Lourdès Abou-tayeh / Mbed 2 deprecated Capteur1

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Dependencies:   mbed

BMP280/BMP280.cpp@1:94d75a291f23, 2021-09-06 (annotated)

Committer:
louatayehh
Date:
Mon Sep 06 11:30:37 2021 +0000
Revision:
1:94d75a291f23
Parent:
0:c23b55e3ca7d 
Capteur 1 : BMP280

Who changed what in which revision?

UserRevisionLine numberNew contents of line
louatayehh 1:94d75a291f23 1 //*****************Capteur BMP280 - pression atmosphérique ***************************//
louatayehh 0:c23b55e3ca7d 2
louatayehh 0:c23b55e3ca7d 3 #include "mbed.h"
louatayehh 0:c23b55e3ca7d 4 #include "BMP280.h"
louatayehh 0:c23b55e3ca7d 5
louatayehh 0:c23b55e3ca7d 6 //Constructeur
louatayehh 0:c23b55e3ca7d 7 BMP280::BMP280(PinName sda, PinName scl, char slave_adr)
louatayehh 0:c23b55e3ca7d 8 :
louatayehh 0:c23b55e3ca7d 9 i2c_p(new I2C(sda, scl)),
louatayehh 0:c23b55e3ca7d 10 i2c(*i2c_p),
louatayehh 1:94d75a291f23 11 address(slave_adr<<1), // décalage adresse I2C
louatayehh 0:c23b55e3ca7d 12 t_fine(0)
louatayehh 0:c23b55e3ca7d 13 {
louatayehh 0:c23b55e3ca7d 14 initialize();
louatayehh 0:c23b55e3ca7d 15 }
louatayehh 0:c23b55e3ca7d 16
louatayehh 0:c23b55e3ca7d 17 //Constructeur
louatayehh 0:c23b55e3ca7d 18 BMP280::BMP280(I2C &i2c_obj, char slave_adr)
louatayehh 0:c23b55e3ca7d 19 :
louatayehh 0:c23b55e3ca7d 20 i2c_p(NULL),
louatayehh 0:c23b55e3ca7d 21 i2c(i2c_obj),
louatayehh 0:c23b55e3ca7d 22 address(slave_adr<<1),
louatayehh 0:c23b55e3ca7d 23 t_fine(0)
louatayehh 0:c23b55e3ca7d 24 {
louatayehh 0:c23b55e3ca7d 25 initialize();
louatayehh 0:c23b55e3ca7d 26 }
louatayehh 0:c23b55e3ca7d 27
louatayehh 0:c23b55e3ca7d 28 // Destructeur
louatayehh 0:c23b55e3ca7d 29 BMP280::~BMP280()
louatayehh 0:c23b55e3ca7d 30 {
louatayehh 0:c23b55e3ca7d 31 if (NULL != i2c_p)
louatayehh 0:c23b55e3ca7d 32 delete i2c_p;
louatayehh 0:c23b55e3ca7d 33 }
louatayehh 0:c23b55e3ca7d 34
louatayehh 0:c23b55e3ca7d 35 void BMP280::initialize()
louatayehh 0:c23b55e3ca7d 36 {
louatayehh 0:c23b55e3ca7d 37 char cmd[18];
louatayehh 0:c23b55e3ca7d 38
louatayehh 0:c23b55e3ca7d 39 //cmd[0] = 0xf2; // ctrl_hum
louatayehh 0:c23b55e3ca7d 40 //cmd[1] = 0x01; // suréchantillonage humidité x1
louatayehh 0:c23b55e3ca7d 41 //i2c.write(address, cmd, 2);
louatayehh 0:c23b55e3ca7d 42
louatayehh 0:c23b55e3ca7d 43 cmd[0] = 0xf4; // ctrl_meas
louatayehh 0:c23b55e3ca7d 44 //cmd[1] = 0x27; // suréchantillonage température x1, suréchantillonage pression x1, Mode Normal
louatayehh 0:c23b55e3ca7d 45 cmd[1] = 0b01010111; // suréchantillonage température x2 010, suréchantillonage pression x16 101, Mode Normal 11
louatayehh 0:c23b55e3ca7d 46 i2c.write(address, cmd, 2);
louatayehh 0:c23b55e3ca7d 47
louatayehh 0:c23b55e3ca7d 48 cmd[0] = 0xf5; // config
louatayehh 0:c23b55e3ca7d 49 cmd[1] = 0b10111100; // Période Standby 1000ms, Filtre x16
louatayehh 0:c23b55e3ca7d 50 i2c.write(address, cmd, 2);
louatayehh 0:c23b55e3ca7d 51
louatayehh 0:c23b55e3ca7d 52 cmd[0] = 0x88; // read dig_T regs
louatayehh 0:c23b55e3ca7d 53 i2c.write(address, cmd, 1);
