u5e94\u7b54<\/span>
        \nvoid<\/span> I2C_Ack<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
        \n SDA_L;<\/span> \/\/ SDA\u62c9\u4f4e，\u8868\u793aACK<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_H;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_L;<\/span>
        \n SDA_H;<\/span> \/\/ \u91ca\u653eSDA<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u53d1\u9001\u975e\u5e94\u7b54<\/span>
        \nvoid<\/span> I2C_NAck<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
        \n SDA_H;<\/span> \/\/ SDA\u4fdd\u6301\u9ad8\u7535\u5e73，\u8868\u793aNACK<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_H;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_L;<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u53d1\u9001\u4e00\u4e2a\u5b57\u8282<\/span>
        \nvoid<\/span> I2C_SendByte<\/span>(<\/span>uint8_t<\/span> byte)<\/span> {<\/span>
        \n uint8_t<\/span> i =<\/span> 8<\/span>;<\/span><\/p>\n

        while<\/span>(<\/span>i—<\/span>)<\/span> {<\/span>
        \n SCL_L;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n if<\/span>(<\/span>byte &<\/span> 0x80<\/span>)<\/span>
        \n SDA_H;<\/span>
        \n else<\/span>
        \n SDA_L;<\/span>
        \n byte <<=<\/span> 1<\/span>;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_H;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n }<\/span>
        \n SCL_L;<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282<\/span>
        \nuint8_t<\/span> I2C_ReadByte<\/span>(<\/span>uint8_t<\/span> ack)<\/span> {<\/span>
        \n uint8_t<\/span> i =<\/span> 8<\/span>;<\/span>
        \n uint8_t<\/span> byte =<\/span> 0<\/span>;<\/span><\/p>\n

        SDA_H;<\/span> \/\/ \u91ca\u653eSDA，\u51c6\u5907\u8bfb\u53d6\u6570\u636e<\/span>
        \n while<\/span>(<\/span>i—<\/span>)<\/span> {<\/span>
        \n byte <<=<\/span> 1<\/span>;<\/span>
        \n SCL_L;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n SCL_H;<\/span>
        \n I2C_Delay<\/span>(<\/span>)<\/span>;<\/span>
        \n if<\/span>(<\/span>SDA_READ)<\/span>
        \n byte |=<\/span> 0x01<\/span>;<\/span>
        \n }<\/span>
        \n SCL_L;<\/span><\/p>\n

        if<\/span>(<\/span>ack)<\/span>
        \n I2C_Ack<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u53d1\u9001\u5e94\u7b54<\/span>
        \n else<\/span>
        \n I2C_NAck<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u53d1\u9001\u975e\u5e94\u7b54<\/span><\/p>\n

        return<\/span> byte;<\/span>
        \n}<\/span><\/p>\n

        I2C\u9a71\u52a8\u4ee3\u7801\u7f16\u5199<\/h3>\n

        \u57fa\u4e8e\u4e0a\u9762\u7684\u5e95\u5c42\u51fd\u6570，\u5b9e\u73b0\u8bbe\u5907\u8bfb\u5199\u64cd\u4f5c：<\/p>\n

        \/\/ \u5199\u5165\u4e00\u4e2a\u5b57\u8282\u5230\u6307\u5b9a\u8bbe\u5907\u7684\u6307\u5b9a\u5bc4\u5b58\u5668<\/span>
        \nuint8_t<\/span> I2C_WriteReg<\/span>(<\/span>uint8_t<\/span> DevAddr,<\/span> uint8_t<\/span> RegAddr,<\/span> uint8_t<\/span> data)<\/span> {<\/span>
        \n I2C_Start<\/span>(<\/span>)<\/span>;<\/span>
        \n I2C_SendByte<\/span>(<\/span>DevAddr <<<\/span> 1<\/span>)<\/span>;<\/span> \/\/ \u8bbe\u5907\u5730\u5740 + \u5199\u4f4d(0)<\/span>
        \n if<\/span>(<\/span>I2C_WaitAck<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n I2C_Stop<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> 1<\/span>;<\/span> \/\/ \u65e0\u5e94\u7b54，\u5931\u8d25<\/span>
        \n }<\/span><\/p>\n

