HMC5883 IIC測試程序 作者： 時間：2016-11-29 來源：網絡 加入技術交流群 掃碼加入和技術大咖面對面交流海量資料庫查詢 收藏 <a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a> <a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a> /**************************************發(fā)送應答信號入口參數:ack (0:ACK 1:NAK)**************************************/void HMC5883_SendACK(bit ack){SDA = ack; //寫應答信號SCL = 1; //拉高時鐘線Delay5us(); //延時SCL = 0; //拉低時鐘線Delay5us(); //延時}/**************************************接收應答信號**************************************/bit HMC5883_RecvACK(){SCL = 1; //拉高時鐘線Delay5us(); //延時CY = SDA; //讀應答信號SCL = 0; //拉低時鐘線Delay5us(); //延時return CY;}/**************************************向IIC總線發(fā)送一個字節(jié)數據**************************************/void HMC5883_SendByte(BYTE dat){BYTE i;for (i=0; i<8; i++) //8位計數器{dat <<= 1; //移出數據的最高位SDA = CY; //送數據口SCL = 1; //拉高時鐘線Delay5us(); //延時SCL = 0; //拉低時鐘線Delay5us(); //延時}HMC5883_RecvACK();}/**************************************從IIC總線接收一個字節(jié)數據**************************************/BYTE HMC5883_RecvByte(){BYTE i;BYTE dat = 0;SDA = 1; //使能內部上拉,準備讀取數據,for (i=0; i<8; i++) //8位計數器{dat <<= 1;SCL = 1; //拉高時鐘線Delay5us(); //延時dat |= SDA; //讀數據 SCL = 0; //拉低時鐘線Delay5us(); //延時}return dat;}//***************************************************void Single_Write_HMC5883(uchar REG_Address,uchar REG_data){HMC5883_Start(); //起始信號HMC5883_SendByte(SlaveAddress); //發(fā)送設備地址+寫信號HMC5883_SendByte(REG_Address); //內部寄存器地址，請參考中文pdf HMC5883_SendByte(REG_data); //內部寄存器數據，請參考中文pdfHMC5883_Stop(); //發(fā)送停止信號}//********單字節(jié)讀取內部寄存器*************************uchar Single_Read_HMC5883(uchar REG_Address){ uchar REG_data;HMC5883_Start(); //起始信號HMC5883_SendByte(SlaveAddress); //發(fā)送設備地址+寫信號HMC5883_SendByte(REG_Address); //發(fā)送存儲單元地址，從0開始 HMC5883_Start(); //起始信號HMC5883_SendByte(SlaveAddress+1); //發(fā)送設備地址+讀信號REG_data=HMC5883_RecvByte(); //讀出寄存器數據HMC5883_SendACK(1); HMC5883_Stop(); //停止信號return REG_data; }//******************************************************////連續(xù)讀出HMC5883內部角度數據，地址范圍0x3~0x5////******************************************************void Multiple_read_HMC5883(void){ uchar i;HMC5883_Start(); //起始信號HMC5883_SendByte(SlaveAddress); //發(fā)送設備地址+寫信號HMC5883_SendByte(0x03); //發(fā)送存儲單元地址，從0x3開始 HMC5883_Start(); //起始信號HMC5883_SendByte(SlaveAddress+1); //發(fā)送設備地址+讀信號for (i=0; i<6; i++) //連續(xù)讀取6個地址數據，存儲中BUF{BUF[i] = HMC5883_RecvByte(); //BUF[0]存儲數據if (i == 5){HMC5883_SendACK(1); //最后一個數據需要回NOACK}else{HMC5883_SendACK(0); //回應ACK}}HMC5883_Stop(); //停止信號Delay5ms();}//初始化HMC5883，根據需要請參考pdf進行修改****void Init_HMC5883(){Single_Write_HMC5883(0x02,0x00); //}//*********************************************************//主程序********//*********************************************************void main(){ // bit sign_bit;unsigned int i;int x,y,z;double angle;delay(500); InitLcd();Init_HMC5883();while(1) //循環(huán){ Multiple_Read_HMC5883(); //連續(xù)讀出數據，存儲在BUF中//---------顯示X軸x=BUF[0] << 8 | BUF[1]; //Combine MSB and LSB of X Data output registerz=BUF[2] << 8 | BUF[3]; //Combine MSB and LSB of Z Data output registery=BUF[4] << 8 | BUF[5]; //Combine MSB and LSB of Y Data output registerangle= atan2((double)y,(double)x) * (180 / 3.14159265) + 180; // angle in degreesangle*=10;conversion(angle); //計算數據和顯示DisplayOneChar(2,0,A); DisplayOneChar(3,0,:); DisplayOneChar(4,0,qian); DisplayOneChar(5,0,bai); DisplayOneChar(6,0,shi); DisplayOneChar(7,0,.); DisplayOneChar(8,0,ge); for (i=0;i<10000;i++); //延時 }} 上一頁 1 2 下一頁
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