demokit/demokit.pde

#include <Wire.h>
#include <Servo.h>

#include <Max3421e.h>
#include <Usb.h>
#include <AndroidAccessory.h>

#include <CapSense.h>

#define  LED3_RED       2
#define  LED3_GREEN     4
#define  LED3_BLUE      3

#define  LED2_RED       5
#define  LED2_GREEN     7
#define  LED2_BLUE      6

#define  LED1_RED       8
#define  LED1_GREEN     10
#define  LED1_BLUE      9

#define  SERVO1         11
#define  SERVO2         12
#define  SERVO3         13

#define  TOUCH_RECV     14
#define  TOUCH_SEND     15

#define  RELAY1         A0
#define  RELAY2         A1

#define  LIGHT_SENSOR   A2
#define  TEMP_SENSOR    A3

#define  BUTTON1        A6
#define  BUTTON2        A7
#define  BUTTON3        A8

#define  JOY_SWITCH     A9      // pulls line down when pressed
#define  JOY_nINT       A10     // active low interrupt input
#define  JOY_nRESET     A11     // active low reset output

AndroidAccessory acc("Google, Inc.",
		     "DemoKit",
		     "DemoKit Arduino Board",
		     "1.0",
		     "http://www.android.com",
		     "0000000012345678");
Servo servos[3];

CapSense   touch_robot = CapSense(TOUCH_SEND, TOUCH_RECV);        // 10M ohm resistor on demo shield

void setup();
void loop();

void init_buttons()
{
	pinMode( BUTTON1, INPUT );
	pinMode( BUTTON2, INPUT );
	pinMode( BUTTON3, INPUT );

	digitalWrite( BUTTON1, HIGH );  // enable the internal pullups
	digitalWrite( BUTTON2, HIGH );
	digitalWrite( BUTTON3, HIGH );
}


void init_relays()
{
	pinMode( RELAY1, OUTPUT );
	pinMode( RELAY2, OUTPUT );
}


void init_leds()
{
	digitalWrite( LED1_RED,   1 );
	digitalWrite( LED1_GREEN, 1 );
	digitalWrite( LED1_BLUE,  1 );

	pinMode( LED1_RED,    OUTPUT );
	pinMode( LED1_GREEN,  OUTPUT );
	pinMode( LED1_BLUE,   OUTPUT );

	digitalWrite( LED2_RED,   1 );
	digitalWrite( LED2_GREEN, 1 );
	digitalWrite( LED2_BLUE,  1 );

	pinMode( LED2_RED,    OUTPUT );
	pinMode( LED2_GREEN,  OUTPUT );
	pinMode( LED2_BLUE,   OUTPUT );

	digitalWrite( LED3_RED,   1 );
	digitalWrite( LED3_GREEN, 1 );
	digitalWrite( LED3_BLUE,  1 );

	pinMode( LED3_RED,    OUTPUT );
	pinMode( LED3_GREEN,  OUTPUT );
	pinMode( LED3_BLUE,   OUTPUT );
}

void init_joystick( int threshold );

byte b1, b2, b3, c;
void setup()
{
	Serial.begin( 115200 );
	Serial.print("\r\nStart");

	init_leds();
	init_relays();
	init_buttons();
	init_joystick( 5 );      // initialize with thresholding enabled, dead zone of 5 units  

	touch_robot.set_CS_AutocaL_Millis(0xFFFFFFFF);    // autocalibrate OFF

	servos[0].attach(SERVO1);
	servos[0].write(90);
	servos[1].attach(SERVO2);
	servos[1].write(90);
	servos[2].attach(SERVO3);
	servos[2].write(90);


	b1 = digitalRead(BUTTON1);
	b2 = digitalRead(BUTTON2);
	b3 = digitalRead(BUTTON3);
	c = 0;

	acc.powerOn();
}

void loop()
{
	byte err;
	byte idle;
	static byte count = 0;
	byte msg[3];
	long touchcount;

