Luis Amell / MLX90614

Added the functions to read and set the emissivity of the sensor.

mlx90614.cpp@5:3c4431224932, 2020-05-11 (annotated)

Committer:
lamell
Date:
Mon May 11 17:28:37 2020 +0000
Revision:
5:3c4431224932
Parent:
2:01d333d06727
Child:
6:689f0dab386c
Added the functions to Read the Emissivity and Set Emissivity

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aquahika 1:4a60d3f1e91e 1
aquahika 1:4a60d3f1e91e 2 #include "mlx90614.h"
aquahika 1:4a60d3f1e91e 3
aquahika 2:01d333d06727 4
aquahika 2:01d333d06727 5
aquahika 2:01d333d06727 6
aquahika 1:4a60d3f1e91e 7 MLX90614::MLX90614(I2C* i2c,int addr){
aquahika 1:4a60d3f1e91e 8
aquahika 1:4a60d3f1e91e 9 this->i2caddress = addr;
aquahika 1:4a60d3f1e91e 10 this->i2c = i2c;
aquahika 1:4a60d3f1e91e 11
aquahika 1:4a60d3f1e91e 12 }
aquahika 1:4a60d3f1e91e 13
aquahika 1:4a60d3f1e91e 14
aquahika 1:4a60d3f1e91e 15 bool MLX90614::getTemp(float* temp_val){
aquahika 1:4a60d3f1e91e 16
aquahika 1:4a60d3f1e91e 17 char p1,p2,p3;
aquahika 1:4a60d3f1e91e 18 float temp_thermo;
aquahika 1:4a60d3f1e91e 19 bool ch;
aquahika 1:4a60d3f1e91e 20
aquahika 1:4a60d3f1e91e 21 i2c->stop(); //stop i2c if not ack
aquahika 1:4a60d3f1e91e 22 wait(0.01);
aquahika 1:4a60d3f1e91e 23 i2c->start(); //start I2C
aquahika 1:4a60d3f1e91e 24 ch=i2c->write(i2caddress); //device address with write condition
aquahika 1:4a60d3f1e91e 25
aquahika 1:4a60d3f1e91e 26 if(!ch)return false; //No Ack, return False
aquahika 1:4a60d3f1e91e 27
aquahika 1:4a60d3f1e91e 28 ch=i2c->write(0x07); //device ram address where Tobj value is present
aquahika 1:4a60d3f1e91e 29
aquahika 1:4a60d3f1e91e 30 if(!ch)return false; //No Ack, return False
aquahika 1:4a60d3f1e91e 31
aquahika 1:4a60d3f1e91e 32
aquahika 1:4a60d3f1e91e 33 i2c->start(); //repeat start
aquahika 1:4a60d3f1e91e 34 ch=i2c->write(i2caddress|0x01); //device address with read condition
aquahika 1:4a60d3f1e91e 35 if(!ch)return false; //No Ack, return False
aquahika 1:4a60d3f1e91e 36
aquahika 1:4a60d3f1e91e 37 p1=i2c->read(1); //Tobj low byte
aquahika 1:4a60d3f1e91e 38 p2=i2c->read(1); //Tobj heigh byte
aquahika 1:4a60d3f1e91e 39 p3=i2c->read(0); //PEC
aquahika 1:4a60d3f1e91e 40
aquahika 1:4a60d3f1e91e 41 i2c->stop(); //stop condition
aquahika 1:4a60d3f1e91e 42
aquahika 1:4a60d3f1e91e 43
aquahika 1:4a60d3f1e91e 44 temp_thermo=((((p2&0x007f)<<8)+p1)*0.02)-0.01; //degree centigrate conversion
aquahika 1:4a60d3f1e91e 45 *temp_val=temp_thermo-273; //Convert kelvin to degree Celsius
aquahika 1:4a60d3f1e91e 46
aquahika 1:4a60d3f1e91e 47 return true; //load data successfully, return true
lamell 5:3c4431224932 48 }
lamell 5:3c4431224932 49
lamell 5:3c4431224932 50 float MLX90614::GetEmissivity(void) {
lamell 5:3c4431224932 51 char p1,p2,p3;
lamell 5:3c4431224932 52 float temp_thermo;
lamell 5:3c4431224932 53 bool ch;
lamell 5:3c4431224932 54
lamell 5:3c4431224932 55 i2c_thermo.stop(); //stop i2c if not ack
lamell 5:3c4431224932 56 wait(0.01);
lamell 5:3c4431224932 57 i2c_thermo.start(); //start I2C
