main.cpp

00001 #include "mbed.h"
00002 
00003 BusOut mbedleds(LED1,LED2,LED3,LED4);
00004 //BusOut/In is faster than multiple DigitalOut/Ins
00005 
00006 class Nav_Switch
00007 {
00008 public:
00009     Nav_Switch(PinName up,PinName down,PinName left,PinName right,PinName fire);
00010     int read();
00011 //boolean functions to test each switch
00012     bool up();
00013     bool down();
00014     bool left();
00015     bool right();
00016     bool fire();
00017 //automatic read on RHS
00018     operator int ();
00019 //index to any switch array style
00020     bool operator[](int index) {
00021         return _pins[index];
00022     };
00023 private:
00024     BusIn _pins;
00025 
00026 };
00027 Nav_Switch::Nav_Switch (PinName up,PinName down,PinName left,PinName right,PinName fire):
00028     _pins(up, down, left, right, fire)
00029 {
00030     _pins.mode(PullUp); //needed if pullups not on board or a bare nav switch is used - delete otherwise
00031     wait(0.001); //delays just a bit for pullups to pull inputs high
00032 }
00033 inline bool Nav_Switch::up()
00034 {
00035     return !(_pins[0]);
00036 }
00037 inline bool Nav_Switch::down()
00038 {
00039     return !(_pins[1]);
00040 }
00041 inline bool Nav_Switch::left()
00042 {
00043     return !(_pins[2]);
00044 }
00045 inline bool Nav_Switch::right()
00046 {
00047     return !(_pins[3]);
00048 }
00049 inline bool Nav_Switch::fire()
00050 {
00051     return !(_pins[4]);
00052 }
00053 inline int Nav_Switch::read()
00054 {
00055     return _pins.read();
00056 }
00057 inline Nav_Switch::operator int ()
00058 {
00059     return _pins.read();
00060 }
00061 
00062 Nav_Switch myNav( p9, p6, p7, p5, p8); //pin order on Sparkfun breakout
00063 
00064 int main()
00065 {
00066     while(1) {
00067         //with pullups a button hit is a "0" - "~" inverts data to leds
00068         mbedleds = ~(myNav & 0x0F); //update leds with nav switch direction inputs
00069         if(myNav.fire()) mbedleds = 0x0F; //special all leds on case for fire (center button)
00070         //or use - if(myNav[4]==0) mbedleds = 0x0F; //can index a switch bit like this
00071         wait(0.02);
00072     }
00073 }