        I2C_SendByte<\/span>(<\/span>RegAddr)<\/span>;<\/span> \/\/ \u5bc4\u5b58\u5668\u5730\u5740<\/span>
        \n if<\/span>(<\/span>I2C_WaitAck<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n I2C_Stop<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> 1<\/span>;<\/span>
        \n }<\/span><\/p>\n

        I2C_SendByte<\/span>(<\/span>data)<\/span>;<\/span> \/\/ \u5199\u5165\u6570\u636e<\/span>
        \n if<\/span>(<\/span>I2C_WaitAck<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n I2C_Stop<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> 1<\/span>;<\/span>
        \n }<\/span><\/p>\n

        I2C_Stop<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> 0<\/span>;<\/span> \/\/ \u6210\u529f<\/span>
        \n}<\/span><\/p>\n

        \/\/ \u4ece\u6307\u5b9a\u8bbe\u5907\u7684\u6307\u5b9a\u5bc4\u5b58\u5668\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282<\/span>
        \nuint8_t<\/span> I2C_ReadReg<\/span>(<\/span>uint8_t<\/span> DevAddr,<\/span> uint8_t<\/span> RegAddr)<\/span> {<\/span>
        \n uint8_t<\/span> data;<\/span><\/p>\n

        I2C_Start<\/span>(<\/span>)<\/span>;<\/span>
        \n I2C_SendByte<\/span>(<\/span>DevAddr <<<\/span> 1<\/span>)<\/span>;<\/span> \/\/ \u8bbe\u5907\u5730\u5740 + \u5199\u4f4d(0)<\/span>
        \n if<\/span>(<\/span>I2C_WaitAck<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n I2C_Stop<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> 0xFF<\/span>;<\/span> \/\/ \u65e0\u5e94\u7b54，\u5931\u8d25<\/span>
        \n }<\/span><\/p>\n

        I2C_SendByte<\/span>(<\/span>RegAddr)<\/span>;<\/span> \/\/ \u5bc4\u5b58\u5668\u5730\u5740<\/span>
        \n if<\/span>(<\/span>I2C_WaitAck<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n I2C_Stop<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> 0xFF<\/span>;<\/span>
        \n }<\/span><\/p>\n

        I2C_Start<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u91cd\u590d\u8d77\u59cb<\/span>
        \n I2C_SendByte<\/span>(<\/span>(<\/span>DevAddr <<<\/span> 1<\/span>)<\/span> |<\/span> 0x01<\/span>)<\/span>;<\/span> \/\/ \u8bbe\u5907\u5730\u5740 + \u8bfb\u4f4d(1)<\/span>
        \n if<\/span>(<\/span>I2C_WaitAck<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
        \n I2C_Stop<\/span>(<\/span>)<\/span>;<\/span>
        \n return<\/span> 0xFF<\/span>;<\/span>
        \n }<\/span><\/p>\n

        data =<\/span> I2C_ReadByte<\/span>(<\/span>0<\/span>)<\/span>;<\/span> \/\/ \u8bfb\u53d6\u6570\u636e，\u53d1\u9001\u975e\u5e94\u7b54<\/span>
        \n I2C_Stop<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

        return<\/span> data;<\/span>
        \n}<\/span><\/p>\n

        \u5b9e\u9645\u5e94\u7528\u793a\u4f8b：MPU6050\u8bfb\u53d6\u6570\u636e<\/h4>\n

        #<\/span>define<\/span> MPU6050_ADDR<\/span> 0x68<\/span> <\/span>\/\/ MPU6050\u8bbe\u5907\u5730\u5740<\/span><\/span><\/p>\n

