Using Joystick on Butterfly Board

Hi, im new to the forums so apologies for posting in the incorrect place if i have done so, also i am new to programming avr butterfly boards and this doesnt help when i have a problem. I am making a small program that when the joystick is pressed up it displays "North" on the lcd display, when i press south it displays "south" on the lcd display and so forth. I am having a problem with using the joystick to do this though, so far i have managed to display "North" but only when the program has loaded, i have trawled throught internet site after internet site looking for any relative information to my problem so i can try to understand what i have done wrong. it would be appreciated if someone could look at my code and give me some tips on how to overcome this problem.

thanks

DDyne

CODE

#include <avr/io.h>

typedef unsigned int u32;
typedef unsigned char u8;

u32 LCD_character_table[] =
{
0x5559, // '0'
0x0118, // '1'
0x1e11, // '2
0x1b11, // '3
0x0b50, // '4
0x1b41, // '5
0x1f41, // '6
0x0111, // '7
0x1f51, // '8
0x1b51, // '9'
0x0000, // ':' (Not defined)
0x0000, // ';' (Not defined)
0x0000, // '<' (Not defined)
0x0000, // '=' (Not defined)
0x0000, // '>' (Not defined)
0x0000, // '?' (Not defined)
0x0000, // '@' (Not defined)
0x0f51, // 'A' (+ 'a')
0x3991, // 'B' (+ 'b')
0x1441, // 'C' (+ 'c')
0x3191, // 'D' (+ 'd')
0x1e41, // 'E' (+ 'e')
0x0e41, // 'F' (+ 'f')
0x1d41, // 'G' (+ 'g')
0x0f50, // 'H' (+ 'h')
0x2080, // 'I' (+ 'i')
0x1510, // 'J' (+ 'j')
0x8648, // 'K' (+ 'k')
0x1440, // 'L' (+ 'l')
0x0578, // 'M' (+ 'm')
0x8570, // 'N' (+ 'n')
0x1551, // 'O' (+ 'o')
0x0e51, // 'P' (+ 'p')
0x9551, // 'Q' (+ 'q')
0x8e51, // 'R' (+ 'r')
0x9021, // 'S' (+ 's')
0x2081, // 'T' (+ 't')
0x1550, // 'U' (+ 'u')
0x4448, // 'V' (+ 'v')
0xc550, // 'W' (+ 'w')
0xc028, // 'X' (+ 'x')
0x2028, // 'Y' (+ 'y')
0x5009, // 'Z' (+ 'z')
};

void init (void)
{
//LCD Control and Staus Register B (hexB7 - (below)) - (LCDCS-external asynchronous clock source used)
//(mux1-duty cycle, 1/4 duty, 1/2 or 1/3 Bias, COMO:3 Pin and i/o Port pin-none) PM2-0 - Sets Sement driver to SEG0:24 n no of segments to 25
LCDCRB = (_BV(LCDCS) | _BV(LCDMUX1) | _BV(LCDMUX0) | _BV(LCDPM2) | _BV(LCDPM1) | _BV(LCDPM0)); //external clock,0.25 duty cycle, port mask 25

//LCD Frame Rate Register (hex10 =(LCDpS0) - Sets LCD Prescaler to 8.1KHz
LCDFRR = _BV(LCDPS0);

//LCD Contrast COntroll Register (hexF=(below)) - Sets maximum volatge to 3.35 V
LCDCCR = _BV(LCDCC3) | _BV(LCDCC2) | _BV(LCDCC1) | _BV(LCDCC0);

