Guillaume Lefrant / Mbed 2 deprecated gtvl2_a3 Featured

This program is an advanced "IoT" thermometer using LM75B component library. It displays the current value to the Serial host in Celcius or Fahrenheit (possible to change using a switch). It also stores an historic and displays it to the user using the LCD screen. Moreover, you can change the orientation of the screen by turning the device, just like a smartphone.

Dependencies:   C12832 FXOS8700CQ LM75B mbed

main.cpp@6:6c61186c8739, 2016-02-22 (annotated)

Committer:
co838_gtvl2
Date:
Mon Feb 22 19:09:17 2016 +0000
Revision:
6:6c61186c8739
Parent:
5:c5d7fca4d111
Child:
7:e5732637dfd0
New version (might be FINAL) including sleep() for lowering power consumption and MyTimeout (custom class of Timeout) to deal with interrupts without breaking cycle delay. No more RTOS Thread, now using Serial::attach() to deal with keyboard input.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
co838_gtvl2 4:5bf99eb2d740 1 /**
co838_gtvl2 4:5bf99eb2d740 2 * This program is an advanced "IoT" thermometer using LM75B component library.
co838_gtvl2 6:6c61186c8739 3 * It displays the current value to the Serial host in Celcius or Fahrenheit.
co838_gtvl2 6:6c61186c8739 4 * It is possible to change units using SW2 switch or computer's 'c' and 'f' keys.
co838_gtvl2 6:6c61186c8739 5 * It also stores a small historic and displays it to the user using the LCD screen.
co838_gtvl2 6:6c61186c8739 6 * Moreover, you can change the orientation of the screen by turning the device, just like a smartphone.
co838_gtvl2 6:6c61186c8739 7 *
co838_gtvl2 6:6c61186c8739 8 * Note that the use of printf in the Ticker or Timeout functions is properly done.
co838_gtvl2 6:6c61186c8739 9 * If _DEBUG is defined, it is possible to have a buffer conflict, but not if _DEBUG is undefined.
co838_gtvl2 6:6c61186c8739 10 *
co838_gtvl2 4:5bf99eb2d740 11 *
co838_gtvl2 4:5bf99eb2d740 12 * Created by Guillaume Lefrant gtvl2
co838_gtvl2 4:5bf99eb2d740 13 **/
co838_gtvl2 4:5bf99eb2d740 14
co838_gtvl2 1:06713d1b69cf 15 #include "main.h"
co838_gtvl2 1:06713d1b69cf 16 #include "ThermalDisplayer.h"
co838_gtvl2 6:6c61186c8739 17 #include "MyTimeout.hpp"
co838_gtvl2 0:362773c24009 18
co838_gtvl2 6:6c61186c8739 19 Serial pc(USBTX, USBRX); // Serial Host
co838_gtvl2 6:6c61186c8739 20 LM75B lm_temp(D14, D15); // Thermal Sensor
co838_gtvl2 6:6c61186c8739 21 InterruptIn sw2_int(SW2); // SW2
co838_gtvl2 6:6c61186c8739 22 DigitalOut tilt_led(LED1); // Red LED
co838_gtvl2 6:6c61186c8739 23 DigitalOut r_led(PTA2); // RGB LED
co838_gtvl2 6:6c61186c8739 24 DigitalOut g_led(PTC4);
co838_gtvl2 6:6c61186c8739 25 DigitalOut b_led(PTC12);
co838_gtvl2 6:6c61186c8739 26 AnalogIn pot(A0); // Potentiometer POT1
co838_gtvl2 6:6c61186c8739 27 MyTimeout process_timeout; // Main timeout used for the whole process
co838_gtvl2 0:362773c24009 28
co838_gtvl2 6:6c61186c8739 29 volatile bool celcius = true; // Global boolean for unit Celcius / Fahrenheit
co838_gtvl2 6:6c61186c8739 30 volatile int refresh_time = 3000;
