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| T6963C Graphic LCD display trouble |
 Posted: Tue Dec 20, 2005 2:28 pm |
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Hello.
I am trying to get an 128x64 lcd display based on the T6963C chip to work with an pic16f877
I actually had it working for a while by using some code i found here, but, when i rewired the circut and tested it on a different PIC (16f917), then it suddently stopped working. I have now gone back to the 16f877, but im doing something wrong.... can anyone help?
This is the "driver" that im using:
| Code: |
/////////////////////////////////////////////////////////////////////////
//// ////
//// This file contains drivers for using a Tosiba T6963C controller ////
//// in parallel/8080(intel) mode. The T6963C is 240 pixels across ////
//// and 64 pixels down. The driver treats the upper left pixel 0,0 ////
//// ////
//// Connections are as follows: ////
//// /WR - - C4 ////
//// /RD - - C5 ////
//// C//D- - C6 ////
//// /RST- - C7 ////
//// DATA0-7 PORTD0-7 ////
//// LCD's FS is tied low (FS = 0 is 8x8 font) ////
//// ////
/////////////////////////////////////////////////////////////////////////
// 240 x 64 in the 8x8 font mode means that 30 characters across by
// 8 rows of characters may be displayed
#ifndef GLCD_COL
#define GLCD_COL 128 // Used for text wrapping by glcd_text57 function and sanity check
#endif
#ifndef GLCD_ROW
#define GLCD_ROW 64 // Used for text wrapping by glcd_text57 function and sanity check
#endif
#define set_tris_lcd(x) set_tris_d(x)
#define ON 1
#define OFF 0
#define YES 1
#define NO 0
#define glcd_WriteCmd0(x) glcd_WriteByte(1,x)
#define LCDSetPtr 0x24
#define LCDTxtAdr(x,y) 0x780+(128)+(30*y)+x
//TRIS DataBus=x, note:control bus (PORTC) always outputs
const int16 TextHome = 0x0000;
const int8 TextArea = 0x0010; // how many bytes before a new line
const int16 GraphicsHome = 0x0101;
const int8 GraphicsArea = 0x0010; // how many bytes before a new line
const int8 AutoModeWrite = 0xB0;
const int8 AutoModeRead = 0xB1;
const int8 AutoModeReset = 0xB2;
const int8 LCDModeSet = 0x80; // send this OR'd with the following
const int8 LCDMode_OR = 0b0000;
const int8 LCDMode_XOR = 0b0001;
const int8 LCDMode_AND = 0b0010;
const int8 LCDMode_TA = 0b0100; // TEXT ATTRIBUTE mode.
const int8 LCDMode_RAM = 0b1000; // 1=CG RAM, 0=internal CG ROM
const int8 LCDSetCursorPtr = 0x21; // cursor address
const int8 LCDSetCursorSize = 0xA0; // 1 line cursor
const int8 LCDDispMode = 0x90; // send this OR'd with the following
const int8 LCDDisp_BLK = 0b0001;
const int8 LCDDisp_CUR = 0b0010;
const int8 LCDDisp_TXT = 0b0100;
const int8 LCDDisp_GRH = 0b1000;
const int1 LCDFont = 0;//FS pin has internal pull-up. FS=1 unless grounded
const int8 LCDField = 8; //CAMBIO:8 POR 6 //FS=1 then field=6. FS=0 then field=8
const int8 LCDCharWidth = GLCD_COL /LCDField;
const int16 CharPerScn= LCDCharWidth*16; //CAMBIO: 16 por 8 //number of characters on a screen
struct lcd_pin_def
{
BOOLEAN unused1; // C0
BOOLEAN unused2; // C1
BOOLEAN unused3; // C2
BOOLEAN unused4; // C3
BOOLEAN w_bar; // C4 Write bar active low
BOOLEAN r_bar; // C5 Read bar active low