// LCD Control and Status Register A (hex80=LCDEN) - Enables LCD Controller/Driver.
LCDCRA = _BV(LCDEN);
}

void delay(void)
{
u32 c;
for (c = 0; c < 0xffff; c++);
}

void LCD_Write_Digit( u8 character,u8 character2, u8 character3, u8 character4, u8 character5) //Character arrays to hold write digit letters
{
u32 digit,digit2,digit3,digit4,digit5, number1, number2, number3, number4, number5, number; // setting Digits and numbers to hold array data
u32 mask, LCDDRbase; // Setting mask and LCDDRbase
u8 count, i; // setting coutn and i
u8 *ptr; // setting pointer
LCDDRbase = 0xec; //Setting the LCDDRbase to LCDDR0
mask = 0x000f; //Setting mask

character = character - 0x30; // takes away 30 hex from the character to find its position in the array table
character2 = character2 - 0x30;
character3 = character3 - 0x30;
character4 = character4 - 0x30;
character5 = character5 - 0x30;

ptr = (char *) (LCDDRbase); //0xec is the address of LCDDR0

/* Test to see if odd or even. if even then the upper nibble of
LCDDRx is enabled, if odd then lower nibble enabled */

digit = LCD_character_table [character]; //get character
digit2 = LCD_character_table [character2]; // get second character
digit3 = LCD_character_table [character3]; // get third character
digit4 = LCD_character_table [character4]; // get fourth character
digit5 = LCD_character_table [character5];

for (i = 0; i < 4; i++)
{

number1 = digit & mask; //mask off upper nibble of lcddrx
number2 = digit2 & mask; // mask off upper nibble of lcddrx and sets digit2 to number2
number2=number2<<4; // shifts number 2 to LCD register to the left
number= number1 | number2; // ORS number1 and 2 and sets to number
*ptr = number; //output value to LCDDRx + ptr
ptr+=5; //inctrment to next LCDDRx register
digit=digit>>=4; // moves digit on
digit2=digit2>>=4;// etc

}

LCDDRbase = 0xed;
mask = 0x000f;
ptr = (char *) (LCDDRbase);

for (i = 0; i < 4; i++)
{
number3 = digit3 & mask; //mask off upper nibble of lcddrx
number4 = digit4 & mask;
number4=number4<<4;
number= number3 | number4;
*ptr = number; //output value to LCDDRx + ptr
ptr+=5; //inctrment to next LCDDRx register
digit3=digit3>>=4;
digit4=digit4>>=4;

}

LCDDRbase = 0xee;
mask = 0x000f;
ptr = (char *) (LCDDRbase);

for (i = 0; i < 4; i++)
{
number5 = digit5 & mask; //mask off upper nibble of lcddrx
number= number5;
*ptr = number; //output value to LCDDRx + ptr
ptr+=5; //inctrment to next LCDDRx register
digit5=digit5>>=4;

}

}

main()
{
init();
while(1)
{
LCD_Write_Digit('N','O','R','T', 'H');//Letters to be sent to be taken from array table.
delay();
delay();
delay();
delay();
delay();

}

}

You are right. I could not find any documentation that mapped the
Butterfly Joystick so I did it by trial-and-error.

I'm an ASM programmer, not a C programmer so I can't give you the code, but I have included part of my ASM program.

Basically the Joystick is connected to TWO ports.
Port B and Port E:

PORT B, PIN 4 - Joystick Centre
PORT B, PIN 6 - Joystick Up (North)
PORT B, PIN 7 - Joystick Down (South)

PORT E, PIN 2 - Joystick Left (West)
PORT E, PIN 3 - Joystick Right (East)

Each Pin is pulled to Ground (0) when joystick is moved.

CODE

OUT PORTB,FF ;SET PORT B & E FOR INPUT
OUT PORTE,FF

SBIS PINB,6 ;JOYSTICK UP?
RJMP START_8MHZ
SBIS PINB,7 ;JOYSTICK DOWN
RJMP START_2MHZ
SBIS PINE,2 ;JOYSTICK LEFT
RJMP START_4MHZ
SBIS PINE,3 ;JOYSTICK RIGHT
RJMP START_1MHZ
SBIC PINB,4 ;JOYSTICK CENTRE

well thanks to your code, we kinda figured out how it worked in c and we got this to work.

