51单片机bmp280测试程序，实机测试通过，bmp280+lcd1602显示气压和温度值。压缩包附件中包含测试程序和详细的资料。
测试程序使用的单片机型号是STC90C516RD+,1280字节RAM，64K ROM,12Mhz晶振
单片机源程序如下:
- #include"bmp280.h"
- unsigned short xdata dig_t1,dig_p1; //注意数据类型
- signed short xdata dig_t2,dig_t3,dig_p2,dig_p3,dig_p4,dig_p5,dig_p6,dig_p7,dig_p8,dig_p9;
- long signed int xdata bmp280_ut,bmp280_up;
- long signed int xdata t_fine;
- void bmpreaddata() //原始压力温度数据突发读取
- {
- uchar xdata n,temp=0x09,address=0xf7;
- long unsigned int xdata readdata0[6]; //注意数据类型
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(0xf4,1);
- i2csendbyte(0x55,1);
- i2cstop();
- delay10ms(10);
- while(temp!=0)
- {
- temp=0x09;
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(0xf3,1);
- i2cstop();
- i2cstart();
- i2csendbyte(0xed,1);
- temp&=i2creadbyte(1);
- i2cstop();
- }
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(address,1);
- i2cstop();
- i2cstart();
- i2csendbyte(0xed,1);
- for(n=0;n<6;n++)
- {
- if(n<5)
- {
- readdata0[n]=i2creadbyte(0);
- }
- else
- {
- readdata0[n]=i2creadbyte(1);
- }
- }
- i2cstop();
- bmp280_up=(readdata0[0]<<12)|(readdata0[1]<<4)|(readdata0[2]>>4);
- bmp280_ut=(readdata0[3]<<12)|(readdata0[4]<<4)|(readdata0[5]>>4);
- }
- void bmpreset()
- {
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(0xe0,1);
- i2csendbyte(0xb6,1); //软复位
- i2cstop();
- }
- void bmpconfig()
- {
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(0xf5,1);
- i2csendbyte(0x00,1); //强制模式无待机时间，关滤波，禁用3线模式
- i2cstop();
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(0xf4,1);
- i2csendbyte(0x55,1); //压力16倍，温度2倍过采样，转换时间最大43MS，强制模式
- i2cstop();
- }
- void readtrimming() //补偿参数单字节读取
- {
- uchar xdata n,address=0x88;
- uchar xdata readdata[24];
- for(n=0;n<24;n++)
- {
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(address,1);
- i2cstop();
- i2cstart();
- i2csendbyte(0xed,1);
- if(n<23)
- {
- readdata[n]=i2creadbyte(0);
- }
- else
- {
- readdata[n]=i2creadbyte(1);
- }
- i2cstop();
- address++;
- }
- dig_t1=(readdata[1]<<8)|(readdata[0]);
- dig_t2=(readdata[3]<<8)|(readdata[2]);
- dig_t3=(readdata[5]<<8)|(readdata[4]);
- dig_p1=(readdata[7]<<8)|(readdata[6]);
- dig_p2=(readdata[9]<<8)|(readdata[8]);
- dig_p3=(readdata[11]<<8)|(readdata[10]);
- dig_p4=(readdata[13]<<8)|(readdata[12]);
- dig_p5=(readdata[15]<<8)|(readdata[14]);
- dig_p6=(readdata[17]<<8)|(readdata[16]);
- dig_p7=(readdata[19]<<8)|(readdata[18]);
- dig_p8=(readdata[21]<<8)|(readdata[20]);
- dig_p9=(readdata[23]<<8)|(readdata[22]);
- }
- uchar bmpid()
- {
- uchar xdata id;
- i2cstart();
- i2csendbyte(0xec,1);
- i2csendbyte(0xd0,1);
- i2cstop();
- i2cstart();
- i2csendbyte(0xed,1);
- id=i2creadbyte(1);
- i2cstop();
- return id;
- }
- long signed int tempcal(long signed int adc_t) //c51单片机不支持64位整数，使用简化计算
- {
- long signed int var1,var2,t;
- var1=((((adc_t>>3)-((long signed int)dig_t1<<1)))*((long signed int)dig_t2))>>11;
- var2=(((((adc_t>>4)-((long signed int)dig_t1))*((adc_t>>4)-((long signed int)dig_t1)))>>12)*((long signed int)dig_t3))>>14;
- t_fine=var1+var2;
- t=(t_fine*5+128)>>8;
- return t;
- }
- long unsigned int presscal(long signed int adc_p)
- {
- long signed int var1,var2;
- long unsigned int p;
- var1=(((long signed int)t_fine)>>1)-(long signed int)64000;
- var2=(((var1>>2)*(var1>>2))>>11)*((long signed int)dig_p6);
- var2=var2+((var1*((long signed int)dig_p5))<<1);
- var2=(var2>>2)+(((long signed int)dig_p4)<<16);
- var1=(((dig_p3*(((var1>>2)*(var1>>2))>>13))>>3)+((((long signed int)dig_p2)*var1)>>1))>>18;
- var1=((((32768+var1))*((long signed int)dig_p1))>>15);
- if(var1==0)
- {
- return 0;
- }
- p=(((long unsigned int)(((long signed int)1048576)-adc_p)-(var2>>12)))*3125;
- if(p<0x80000000)
- ……………………
- …………限于本文篇幅 余下代码请从51黑下载附件…………
所有资料51hei提供下载:
bmp280.zip
(5.18 MB, 下载次数: 601)
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