louatayehh 0:c23b55e3ca7d 54 i2c.read(address, cmd, 6);
louatayehh 0:c23b55e3ca7d 55
louatayehh 0:c23b55e3ca7d 56 dig_T1 = (cmd[1] << 8) | cmd[0];
louatayehh 0:c23b55e3ca7d 57 dig_T2 = (cmd[3] << 8) | cmd[2];
louatayehh 0:c23b55e3ca7d 58 dig_T3 = (cmd[5] << 8) | cmd[4];
louatayehh 0:c23b55e3ca7d 59
louatayehh 0:c23b55e3ca7d 60 DEBUG_PRINT("dig_T = 0x%x, 0x%x, 0x%x\n\r", dig_T1, dig_T2, dig_T3);
louatayehh 0:c23b55e3ca7d 61 DEBUG_PRINT("dig_T = %d, %d, %d\n\r", dig_T1, dig_T2, dig_T3);
louatayehh 0:c23b55e3ca7d 62
louatayehh 0:c23b55e3ca7d 63 cmd[0] = 0x8E; // read dig_P regs
louatayehh 0:c23b55e3ca7d 64 i2c.write(address, cmd, 1);
louatayehh 0:c23b55e3ca7d 65 i2c.read(address, cmd, 18);
louatayehh 0:c23b55e3ca7d 66
louatayehh 0:c23b55e3ca7d 67 dig_P1 = (cmd[ 1] << 8) | cmd[ 0];
louatayehh 0:c23b55e3ca7d 68 dig_P2 = (cmd[ 3] << 8) | cmd[ 2];
louatayehh 0:c23b55e3ca7d 69 dig_P3 = (cmd[ 5] << 8) | cmd[ 4];
louatayehh 0:c23b55e3ca7d 70 dig_P4 = (cmd[ 7] << 8) | cmd[ 6];
louatayehh 0:c23b55e3ca7d 71 dig_P5 = (cmd[ 9] << 8) | cmd[ 8];
louatayehh 0:c23b55e3ca7d 72 dig_P6 = (cmd[11] << 8) | cmd[10];
louatayehh 0:c23b55e3ca7d 73 dig_P7 = (cmd[13] << 8) | cmd[12];
louatayehh 0:c23b55e3ca7d 74 dig_P8 = (cmd[15] << 8) | cmd[14];
louatayehh 0:c23b55e3ca7d 75 dig_P9 = (cmd[17] << 8) | cmd[16];
louatayehh 0:c23b55e3ca7d 76
louatayehh 0:c23b55e3ca7d 77 DEBUG_PRINT("dig_P = 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", dig_P1, dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9);
louatayehh 1:94d75a291f23 78 /*
louatayehh 0:c23b55e3ca7d 79 cmd[0] = 0xA1; // read dig_H regs
louatayehh 0:c23b55e3ca7d 80 i2c.write(address, cmd, 1);
louatayehh 0:c23b55e3ca7d 81 i2c.read(address, cmd, 1);
louatayehh 0:c23b55e3ca7d 82 cmd[1] = 0xE1; // read dig_H regs
louatayehh 0:c23b55e3ca7d 83 i2c.write(address, &cmd[1], 1);
louatayehh 0:c23b55e3ca7d 84 i2c.read(address, &cmd[1], 7);
louatayehh 0:c23b55e3ca7d 85
louatayehh 0:c23b55e3ca7d 86 dig_H1 = cmd[0];
louatayehh 0:c23b55e3ca7d 87 dig_H2 = (cmd[2] << 8) | cmd[1];
louatayehh 0:c23b55e3ca7d 88 dig_H3 = cmd[3];
louatayehh 0:c23b55e3ca7d 89 dig_H4 = (cmd[4] << 4) | (cmd[5] & 0x0f);
louatayehh 0:c23b55e3ca7d 90 dig_H5 = (cmd[6] << 4) | ((cmd[5]>>4) & 0x0f);
louatayehh 0:c23b55e3ca7d 91 dig_H6 = cmd[7];
louatayehh 0:c23b55e3ca7d 92
louatayehh 0:c23b55e3ca7d 93 DEBUG_PRINT("dig_H = 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", dig_H1, dig_H2, dig_H3, dig_H4, dig_H5, dig_H6);
louatayehh 1:94d75a291f23 94 */
louatayehh 0:c23b55e3ca7d 95 }
louatayehh 0:c23b55e3ca7d 96
louatayehh 0:c23b55e3ca7d 97 float BMP280::getTemperature()
louatayehh 0:c23b55e3ca7d 98 {
louatayehh 0:c23b55e3ca7d 99 int32_t temp_raw;
louatayehh 0:c23b55e3ca7d 100 float tempf;
louatayehh 0:c23b55e3ca7d 101 char cmd[4];
louatayehh 0:c23b55e3ca7d 102
louatayehh 0:c23b55e3ca7d 103 cmd[0] = 0xfa; // temp_msb
louatayehh 0:c23b55e3ca7d 104 i2c.write(address, cmd, 1);
louatayehh 0:c23b55e3ca7d 105 i2c.read(address, &cmd[1], 3);
louatayehh 0:c23b55e3ca7d 106