CODE

#include <avr/io.h>
typedef unsigned int u32;
typedef unsigned char u8;

u32 LCD_character_table[] =
{
0x5559, // '0'
0x0118, // '1'
0x1e11, // '2
0x1b11, // '3
0x0b50, // '4
0x1b41, // '5
0x1f41, // '6
0x0111, // '7
0x1f51, // '8
0x1b51, // '9'
0x0000, // ':' (Not defined)
0x0000, // ';' (Not defined)
0x0000, // '<' (Not defined)
0x0000, // '=' (Not defined)
0x0000, // '>' (Not defined)
0x0000, // '?' (Not defined)
0x0000, // '@' (Not defined)
0x0f51, // 'A' (+ 'a')
0x3991, // 'B' (+ 'b')
0x1441, // 'C' (+ 'c')
0x3191, // 'D' (+ 'd')
0x1e41, // 'E' (+ 'e')
0x0e41, // 'F' (+ 'f')
0x1d41, // 'G' (+ 'g')
0x0f50, // 'H' (+ 'h')
0x2080, // 'I' (+ 'i')
0x1510, // 'J' (+ 'j')
0x8648, // 'K' (+ 'k')
0x1440, // 'L' (+ 'l')
0x0578, // 'M' (+ 'm')
0x8570, // 'N' (+ 'n')
0x1551, // 'O' (+ 'o')
0x0e51, // 'P' (+ 'p')
0x9551, // 'Q' (+ 'q')
0x8e51, // 'R' (+ 'r')
0x9021, // 'S' (+ 's')
0x2081, // 'T' (+ 't')
0x1550, // 'U' (+ 'u')
0x4448, // 'V' (+ 'v')
0xc550, // 'W' (+ 'w')
0xc028, // 'X' (+ 'x')
0x2028, // 'Y' (+ 'y')
0x5009, // 'Z' (+ 'z')
};

void init (void)
//for LCD
{
//LCD Control and Staus Register B (hexB7 - (below)) - (LCDCS-external asynchronous clock source used)
//(mux1-duty cycle, 1/4 duty, 1/2 or 1/3 Bias, COMO:3 Pin and i/o Port pin-none) PM2-0 - Sets Sement driver to SEG0:24 n no of segments to 25
LCDCRB = (_BV(LCDCS) | _BV(LCDMUX1) | _BV(LCDMUX0) | _BV(LCDPM2) | _BV(LCDPM1) | _BV(LCDPM0)); //external clock,0.25 duty cycle, port mask 25

//LCD Frame Rate Register (hex10 =(LCDpS0) - Sets LCD Prescaler to 8.1KHz
LCDFRR = _BV(LCDPS0);

//LCD Contrast COntroll Register (hexF=(below)) - Sets maximum volatge to 3.35 V
LCDCCR = _BV(LCDCC3) | _BV(LCDCC2) | _BV(LCDCC1) | _BV(LCDCC0);

// LCD Control and Status Register A (hex80=LCDEN) - Enables LCD Controller/Driver.
LCDCRA = _BV(LCDEN);
}

void init2(void)
//for joystick
{
PORTB = _BV(PINB7) | _BV(PINB6) | _BV(PINB4);
PORTE =_BV(PINE3) | _BV(PINE2);
#define PINB_MASK ((1<<PINB4)|(1<<PINB6)|(1<<PINB7))
#define PINE_MASK ((1<<PINE2)|(1<<PINE3))
#define BUTTON_A 6 // UP
#define BUTTON_B 7 // DOWN
#define BUTTON_C 2 // LEFT
#define BUTTON_D 3 // RIGHT
#define BUTTON_O 4 // PUSH
PCMSK0 = PINE_MASK;
EIMSK = (1<<PCIE0)|(1<<PCIE1);