BOOLEAN cd; // C6 Command/Data BAR 1=command 0=data
BOOLEAN reset_bar; // C7 Reset active low
int data : 8; // PortD=Data bus
};
struct lcd_pin_def LCD;
#byte LCD = 0x07 // portC address on 18F877
int glcd_ReadByte(void);
void glcd_WriteByte(int1 cd, int data);
void glcd_WriteByteAuto(int data);
void glcd_WriteCmd2(int16 data, int cmd);
void glcd_WriteCmd1(int data, int cmd);
void glcd_gotoxy(int x, int y, int1 text);
void glcd_clr(int16 location, int16 size);
int16 ERRORS;
//BOOLEAN glcd_pixel(unsigned int x,unsigned int y, int1 color);
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose: Clears LCD RAM
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
void glcd_clr(int16 location,int16 size)
{
glcd_WriteCmd2(location,LCDSetPtr);
glcd_WriteCmd0(AutoModeWrite);
for (;size;size--)
{
glcd_WriteByteAuto(0x00);//clear ram
}
glcd_WriteCmd0(AutoModeReset);
}
///////////////////////////////////////////////////////////////////////
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose: Turn a pixel on a graphic LCD on or off
// Inputs: x - the x coordinate of the pixel
// y - the y coordinate of the pixel
// color - ON or OFF
// Output: 1 if coordinate out of range, 0 if in range
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
glcd_pixel(int16 x,int16 y, int1 color)
{
int8 r=0,c=0;
c=color;//converting booean to an int8
if (x>=GLCD_COL)
{
bit_set(ERRORS,5);//ERRORS=bit 5. LCD x range exceeded
return (FALSE);
}
if (y>=GLCD_ROW)
{
bit_set(ERRORS,6);//ERRORS=bit 6. LCD y range exceeded
return (FALSE);
}
r=fmod(x,8);
glcd_WriteCmd2(GraphicsHome+(y*16+(x/8)),LCDSetPtr);
glcd_WriteCmd0(0xf0|(c<<3) |(7-r));
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose: Draw a line on a graphic LCD using Bresenham's
// line drawing algorithm
// Inputs: (x1, y1) - the start coordinate
// (x2, y2) - the end coordinate
// color - ON or OFF
// Dependencies: glcd_pixel()
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
void glcd_line(int x1, int y1, int x2, int y2, int1 color)
{
signed int x, y, addx, addy, dx, dy;
signed long P;
int i;
dx = abs((signed int)(x2 - x1));
dy = abs((signed int)(y2 - y1));
x = x1;
y = y1;
if(x1 > x2)
addx = -1;
else
addx = 1;
if(y1 > y2)
addy = -1;
else
addy = 1;
if(dx >= dy)
{
P = 2*dy - dx;
for(i=0; i<=dx; ++i)
{
glcd_pixel(x, y, color);
if(P < 0)
{
P += 2*dy;
x += addx;
}
else
{
P += 2*dy - 2*dx;
x += addx;
y += addy;
}
}
}
else
{
P = 2*dx - dy;
for(i=0; i<=dy; ++i)
{
glcd_pixel(x, y, color);
if(P < 0)
{
P += 2*dx;
y += addy;
}
else
{
P += 2*dx - 2*dy;
x += addx;
y += addy;
}
}
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose: Draw a rectangle on a graphic LCD
// Inputs: (x1, y1) - the start coordinate
// (x2, y2) - the end coordinate
// fill - YES or NO
// color - ON or OFF
// Dependencies: glcd_pixel(), glcd_line()
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
void glcd_rect(int x1, int y1, int x2, int y2, int fill, int1 color)
{
if(fill)
{
int y, ymax; // Find the y min and max
if(y1 < y2)
{
y = y1;
ymax = y2;
}
else
{
y = y2;
ymax = y1;
}
for(; y<=ymax; ++y) // Draw lines to fill the rectangle
glcd_line(x1, y, x2, y, color);
}
else
{
glcd_line(x1, y1, x2, y1, color); // Draw the 4 sides
