main.cpp

00001 #include "main.h"
00002 
00003 // objects defined here with pin numbers
00004 DigitalIn button_a(p29);
00005 DigitalIn button_b(p28);
00006 DigitalIn button_c(p27);
00007 DigitalIn button_d(p26);
00008 
00009 AnalogIn ldr(p15);
00010 BusOut leds(LED4,LED3,LED2,LED1);
00011 Tone speaker(p18);
00012 
00013 BusOut rgb_led(p24,p23,p22);
00014 
00015 AnalogIn tmp36(p16);
00016 
00017 AnalogIn pot_0(p20);
00018 AnalogIn pot_1(p19);
00019 AnalogIn pot_2(p17);
00020 
00021 N5110 lcd(p8,p9,p10,p11,p13,p21);
00022 ShiftReg shift;
00023 
00024 int seven_seg_array[] = {
00025     0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67
00026 };
00027 // array that stores the colors R, G and B
00028 int rgd_led_array[] = {
00029     0b011,0b101,0b110
00030 };
00031 
00032 int led_val = 0;
00033 
00034 void init();
00035 void test_7seg();
00036 void test_buttons();
00037 void test_leds();
00038 void test_ldr();
00039 void test_tmp();
00040 void test_pots();
00041 
00042 int main()
00043 {
00044     // initialise peripherals
00045     init();
00046 
00047     // test the constant outputs
00048     test_7seg();
00049     leds = 0x0F;  // on-board LEDs
00050     speaker.play(1000.0,2.0);
00051         
00052     // loop forever
00053     while(1) {
00054 
00055         // clear LCD at beginning of each 'frame'
00056         lcd.clear();
00057         lcd.printString("Test",0,0);
00058 
00059         // test inputs and outputs that can change
00060 
00061         test_buttons();
00062         test_leds();
00063         test_ldr();
00064         test_tmp();
00065         test_pots();
00066 
00067         // print everything on the screen
00068         lcd.refresh();
00069         // small delay before next frame is drawn
00070         wait(1.0/4);
00071     }
00072 
00073 }
00074 
00075 void init()
00076 {
00077     shift.write(0x00);
00078 
00079     lcd.init();
00080 
00081     speaker.init();
00082 
00083     // PCB has external pull-down resistors so turn the internal ones off
00084     // (default for DigitalIn)
00085     button_a.mode(PullNone);
00086     button_b.mode(PullNone);
00087     button_c.mode(PullNone);
00088     button_d.mode(PullNone);
00089 }
00090 
00091 void test_7seg()
00092 {
00093     shift.write(0xFF);
00094 }
00095 
00096 void test_buttons()
00097 {
00098     // check each button, and print character on screen
00099     if ( button_a.read() == 1) {
00100         lcd.printChar('A',0,1);
00101     }
00102     if ( button_b.read() == 1) {
00103         lcd.printChar('B',8,1);
00104     }
00105     if ( button_c.read() == 1) {
00106         lcd.printChar('C',16,1);
00107     }
00108     if ( button_d.read() == 1) {
00109         lcd.printChar('D',24,1);
00110     }
00111 }
00112 
00113 void test_leds()
00114 {
00115 
00116     // set RGB to current val
00117     rgb_led = rgd_led_array[led_val];
00118 
00119     // increment the val (i.e. change colour combination)
00120     led_val++;
00121 
00122     // once we've got to end of array, go back to beginning
00123     if (led_val == 3) {
00124         led_val = 0;
00125     }
00126 
00127 }
00128 
00129 void test_ldr()
00130 {
00131     float value = ldr.read();  // read in the LDR value in range 0.0 to 1.0
00132     char buffer[14];
00133 
00134     sprintf(buffer,"LDR=%.2f",value); // print formatted data to buffer
00135     lcd.printString(buffer,0,2);           // display on screen
00136 }
00137 
00138 void test_tmp()
00139 {
00140     float value = 3.3*tmp36.read();  // read in the TMP36 value in range 0.0 to 1.0
00141     float temperature = 100.0f*value - 50.0f;
00142     char buffer[14];
00143 
00144     sprintf(buffer,"T=%.4f C",temperature); // print formatted data to buffer
00145     lcd.printString(buffer,0,3);           // display on screen
00146 }
00147 
00148 void test_pots()
00149 {
00150 
00151     char buffer[14];
00152 
00153     float val = pot_0.read();
00154     sprintf(buffer,"%.2f",val); // print formatted data to buffer
00155     lcd.printString(buffer,0,5);           // display on screen
00156     lcd.setContrast(val);  // tune LCD contrast 
00157 
00158     val = pot_1.read();
00159     sprintf(buffer,"%.2f",val); // print formatted data to buffer
00160     lcd.printString(buffer,28,5);           // display on screen
00161 
00162     val = pot_2.read();
00163     sprintf(buffer,"%.2f",val); // print formatted data to buffer
00164     lcd.printString(buffer,56,5);           // display on screen
00165 }