lamell 5:3c4431224932 58 ch=i2c_thermo.write(MLX96014_ADDRESS); //device address with write condition
lamell 5:3c4431224932 59
lamell 5:3c4431224932 60 if(!ch)return -90.0f; //No Ack, return False
lamell 5:3c4431224932 61
lamell 5:3c4431224932 62 ch=i2c_thermo.write(0x24); //device ram address where Tobj value is present
lamell 5:3c4431224932 63
lamell 5:3c4431224932 64 if(!ch)return -91.0f; //No Ack, return False
lamell 5:3c4431224932 65
lamell 5:3c4431224932 66
lamell 5:3c4431224932 67 i2c_thermo.start(); //repeat start
lamell 5:3c4431224932 68 ch=i2c_thermo.write(MLX96014_ADDRESS|0x01); //device address with read condition
lamell 5:3c4431224932 69 if(!ch)return -92.0f; //No Ack, return False
lamell 5:3c4431224932 70
lamell 5:3c4431224932 71 p1=i2c_thermo.read(1); //Tobj low byte
lamell 5:3c4431224932 72 p2=i2c_thermo.read(1); //Tobj heigh byte
lamell 5:3c4431224932 73 p3=i2c_thermo.read(0); //PEC
lamell 5:3c4431224932 74
lamell 5:3c4431224932 75 i2c_thermo.stop(); //stop condition
lamell 5:3c4431224932 76 semaDHT.acquire();
lamell 5:3c4431224932 77 debug("p2: %02X, p1: %02X\r\n",p2,p1);
lamell 5:3c4431224932 78 semaDHT.release();
lamell 5:3c4431224932 79
lamell 5:3c4431224932 80 //temp_thermo=((((p2&0x007f)<<8)+p1)*0.02)-0.01; //degree centigrate conversion
lamell 5:3c4431224932 81 //*temp_val=temp_thermo-273; //Convert kelvin to degree Celsius
lamell 5:3c4431224932 82
lamell 5:3c4431224932 83 return (((p2<<8) + p1)/65535.0f); //load data successfully, return true
lamell 5:3c4431224932 84 }
lamell 5:3c4431224932 85
lamell 5:3c4431224932 86 int MLX90614::BlankEEPROM(int em) {
lamell 5:3c4431224932 87 uint8_t p1[5];
lamell 5:3c4431224932 88 float temp_thermo;
lamell 5:3c4431224932 89 bool ch;
lamell 5:3c4431224932 90
lamell 5:3c4431224932 91 //CRC for this config is 0x3B
lamell 5:3c4431224932 92 p1[0]=MLX96014_ADDRESS;
lamell 5:3c4431224932 93 p1[1]=0x24;
lamell 5:3c4431224932 94 p1[2]=0x00;
lamell 5:3c4431224932 95 p1[3]=0x00;
lamell 5:3c4431224932 96
lamell 5:3c4431224932 97 // uint8_t crc = crc8(p1, 4);
lamell 5:3c4431224932 98 // debug("CRC: 0x%02X\r\n",crc);
lamell 5:3c4431224932 99
lamell 5:3c4431224932 100 i2c_thermo.stop(); //stop i2c if not ack
lamell 5:3c4431224932 101 wait(0.01);
lamell 5:3c4431224932 102 i2c_thermo.start(); //start I2C
lamell 5:3c4431224932 103 ch=i2c_thermo.write(p1[0]); //device address with write condition
lamell 5:3c4431224932 104 if(!ch)return -1; //No Ack, return False
lamell 5:3c4431224932 105
lamell 5:3c4431224932 106 ch=i2c_thermo.write(p1[1]); //device ram address where Tobj value is present
lamell 5:3c4431224932 107 if(!ch)return -2; //No Ack, return False
lamell 5:3c4431224932 108
lamell 5:3c4431224932 109 ch = i2c_thermo.write(p1[3]); //Tobj low byte
lamell 5:3c4431224932 110 if (!ch) return -3;
lamell 5:3c4431224932 111
lamell 5:3c4431224932 112 ch = i2c_thermo.write(p1[2]); //Tobj heigh byte
lamell 5:3c4431224932 113 if (!ch) return -4;
lamell 5:3c4431224932 114
lamell 5:3c4431224932 115
lamell 5:3c4431224932 116