	if (acc.isConnected()) {
		int len = acc.read(msg, sizeof(msg), 1);
		int i;
		byte b;
		uint16_t val;
		int x, y;
		char c0;

		if (len > 0) {
			// XXX: assumes only one command per packet
			Serial.print(msg[0], HEX);
			Serial.print(":");
			Serial.print(msg[1], HEX);
			Serial.print(":");
			Serial.println(msg[2], HEX);
			if (msg[0] == 0x2) {
				if (msg[1] == 0x0)
					analogWrite( LED1_RED, 255 - msg[2]);
				else if (msg[1] == 0x1)
					analogWrite( LED1_GREEN, 255 - msg[2]);
				else if (msg[1] == 0x2)
					analogWrite( LED1_BLUE, 255 - msg[2]);
				else if (msg[1] == 0x3)
					analogWrite( LED2_RED, 255 - msg[2]);
				else if (msg[1] == 0x4)
					analogWrite( LED2_GREEN, 255 - msg[2]);
				else if (msg[1] == 0x5)
					analogWrite( LED2_BLUE, 255 - msg[2]);
				else if (msg[1] == 0x6)
					analogWrite( LED3_RED, 255 - msg[2]);
				else if (msg[1] == 0x7)
					analogWrite( LED3_GREEN, 255 - msg[2]);
				else if (msg[1] == 0x8)
					analogWrite( LED3_BLUE, 255 - msg[2]);
				else if (msg[1] == 0x10)
					servos[0].write(map(msg[2], 0, 255, 0, 180));
				else if (msg[1] == 0x11)
					servos[1].write(map(msg[2], 0, 255, 0, 180));
				else if (msg[1] == 0x12)
					servos[2].write(map(msg[2], 0, 255, 0, 180));
			} else if (msg[0] == 0x3) {
				if (msg[1] == 0x0)
					digitalWrite( RELAY1, msg[2] ? HIGH : LOW );
				else if (msg[1] == 0x1)
					digitalWrite( RELAY2, msg[2] ? HIGH : LOW );

			}

		}

		msg[0] = 0x1;

		b = digitalRead(BUTTON1);
		if (b != b1) {
			msg[1] = 0;
			msg[2] = b ? 0 : 1;
			acc.write(msg, 3);
			b1 = b;
		}

		b = digitalRead(BUTTON2);
		if (b != b2) {
			msg[1] = 1;
			msg[2] = b ? 0 : 1;
			acc.write(msg, 3);
			b2 = b;
		}

		b = digitalRead(BUTTON3);
		if (b != b3) {
			msg[1] = 2;
			msg[2] = b ? 0 : 1;
			acc.write(msg, 3);
			b3 = b;
		}

		switch (count++ % 0x10) {

		case 0:
			val = analogRead(TEMP_SENSOR);
			msg[0] = 0x4;
			msg[1] = val >> 8;
			msg[2] = val & 0xff;
			acc.write(msg, 3);
			break;

		case 0x4:
			val = analogRead(LIGHT_SENSOR);
			msg[0] = 0x5;
			msg[1] = val >> 8;
			msg[2] = val & 0xff;
			acc.write(msg, 3);
			break;

		case 0x8:
			read_joystick(&x, &y);
			msg[0] = 0x6;
			msg[1] = constrain(x, -128, 127);
			msg[2] = constrain(y, -128, 127);
			acc.write(msg, 3);
			break;

			/* captoutched needs to be asynchonous */
		case 0xc:
			touchcount = touch_robot.capSense(5);

			c0 = touchcount > 750;

			if (c0 != c) {
				msg[0] = 0x1;
				msg[1] = 3;
				msg[2] = c0;
				acc.write(msg, 3);
				c = c0;
			}

			break;
		}
	}

	delay(10);
}

// ==============================================================================
// Austria Microsystems i2c Joystick

/*
  If a threshold is provided, the dead zone will be programmed such that interrupts will not
  be generated unless the threshold is exceeded.