glcd_line(x1, y2, x2, y2, color);
glcd_line(x1, y1, x1, y2, color);
glcd_line(x2, y1, x2, y2, color);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose: Draw a bar (wide line) on a graphic LCD
// Inputs: (x1, y1) - the start coordinate
// (x2, y2) - the end coordinate
// width - The number of pixels wide
// color - ON or OFF
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
void glcd_bar(int x1, int y1, int x2, int y2, int width, int1 color)
{
signed int x, y, addx, addy, j;
signed long P, dx, dy, c1, c2;
int i;
dx = abs((signed int)(x2 - x1));
dy = abs((signed int)(y2 - y1));
x = x1;
y = y1;
c1 = -dx*x1 - dy*y1;
c2 = -dx*x2 - dy*y2;
if(x1 > x2)
{
addx = -1;
c1 = -dx*x2 - dy*y2;
c2 = -dx*x1 - dy*y1;
}
else
addx = 1;
if(y1 > y2)
{
addy = -1;
c1 = -dx*x2 - dy*y2;
c2 = -dx*x1 - dy*y1;
}
else
addy = 1;
if(dx >= dy)
{
P = 2*dy - dx;
for(i=0; i<=dx; ++i)
{
for(j=-(width/2); j<width/2+width%2; ++j)
{
if(dx*x+dy*(y+j)+c1 >= 0 && dx*x+dy*(y+j)+c2 <=0)
glcd_pixel(x, y+j, color);
}
if(P < 0)
{
P += 2*dy;
x += addx;
}
else
{
P += 2*dy - 2*dx;
x += addx;
y += addy;
}
}
}
else
{
P = 2*dx - dy;
for(i=0; i<=dy; ++i)
{
if(P < 0)
{
P += 2*dx;
y += addy;
}
else
{
P += 2*dx - 2*dy;
x += addx;
y += addy;
}
for(j=-(width/2); j<width/2+width%2; ++j)
{
if(dx*x+dy*(y+j)+c1 >= 0 && dx*x+dy*(y+j)+c2 <=0)
glcd_pixel(x+j, y, color);
}
}
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose: Draw a circle on a graphic LCD
// Inputs: (x,y) - the center of the circle
// radius - the radius of the circle
// fill - YES or NO
// color - ON or OFF
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
void glcd_circle(int x, int y, int radius, int1 fill, int1 color)
{
signed int a, b, P;
a = 0;
b = radius;
P = 1 - radius;
do
{
if(fill)
{
glcd_line(x-a, y+b, x+a, y+b, color);
glcd_line(x-a, y-b, x+a, y-b, color);
glcd_line(x-b, y+a, x+b, y+a, color);
glcd_line(x-b, y-a, x+b, y-a, color);
}
else
{
glcd_pixel(a+x, b+y, color);
glcd_pixel(b+x, a+y, color);
glcd_pixel(x-a, b+y, color);
glcd_pixel(x-b, a+y, color);
glcd_pixel(b+x, y-a, color);
glcd_pixel(a+x, y-b, color);
glcd_pixel(x-a, y-b, color);
glcd_pixel(x-b, y-a, color);
}
if(P < 0)
P+= 3 + 2*a++;
else
P+= 5 + 2*(a++ - b--);
} while(a <= b);
}
void glcd_init(void) {
int16 counter;
set_tris_lcd(0xff); //TRIS DATA bus,note:control bus always outputs
LCD.w_bar = 1; // INITIAL STATES OF CONTROL PINS
LCD.r_bar = 1; //
LCD.cd = 1; // command
LCD.reset_bar = 0; // perform a reset
delay_us(20); // delay for a reset
LCD.reset_bar = 1; // run
// Set up the graphics and text areas
glcd_WriteCmd2(TextHome, 0x40);
glcd_WriteCmd2(TextArea, 0x41);
glcd_WriteCmd2(GraphicsHome, 0x42);
glcd_WriteCmd2(GraphicsArea, 0x43);
// set address to 0
glcd_WriteCmd2(0x0000, 0x24);
glcd_WriteCmd2(0x0000, 0x24);
// Clear all RAM of LCD (8k)
glcd_WriteByte(1, AutoModeWrite);
for (counter = 0; counter < 0x1fff; counter++)
{
glcd_WriteByteAuto(0); // fill everything with zeros
}
glcd_WriteByte(1, AutoModeReset);
}
void glcd_WriteByte(int1 cd, int data)
{
int status = 0, temp = 0;
set_tris_lcd(0xff);
LCD.w_bar = 1;
LCD.r_bar= 1;
LCD.cd = 1;//defaults
while (status != 0x03) { // is LCD busy?