lamell 5:3c4431224932 117 ch = i2c_thermo.write(em);
lamell 5:3c4431224932 118 if (!ch) return -5;
lamell 5:3c4431224932 119
lamell 5:3c4431224932 120 i2c_thermo.stop(); //stop condition
lamell 5:3c4431224932 121
lamell 5:3c4431224932 122 debug("Em: %1.3f\r\n",MLX90617_GetEmissivity());
lamell 5:3c4431224932 123
lamell 5:3c4431224932 124 return 0;
lamell 5:3c4431224932 125 }
lamell 5:3c4431224932 126
lamell 5:3c4431224932 127 int MLX90614::SetEmissivity(float em, uint8_t lclCrc) {
lamell 5:3c4431224932 128 uint8_t p1[5];
lamell 5:3c4431224932 129 float temp_thermo;
lamell 5:3c4431224932 130 bool ch;
lamell 5:3c4431224932 131 uint16_t number;
lamell 5:3c4431224932 132 //uint8_t *num[2];
lamell 5:3c4431224932 133
lamell 5:3c4431224932 134 temp_thermo = 65535.0f * em;
lamell 5:3c4431224932 135 number=temp_thermo;
lamell 5:3c4431224932 136 uint8_t num[2];
lamell 5:3c4431224932 137
lamell 5:3c4431224932 138 num[0] = number & 0xFF;
lamell 5:3c4431224932 139 num[1] = number >> 8;
lamell 5:3c4431224932 140
lamell 5:3c4431224932 141 //debug("F: %1.3f, INt: %d, H:%02X, L: %02X\r\n",temp_thermo,number,num[1],num[0]);
lamell 5:3c4431224932 142 // //CRC for this config is 0x3B
lamell 5:3c4431224932 143 // p1[0]=thermometer.i2caddress;
lamell 5:3c4431224932 144 // p1[1]=0x24;
lamell 5:3c4431224932 145 // p1[2]=0x19;
lamell 5:3c4431224932 146 // p1[3]=0x99;
lamell 5:3c4431224932 147
lamell 5:3c4431224932 148 //CRC for this config is 0x05
lamell 5:3c4431224932 149 p1[0]=MLX96014_ADDRESS;
lamell 5:3c4431224932 150 p1[1]=0x24;
lamell 5:3c4431224932 151 p1[2]=num[0];
lamell 5:3c4431224932 152 p1[3]=num[1];
lamell 5:3c4431224932 153
lamell 5:3c4431224932 154 // uint8_t crc = crc8(p1, 4);
lamell 5:3c4431224932 155 // debug("CRC: 0x%02X\r\n",crc);
lamell 5:3c4431224932 156
lamell 5:3c4431224932 157 i2c_thermo.stop(); //stop i2c if not ack
lamell 5:3c4431224932 158 wait(0.01);
lamell 5:3c4431224932 159 i2c_thermo.start(); //start I2C
lamell 5:3c4431224932 160 ch=i2c_thermo.write(p1[0]); //device address with write condition
lamell 5:3c4431224932 161 if(!ch)return -1; //No Ack, return False
lamell 5:3c4431224932 162
lamell 5:3c4431224932 163 ch=i2c_thermo.write(p1[1]); //device ram address where Tobj value is present
lamell 5:3c4431224932 164 if(!ch)return -2; //No Ack, return False
lamell 5:3c4431224932 165
lamell 5:3c4431224932 166 ch = i2c_thermo.write(p1[2]); //Tobj low byte
lamell 5:3c4431224932 167 if (!ch) return -3;
lamell 5:3c4431224932 168
lamell 5:3c4431224932 169 ch = i2c_thermo.write(p1[3]); //Tobj heigh byte
lamell 5:3c4431224932 170 if (!ch) return -4;
lamell 5:3c4431224932 171
lamell 5:3c4431224932 172 ch = i2c_thermo.write(lclCrc);
lamell 5:3c4431224932 173 if (!ch) return -5;
lamell 5:3c4431224932 174
lamell 5:3c4431224932 175 i2c_thermo.stop(); //stop condition
lamell 5:3c4431224932 176
lamell 5:3c4431224932 177 debug("Em: %1.3f\r\n",MLX90617_GetEmissivity());
lamell 5:3c4431224932 178
lamell 5:3c4431224932 179 return 0;
lamell 5:3c4431224932 180 }