BMP280から気圧データを取得します。updateで更新動作、getpressで値を読み出します
BMP280.cpp@0:54d7f18450e6, 2016-12-04 (annotated)
- Committer:
- kim1212
- Date:
- Sun Dec 04 14:38:21 2016 +0000
- Revision:
- 0:54d7f18450e6
- Child:
- 1:a65c7f637b1e
BMP280??????????????????????????
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kim1212 | 0:54d7f18450e6 | 1 | #include "BMP280.h" |
kim1212 | 0:54d7f18450e6 | 2 | |
kim1212 | 0:54d7f18450e6 | 3 | |
kim1212 | 0:54d7f18450e6 | 4 | BMP280::BMP280(PinName mosi,PinName miso,PinName sck,PinName _cs):bmp(mosi,miso,sck),cs(_cs) |
kim1212 | 0:54d7f18450e6 | 5 | { |
kim1212 | 0:54d7f18450e6 | 6 | cs=1; |
kim1212 | 0:54d7f18450e6 | 7 | bmp.frequency(1000000); |
kim1212 | 0:54d7f18450e6 | 8 | bmp.format(8,3); |
kim1212 | 0:54d7f18450e6 | 9 | |
kim1212 | 0:54d7f18450e6 | 10 | wait(0.1); |
kim1212 | 0:54d7f18450e6 | 11 | press=0; |
kim1212 | 0:54d7f18450e6 | 12 | |
kim1212 | 0:54d7f18450e6 | 13 | writebyte(0xe0,0xb6);//reset |
kim1212 | 0:54d7f18450e6 | 14 | wait_ms(100); |
kim1212 | 0:54d7f18450e6 | 15 | |
kim1212 | 0:54d7f18450e6 | 16 | char buf[2]; |
kim1212 | 0:54d7f18450e6 | 17 | while((readbyte(0xf3)&0b00000001)); |
kim1212 | 0:54d7f18450e6 | 18 | |
kim1212 | 0:54d7f18450e6 | 19 | readnbyte(0x88,buf,2); |
kim1212 | 0:54d7f18450e6 | 20 | dig_T1=((unsigned short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 21 | readnbyte(0x8a,buf,2); |
kim1212 | 0:54d7f18450e6 | 22 | dig_T2=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 23 | readnbyte(0x8c,buf,2); |
kim1212 | 0:54d7f18450e6 | 24 | dig_T3=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 25 | readnbyte(0x8e,buf,2); |
kim1212 | 0:54d7f18450e6 | 26 | dig_P1=((unsigned short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 27 | readnbyte(0x90,buf,2); |
kim1212 | 0:54d7f18450e6 | 28 | dig_P2=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 29 | readnbyte(0x92,buf,2); |
kim1212 | 0:54d7f18450e6 | 30 | dig_P3=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 31 | readnbyte(0x94,buf,2); |
kim1212 | 0:54d7f18450e6 | 32 | dig_P4=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 33 | readnbyte(0x96,buf,2); |
kim1212 | 0:54d7f18450e6 | 34 | dig_P5=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 35 | readnbyte(0x98,buf,2); |
kim1212 | 0:54d7f18450e6 | 36 | dig_P6=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 37 | readnbyte(0x9a,buf,2); |
kim1212 | 0:54d7f18450e6 | 38 | dig_P7=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 39 | readnbyte(0x9c,buf,2); |