LCD.r_bar= 0;
temp = LCD.data;
LCD.r_bar = 1;
status = temp & 0x03;
}
set_tris_lcd(0x00); // All outputs
LCD.cd = cd; // Command/Data bar
LCD.data = data;
LCD.r_bar = 1; // not read
LCD.w_bar = 0; // write
LCD.w_bar = 1; // release
}
void glcd_WriteByteAuto(int data)
{
int status = 0, temp = 0; // status bits ARE DIFFERENT BITS THAN NORMAL
set_tris_lcd(0xff);
LCD.w_bar = 1;
LCD.r_bar = 1;
LCD.cd = 1; // defaults
while (status != 0x08) { // is LCD busy?
LCD.r_bar = 0;
temp = LCD.data;
LCD.r_bar = 1;
status = temp & 0x08;
}
set_tris_lcd(0x00); // All outputs
LCD.cd = 0; // This is always data, cd=0
LCD.data = data; // Put data on data bus
LCD.w_bar = 0; // write
LCD.w_bar = 1; // release
}
void glcd_WriteCmd1(int data, int cmd)
{
glcd_WriteByte(0, data);
glcd_WriteByte(1, cmd);
}
void glcd_WriteCmd2(int16 data, int cmd)
{
glcd_WriteByte(0, data & 0xff);
glcd_WriteByte(0, data>>8);
glcd_WriteByte(1, cmd);
}
int glcd_ReadByte(void)
{
int data = 0, status = 0, temp = 0;
set_tris_lcd(0xff);
LCD.w_bar = 1;
LCD.r_bar = 1;
LCD.cd = 1; // defaults
#asm nop #endasm
while (status != 0x03) { // is LCD busy?
LCD.r_bar = 0;
temp = LCD.data;
LCD.r_bar = 1;
status = temp & 0x03;
}
LCD.cd = 0; // Command/Data bar
LCD.r_bar = 0; // read
/////////////////////////////////////////////////////////
#asm nop #endasm // THIS PAUSE IS VERY NESSESARY !!!//
/////////////////////////////////////////////////////////
data = LCD.data;
LCD.r_bar = 1;
LCD.cd = 1;
return data; // Return the read data
}
void glcd_putc(char c) {
glcd_WriteCmd1(c - 0x20, 0xc0);
}
void glcd_gotoxy(int x, int y, int1 text) { // sets memory location to screen location x, y
// location 1,1 is upper left corner; text = 1 (text area), text = 0 (graphics area)
int16 location, home;
int line;
if (!text) {
home = GraphicsHome;
line = GraphicsArea;
}
else {
home = TextHome;
line = TextArea;
}
location = home + (((int16)y - 1) * line) + x - 1;
glcd_WriteCmd2(location, 0x24);
}
//////////////////////////////////////////////////////////////////
const BYTE TEXT[51][5] ={ 0x00, 0x00, 0x00, 0x00, 0x00, // SPACE
0x00, 0x00, 0x5F, 0x00, 0x00, // !
