Nikollao Sulollari / TMP102

TMP102

TMP102.cpp@0:fea9b4d9a373, 2016-02-10 (annotated)

Committer:
Nikollao
Date:
Wed Feb 10 16:10:42 2016 +0000
Revision:
0:fea9b4d9a373
now the library is ready to use;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Nikollao 0:fea9b4d9a373 1 #include "TMP102"
Nikollao 0:fea9b4d9a373 2
Nikollao 0:fea9b4d9a373 3 TMP102::TMP102(PinName sda, PinName scl)
Nikollao 0:fea9b4d9a373 4 {
Nikollao 0:fea9b4d9a373 5 is2_ = new I2C(sda,scl);
Nikollao 0:fea9b4d9a373 6 led_ = new DigitalOut(LED_RED);
Nikollao 0:fea9b4d9a373 7 }
Nikollao 0:fea9b4d9a373 8
Nikollao 0:fea9b4d9a373 9 void TMP102::init() {
Nikollao 0:fea9b4d9a373 10
Nikollao 0:fea9b4d9a373 11 i2c_->frequency(400000);
Nikollao 0:fea9b4d9a373 12 int ack;
Nikollao 0:fea9b4d9a373 13 char config_data[2];
Nikollao 0:fea9b4d9a373 14 char reg CONFIG_REG;
Nikollao 0:fea9b4d9a373 15
Nikollao 0:fea9b4d9a373 16 ack = i2c_->write(TMP102_W_ADD,&reg,1);
Nikollao 0:fea9b4d9a373 17
Nikollao 0:fea9b4d9a373 18 if (ack)
Nikollao 0:fea9b4d9a373 19
Nikollao 0:fea9b4d9a373 20 error();
Nikollao 0:fea9b4d9a373 21
Nikollao 0:fea9b4d9a373 22 i2c_->read(TMP102_R_ADD,&config_data,1);
Nikollao 0:fea9b4d9a373 23
Nikollao 0:fea9b4d9a373 24 if (ack)
Nikollao 0:fea9b4d9a373 25
Nikollao 0:fea9b4d9a373 26 error();
Nikollao 0:fea9b4d9a373 27
Nikollao 0:fea9b4d9a373 28 //set conversion rate to 1 Hz
Nikollao 0:fea9b4d9a373 29 config_data[1] |= (1<<6); //set bit 6
Nikollao 0:fea9b4d9a373 30 config_data[1] &= ~(1<<7); //clear bit 7
Nikollao 0:fea9b4d9a373 31
Nikollao 0:fea9b4d9a373 32 char data_packet[3] = {reg, config_data[0], config_data[1]};
Nikollao 0:fea9b4d9a373 33
Nikollao 0:fea9b4d9a373 34 ack = i2c_->write(TMP102_W_ADD,data_packet,3);
Nikollao 0:fea9b4d9a373 35
Nikollao 0:fea9b4d9a373 36 if (ack)
Nikollao 0:fea9b4d9a373 37 error();
Nikollao 0:fea9b4d9a373 38
Nikollao 0:fea9b4d9a373 39 }
Nikollao 0:fea9b4d9a373 40
Nikollao 0:fea9b4d9a373 41 void TMP102::read_temperature() {
Nikollao 0:fea9b4d9a373 42
Nikollao 0:fea9b4d9a373 43 int ack;
Nikollao 0:fea9b4d9a373 44 char data[2];
Nikollao 0:fea9b4d9a373 45 char reg TEMP_REG;
Nikollao 0:fea9b4d9a373 46
Nikollao 0:fea9b4d9a373 47 ack = i2c_->write (TMP102_W_ADD,&reg,1);
Nikollao 0:fea9b4d9a373 48
Nikollao 0:fea9b4d9a373 49 if (ack)
Nikollao 0:fea9b4d9a373 50 error();
Nikollao 0:fea9b4d9a373 51
Nikollao 0:fea9b4d9a373 52 ack = i2c_->read(TMP102_R_ADD,data,2);
Nikollao 0:fea9b4d9a373 53
Nikollao 0:fea9b4d9a373 54 if (ack)
Nikollao 0:fea9b4d9a373 55 error(); //if we don't receive acknowledgment, flash error message
Nikollao 0:fea9b4d9a373 56
Nikollao 0:fea9b4d9a373 57 int temperature = (data[0] << 4) | (data[1] >> 4);
Nikollao 0:fea9b4d9a373 58
Nikollao 0:fea9b4d9a373 59 temperature_ = temperature*0.0625F;
Nikollao 0:fea9b4d9a373 60
Nikollao 0:fea9b4d9a373 61 }
Nikollao 0:fea9b4d9a373 62
Nikollao 0:fea9b4d9a373 63 float TMP102::get_temperature() {
Nikollao 0:fea9b4d9a373 64
Nikollao 0:fea9b4d9a373 65 read_temperature();
Nikollao 0:fea9b4d9a373 66 return temperature_;
Nikollao 0:fea9b4d9a373 67 }
Nikollao 0:fea9b4d9a373 68
Nikollao 0:fea9b4d9a373 69 void TMP102::error() {
Nikollao 0:fea9b4d9a373 70
Nikollao 0:fea9b4d9a373 71 while (1) {
Nikollao 0:fea9b4d9a373 72
Nikollao 0:fea9b4d9a373 73 led_-> write(0);
Nikollao 0:fea9b4d9a373 74 wait(0.2);
Nikollao 0:fea9b4d9a373 75 led_> write(1);
Nikollao 0:fea9b4d9a373 76 wait(0.2);
Nikollao 0:fea9b4d9a373 77 }
Nikollao 0:fea9b4d9a373 78 }
Nikollao 0:fea9b4d9a373 79
Nikollao 0:fea9b4d9a373 80
Nikollao 0:fea9b4d9a373 81
Nikollao 0:fea9b4d9a373 82