kim1212 | 0:54d7f18450e6 | 40 | dig_P8=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 41 | readnbyte(0x9e,buf,2); |
kim1212 | 0:54d7f18450e6 | 42 | dig_P9=((short)(buf[1]<<8)|buf[0]); |
kim1212 | 0:54d7f18450e6 | 43 | |
kim1212 | 0:54d7f18450e6 | 44 | } |
kim1212 | 0:54d7f18450e6 | 45 | |
kim1212 | 0:54d7f18450e6 | 46 | void BMP280::init(char t_osr,char p_osr,char t_sb,char IIR){ |
kim1212 | 0:54d7f18450e6 | 47 | char data=((t_osr<<5)|(p_osr<<2))|0b11; |
kim1212 | 0:54d7f18450e6 | 48 | writebyte(0xf4,data);//config |
kim1212 | 0:54d7f18450e6 | 49 | |
kim1212 | 0:54d7f18450e6 | 50 | data=0; |
kim1212 | 0:54d7f18450e6 | 51 | data=(t_sb<<5)|(IIR<<2); |
kim1212 | 0:54d7f18450e6 | 52 | writebyte(0xf5,data); |
kim1212 | 0:54d7f18450e6 | 53 | } |
kim1212 | 0:54d7f18450e6 | 54 | |
kim1212 | 0:54d7f18450e6 | 55 | char BMP280::readbyte(char adr){ |
kim1212 | 0:54d7f18450e6 | 56 | cs=0; |
kim1212 | 0:54d7f18450e6 | 57 | bmp.write(adr|0b10000000); |
kim1212 | 0:54d7f18450e6 | 58 | char val=bmp.write(0xff); |
kim1212 | 0:54d7f18450e6 | 59 | cs=1; |
kim1212 | 0:54d7f18450e6 | 60 | return val; |
kim1212 | 0:54d7f18450e6 | 61 | |
kim1212 | 0:54d7f18450e6 | 62 | } |
kim1212 | 0:54d7f18450e6 | 63 | void BMP280::writebyte(char adr,char data){ |
kim1212 | 0:54d7f18450e6 | 64 | cs=0; |
kim1212 | 0:54d7f18450e6 | 65 | bmp.write(adr&0b1111111); |
kim1212 | 0:54d7f18450e6 | 66 | bmp.write(data); |
kim1212 | 0:54d7f18450e6 | 67 | cs=1; |
kim1212 | 0:54d7f18450e6 | 68 | } |
kim1212 | 0:54d7f18450e6 | 69 | void BMP280::readnbyte(char adr,char *data,char num){ |
kim1212 | 0:54d7f18450e6 | 70 | cs=0; |
kim1212 | 0:54d7f18450e6 | 71 | bmp.write(adr|0b10000000); |
kim1212 | 0:54d7f18450e6 | 72 | for(int i=0;i<num;i++)data[i]=bmp.write(0xff); |
kim1212 | 0:54d7f18450e6 | 73 | cs=1; |
kim1212 | 0:54d7f18450e6 | 74 | } |
kim1212 | 0:54d7f18450e6 | 75 | |
kim1212 | 0:54d7f18450e6 | 76 | int BMP280::bmp280_compensate_T_int32(int adc_T){ |
kim1212 | 0:54d7f18450e6 | 77 | int var1,var2,T; |
kim1212 | 0:54d7f18450e6 | 78 | var1=((((adc_T>>3)-((int)dig_T1<<1)))*((int)dig_T2))>>11; |
kim1212 | 0:54d7f18450e6 | 79 | var2=(((((adc_T>>4)-((int)dig_T1))*((adc_T>>4)-((int)dig_T1)))>>12)*((int)dig_T3))>>14; |
kim1212 | 0:54d7f18450e6 | 80 | t_fine=var1+var2; |
kim1212 | 0:54d7f18450e6 | 81 | T=(t_fine*5+128)>>8; |
kim1212 | 0:54d7f18450e6 | 82 | return T; |
kim1212 | 0:54d7f18450e6 | 83 | |
kim1212 | 0:54d7f18450e6 | 84 | } |
kim1212 | 0:54d7f18450e6 | 85 | unsigned int BMP280::bmp280_compensate_P_int64(int adc_P){ |
kim1212 | 0:54d7f18450e6 | 86 | int32_t var1, var2; |
kim1212 | 0:54d7f18450e6 | 87 | unsigned int press=0; |
