Diff: main.h

Revision:

0:53f28990602d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.h	Fri May 08 21:54:44 2015 +0000
@@ -0,0 +1,254 @@
+/**
+@file main.h
+@brief Header file containing functions prototypes, defines and global variables.
+@brief The software of Vehicle Rear Assistant.
+@brief ELEC 2645
+@author Aminuddin Omar
+@date   APRIL 2015
+*/
+
+#ifndef MAIN_H
+#define MAIN_H
+
+                                     //Declare libraries to be used 
+#include "mbed.h"
+#include "PowerControl/PowerControl.h"
+#include "PowerControl/EthernetPowerControl.h"
+#include "N5110.h"
+#include "SRF02.h"
+#include "beep.h"
+
+/**  
+@namespace lcd
+@brief GPIO pins for LCD display
+@namespace sensor
+@brief GPIO pins for SRF02
+@namespace buzzer
+@brief PWM pin for piezo buzzer
+@namespace danger
+@brief PWM pin for RED LED
+@namespace caution
+@brief PWM pin for YELLOW LED
+@namespace safe
+@brief PWM pin for GREEN LED
+@namespace lcdBrightness
+@brief PWM pin for LCD backlight
+@namespace potBrightness
+@brief AnalogIn pin for potentiometer
+@namespace button
+@brief InterruptIn pin for button
+*/                                    
+N5110 lcd(p7,p8,p9,p10,p11,p13,p26);                  //(LCD_VCC, sce, rst, dc, mosi, sck, backlight)
+SRF02 sensor(p28, p27);
+Beep buzzer(p21);                       
+PwmOut danger(p24);                                  //danger = red
+PwmOut caution(p23);                                 //caution = yellow
+PwmOut safe(p22);                                    //safe = green
+PwmOut lcdBrightness(p26);                           //lcd backlight (pin26)     
+AnalogIn potBrightness(p20);                         //potentiometer (pin20)
+InterruptIn button(p17);                             //push button to display value of distance
+
+                                    //variables                            
+int distance;             /*!< measure distance between car and object */
+int buttonFlag = 0;       /*!< print flag set in ISR */
+int displayReading = 0;   /*!< display the value of distance on LCD */
+
+                                     //Initialise all the functions
+                                     
+/**
+Print welcome message when switch is turned on
+@param a - set number of letters that can be written including space
+@param message - Print HELLO
+@param rear - Print REAR
+@param assistant - Print ASSISTANT
+@param name - Print A.OMAR
+@param number - Print 200906568
+*/
+void welcomeText();
+
+/**
+Measure distance between car and objects
+@param distance - use SRF02 to measure distance
+*/
+void getDistance();
+
+/**
+Print "CAR" and a block on LCD according to distance measured
+@param lcd.drawRect - draw rectangle to represent object 
+@param lcd.printString - draw "CAR" to represent car
+@param lcd.refresh() - refresh LCD display
+@param distanceSafe() - GREEN LED and buzzer is activated in safe mode
+@param distanceCaution() - YELLOW LED and buzzer is activated in caution mode
+@param distanceDanger() - RED LED and buzzer is activated in danger mode
+*/
+void readDistance();
+
+/**
+This function is called when in safe mode
+@param safe - only GREEN LED light up
+@brief buzzer is called and beep according to distance
+*/
+void distanceSafe();
+
+/**
+This function is called when in caution mode
+@param safe - only YELLOW LED light up
+@brief buzzer is called and beep according to distance
+*/
+void distanceCaution();
+
+/**
+This function is called when in danger mode
+@param safe - only RED LED light up
+@brief buzzer is called and beep according to distance
+*/
+void distanceDanger();
+
+/**
+This function is called when button is pressed
+@param buttonFlag - set the button flag to 1
+*/
+void buttonPressed();
+
+