        void<\/span> MPU6050_Init<\/span>(<\/span>)<\/span> {<\/span>
        \n I2C_WriteReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x6B<\/span>,<\/span> 0x00<\/span>)<\/span>;<\/span> \/\/ \u5524\u9192MPU6050<\/span>
        \n I2C_WriteReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x19<\/span>,<\/span> 0x07<\/span>)<\/span>;<\/span> \/\/ \u91c7\u6837\u7387\u8bbe\u7f6e<\/span>
        \n I2C_WriteReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x1A<\/span>,<\/span> 0x06<\/span>)<\/span>;<\/span> \/\/ \u914d\u7f6e\u6570\u5b57\u4f4e\u901a\u6ee4\u6ce2\u5668<\/span>
        \n I2C_WriteReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x1B<\/span>,<\/span> 0x18<\/span>)<\/span>;<\/span> \/\/ \u9640\u87ba\u4eea\u91cf\u7a0b：\u00b12000dps<\/span>
        \n I2C_WriteReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x1C<\/span>,<\/span> 0x01<\/span>)<\/span>;<\/span> \/\/ \u52a0\u901f\u5ea6\u8ba1\u91cf\u7a0b：\u00b12g<\/span>
        \n}<\/span><\/p>\n

        void<\/span> MPU6050_GetAcceleration<\/span>(<\/span>int16_t<\/span> *<\/span>ax,<\/span> int16_t<\/span> *<\/span>ay,<\/span> int16_t<\/span> *<\/span>az)<\/span> {<\/span>
        \n uint8_t<\/span> buf[<\/span>6<\/span>]<\/span>;<\/span><\/p>\n

        \/\/ \u8bfb\u53d6\u52a0\u901f\u5ea6\u8ba1\u6570\u636e<\/span>
        \n buf[<\/span>0<\/span>]<\/span> =<\/span> I2C_ReadReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x3B<\/span>)<\/span>;<\/span>
        \n buf[<\/span>1<\/span>]<\/span> =<\/span> I2C_ReadReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x3C<\/span>)<\/span>;<\/span>
        \n buf[<\/span>2<\/span>]<\/span> =<\/span> I2C_ReadReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x3D<\/span>)<\/span>;<\/span>
        \n buf[<\/span>3<\/span>]<\/span> =<\/span> I2C_ReadReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x3E<\/span>)<\/span>;<\/span>
        \n buf[<\/span>4<\/span>]<\/span> =<\/span> I2C_ReadReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x3F<\/span>)<\/span>;<\/span>
        \n buf[<\/span>5<\/span>]<\/span> =<\/span> I2C_ReadReg<\/span>(<\/span>MPU6050_ADDR,<\/span> 0x40<\/span>)<\/span>;<\/span><\/p>\n

        *<\/span>ax =<\/span> (<\/span>buf[<\/span>0<\/span>]<\/span> <<<\/span> 8<\/span>)<\/span> |<\/span> buf[<\/span>1<\/span>]<\/span>;<\/span>
        \n *<\/span>ay =<\/span> (<\/span>buf[<\/span>2<\/span>]<\/span> <<<\/span> 8<\/span>)<\/span> |<\/span> buf[<\/span>3<\/span>]<\/span>;<\/span>
        \n *<\/span>az =<\/span> (<\/span>buf[<\/span>4<\/span>]<\/span> <<<\/span> 8<\/span>)<\/span> |<\/span> buf[<\/span>5<\/span>]<\/span>;<\/span>
        \n}<\/span><\/p>\n

        SPI\u534f\u8bae\u539f\u7406<\/h3>\n

        SPI（Serial Peripheral Interface）\u662f\u4e00\u79cd\u540c\u6b65\u4e32\u884c\u901a\u4fe1\u63a5\u53e3，\u4f7f\u7528\u56db\u6839\u7ebf：<\/p>\n

