Diff: BMP280.cpp

Revision:

0:54d7f18450e6

Child:

1:a65c7f637b1e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BMP280.cpp	Sun Dec 04 14:38:21 2016 +0000
@@ -0,0 +1,131 @@
+#include "BMP280.h"
+
+
+BMP280::BMP280(PinName mosi,PinName miso,PinName sck,PinName _cs):bmp(mosi,miso,sck),cs(_cs)
+{
+    cs=1;
+    bmp.frequency(1000000);
+    bmp.format(8,3);
+    
+    wait(0.1);
+    press=0;
+    
+    writebyte(0xe0,0xb6);//reset
+    wait_ms(100);
+    
+    char buf[2];
+    while((readbyte(0xf3)&0b00000001));
+    
+    readnbyte(0x88,buf,2);
+    dig_T1=((unsigned short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x8a,buf,2);
+    dig_T2=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x8c,buf,2);
+    dig_T3=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x8e,buf,2);
+    dig_P1=((unsigned short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x90,buf,2);
+    dig_P2=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x92,buf,2);
+    dig_P3=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x94,buf,2);
+    dig_P4=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x96,buf,2);
+    dig_P5=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x98,buf,2);
+    dig_P6=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x9a,buf,2);
+    dig_P7=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x9c,buf,2);
+    dig_P8=((short)(buf[1]<<8)|buf[0]);
+    readnbyte(0x9e,buf,2);
+    dig_P9=((short)(buf[1]<<8)|buf[0]);
+
+}
+
+void BMP280::init(char t_osr,char p_osr,char t_sb,char IIR){
+    char data=((t_osr<<5)|(p_osr<<2))|0b11;
+    writebyte(0xf4,data);//config
+    
+    data=0;
+    data=(t_sb<<5)|(IIR<<2);
+    writebyte(0xf5,data);
+}
+
+char BMP280::readbyte(char adr){
+    cs=0;
+    bmp.write(adr|0b10000000);
+    char val=bmp.write(0xff);
+    cs=1;
+    return val;
+    
+}
+void BMP280::writebyte(char adr,char data){
+    cs=0;
+    bmp.write(adr&0b1111111);
+    bmp.write(data);
+    cs=1;
+}
+void BMP280::readnbyte(char adr,char *data,char num){
+    cs=0;
+    bmp.write(adr|0b10000000);
+    for(int i=0;i<num;i++)data[i]=bmp.write(0xff);
+    cs=1;
+}
+
+int BMP280::bmp280_compensate_T_int32(int adc_T){
+    int var1,var2,T;
+    var1=((((adc_T>>3)-((int)dig_T1<<1)))*((int)dig_T2))>>11;
+    var2=(((((adc_T>>4)-((int)dig_T1))*((adc_T>>4)-((int)dig_T1)))>>12)*((int)dig_T3))>>14;
+    t_fine=var1+var2;
+    T=(t_fine*5+128)>>8;
+    return T;
+    
+}
+unsigned int BMP280::bmp280_compensate_P_int64(int adc_P){
+    int32_t var1, var2;
+    unsigned int press=0;
+ 
+    var1 = (t_fine >> 1) - 64000;
+    var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6;
+    var2 = var2 + ((var1 * dig_P5) << 1);
+    var2 = (var2 >> 2) + (dig_P4 << 16);
+    var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18;
+    var1 = ((32768 + var1) * dig_P1) >> 15;
+    if (var1 == 0) {
+        return 0;
+    }
+    press = (((1048576 - adc_P) - (var2 >> 12))) * 3125;
+    if(press < 0x80000000) {
+        press = (press << 1) / var1;
+    } else {
+        press = (press / var1) * 2;
+    }
+    var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12;
+    var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13;
+    press = (press + ((var1 + var2 + dig_P7) >> 4));
+    
+    return press;
+}
+bool BMP280::update(){
+    if(((readbyte(0xf3)&0b00001000)>>3)==0){//データが見れるか
+    
+    char data[6];
+    int adc_T,adc_P;
+    readnbyte(0xf7,data,6);
+    adc_T=(int)((data[4]<<4)|(data[3]<<12))|(data[5]>>4);
+    
+    adc_P=(int)((data[2]>>4)|(data[1]<<4))|(data[0]<<12);
+    
+    bmp280_compensate_T_int32(adc_T);
+    press=bmp280_compensate_P_int64(adc_P);
+
+    return true;
+    }
+    
+return false;
+}
+
+float BMP280::getpress(){
+    return (float)press;
+}
\ No newline at end of file