0x00, 0x03, 0x00, 0x03, 0x00, // "
0x14, 0x3E, 0x14, 0x3E, 0x14, // #
0x24, 0x2A, 0x7F, 0x2A, 0x12, // $
0x43, 0x33, 0x08, 0x66, 0x61, // %
0x36, 0x49, 0x55, 0x22, 0x50, // &
0x00, 0x05, 0x03, 0x00, 0x00, // '
0x00, 0x1C, 0x22, 0x41, 0x00, // (
0x00, 0x41, 0x22, 0x1C, 0x00, // )
0x14, 0x08, 0x3E, 0x08, 0x14, // *
0x08, 0x08, 0x3E, 0x08, 0x08, // +
0x00, 0x50, 0x30, 0x00, 0x00, // ,
0x08, 0x08, 0x08, 0x08, 0x08, // -
0x00, 0x60, 0x60, 0x00, 0x00, // .
0x20, 0x10, 0x08, 0x04, 0x02, // /
0x3E, 0x51, 0x49, 0x45, 0x3E, // 0
0x04, 0x02, 0x7F, 0x00, 0x00, // 1
0x42, 0x61, 0x51, 0x49, 0x46, // 2
0x22, 0x41, 0x49, 0x49, 0x36, // 3
0x18, 0x14, 0x12, 0x7F, 0x10, // 4
0x27, 0x45, 0x45, 0x45, 0x39, // 5
0x3E, 0x49, 0x49, 0x49, 0x32, // 6
0x01, 0x01, 0x71, 0x09, 0x07, // 7
0x36, 0x49, 0x49, 0x49, 0x36, // 8
0x26, 0x49, 0x49, 0x49, 0x3E, // 9
0x00, 0x36, 0x36, 0x00, 0x00, // :
0x00, 0x56, 0x36, 0x00, 0x00, // ;
0x08, 0x14, 0x22, 0x41, 0x00, // <
0x14, 0x14, 0x14, 0x14, 0x14, // =
0x00, 0x41, 0x22, 0x14, 0x08, // >
0x02, 0x01, 0x51, 0x09, 0x06, // ?
0x3E, 0x41, 0x59, 0x55, 0x5E, // @
0x7E, 0x09, 0x09, 0x09, 0x7E, // A
0x7F, 0x49, 0x49, 0x49, 0x36, // B
0x3E, 0x41, 0x41, 0x41, 0x22, // C
0x7F, 0x41, 0x41, 0x41, 0x3E, // D
0x7F, 0x49, 0x49, 0x49, 0x41, // E
0x7F, 0x09, 0x09, 0x09, 0x01, // F
0x3E, 0x41, 0x41, 0x49, 0x3A, // G
0x7F, 0x08, 0x08, 0x08, 0x7F, // H
0x00, 0x41, 0x7F, 0x41, 0x00, // I
0x30, 0x40, 0x40, 0x40, 0x3F, // J
0x7F, 0x08, 0x14, 0x22, 0x41, // K
0x7F, 0x40, 0x40, 0x40, 0x40, // L
0x7F, 0x02, 0x0C, 0x02, 0x7F, // M
0x7F, 0x02, 0x04, 0x08, 0x7F, // N
0x3E, 0x41, 0x41, 0x41, 0x3E, // O
0x7F, 0x09, 0x09, 0x09, 0x06, // P
0x1E, 0x21, 0x21, 0x21, 0x5E, // Q
0x7F, 0x09, 0x09, 0x09, 0x76};// R
const BYTE TEXT2[44][5]={ 0x26, 0x49, 0x49, 0x49, 0x32, // S
0x01, 0x01, 0x7F, 0x01, 0x01, // T
0x3F, 0x40, 0x40, 0x40, 0x3F, // U
0x1F, 0x20, 0x40, 0x20, 0x1F, // V
0x7F, 0x20, 0x10, 0x20, 0x7F, // W
0x41, 0x22, 0x1C, 0x22, 0x41, // X
0x07, 0x08, 0x70, 0x08, 0x07, // Y
0x61, 0x51, 0x49, 0x45, 0x43, // Z
0x00, 0x7F, 0x41, 0x00, 0x00, // [
0x02, 0x04, 0x08, 0x10, 0x20, // \
0x00, 0x00, 0x41, 0x7F, 0x00, // ]
0x04, 0x02, 0x01, 0x02, 0x04, // ^
0x40, 0x40, 0x40, 0x40, 0x40, // _
0x00, 0x01, 0x02, 0x04, 0x00, // `
0x20, 0x54, 0x54, 0x54, 0x78, // a
0x7F, 0x44, 0x44, 0x44, 0x38, // b
0x38, 0x44, 0x44, 0x44, 0x44, // c
0x38, 0x44, 0x44, 0x44, 0x7F, // d
0x38, 0x54, 0x54, 0x54, 0x18, // e
0x04, 0x04, 0x7E, 0x05, 0x05, // f
0x08, 0x54, 0x54, 0x54, 0x3C, // g
0x7F, 0x08, 0x04, 0x04, 0x78, // h
0x00, 0x44, 0x7D, 0x40, 0x00, // i
0x20, 0x40, 0x44, 0x3D, 0x00, // j
0x7F, 0x10, 0x28, 0x44, 0x00, // k
0x00, 0x41, 0x7F, 0x40, 0x00, // l
0x7C, 0x04, 0x78, 0x04, 0x78, // m
0x7C, 0x08, 0x04, 0x04, 0x78, // n
0x38, 0x44, 0x44, 0x44, 0x38, // o
