HMC5883L 测试程序

** 协议：IIC 详细读写协议，请参考相关资料 ** 时间：2012.2.2 ** Author:Keliwen

**************************************************/ #include #include #include #include

typedef unsigned char uchar; typedef unsigned int uint;

/*12232液晶引脚定义*/ sbit CS=P0^2; sbit SID=P0^1; sbit SCLK=P0^0;

sbit SCL=P1^0; //IIC时钟引脚定义 sbit SDA=P1^1; //IIC数据引脚定义

#define SlaveAddress 0x3c //定义器件在IIC总线中的从地址 uchar Rec_Data[6];

/*延时函数*/ void Delay(uint t) {

while(t--) {} }

/******************************************** **LCD显示函数

********************************************/ /*写入一个数据或指令*/

void Send_DATA(uchar Data,uchar A) {

uchar i,Dat; CS=0; switch(A) {

case 0 : Dat=0xf8; break;//写指令

case 1 : Dat=0xfa; break;//写数据 default : break; }

SCLK=0; CS=1;

for(i=0;i<8;i++) {

SID=Dat&0x80; SCLK=0; SCLK=1; Dat<<=1; }

Dat=Data&0xf0; for(i=0;i<8;i++) {

SID=Dat&0x80; SCLK=0; SCLK=1; Dat<<=1; }

Dat=(Data<<4); for(i=0;i<8;i++) {

SID=Dat&0x80; SCLK=0; SCLK=1; Dat<<=1; } CS=0;

Delay(20); }

/*12232液晶初始化*/ void LCD_Init(void) {

Delay(60000);

Send_DATA(0x02,0); Send_DATA(0x0c,0); Send_DATA(0x30,0); Send_DATA(0x06,0); Send_DATA(0x01,0); Delay(3000); }

/*显示字符串*/

void Dis_str(uchar Addr,uchar *str)

{

Send_DATA(Addr,0); Delay(10);

while(*str!='\\0') {

Send_DATA(*str,1); str++; Delay(10); } }

/*起始信号*/

void IIC_Start(void) {

SDA=1; SCL=1; Delay(5); SDA=0; Delay(5); SCL=0; }

/*停止信号*/

void IIC_Stop(void) {

SDA=0; SCL=1; Delay(5); SDA=1; Delay(5); }

/*发送应答信号*/

void IIC_SendAck(bit Ack) {

SDA=Ack;//ack (0:ACK 1:NACK) SCL=1; Delay(5); SCL=0; Delay(5); }

/*接收应答信号*/ bit IIC_RecAck(void) {

SCL=1; Delay(5); CY=SDA;

SCL=0; Delay(5); return CY; }

/*向IIC总线发送一个字节数据*/ void HMC5883_Send_Byte(uchar Dat) {

uchar i;

for(i=0;i<8;i++) {

Dat<<=1; SDA=CY; SCL=1; Delay(5); SCL=0; Delay(5); }

IIC_RecAck(); }

/*从IIC总线接收一个字节数据*/ uchar HMC5883_Rec_Byte(void) {

uchar i,Dat=0; SDA=1;

for(i=0;i<8;i++) {

Dat<<=1; SCL=1; Delay(5); Dat |=SDA; SCL=0; Delay(5); }

return Dat; }

/*单字节写HMC5833*/

void Single_Write_HMC5883(uchar Address,uchar Dat) {

IIC_Start();

HMC5883_Send_Byte(SlaveAddress); HMC5883_Send_Byte(Address); HMC5883_Send_Byte(Dat); IIC_Stop(); }

/*单字节读HMC5833*/

/*uchar Single_Read_HMC5883(uchar Addr) {

uchar Value; IIC_Start();

HMC5883_Send_Byte(SlaveAddress); HMC5883_Send_Byte(Addr); IIC_Start();

HMC5883_Send_Byte(SlaveAddress+1); Value=HMC5883_Rec_Byte(); IIC_SendAck(1); IIC_Stop(); return Value; }*/

/*多字节读HMC5833*/

void Multiple_Read_HMC5883(void) {

uchar i; //连续读出HMC5883内部角度数据，地址范围0x3~0x5 IIC_Start();

HMC5883_Send_Byte(SlaveAddress);

HMC5883_Send_Byte(0x03);//发送存储单元地址，从0x03开始 IIC_Start();

HMC5883_Send_Byte(SlaveAddress+1);

for(i=0;i<6;i++) //连续读取6个地址数据，存储在Rec_Data {

Rec_Data[i]=HMC5883_Rec_Byte(); if(i==5)

IIC_SendAck(1); //最后一个数据需要回NOACK else

IIC_SendAck(0); //回应ACK }

IIC_Stop(); Delay(100); }

//初始化HMC5883，根据需要请参考pdf进行修改**** void HMC5883_Init(void) {

Single_Write_HMC5883(0x02,0x00); }

/*主函数*/ void main(void) {

int X,Y,Z; double Angle;

uint Acr;

LCD_Init();//LCD12232液晶初始化 Dis_str(0x80,\"3 轴数字罗盘\");

HMC5883_Init();//HMC5883初始化

do {

Multiple_Read_HMC5883();//连续读出数据，存储在Rec_Data[]中

X=Rec_Data[0]<<8 | Rec_Data[1];//Combine MSB and LSB of X Data output register Z=Rec_Data[2]<<8 | Rec_Data[3];//Combine MSB and LSB of Z Data output register Y=Rec_Data[4]<<8 | Rec_Data[5];//Combine MSB and LSB of Y Data output register Angle= atan2((double)Y,(double)X)*(180/3.14159265)+180;//单位：角度 (0~360) Angle*=10;

Acr=(uint)Angle;

Send_DATA(0x92,0);

Send_DATA(Acr%10000/1000+0x30,1); Send_DATA(Acr%1000/100+0x30,1); Send_DATA(Acr%100/10+0x30,1); Send_DATA('.',1);

Send_DATA(Acr%10+0x30,1);

Delay(50000); }

while(1); }