        \u57fa\u672c\u7279\u6027<\/h4>\n
          \n
        • MOSI (Master Out Slave In)：\u4e3b\u8bbe\u5907\u53d1\u9001，\u4ece\u8bbe\u5907\u63a5\u6536<\/li>\n
        • MISO (Master In Slave Out)：\u4e3b\u8bbe\u5907\u63a5\u6536，\u4ece\u8bbe\u5907\u53d1\u9001<\/li>\n
        • SCK (Serial Clock)：\u65f6\u949f\u4fe1\u53f7，\u7531\u4e3b\u8bbe\u5907\u4ea7\u751f<\/li>\n
        • SS\/CS (Slave Select\/Chip Select)：\u7247\u9009\u4fe1\u53f7，\u7528\u4e8e\u9009\u62e9\u4ece\u8bbe\u5907<\/li>\n<\/ul>\n

          \u5de5\u4f5c\u6a21\u5f0f<\/h4>\n

          SPI\u6709\u56db\u79cd\u5de5\u4f5c\u6a21\u5f0f，\u7531CPOL（\u65f6\u949f\u6781\u6027）\u548cCPHA（\u65f6\u949f\u76f8\u4f4d）\u51b3\u5b9a：<\/p>\n

            \n
          • \u6a21\u5f0f0：CPOL=0, CPHA=0，\u7a7a\u95f2\u65f6SCK\u4f4e\u7535\u5e73，\u7b2c\u4e00\u4e2a\u8fb9\u6cbf\u91c7\u6837<\/li>\n
          • \u6a21\u5f0f1：CPOL=0, CPHA=1，\u7a7a\u95f2\u65f6SCK\u4f4e\u7535\u5e73，\u7b2c\u4e8c\u4e2a\u8fb9\u6cbf\u91c7\u6837<\/li>\n
          • \u6a21\u5f0f2：CPOL=1, CPHA=0，\u7a7a\u95f2\u65f6SCK\u9ad8\u7535\u5e73，\u7b2c\u4e00\u4e2a\u8fb9\u6cbf\u91c7\u6837<\/li>\n
          • \u6a21\u5f0f3：CPOL=1, CPHA=1，\u7a7a\u95f2\u65f6SCK\u9ad8\u7535\u5e73，\u7b2c\u4e8c\u4e2a\u8fb9\u6cbf\u91c7\u6837<\/li>\n<\/ul>\n

            \u901a\u4fe1\u6d41\u7a0b<\/h4>\n
          • \u4e3b\u8bbe\u5907\u5c06\u5bf9\u5e94\u4ece\u8bbe\u5907\u7684CS\u7ebf\u62c9\u4f4e（\u6fc0\u6d3b）<\/li>\n
          • \u4e3b\u8bbe\u5907\u901a\u8fc7SCK\u4ea7\u751f\u65f6\u949f\u4fe1\u53f7<\/li>\n
          • \u6570\u636e\u901a\u8fc7MOSI\u548cMISO\u7ebf\u540c\u65f6\u53cc\u5411\u4f20\u8f93<\/li>\n
          • \u4f20\u8f93\u5b8c\u6210\u540e，\u4e3b\u8bbe\u5907\u5c06CS\u7ebf\u62c9\u9ad8（\u91ca\u653e）<\/li>\n

            SPI\u4f4d\u64cd\u4f5c\u5b9e\u73b0<\/h3>\n

            GPIO\u914d\u7f6e<\/h4>\n

            \/\/ \u914d\u7f6eSPI GPIO<\/span>
            \nvoid<\/span> SPI_GPIO_Config<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
            \n \/\/ \u4f7f\u80fdGPIO\u65f6\u949f<\/span>
            \n RCC_APB2PeriphClockCmd<\/span>(<\/span>RCC_APB2Periph_GPIOA,<\/span> ENABLE)<\/span>;<\/span><\/p>\n

            GPIO_InitTypeDef GPIO_InitStructure;<\/span><\/p>\n

            \/\/ \u914d\u7f6eSCK\u3001MOSI\u4e3a\u63a8\u633d\u8f93\u51fa<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Pin =<\/span> GPIO_Pin_5 |<\/span> GPIO_Pin_7;<\/span> \/\/ SCK: PA5, MOSI: PA7<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Mode =<\/span> GPIO_Mode_Out_PP;<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Speed =<\/span> GPIO_Speed_50MHz;<\/span>
            \n GPIO_Init<\/span>(<\/span>GPIOA,<\/span> &<\/span>GPIO_InitStructure)<\/span>;<\/span><\/p>\n

