main.cpp

00001 #include "mbed.h"
00002 #include "USBMouse.h"
00003 //USB mouse demo using a 5-way Navigation Switch (Digital Joystick)
00004 //Needs USB connector breakout with D+, D-, and Gnd to mbed LLP1768
00005 USBMouse mouse;
00006 PwmOut myled(LED1);
00007 AnalogIn mypotentiometer(p18);
00008 Serial pc(USBTX, USBRX);
00009 
00010 class Nav_Switch
00011 {
00012 public:
00013     Nav_Switch(PinName up,PinName down,PinName left,PinName right,PinName fire);
00014     int read();
00015 //boolean functions to test each switch
00016     bool up();
00017     bool down();
00018     bool left();
00019     bool right();
00020     bool fire();
00021 //automatic read on RHS
00022     operator int ();
00023 //index to any switch array style
00024     bool operator[](int index) {
00025         return _pins[index];
00026     };
00027 private:
00028     BusIn _pins;
00029 
00030 };
00031 Nav_Switch::Nav_Switch (PinName up,PinName down,PinName left,PinName right,PinName fire):
00032     _pins(up, down, left, right, fire)
00033 {
00034     _pins.mode(PullUp); //needed if pullups not on board or a bare nav switch is used - delete otherwise
00035     wait(0.001); //delays just a bit for pullups to pull inputs high
00036 }
00037 inline bool Nav_Switch::up()
00038 {
00039     return !(_pins[0]);
00040 }
00041 inline bool Nav_Switch::down()
00042 {
00043     return !(_pins[1]);
00044 }
00045 inline bool Nav_Switch::left()
00046 {
00047     return !(_pins[2]);
00048 }
00049 inline bool Nav_Switch::right()
00050 {
00051     return !(_pins[3]);
00052 }
00053 inline bool Nav_Switch::fire()
00054 {
00055     return !(_pins[4]);
00056 }
00057 inline int Nav_Switch::read()
00058 {
00059     return _pins.read();
00060 }
00061 inline Nav_Switch::operator int ()
00062 {
00063     return _pins.read();
00064 }
00065 
00066 Nav_Switch myNav( p9, p6, p7, p5, p8); //pin order on Sparkfun Nav SW breakout
00067 
00068 int main()
00069 {
00070     float pot_data = 0;
00071     float scroll_amount = 0;
00072     int16_t x = 0;
00073     int16_t y = 0;
00074     uint8_t left_click = 0;
00075     while (1) {
00076         //check relative mouse movement
00077         x=0;
00078         y=0;
00079         scroll_amount = 0;
00080         if (myNav.up()) x=-1;
00081         if (myNav.down()) x=1;
00082         if (myNav.left()) y=1;
00083         if (myNav.right()) y=-1;
00084         //check mouse left button click
00085         if (myNav.fire()) left_click = 1;
00086         if (!myNav.fire())left_click = 0;
00087         //send a mouse data packet to PC
00088         myled = mypotentiometer;
00089         pot_data = mypotentiometer;
00090         
00091         if (pot_data < 0.25) {
00092             scroll_amount = -1; }
00093         else if (pot_data > 0.75) {
00094             scroll_amount = 1; }      
00095         
00096         pc.printf("%f \n\r",scroll_amount);
00097         mouse.update(x, y, left_click, scroll_amount);
00098         wait(0.001);
00099     }
00100 }