Our main file for the ARM mbed system looked a bit like this, very simple;
Serial pc (USBTX, USBRX);
//Device PIN specification
//SERIAL_TX=PA_2 I2C_SCL=PB_8 SPI_MOSI=PA_7 PWM_OUT=PB_3
//SERIAL_RX=PA_3 I2C_SDA=PB_9 SPI_MISO=PA_6
// SPI_SCK =PA_5
// SPI_CS =PB_6
AnalogIn xAxis(A0);
AnalogIn yAxis(A1);
PwmOut pwm(PB_3);
int x,y,button; // global variables to hold values
Ticker joystick; // recurring interrupt to get joystick data
void joystick_Int_Handler()
{
x = xAxis.read() * 1000; // float (0->1) to int (0-1000)
y = yAxis.read() * 1000;
if ( (x > 900) || (y > 900) )
button = 1;
else
button = 0;
}
int main()
{
pwm.period(0.050);
// init interrupt, call every .2s
joystick.attach(joystick_Int_Handler,0.2);
// Print out the variables
while(1){
if(x < 800 && 600 < x && y < 800 && 600 < y ){
pwm.pulsewidth(0.0015);
}
else if(x > 800 && y > 800 ){
pwm.pulsewidth(0.00175);
}
else if(x < 600 && y < 600 ){
pwm.pulsewidth(0.00125);
}
else if(x > 800 && y < 600 ){
pwm.pulsewidth(0.00125);
}
else if(x < 600 ){
pwm.pulsewidth(0.0025);
}
else if(y < 600 ){
pwm.pulsewidth(0.001);
}
else if(y > 800 ){
pwm.pulsewidth(0.002);
}
else if(x > 800 ){
pwm.pulsewidth(0.0015);
}
pc.printf("\rX=%3d,Y=%3d",x,y);
}
}
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