            \/\/ \u914d\u7f6eMISO\u4e3a\u6d6e\u7a7a\u8f93\u5165<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Pin =<\/span> GPIO_Pin_6;<\/span> \/\/ MISO: PA6<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Mode =<\/span> GPIO_Mode_IN_FLOATING;<\/span>
            \n GPIO_Init<\/span>(<\/span>GPIOA,<\/span> &<\/span>GPIO_InitStructure)<\/span>;<\/span><\/p>\n

            \/\/ \u914d\u7f6eCS\u4e3a\u63a8\u633d\u8f93\u51fa<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Pin =<\/span> GPIO_Pin_4;<\/span> \/\/ CS: PA4<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Mode =<\/span> GPIO_Mode_Out_PP;<\/span>
            \n GPIO_InitStructure.<\/span>GPIO_Speed =<\/span> GPIO_Speed_50MHz;<\/span>
            \n GPIO_Init<\/span>(<\/span>GPIOA,<\/span> &<\/span>GPIO_InitStructure)<\/span>;<\/span><\/p>\n

            \/\/ \u521d\u59cb\u72b6\u6001：CS\u9ad8，SCK\u4f4e<\/span>
            \n GPIO_SetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_4)<\/span>;<\/span> \/\/ CS\u9ad8\u7535\u5e73，\u4e0d\u9009\u4e2d\u4ece\u8bbe\u5907<\/span>
            \n GPIO_ResetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_5)<\/span>;<\/span> \/\/ SCK\u4f4e\u7535\u5e73，\u6a21\u5f0f0\u521d\u59cb\u72b6\u6001<\/span>
            \n}<\/span><\/p>\n

            SPI\u57fa\u672c\u64cd\u4f5c\u51fd\u6570<\/h4>\n

            \/\/ SPI\u5f15\u811a\u5b9a\u4e49<\/span>
            \n#<\/span>define<\/span> SPI_CS_H<\/span> GPIO_SetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_4)<\/span><\/span><\/span>
            \n#<\/span>define<\/span> SPI_CS_L<\/span> GPIO_ResetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_4)<\/span><\/span><\/span>
            \n#<\/span>define<\/span> SPI_SCK_H<\/span> GPIO_SetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_5)<\/span><\/span><\/span>
            \n#<\/span>define<\/span> SPI_SCK_L<\/span> GPIO_ResetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_5)<\/span><\/span><\/span>
            \n#<\/span>define<\/span> SPI_MOSI_H<\/span> GPIO_SetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_7)<\/span><\/span><\/span>
            \n#<\/span>define<\/span> SPI_MOSI_L<\/span> GPIO_ResetBits<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_7)<\/span><\/span><\/span>
            \n#<\/span>define<\/span> SPI_MISO<\/span> GPIO_ReadInputDataBit<\/span>(<\/span>GPIOA,<\/span> GPIO_Pin_6)<\/span><\/span><\/span><\/p>\n

            \/\/ \u5ef6\u8fdf\u51fd\u6570<\/span>
            \nvoid<\/span> SPI_Delay<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
            \n uint8_t<\/span> i =<\/span> 2<\/span>;<\/span>
            \n while<\/span>(<\/span>i—<\/span>)<\/span>;<\/span>
            \n}<\/span><\/p>\n