kim1212 | 0:54d7f18450e6 | 88 | |
kim1212 | 0:54d7f18450e6 | 89 | var1 = (t_fine >> 1) - 64000; |
kim1212 | 0:54d7f18450e6 | 90 | var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6; |
kim1212 | 0:54d7f18450e6 | 91 | var2 = var2 + ((var1 * dig_P5) << 1); |
kim1212 | 0:54d7f18450e6 | 92 | var2 = (var2 >> 2) + (dig_P4 << 16); |
kim1212 | 0:54d7f18450e6 | 93 | var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18; |
kim1212 | 0:54d7f18450e6 | 94 | var1 = ((32768 + var1) * dig_P1) >> 15; |
kim1212 | 0:54d7f18450e6 | 95 | if (var1 == 0) { |
kim1212 | 0:54d7f18450e6 | 96 | return 0; |
kim1212 | 0:54d7f18450e6 | 97 | } |
kim1212 | 0:54d7f18450e6 | 98 | press = (((1048576 - adc_P) - (var2 >> 12))) * 3125; |
kim1212 | 0:54d7f18450e6 | 99 | if(press < 0x80000000) { |
kim1212 | 0:54d7f18450e6 | 100 | press = (press << 1) / var1; |
kim1212 | 0:54d7f18450e6 | 101 | } else { |
kim1212 | 0:54d7f18450e6 | 102 | press = (press / var1) * 2; |
kim1212 | 0:54d7f18450e6 | 103 | } |
kim1212 | 0:54d7f18450e6 | 104 | var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12; |
kim1212 | 0:54d7f18450e6 | 105 | var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13; |
kim1212 | 0:54d7f18450e6 | 106 | press = (press + ((var1 + var2 + dig_P7) >> 4)); |
kim1212 | 0:54d7f18450e6 | 107 | |
kim1212 | 0:54d7f18450e6 | 108 | return press; |
kim1212 | 0:54d7f18450e6 | 109 | } |
kim1212 | 0:54d7f18450e6 | 110 | bool BMP280::update(){ |
kim1212 | 0:54d7f18450e6 | 111 | if(((readbyte(0xf3)&0b00001000)>>3)==0){//データが見れるか |
kim1212 | 0:54d7f18450e6 | 112 | |
kim1212 | 0:54d7f18450e6 | 113 | char data[6]; |
kim1212 | 0:54d7f18450e6 | 114 | int adc_T,adc_P; |
kim1212 | 0:54d7f18450e6 | 115 | readnbyte(0xf7,data,6); |
kim1212 | 0:54d7f18450e6 | 116 | adc_T=(int)((data[4]<<4)|(data[3]<<12))|(data[5]>>4); |
kim1212 | 0:54d7f18450e6 | 117 | |
kim1212 | 0:54d7f18450e6 | 118 | adc_P=(int)((data[2]>>4)|(data[1]<<4))|(data[0]<<12); |
kim1212 | 0:54d7f18450e6 | 119 | |
kim1212 | 0:54d7f18450e6 | 120 | bmp280_compensate_T_int32(adc_T); |
kim1212 | 0:54d7f18450e6 | 121 | press=bmp280_compensate_P_int64(adc_P); |
kim1212 | 0:54d7f18450e6 | 122 | |
kim1212 | 0:54d7f18450e6 | 123 | return true; |
kim1212 | 0:54d7f18450e6 | 124 | } |
kim1212 | 0:54d7f18450e6 | 125 | |
kim1212 | 0:54d7f18450e6 | 126 | return false; |
kim1212 | 0:54d7f18450e6 | 127 | } |
kim1212 | 0:54d7f18450e6 | 128 | |
kim1212 | 0:54d7f18450e6 | 129 | float BMP280::getpress(){ |
kim1212 | 0:54d7f18450e6 | 130 | return (float)press; |
kim1212 | 0:54d7f18450e6 | 131 | } |