(DA) Internet of Things and Smart Electronics- ELE3006M2122 / Mbed 2 deprecated Final_Project_V19_DLeaming_25574043

Final tidy of code following installation of new sensor, more comments added prior to submission

Dependencies:   mbed

TMP102/TMP102.cpp@13:5ad65a688f3f, 2022-01-21 (annotated)

Committer:
legstar85
Date:
Fri Jan 21 14:26:56 2022 +0000
Revision:
13:5ad65a688f3f
Updated due to issues with using Start Temp variable later in program now resolved. Doxygen completed and folders in place correctly

Who changed what in which revision?

UserRevisionLine numberNew contents of line
legstar85 13:5ad65a688f3f 1 /* * Print String
legstar85 13:5ad65a688f3f 2 *
legstar85 13:5ad65a688f3f 3 * Prints a string of characters to the screen buffer, string is cut off after the 83rd pixel.
legstar85 13:5ad65a688f3f 4 * @param x - the column number (0 to 83)
legstar85 13:5ad65a688f3f 5 * @param y - the row number (0-5) - the display is split into 6 banks - each bank can be considered a row
legstar85 13:5ad65a688f3f 6 * @author - David Leaming - 25574043
legstar85 13:5ad65a688f3f 7 * @ Date - December 2021
legstar85 13:5ad65a688f3f 8 *
legstar85 13:5ad65a688f3f 9 * Acknowledgements
legstar85 13:5ad65a688f3f 10 * Craig A. Evans, University of Leeds, TMP102 Library ,Feb 2016
legstar85 13:5ad65a688f3f 11 * Dr Edmond Nurellari, University of Lincoln, Joystick & N5110 Libraries
legstar85 13:5ad65a688f3f 12 *
legstar85 13:5ad65a688f3f 13 */
legstar85 13:5ad65a688f3f 14
legstar85 13:5ad65a688f3f 15 // library implemtation file
legstar85 13:5ad65a688f3f 16
legstar85 13:5ad65a688f3f 17 // obviously need to include the header
legstar85 13:5ad65a688f3f 18 #include "TMP102.h"
legstar85 13:5ad65a688f3f 19
legstar85 13:5ad65a688f3f 20 // we now implement each of the methods listed in the header
legstar85 13:5ad65a688f3f 21
legstar85 13:5ad65a688f3f 22 // note the TMP102:: at the beginning of the method name
legstar85 13:5ad65a688f3f 23 TMP102::TMP102(PinName sda, PinName scl)
legstar85 13:5ad65a688f3f 24 {
legstar85 13:5ad65a688f3f 25 // in the constructor, we create the mbed API objects using 'new'
legstar85 13:5ad65a688f3f 26 i2c_ = new I2C(sda,scl);
legstar85 13:5ad65a688f3f 27 led_ = new DigitalOut(LED_RED);
legstar85 13:5ad65a688f3f 28 }
legstar85 13:5ad65a688f3f 29
legstar85 13:5ad65a688f3f 30 void TMP102::init()
legstar85 13:5ad65a688f3f 31 {
legstar85 13:5ad65a688f3f 32 i2c_->frequency(400000); // set bus speed to 400 kHz
legstar85 13:5ad65a688f3f 33
legstar85 13:5ad65a688f3f 34 int ack; // used to store acknowledgement bit
legstar85 13:5ad65a688f3f 35 char config_data[2]; // array for data
legstar85 13:5ad65a688f3f 36 char reg = CONFIG_REG; // register address
legstar85 13:5ad65a688f3f 37
legstar85 13:5ad65a688f3f 38 //////// Read current status of configuration register ///////
legstar85 13:5ad65a688f3f 39
legstar85 13:5ad65a688f3f 40 ack = i2c_->write(TMP102_W_ADD,&reg,1); // send the slave write address and the configuration register address
legstar85 13:5ad65a688f3f 41 if (ack)
legstar85 13:5ad65a688f3f 42 error(); // if we don't receive acknowledgement, flash error message
legstar85 13:5ad65a688f3f 43