            \/\/ SPI\u53d1\u9001\u5e76\u63a5\u6536\u4e00\u4e2a\u5b57\u8282（\u6a21\u5f0f0）<\/span>
            \nuint8_t<\/span> SPI_ReadWriteByte<\/span>(<\/span>uint8_t<\/span> data)<\/span> {<\/span>
            \n uint8_t<\/span> i;<\/span>
            \n uint8_t<\/span> temp =<\/span> 0<\/span>;<\/span><\/p>\n

            for<\/span>(<\/span>i =<\/span> 0<\/span>;<\/span> i <<\/span> 8<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
            \n \/\/ \u51c6\u5907\u53d1\u9001\u6570\u636e<\/span>
            \n if<\/span>(<\/span>data &<\/span> 0x80<\/span>)<\/span>
            \n SPI_MOSI_H;<\/span>
            \n else<\/span>
            \n SPI_MOSI_L;<\/span>
            \n data <<=<\/span> 1<\/span>;<\/span> \/\/ \u5de6\u79fb\u4e00\u4f4d，\u51c6\u5907\u4e0b\u4e00\u4f4d<\/span>
            \n SPI_Delay<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

            SPI_SCK_H;<\/span> \/\/ \u65f6\u949f\u4e0a\u5347\u6cbf，\u4ece\u8bbe\u5907\u91c7\u6837MOSI<\/span>
            \n SPI_Delay<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

            temp <<=<\/span> 1<\/span>;<\/span> \/\/ \u5de6\u79fb\u4e00\u4f4d，\u4e3a\u63a5\u6536\u65b0\u7684\u6570\u636e\u4f4d\u817e\u51fa\u7a7a\u95f4<\/span>
            \n if<\/span>(<\/span>SPI_MISO)<\/span>
            \n temp++<\/span>;<\/span> \/\/ \u5982\u679cMISO\u4e3a\u9ad8，\u5219\u7f6e1<\/span><\/p>\n

            SPI_SCK_L;<\/span> \/\/ \u65f6\u949f\u4e0b\u964d\u6cbf，\u4e3b\u8bbe\u5907\u91c7\u6837MISO<\/span>
            \n SPI_Delay<\/span>(<\/span>)<\/span>;<\/span>
            \n }<\/span><\/p>\n

            return<\/span> temp;<\/span> \/\/ \u8fd4\u56de\u63a5\u6536\u5230\u7684\u6570\u636e<\/span>
            \n}<\/span><\/p>\n

            SPI\u9a71\u52a8\u4ee3\u7801\u7f16\u5199<\/h3>\n

            \u57fa\u4e8e\u4e0a\u9762\u7684\u5e95\u5c42\u51fd\u6570，\u5b9e\u73b0\u8bbe\u5907\u8bfb\u5199\u64cd\u4f5c：<\/p>\n

            \/\/ \u5411\u6307\u5b9a\u5bc4\u5b58\u5668\u5199\u5165\u4e00\u4e2a\u5b57\u8282<\/span>
            \nvoid<\/span> SPI_WriteReg<\/span>(<\/span>uint8_t<\/span> reg,<\/span> uint8_t<\/span> value)<\/span> {<\/span>
            \n SPI_CS_L;<\/span> \/\/ \u4f7f\u80fd\u7247\u9009<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>reg)<\/span>;<\/span> \/\/ \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>value)<\/span>;<\/span> \/\/ \u53d1\u9001\u6570\u636e<\/span>
            \n SPI_CS_H;<\/span> \/\/ \u7981\u7528\u7247\u9009<\/span>
            \n}<\/span><\/p>\n

            \/\/ \u4ece\u6307\u5b9a\u5bc4\u5b58\u5668\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282<\/span>
            \nuint8_t<\/span> SPI_ReadReg<\/span>(<\/span>uint8_t<\/span> reg)<\/span> {<\/span>
            \n uint8_t<\/span> value;<\/span><\/p>\n