co838_gtvl2 6:6c61186c8739 31
co838_gtvl2 6:6c61186c8739 32 ThermalDisplayer temp_display = ThermalDisplayer();
co838_gtvl2 0:362773c24009 33
co838_gtvl2 1:06713d1b69cf 34 /*
co838_gtvl2 6:6c61186c8739 35 * SW2 handler
co838_gtvl2 1:06713d1b69cf 36 */
co838_gtvl2 6:6c61186c8739 37 void sw_interrupt(void)
co838_gtvl2 2:5d0c209e5c61 38 {
co838_gtvl2 6:6c61186c8739 39 celcius = !celcius;
co838_gtvl2 6:6c61186c8739 40
co838_gtvl2 0:362773c24009 41 if (celcius) {
co838_gtvl2 0:362773c24009 42 r_led = 1.0;
co838_gtvl2 4:5bf99eb2d740 43 g_led = 1.0;
co838_gtvl2 4:5bf99eb2d740 44 b_led = 0.0;
co838_gtvl2 0:362773c24009 45 } else {
co838_gtvl2 0:362773c24009 46 r_led = 0.0;
co838_gtvl2 0:362773c24009 47 g_led = 1.0;
co838_gtvl2 4:5bf99eb2d740 48 b_led = 1.0;
co838_gtvl2 2:5d0c209e5c61 49 }
co838_gtvl2 0:362773c24009 50 }
co838_gtvl2 0:362773c24009 51
co838_gtvl2 1:06713d1b69cf 52 /*
co838_gtvl2 6:6c61186c8739 53 * Interrupt that does the same as above but using keyboard of host
co838_gtvl2 1:06713d1b69cf 54 */
co838_gtvl2 6:6c61186c8739 55 void host_interrupt(void)
co838_gtvl2 5:c5d7fca4d111 56 {
co838_gtvl2 6:6c61186c8739 57 #if defined _DEBUG
co838_gtvl2 6:6c61186c8739 58 pc.printf("Check if pc key as been pressed\r\n");
co838_gtvl2 6:6c61186c8739 59 #endif
co838_gtvl2 6:6c61186c8739 60 if (pc.readable()) {
co838_gtvl2 6:6c61186c8739 61 char c = pc.getc();
co838_gtvl2 6:6c61186c8739 62 switch(c) {
co838_gtvl2 6:6c61186c8739 63 case 'c':
co838_gtvl2 6:6c61186c8739 64 celcius = false;
co838_gtvl2 6:6c61186c8739 65 sw_interrupt();
co838_gtvl2 6:6c61186c8739 66 break;
co838_gtvl2 6:6c61186c8739 67 case 'f':
co838_gtvl2 6:6c61186c8739 68 celcius = true;
co838_gtvl2 6:6c61186c8739 69 sw_interrupt();
co838_gtvl2 6:6c61186c8739 70 break;
co838_gtvl2 6:6c61186c8739 71 default:
co838_gtvl2 6:6c61186c8739 72 break;
co838_gtvl2 5:c5d7fca4d111 73 }
co838_gtvl2 5:c5d7fca4d111 74 }
co838_gtvl2 5:c5d7fca4d111 75 }
co838_gtvl2 5:c5d7fca4d111 76
co838_gtvl2 6:6c61186c8739 77 void process_function(void)
co838_gtvl2 2:5d0c209e5c61 78 {
co838_gtvl2 6:6c61186c8739 79 tilt_led = 0.0;
co838_gtvl2 6:6c61186c8739 80 // IMPORTANT. Check MyTimeout.hpp for details.
co838_gtvl2 6:6c61186c8739 81 process_timeout.detach();
co838_gtvl2 6:6c61186c8739 82
co838_gtvl2 6:6c61186c8739 83 /*
co838_gtvl2 6:6c61186c8739 84 * Get temperature using LM75B
co838_gtvl2 6:6c61186c8739 85 * and display it to LCD screen
co838_gtvl2 6:6c61186c8739 86 */
co838_gtvl2 6:6c61186c8739 87 float temperature = lm_temp.read();
co838_gtvl2 6:6c61186c8739 88 temp_display.addTemp(temperature);
co838_gtvl2 6:6c61186c8739 89 temp_display.adjustScale();
co838_gtvl2 6:6c61186c8739 90 temp_display.display();
co838_gtvl2 6:6c61186c8739 91
co838_gtvl2 6:6c61186c8739 92
co838_gtvl2 6:6c61186c8739 93 /*
co838_gtvl2 6:6c61186c8739 94 * Display value to host according to unit choosed with SW2.
co838_gtvl2 6:6c61186c8739 95 * Could have been a ternary, but it's easier to read like this.
co838_gtvl2 6:6c61186c8739 96 * In production (without _DEBUG), this is the only printf executed.