0x7C, 0x14, 0x14, 0x14, 0x08, // p
0x08, 0x14, 0x14, 0x14, 0x7C, // q
0x00, 0x7C, 0x08, 0x04, 0x04, // r
0x48, 0x54, 0x54, 0x54, 0x20, // s
0x04, 0x04, 0x3F, 0x44, 0x44, // t
0x3C, 0x40, 0x40, 0x20, 0x7C, // u
0x1C, 0x20, 0x40, 0x20, 0x1C, // v
0x3C, 0x40, 0x30, 0x40, 0x3C, // w
0x44, 0x28, 0x10, 0x28, 0x44, // x
0x0C, 0x50, 0x50, 0x50, 0x3C, // y
0x44, 0x64, 0x54, 0x4C, 0x44, // z
0x00, 0x08, 0x36, 0x41, 0x41, // {
0x00, 0x00, 0x7F, 0x00, 0x00, // |
0x41, 0x41, 0x36, 0x08, 0x00, // }
0x02, 0x01, 0x02, 0x04, 0x02};// ~
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose: Write text on a graphic LCD
// Inputs: (x,y) - The upper left coordinate of the first letter
// textptr - A pointer to an array of text to display
// size - The size of the text: 1 = 5x7, 2 = 10x14, ...
// color - ON or OFF
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
void glcd_text57(int x, int y, char* textptr, int size, int1 color)
{
const BYTE bytes_per_char=5;
int i, j, k, l, m; // Loop counters
BYTE pixelData[bytes_per_char]; // Stores character data
for(i=0; textptr[i] != '\0'; ++i, ++x) // Loop through the passed string
{
if(textptr[i] < 'S') // Checks if the letter is in the first or second array
memcpy(pixelData, TEXT[textptr[i]-' '], bytes_per_char);
else if(textptr[i] <= '~') // Check if the letter is in the second array
memcpy(pixelData, TEXT2[textptr[i]-'S'], bytes_per_char);
else
memcpy(pixelData, TEXT[0], bytes_per_char); // Default to space
if(x+5*size >= GLCD_COL) // Performs character wrapping
{
x = 0; // Set x at far left position
y += 7*size + 1; // Set y at next position down
}
for(j=0; j<bytes_per_char; ++j, x+=size) // 5 bytes per character
{
for(k=0; k<7*size; ++k) // Loop through the vertical pixels
{
if(bit_test(pixelData[j], k)) // Check if the pixel should be set
{
for(l=0; l<size; ++l) // The next two loops change the
{ // character's size
for(m=0; m<size; ++m)
{
glcd_pixel(x+m, y+k*size+l, color); // Draws the pixel
}
}
}
}
}
}
}
|
And this is the main:
| Code: | #include <16F877A.H>
#fuses XT,NOBROWNOUT,NOWDT,NOPROTECT
#use delay (clock=4000000)
#include "math.h"
#include "glcd.c"
#use fast_io(D)
void main() {
while(true)
{
output_high(pin_a1);
delay_ms(1000);
output_low(pin_a1);
delay_ms(1000);
set_tris_c(0x00); // graphic lcd control lines all output
glcd_init();
glcd_WriteByte(1, (LCDModeSet|LCDMode_XOR));
glcd_WriteByte(1, (LCDDispMode|LCDDisp_TXT|LCDDisp_GRH));
glcd_gotoxy(3,2,1);
glcd_putc("Hello");
}
}
|
The "output_high(pin_a1);" part is just to check if the pic is up and running. When i connect a mulitmeter to pin_a1 it goes high and then low. But then it stops. If i remove the lcd initialization routine, then it works..(pin_a1 high and low evey second) So the pic hangs somewhere..