            SPI_CS_L;<\/span> \/\/ \u4f7f\u80fd\u7247\u9009<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>reg |<\/span> 0x80<\/span>)<\/span>;<\/span> \/\/ \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740（\u6700\u9ad8\u4f4d\u7f6e1\u8868\u793a\u8bfb\u64cd\u4f5c）<\/span>
            \n value =<\/span> SPI_ReadWriteByte<\/span>(<\/span>0xFF<\/span>)<\/span>;<\/span> \/\/ \u53d1\u9001\u4efb\u610f\u503c，\u8bfb\u53d6\u7ed3\u679c<\/span>
            \n SPI_CS_H;<\/span> \/\/ \u7981\u7528\u7247\u9009<\/span><\/p>\n

            return<\/span> value;<\/span>
            \n}<\/span><\/p>\n

            \/\/ \u4ece\u6307\u5b9a\u5bc4\u5b58\u5668\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282<\/span>
            \nvoid<\/span> SPI_ReadMulti<\/span>(<\/span>uint8_t<\/span> reg,<\/span> uint8_t<\/span> *<\/span>buf,<\/span> uint8_t<\/span> len)<\/span> {<\/span>
            \n SPI_CS_L;<\/span> \/\/ \u4f7f\u80fd\u7247\u9009<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>reg |<\/span> 0x80<\/span>)<\/span>;<\/span> \/\/ \u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740（\u6700\u9ad8\u4f4d\u7f6e1\u8868\u793a\u8bfb\u64cd\u4f5c）<\/span><\/p>\n

            while<\/span>(<\/span>len—<\/span>)<\/span> {<\/span>
            \n *<\/span>buf =<\/span> SPI_ReadWriteByte<\/span>(<\/span>0xFF<\/span>)<\/span>;<\/span>
            \n buf++<\/span>;<\/span>
            \n }<\/span><\/p>\n

            SPI_CS_H;<\/span> \/\/ \u7981\u7528\u7247\u9009<\/span>
            \n}<\/span><\/p>\n

            \u5b9e\u9645\u5e94\u7528\u793a\u4f8b：\u8bfb\u53d6W25Q64\u95ea\u5b58<\/h4>\n

            \/\/ W25Q64\u547d\u4ee4\u5b9a\u4e49<\/span>
            \n#<\/span>define<\/span> W25Q64_READ_ID<\/span> 0x90<\/span><\/span><\/span>
            \n#<\/span>define<\/span> W25Q64_READ_DATA<\/span> 0x03<\/span><\/span><\/span>
            \n#<\/span>define<\/span> W25Q64_WRITE_ENABLE<\/span> 0x06<\/span><\/span><\/span>
            \n#<\/span>define<\/span> W25Q64_PAGE_PROGRAM<\/span> 0x02<\/span><\/span><\/span>
            \n#<\/span>define<\/span> W25Q64_ERASE_SECTOR<\/span> 0x20<\/span><\/span><\/span>
            \n#<\/span>define<\/span> W25Q64_READ_STATUS<\/span> 0x05<\/span><\/span><\/span><\/p>\n

            \/\/ \u8bfb\u53d6W25Q64\u82af\u7247ID<\/span>
            \nuint16_t<\/span> W25Q64_ReadID<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
            \n uint16_t<\/span> id =<\/span> 0<\/span>;<\/span><\/p>\n

            SPI_CS_L;<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>W25Q64_READ_ID)<\/span>;<\/span> \/\/ \u53d1\u9001\u8bfb\u53d6ID\u547d\u4ee4<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>0x00<\/span>)<\/span>;<\/span> \/\/ \u53d1\u90013\u4e2a\u865a\u62df\u5730\u5740<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>0x00<\/span>)<\/span>;<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>0x00<\/span>)<\/span>;<\/span>
            \n id |=<\/span> SPI_ReadWriteByte<\/span>(<\/span>0xFF<\/span>)<\/span> <<<\/span> 8<\/span>;<\/span> \/\/ \u8bfb\u53d6\u5382\u5546ID<\/span>
            \n id |=<\/span> SPI_ReadWriteByte<\/span>(<\/span>0xFF<\/span>)<\/span>;<\/span> \/\/ \u8bfb\u53d6\u8bbe\u5907ID<\/span>
            \n SPI_CS_H;<\/span><\/p>\n

            return<\/span> id;<\/span>
            \n}<\/span><\/p>\n

            \/\/ \u8bfb\u53d6W25Q64\u72b6\u6001\u5bc4\u5b58\u5668<\/span>
            \nuint8_t<\/span> W25Q64_ReadStatus<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
            \n uint8_t<\/span> status;<\/span>
            \n SPI_CS_L;<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>W25Q64_READ_STATUS)<\/span>;<\/span>
            \n status =<\/span> SPI_ReadWriteByte<\/span>(<\/span>0xFF<\/span>)<\/span>;<\/span>
            \n SPI_CS_H;<\/span>
            \n return<\/span> status;<\/span>
            \n}<\/span><\/p>\n