+                                    //Print welcome message (letters are print one by one)
+void welcomeText()
+{     
+    int a[9] = {12,18,24,30,36,42,48,54,60};
+    const char message[6] = {'H','E','L','L','O','!'};
+    char rear[4] = {'R','E','A','R'};
+    char assistant[9] = {'A','S','S','I','S','T','A','N','T'};
+    char name[6] = {'A','.','O','M','A','R'};
+    char number[9] = {'2','0','0','9','0','6','5','6','8'};
+    int i;
+    for(i=0; i<6; i++) {
+        lcd.printChar(message[i],a[i],0);
+        wait(0.05);
+    }
+    for(i=0; i<4; i++) {
+        lcd.printChar(rear[i],a[i],2);
+        wait(0.05);
+    }
+    for(i=0; i<9; i++) {
+        lcd.printChar(assistant[i],a[i],3);
+        wait(0.05);
+    }
+    for(i=0; i<6; i++) {
+        lcd.printChar(name[i],a[i],4);
+        wait(0.05);
+    }
+    for(i=0; i<9; i++) {
+        lcd.printChar(number[i],a[i],5);
+        wait(0.05);
+    }
+    lcd.refresh();
+    wait(2.5); 
+}
+
+                                    //sensor is set to get the distance
+void getDistance()
+{
+    distance = sensor.getDistanceCm();
+}
+
+                                    //sensor read distance & lcd display 'CAR' and 'rectangle' 
+void readDistance()
+{
+        if (distance >= 230) 
+    {
+        lcd.drawRect(76,0,7,48,1);  //WALL   lcd.drawRect(76(x),0(y),7(w),48(h),1(type))
+        lcd.printString("CAR",5,3); //CAR
+        lcd.refresh();
+        distanceSafe();
+    }
+    else if (distance >= 190 & distance <= 229) 
+    {
+        lcd.drawRect(76,0,7,48,1);  //WALL
+        lcd.printString("CAR",15,3);//CAR
+        lcd.refresh();
+        distanceSafe();
+    }
+    else if (distance >= 150 & distance <= 189) 
+    {
+        lcd.drawRect(76,0,7,48,1);  //WALL
+        lcd.printString("CAR",25,3);//CAR
+        lcd.refresh();
+        distanceSafe();
+    }
+    else if (distance >= 120 & distance <= 149) 
+    {
+        lcd.drawRect(76,0,7,48,1);  //WALL
+        lcd.printString("CAR",30,3);//CAR
+        lcd.refresh();
+        distanceCaution();
+    }
+    else if (distance >= 100 & distance <= 119) 
+    {
+        lcd.drawRect(76,0,7,48,1);  //WALL
+        lcd.printString("CAR",39,3);//CAR
+        lcd.refresh();
+        distanceCaution();
+    }
+    else if (distance >= 70 & distance <= 99) 
+    {
+        lcd.drawRect(76,0,7,48,1);  //WALL
+        lcd.printString("CAR",48,3);//CAR
+        lcd.refresh();
+        distanceCaution();
+    }
+    else if (distance >=  45& distance <= 69) 
+    {
+        lcd.drawRect(76,0,7,48,1);  //WALL
+        lcd.printString("CAR",55,3);//CAR
+        lcd.refresh();
+        distanceDanger();
+    }
+    else if (distance <= 44) 
+    {
+        lcd.printString("!!STOP!!",25,3);//print "STOP" only
+        lcd.refresh();
+        distanceDanger();
+    }
+}
+
+                                //safe to reverse car
+void distanceSafe()         
+{
+    danger = 0;             
+    caution = 0;
+    safe = 1;               //>>>>>>>>>safe = green led light up in safe mode
+    buzzer.beep(1000,1);
+    wait(1);
+    buzzer.nobeep();
+}
+
+                                //caution : reverse car carefuly
+void distanceCaution()      
+{
+    danger = 0;
+    caution = 1;           //>>>>>>caution = yellow led light up in caution mode
+    safe = 0;
+    buzzer.beep(1000,1);
+    wait(0.4);
+    buzzer.nobeep();
+}
+
+                                //danger : stop reverse car
+void distanceDanger()       
+{
+    danger = 1;             //>>>>>>>danger = red led light up in danger mode
+    caution = 0;
+    safe = 0;
+    buzzer.beep(1000,1);
+    wait(0.2);
+    buzzer.nobeep();
+}
+
+
+                                //INTERRUPT SERVICE ROUTINE
+void buttonPressed() 
+{
+    buttonFlag = 1; //set flag
+}
+
+#endif