Really need some help here...
Thanks in advance
LTS |
|
 |
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Tue Dec 20, 2005 3:11 pm |
|
|
A few obvious comments:
1. Are you using a Low Voltage programmer ? If not, add NOLVP
to the end of the #fuses statement. Programmers such as
PicStart-Plus, ICD2, CCS ICD, Warp-13a and MachX are High Voltage
programmers, and the NOLVP setting should be used with them.
2. You have placed the "#use fast_io(D)" statement after the
#include "glcd.c" statement. This means that the LCD driver
will not use fast i/o. Remember, the fast_io() statement only
applies to code that comes after it in the file.
See the corrections shown below:
| Quote: | #include <16F877A.H>
#fuses XT,NOBROWNOUT,NOWDT,NOPROTECT, NOLVP
#use delay (clock=4000000)
#include "math.h"
#use fast_io(D)
#include "glcd.c"
void main() {
while(true)
{
output_high(pin_a1);
delay_ms(1000);
output_low(pin_a1);
delay_ms(1000);
set_tris_c(0x00); // graphic lcd control lines all output
glcd_init();
glcd_WriteByte(1, (LCDModeSet|LCDMode_XOR));
glcd_WriteByte(1, (LCDDispMode|LCDDisp_TXT|LCDDisp_GRH));
glcd_gotoxy(3,2,1);
glcd_putc("Hello");
} |
|
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LTS
Joined: 08 Dec 2005
Posts: 8
|
|
| Posted: Tue Dec 20, 2005 3:23 pm |
|
|
Hello
Thanks for suggestions, but it didn't change anything.. The LCD shows nothing... i can change contrast and everything but no text appears....What could cause the pic to hang in the lcd routine?? |
|
|
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Tue Dec 20, 2005 4:10 pm |
|
|
You need to determine what line of code is causing the program to hang.
If you have a debugger such as ICD2, you can click on the Run button
and then after it's apparent that the program is hanging, you can click
on the halt button. In MPLAB a green arrow will point to the line of
C source code where the program is hanging.
If you don't have a debugger, you can use putc() statements to track
the progress of your code, and to show where it hangs. See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=21949&highlight=putc |
|
|
treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
|
|
| Posted: Tue Dec 20, 2005 4:33 pm |
|
|
This driver was based on work I did. So I am familiar with it.
Try something simple. init.
Do 1 init filling with 0x00 and wait 1sec and do another filling with 0xFF.
If that doesn't work check the timing of the #asm noop #endasm.
Also double check your ports. Looks like you want to use the port C.
But there is a #define that sets the tris and its using D.
And in main your using fastio on D.
Double check the ports. |
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LTS
Joined: 08 Dec 2005
Posts: 8
|
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| Posted: Tue Dec 20, 2005 5:44 pm |
|
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| I've triple checked the wires several times, but now i resoldered everything with new wires... and guess what.. IT WORKS! great. Thanks! |
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