  Note that if you use that mode, you will have to use passage of time with no new interrupts
  to detect that the stick has been released and has returned to center.
  
  If you need to explicitly track return to center, pass 0 as the threshold.  "Center" will
  still bounce around a little 
*/


void init_joystick( int threshold )
{
  byte status = 0;
  
  pinMode( JOY_SWITCH, INPUT );
  digitalWrite( JOY_SWITCH, HIGH );    // enable the internal pullup
  
  pinMode( JOY_nINT, INPUT );
  digitalWrite( JOY_nINT, HIGH );      // enable the internal pullup

  pinMode( JOY_nRESET, OUTPUT );

  digitalWrite( JOY_nRESET, 1 );
  delay(1);
  digitalWrite( JOY_nRESET, 0 );
  delay(1);
  digitalWrite( JOY_nRESET, 1 );

  Wire.begin();
  
  do {
    status = read_joy_reg( 0x0f );        // XXX need timeout
  } while ((status & 0xf0) != 0xf0);
  
  write_joy_reg( 0x2e, 0x86 );            // invert magnet polarity setting, per datasheet

  calibrate_joystick( threshold );        // calibrate & set up dead zone area  
}


int offset_X, offset_Y;

void calibrate_joystick( int dz )
{
  char iii;
  int x_cal = 0;
  int y_cal = 0;

  write_joy_reg( 0x0f, 0x00 );          // Low Power Mode, 20ms auto wakeup
                                        // INTn output enabled
                                        // INTn active after each measurement
                                        // Normal (non-Reset) mode
  delay(1);

  read_joy_reg( 0x11 );                 // dummy read of Y_reg to reset interrupt

  for( iii = 0; iii != 16; iii++ ) {    // read coords 16 times & average 
    while( !joystick_interrupt() )      // poll for interrupt
      ;
    x_cal += read_joy_reg( 0x10 );      // X pos
    y_cal += read_joy_reg( 0x11 );      // Y pos
  }
  
  offset_X = -(x_cal>>4);               // divide by 16 to get average
  offset_Y = -(y_cal>>4);
  
  //sprintf(msgbuf, "offsets = %d, %d\n", offset_X, offset_Y);
  //Serial.print(msgbuf);
  
  write_joy_reg( 0x12,  dz - offset_X );  // Xp, LEFT threshold for INTn
  write_joy_reg( 0x13, -dz - offset_X );  // Xn, RIGHT threshold for INTn
  write_joy_reg( 0x14,  dz - offset_Y );  // Yp, UP threshold for INTn
  write_joy_reg( 0x15, -dz - offset_Y );  // Yn, DOWN threshold for INTn

  if ( dz )                             // dead zone threshold detect requested?
    write_joy_reg( 0x0f, 0x04 );          // Low Power Mode, 20ms auto wakeup
                                          // INTn output enabled
                                          // INTn active when movement exceeds dead zone
                                          // Normal (non-Reset) mode
}


void read_joystick( int *x, int *y )
{
  *x = read_joy_reg( 0x10 ) + offset_X;
  *y = read_joy_reg( 0x11 ) + offset_Y;  // reading Y clears the interrupt
}

char joystick_interrupt()
{
  return ( digitalRead( JOY_nINT ) == 0 ); 
}


#define  JOY_I2C_ADDR    0x40

char read_joy_reg( char reg_addr )
{
  char c;
  
  Wire.beginTransmission( JOY_I2C_ADDR );
  Wire.send( reg_addr );
  Wire.endTransmission();
  
  Wire.requestFrom( JOY_I2C_ADDR, 1 );
  
  while(Wire.available())
    c = Wire.receive();
  
  return c;
}

void write_joy_reg( char reg_addr, char val )
{
  Wire.beginTransmission( JOY_I2C_ADDR );
  Wire.send( reg_addr );
  Wire.send( val );
  Wire.endTransmission();  
}