Android open accessory

This stub is to document the process of trying to get AOA working with older hardware. ie freeduino + spark fun host shield and phones not currently supported.

What I am using

Hardware

• Freeduino 1.22 with a ATmega328p-pu chip
• Sparkfun USB Host shield
• HTC G2

Software

• Arduino 0022
  • ADK release 0512
    • AndroidAccessory (library for Arduino)
    • USB_Host_Shield (library for Arduino)
    • demokit.pde (Arduino sketch for the demokit)*
  • Romfont USB_Host_Shield (library for Arduino)*
• Rancidbacon.com demo sketch & app
• Eclipse
  • Android SDK
    • DemoKit (demo android app that comes with the ADK)
• CyanogenMod-7-05252011-NIGHTLY-vision (based on 2.3.4)
  

* indicate that I had to change the code to get it to work.

Changes

There are a few changes that have to be made to the stoke software to get this to work.

demokit.pde

Out of the box the Arduino sketch for the demokit will not compile for the ATmega328. There are a lot of pins that are used that do not have the same name or do not exist.

#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

After removing the definitions that are not used. removed all of the functions that control things that will not be used and changed everything to LED/buttons you this is whats left.

#include <Wire.h>

#include <Max3421e.h>      //must be edited before use
#include <Usb.h>      
#include <AndroidAccessory.h>

#define  LED1        2  //digital
#define  LED2        4  //digital
#define  LED3        3  //pwm
#define  LED4        5  //pwm

#define  Button1     A0
#define  Button2     A1

AndroidAccessory acc("Google, Inc.",             //manufacturer
		     "DemoKit",                  //model
		     "DemoKit Arduino Board",    //discription
		     "1.0",                      //version
		     "http://www.android.com",   //uri
		     "0000000012345678");        //serial
void setup();
void loop();

void init_buttons()
{
	pinMode(Button1, INPUT);
	pinMode(Button2, INPUT);

	// enable the internal pullups
	digitalWrite(Button1, HIGH);
	digitalWrite(Button2, HIGH);
}


void init_leds()
{
	digitalWrite(LED1, 1);
	digitalWrite(LED2, 1);
	digitalWrite(LED3, 1);
	digitalWrite(LED4, 1);

	pinMode(LED1, OUTPUT);
	pinMode(LED2, OUTPUT);
	pinMode(LED3, OUTPUT);
	pinMode(LED4, OUTPUT);

}

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

	init_leds();
	init_buttons();

	b1 = digitalRead(Button1);
	b2 = digitalRead(Button2);

	acc.powerOn();
}

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

	if (acc.isConnected()) {       //If the arduino is talking to the phoen
		int len = acc.read(msg, sizeof(msg), 1); //set len to the size of the last msg from the phone
//		int i;
		byte b;
//		uint16_t val;
//		int x, y;
//		char c0;

		if (len > 0) {
			// assumes only one command per packet
			if (msg[0] == 0x2) {
				if (msg[1] == 0x0)
					analogWrite(LED1, 255 - msg[2]);
				else if (msg[1] == 0x1)
					analogWrite(LED2, 255 - msg[2]);
				else if (msg[1] == 0x2)
					analogWrite(LED3, 255 - msg[2]);
				else if (msg[1] == 0x3)
					analogWrite(LED4, 255 - msg[2]);
			} else if (msg[0] == 0x3) {
		}

		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;
		}
		}
	} else {
		// reset outputs to default values on disconnect
		analogWrite(LED1, 255);
		analogWrite(LED2, 255);
		analogWrite(LED3, 255);
		analogWrite(LED4, 255);
	}

	delay(10);
}