}

void delay(void)
{
u32 c;
for (c = 0; c < 0xffff; c++);
}

void LCD_Write_Digit( u8 character,u8 character2, u8 character3, u8 character4, u8 character5) //Character arrays to hold write digit letters
{
u32 digit,digit2,digit3,digit4,digit5, number1, number2, number3, number4, number5, number; // setting Digits and numbers to hold array data
u32 mask, LCDDRbase; // Setting mask and LCDDRbase
u8 count, i; // setting coutn and i
u8 *ptr; // setting pointer
LCDDRbase = 0xec; //Setting the LCDDRbase to LCDDR0
mask = 0x000f; //Setting mask

character = character - 0x30; // takes away 30 hex from the character to find its position in the array table
character2 = character2 - 0x30;
character3 = character3 - 0x30;
character4 = character4 - 0x30;
character5 = character5 - 0x30;

ptr = (char *) (LCDDRbase); //0xec is the address of LCDDR0

/* Test to see if odd or even. if even then the upper nibble of
LCDDRx is enabled, if odd then lower nibble enabled */

digit = LCD_character_table [character]; //get character
digit2 = LCD_character_table [character2]; // get second character
digit3 = LCD_character_table [character3]; // get third character
digit4 = LCD_character_table [character4]; // get fourth character
digit5 = LCD_character_table [character5];

for (i = 0; i < 4; i++)
{

number1 = digit & mask; //mask off upper nibble of lcddrx
number2 = digit2 & mask; // mask off upper nibble of lcddrx and sets digit2 to number2
number2=number2<<4; // shifts number 2 to LCD register to the left
number= number1 | number2; // ORS number1 and 2 and sets to number
*ptr = number; //output value to LCDDRx + ptr
ptr+=5; //inctrment to next LCDDRx register
digit=digit>>=4; // moves digit on
digit2=digit2>>=4;// etc

}

LCDDRbase = 0xed;
mask = 0x000f;
ptr = (char *) (LCDDRbase);

for (i = 0; i < 4; i++)
{
number3 = digit3 & mask; //mask off upper nibble of lcddrx
number4 = digit4 & mask;
number4=number4<<4;
number= number3 | number4;
*ptr = number; //output value to LCDDRx + ptr
ptr+=5; //inctrment to next LCDDRx register
digit3=digit3>>=4;
digit4=digit4>>=4;

}

LCDDRbase = 0xee;
mask = 0x000f;
ptr = (char *) (LCDDRbase);

for (i = 0; i < 4; i++)
{
number5 = digit5 & mask; //mask off upper nibble of lcddrx
number= number5;
*ptr = number; //output value to LCDDRx + ptr
ptr+=5; //inctrment to next LCDDRx register
digit5=digit5>>=4;

}

}

main()
{
init();
init2();
while(1)
{
char buttons;
buttons = (~PINB) & PINB_MASK; // setting PINS for UP, DOWN
buttons |= (~PINE) & PINE_MASK;// setting PINS for LEFT, RIGHT

// Output virtual keys
if (buttons &(1<<BUTTON_A))
{
LCD_Write_Digit('N','O','R','T', 'H');//Letters to be sent to be taken from array table.
}

else if (buttons &(1<<BUTTON_B))
{
LCD_Write_Digit('S','O','U','T', 'H');//Letters to be sent to be taken from array table.
}

else if (buttons & (1<<BUTTON_C))
{
LCD_Write_Digit('W','E','S','T', '@');//Letters to be sent to be taken from array table.
}

else if (buttons & (1<<BUTTON_D))
{
LCD_Write_Digit('E','A','S','T', '@');//Letters to be sent to be taken from array table.
}

else if (buttons & (1<<BUTTON_O))
{
LCD_Write_Digit('P','W','N','E', 'D');//Letters to be sent to be taken from array table.
}

else
{
LCD_Write_Digit('@','@','@','@', '@');//Letters to be sent to be taken from array table.
}

}

}

thanks again DDyne

Well that's fantastic, I'm glad you got it to work.

Be sure to drop back and upload you're finished code 'cause now you've got me curious about what you are trying to do.