co838_gtvl2 6:6c61186c8739 97 */
co838_gtvl2 6:6c61186c8739 98 if (pc.writeable()) {
co838_gtvl2 6:6c61186c8739 99 if (celcius) {
co838_gtvl2 6:6c61186c8739 100 pc.printf("Temp: %.2f deg Celcius.\r\n", temperature);
co838_gtvl2 6:6c61186c8739 101 } else {
co838_gtvl2 6:6c61186c8739 102 pc.printf("Temp: %.2f deg Fahrenheit.\r\n", (temperature * 1.8f + 32.0f));
co838_gtvl2 6:6c61186c8739 103 }
co838_gtvl2 5:c5d7fca4d111 104 }
co838_gtvl2 2:5d0c209e5c61 105
co838_gtvl2 6:6c61186c8739 106 /*
co838_gtvl2 6:6c61186c8739 107 * Change refresh_time according to POT1's value
co838_gtvl2 6:6c61186c8739 108 */
co838_gtvl2 6:6c61186c8739 109 refresh_time = (int) (MIN_REFRESH_TIME + ((1.0f - pot) * (MAX_REFRESH_TIME - MIN_REFRESH_TIME)));
co838_gtvl2 6:6c61186c8739 110 tilt_led = 1.0;
co838_gtvl2 6:6c61186c8739 111 }
co838_gtvl2 2:5d0c209e5c61 112
co838_gtvl2 6:6c61186c8739 113 int main(void)
co838_gtvl2 6:6c61186c8739 114 {
co838_gtvl2 6:6c61186c8739 115 pc.baud(38400);
co838_gtvl2 6:6c61186c8739 116 if (pc.writeable()) {
co838_gtvl2 6:6c61186c8739 117 pc.printf("Hello gtvl2, from FRDM-K64F!\r\nUse POT1 to change the refresh rate, POT2 to change the scale of the graphic and SW2 or keyboard to change the unit.\r\n");
co838_gtvl2 6:6c61186c8739 118 }
co838_gtvl2 2:5d0c209e5c61 119
co838_gtvl2 1:06713d1b69cf 120 /*
co838_gtvl2 1:06713d1b69cf 121 * Thermal unit control
co838_gtvl2 1:06713d1b69cf 122 */
co838_gtvl2 0:362773c24009 123 sw2_int.mode(PullUp);
co838_gtvl2 6:6c61186c8739 124 sw2_int.fall(&sw_interrupt);
co838_gtvl2 6:6c61186c8739 125 pc.attach(&host_interrupt);
co838_gtvl2 2:5d0c209e5c61 126
co838_gtvl2 6:6c61186c8739 127 r_led = 1.0;
co838_gtvl2 6:6c61186c8739 128 g_led = 1.0;
co838_gtvl2 6:6c61186c8739 129 b_led = 0.0;
co838_gtvl2 2:5d0c209e5c61 130
co838_gtvl2 6:6c61186c8739 131 // Do once
co838_gtvl2 6:6c61186c8739 132 process_function();
co838_gtvl2 6:6c61186c8739 133 wait_ms(1);
co838_gtvl2 6:6c61186c8739 134 // Then forever
co838_gtvl2 6:6c61186c8739 135 while (true) {
co838_gtvl2 6:6c61186c8739 136 if (!process_timeout.hasAttachment()) {
co838_gtvl2 6:6c61186c8739 137 #if defined _DEBUG
co838_gtvl2 6:6c61186c8739 138 pc.printf("Next value in %.3f seconds\r\n", refresh_time / 1000.0f);
co838_gtvl2 6:6c61186c8739 139 #endif
co838_gtvl2 6:6c61186c8739 140 process_timeout.attach_us(&process_function, (float) refresh_time * 1000.0f);
co838_gtvl2 0:362773c24009 141 }
co838_gtvl2 6:6c61186c8739 142 #if defined _DEBUG
co838_gtvl2 6:6c61186c8739 143 else {
co838_gtvl2 6:6c61186c8739 144 pc.printf("Won't attach again the timer.\r\n");
co838_gtvl2 6:6c61186c8739 145 }
co838_gtvl2 6:6c61186c8739 146 #endif
co838_gtvl2 6:6c61186c8739 147 sleep();
co838_gtvl2 0:362773c24009 148 }
co838_gtvl2 0:362773c24009 149 }