legstar85 13:5ad65a688f3f 44 ack = i2c_->read(TMP102_R_ADD,config_data,2); // read default 2 bytes from configuration register and store in array
legstar85 13:5ad65a688f3f 45 if (ack)
legstar85 13:5ad65a688f3f 46 error(); // if we don't receive acknowledgement, flash error message
legstar85 13:5ad65a688f3f 47
legstar85 13:5ad65a688f3f 48 ///////// Configure the register //////////
legstar85 13:5ad65a688f3f 49
legstar85 13:5ad65a688f3f 50 // set conversion rate to 1 Hz - CR1 and CR2 are in the second data byte
legstar85 13:5ad65a688f3f 51 config_data[1] |= (1 << 6); // set bit 6
legstar85 13:5ad65a688f3f 52 config_data[1] &= ~(1 << 7); // clear bit 7
legstar85 13:5ad65a688f3f 53
legstar85 13:5ad65a688f3f 54 //////// Send the configured register value to the slave config register ////////////
legstar85 13:5ad65a688f3f 55
legstar85 13:5ad65a688f3f 56 // create data packet
legstar85 13:5ad65a688f3f 57 char data_packet[3] = {reg,config_data[0],config_data[1]};
legstar85 13:5ad65a688f3f 58
legstar85 13:5ad65a688f3f 59 ack = i2c_->write(TMP102_W_ADD,data_packet,3); // send the data packet to the slave write address
legstar85 13:5ad65a688f3f 60 if (ack)
legstar85 13:5ad65a688f3f 61 error(); // if we don't receive acknowledgement, flash error message
legstar85 13:5ad65a688f3f 62
legstar85 13:5ad65a688f3f 63 }
legstar85 13:5ad65a688f3f 64
legstar85 13:5ad65a688f3f 65 void TMP102::read_temperature()
legstar85 13:5ad65a688f3f 66 {
legstar85 13:5ad65a688f3f 67 int ack; // used to store acknowledgement bit
legstar85 13:5ad65a688f3f 68 char data[2]; // array for data
legstar85 13:5ad65a688f3f 69 char reg = TEMP_REG; // temperature register address
legstar85 13:5ad65a688f3f 70
legstar85 13:5ad65a688f3f 71 ack = i2c_->write(TMP102_W_ADD,&reg,1); // send temperature register address
legstar85 13:5ad65a688f3f 72 if (ack)
legstar85 13:5ad65a688f3f 73 error(); // if we don't receive acknowledgement, flash error message
legstar85 13:5ad65a688f3f 74
legstar85 13:5ad65a688f3f 75 ack = i2c_->read(TMP102_R_ADD,data,2); // read 2 bytes from temperature register and store in array
legstar85 13:5ad65a688f3f 76 if (ack)
legstar85 13:5ad65a688f3f 77 error(); // if we don't receive acknowledgement, flash error message
legstar85 13:5ad65a688f3f 78
legstar85 13:5ad65a688f3f 79 int temperature = (data[0] << 4) | (data[1] >> 4);
legstar85 13:5ad65a688f3f 80
legstar85 13:5ad65a688f3f 81 temperature_ = temperature*0.0625F;
legstar85 13:5ad65a688f3f 82 }
legstar85 13:5ad65a688f3f 83
legstar85 13:5ad65a688f3f 84 // temperature accessor method
legstar85 13:5ad65a688f3f 85 float TMP102::get_temperature()
legstar85 13:5ad65a688f3f 86 {
legstar85 13:5ad65a688f3f 87 read_temperature();
legstar85 13:5ad65a688f3f 88 return temperature_;
legstar85 13:5ad65a688f3f 89 }
legstar85 13:5ad65a688f3f 90
legstar85 13:5ad65a688f3f 91 void TMP102::error()
legstar85 13:5ad65a688f3f 92 {
legstar85 13:5ad65a688f3f 93 while(1) { // if error, hang while flashing error message
legstar85 13:5ad65a688f3f 94 led_->write(0);
legstar85 13:5ad65a688f3f 95 wait(0.2);
legstar85 13:5ad65a688f3f 96 led_->write(1);
legstar85 13:5ad65a688f3f 97 wait(0.2);
legstar85 13:5ad65a688f3f 98 }
legstar85 13:5ad65a688f3f 99 }