louatayehh 0:c23b55e3ca7d 107 temp_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
louatayehh 0:c23b55e3ca7d 108 DEBUG_PRINT("\r\ntemp_raw:%d",temp_raw);
louatayehh 0:c23b55e3ca7d 109
louatayehh 0:c23b55e3ca7d 110 int32_t temp1, temp2,temp;
louatayehh 0:c23b55e3ca7d 111
louatayehh 0:c23b55e3ca7d 112 temp1 =((((temp_raw >> 3) - (dig_T1 << 1))) * dig_T2) >> 11;
louatayehh 0:c23b55e3ca7d 113 temp2 =(((((temp_raw >> 4) - dig_T1) * ((temp_raw >> 4) - dig_T1)) >> 12) * dig_T3) >> 14;
louatayehh 0:c23b55e3ca7d 114 DEBUG_PRINT(" temp1:%d temp2:%d",temp1, temp2);
louatayehh 0:c23b55e3ca7d 115 t_fine = temp1+temp2;
louatayehh 0:c23b55e3ca7d 116 DEBUG_PRINT(" t_fine:%d",t_fine);
louatayehh 0:c23b55e3ca7d 117 temp = (t_fine * 5 + 128) >> 8;
louatayehh 0:c23b55e3ca7d 118 tempf = (float)temp;
louatayehh 0:c23b55e3ca7d 119 DEBUG_PRINT(" tempf:%f",tempf);
louatayehh 0:c23b55e3ca7d 120
louatayehh 0:c23b55e3ca7d 121 return (tempf/100.0f);
louatayehh 0:c23b55e3ca7d 122 }
louatayehh 0:c23b55e3ca7d 123
louatayehh 0:c23b55e3ca7d 124 float BMP280::getPressure()
louatayehh 0:c23b55e3ca7d 125 {
louatayehh 0:c23b55e3ca7d 126 uint32_t press_raw;
louatayehh 0:c23b55e3ca7d 127 float pressf;
louatayehh 0:c23b55e3ca7d 128 char cmd[4];
louatayehh 0:c23b55e3ca7d 129
louatayehh 0:c23b55e3ca7d 130 cmd[0] = 0xf7; // press_msb
louatayehh 0:c23b55e3ca7d 131 i2c.write(address, cmd, 1);
louatayehh 0:c23b55e3ca7d 132 i2c.read(address, &cmd[1], 3);
louatayehh 0:c23b55e3ca7d 133
louatayehh 0:c23b55e3ca7d 134 press_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
louatayehh 0:c23b55e3ca7d 135
louatayehh 0:c23b55e3ca7d 136 int32_t var1, var2;
louatayehh 0:c23b55e3ca7d 137 uint32_t press;
louatayehh 0:c23b55e3ca7d 138
louatayehh 0:c23b55e3ca7d 139 var1 = (t_fine >> 1) - 64000;
louatayehh 0:c23b55e3ca7d 140 var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6;
louatayehh 0:c23b55e3ca7d 141 var2 = var2 + ((var1 * dig_P5) << 1);
louatayehh 0:c23b55e3ca7d 142 var2 = (var2 >> 2) + (dig_P4 << 16);
louatayehh 0:c23b55e3ca7d 143 var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18;
louatayehh 0:c23b55e3ca7d 144 var1 = ((32768 + var1) * dig_P1) >> 15;
louatayehh 0:c23b55e3ca7d 145 if (var1 == 0) {
louatayehh 0:c23b55e3ca7d 146 return 0;
louatayehh 0:c23b55e3ca7d 147 }
louatayehh 0:c23b55e3ca7d 148 press = (((1048576 - press_raw) - (var2 >> 12))) * 3125;
louatayehh 0:c23b55e3ca7d 149 if(press < 0x80000000) {
louatayehh 0:c23b55e3ca7d 150 press = (press << 1) / var1;
louatayehh 0:c23b55e3ca7d 151 } else {
louatayehh 0:c23b55e3ca7d 152 press = (press / var1) * 2;
louatayehh 0:c23b55e3ca7d 153 }
louatayehh 0:c23b55e3ca7d 154 var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12;
louatayehh 0:c23b55e3ca7d 155 var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13;
louatayehh 0:c23b55e3ca7d 156 press = (press + ((var1 + var2 + dig_P7) >> 4));
louatayehh 0:c23b55e3ca7d 157
louatayehh 0:c23b55e3ca7d 158 pressf = (float)press;
louatayehh 0:c23b55e3ca7d 159 return (pressf/100.0f);
louatayehh 0:c23b55e3ca7d 160 }