/*向ADXL345下发指令，指令格式均为1个字节*/void WriteByteToADXL345(I2C_TypeDef* I2Cx,uint8_t deviceAddress,uint8_t command){uint16_t i2cTimeout=TimeoutPeriod;/*产生I2C起始信号*/I2C_GenerateSTART(I2C2, ENABLE);/*检测 EV5 事件并清除标志*/while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT)){if ((i2cTimeout--) == 0) return ;}/*发送ADXL345的地址*/I2C_Send7bitAddress(I2Cx,deviceAddress,I2C_Direction_Transmitter);i2cTimeout=TimeoutPeriod;/*检测 EV6 事件并清除标志*/while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){if ((i2cTimeout--) == 0) return ;}/*下发操作命令*/I2C_SendData(I2Cx, command);i2cTimeout=TimeoutPeriod;/*检测 EV8 事件并清除标志*/while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED)){if ((i2cTimeout--) == 0) return ;}/* 产生I2C停止信号 */I2C_GenerateSTOP(I2Cx, ENABLE);}/*从ADXL345读取多个字节数据的值*/void ReadBytesFromADXL345(I2C_TypeDef* I2Cx,uint8_t deviceAddress,uint8_t *pData,uint16_t bytesNum){uint16_t i2cTimeout=TimeoutPeriod;/*如果I2C总线忙，则等待一段时间*/while (I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY)){if ((i2cTimeout--) == 0) return ;}/* 产生 I2C 起始信号 */I2C_GenerateSTART(I2Cx, ENABLE);/*检测 EV5 事件并清除标志*/while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT)){if ((i2cTimeout--) == 0) return ;}/*发送ADXL345的地址*/I2C_Send7bitAddress(I2Cx,deviceAddress,I2C_Direction_Receiver);i2cTimeout=TimeoutPeriod;/*检测 EV6 事件并清除标志*/while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)){if ((i2cTimeout--) == 0) return ;}while(bytesNum){if(bytesNum==1){I2C_AcknowledgeConfig(I2Cx, DISABLE);//关闭应答
I2C_GenerateSTOP(I2Cx, ENABLE);//停止信号
}i2cTimeout=TimeoutPeriod;/*检测 EV7 事件并清除标志*/while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED)){if ((i2cTimeout--) == 0) return ;}/*通过 I2C，从设备中读取一个字节的数据 */*pData=I2C_ReceiveData(I2Cx);pData++;bytesNum--;}/*使能应答，方便下一次 I2C 传输*/I2C_AcknowledgeConfig(I2Cx, ENABLE);}

void ADXL345_Init_Configuration(void)
{uint8_t devid = 0, val = 0;Delayus (300);ReadByteFromADXL345 (ADXL345_ADDRESS, 0x00, &devid);                //获取设备ID
Delayus (300);val = 0x2B;WriteByteToADXL345 (ADXL345_ADDRESS, DATA_FORMAT_REG, &val);   //数据格式控制
Delayus(50);val = 0x0A;WriteByteToADXL345 (ADXL345_ADDRESS, BW_RATE, &val);                //数据速率及功率模式控制
Delayus(50);val = 0x28;WriteByteToADXL345 (ADXL345_ADDRESS, POWER_CTL, &val);           //上电特性控制
Delayus(50);val = 0;WriteByteToADXL345 (ADXL345_ADDRESS, INT_ENABLE, &val);        //中断使能控制
Delayus(50);WriteByteToADXL345 (ADXL345_ADDRESS, OFSX, &val);                      //X轴偏移
Delayus(50);WriteByteToADXL345 (ADXL345_ADDRESS, OFSY, &val);                       //Y轴偏移
Delayus(50);WriteByteToADXL345 (ADXL345_ADDRESS, OFSZ, &val);                       //Z轴偏移
Delayus(500);
}

void GetValue FromADXL345 (void)
{unsigned char devid = 0;unsigned char dataTemp[6];Delayus(200);ReadByteFromADXL345(ADXL345_ADDRESS, 0x00, &devid);                                     //读取设备ID
Delayus(200);ReadBytes FromADXL345 (ADXL345_ADDRESS, 0x32, dataTemp, 6);                                   //获取原始数据(4mg/LSB)
adxlInfo.incidence_X = (short)(dataTemp[0] + ((unsigned short)dataTemp[1] << 8));adxlInfo.incidence_Y = (short)(dataTemp[2] + ((unsigned short)dataTemp[3] << 8));adxlInfo.incidence_Z = (short)(dataTemp[4] + ((unsigned short)dataTemp[5] << 8));adxlInfo.incidence_Xf = (float)adxlInfo.incidence_X * 0.0039;          //换算为物理量值
adxlInfo.incidence_Yf = (float)adxlInfo.incidence_Y * 0.0039;          //换算为物理量值
adxlInfo.incidence_Zf = (float)adxlInfo.incidence_Z * 0.0039;           //换算为物理量值
}