            \/\/ \u7b49\u5f85W25Q64\u64cd\u4f5c\u5b8c\u6210<\/span>
            \nvoid<\/span> W25Q64_WaitBusy<\/span>(<\/span>void<\/span>)<\/span> {<\/span>
            \n while<\/span>(<\/span>(<\/span>W25Q64_ReadStatus<\/span>(<\/span>)<\/span> &<\/span> 0x01<\/span>)<\/span> ==<\/span> 0x01<\/span>)<\/span>;<\/span>
            \n}<\/span><\/p>\n

            \/\/ \u8bfb\u53d6W25Q64\u6570\u636e<\/span>
            \nvoid<\/span> W25Q64_ReadData<\/span>(<\/span>uint32_t<\/span> addr,<\/span> uint8_t<\/span> *<\/span>buf,<\/span> uint16_t<\/span> len)<\/span> {<\/span>
            \n SPI_CS_L;<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>W25Q64_READ_DATA)<\/span>;<\/span> \/\/ \u53d1\u9001\u8bfb\u53d6\u547d\u4ee4<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>(<\/span>addr >><\/span> 16<\/span>)<\/span> &<\/span> 0xFF<\/span>)<\/span>;<\/span> \/\/ \u53d1\u9001\u5730\u5740<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>(<\/span>addr >><\/span> 8<\/span>)<\/span> &<\/span> 0xFF<\/span>)<\/span>;<\/span>
            \n SPI_ReadWriteByte<\/span>(<\/span>addr &<\/span> 0xFF<\/span>)<\/span>;<\/span><\/p>\n

            while<\/span>(<\/span>len—<\/span>)<\/span> {<\/span>
            \n *<\/span>buf =<\/span> SPI_ReadWriteByte<\/span>(<\/span>0xFF<\/span>)<\/span>;<\/span>
            \n buf++<\/span>;<\/span>
            \n }<\/span><\/p>\n

            SPI_CS_H;<\/span>
            \n}<\/span><\/p>\n

            \u603b\u7ed3<\/h3>\n

            I2C\u534f\u8bae\u5b9e\u73b0\u8981\u70b9<\/h4>\n
          • \u4f7f\u7528\u5f00\u6f0f\u8f93\u51fa\u6a21\u5f0f\u914d\u7f6eGPIO<\/li>\n
          • \u5b9e\u73b0\u8d77\u59cb\u3001\u505c\u6b62\u3001\u53d1\u9001\u3001\u63a5\u6536\u3001\u5e94\u7b54\u7b49\u57fa\u672c\u4fe1\u53f7\u64cd\u4f5c<\/li>\n
          • \u6309\u7167\u534f\u8bae\u65f6\u5e8f\u7f16\u5199\u8bfb\u5199\u51fd\u6570<\/li>\n
          • \u6ce8\u610f\u65f6\u949f\u901f\u7387\u63a7\u5236\u548c\u65f6\u5e8f\u5ef6\u8fdf<\/li>\n

            SPI\u534f\u8bae\u5b9e\u73b0\u8981\u70b9<\/h4>\n
          • \u914d\u7f6eMOSI\u3001SCK\u4e3a\u8f93\u51fa，MISO\u4e3a\u8f93\u5165<\/li>\n
          • \u786e\u5b9a\u4f7f\u7528\u7684SPI\u6a21\u5f0f（\u65f6\u949f\u6781\u6027\u548c\u76f8\u4f4d）<\/li>\n
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