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newbie4life
Joined: 18 Dec 2006
Posts: 2
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| cfag12232d graphic lcd |
 Posted: Thu Jan 11, 2007 5:44 pm |
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Version of your compiler: 4.020
Target PIC Microcontroller (PIC16F877, 18F452, etc): PicDem2 Plus 18F4520
Standard Run Mode or Debug Mode: standard
Target voltage (5V, 3.3V, etc): 9V
Target oscillator speed, type (20Mhz, RC, Strip Cut, etc): 24MHz
I toggled all the pins to see if the wiring was correct, and it is. Also ohmed it out. I only get garbage on the lcd. Here is the source code. Free for download from www.picmodules.com I've made modifications to it, but it doesn't seem to work.
If anyone could help, I would appreciate it. Hopefully someone can see the error, and/or has used this similar device. Any advice/comments is welcomed! Thanks.
Main.C
| Code: |
//****************************************************************
// TITLE: MAIN.C
// DATE: 04 DEC 05
// BY: JV
// DESCRIPTION: Main project file for SED1520 ddemo applicatiton
//----------------------------------------------------------------
// Revision: V1.0 (first release)
//****************************************************************
// Select a Processor
// Note: Default is setup for 16F877A processor
//#define _16F877A // Un-comment the micro
#define _18F4520 // that you are using
//#define _18F4620 // make sure all others
// are commented out
#ifdef _16F877A
#include <16f877a.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#endif
#ifdef _18F4520
#include <18f4520.h>
#fuses HS,NOWDT,NOLVP,NOBROWNOUT,NOLPT1OSC,NOXINST,NOFCMEN,NOIESO,NOPBADEN
#endif
#ifdef _18F4620
#include <18f4620.h>
#fuses HS,NOWDT,NOLVP,NOBROWNOUT,NOLPT1OSC,NOXINST,NOFCMEN,NOIESO,NOPBADEN
#endif
//#device ICD=TRUE
#use delay(clock=24,000,000)
#define FAST_GLCD // Graphics.c driver
#include "graphics.c" // Graphics.c driver
#include <math.h> // Graphics.c driver
// Some test text for displaying on the LCD display
char TestText[] = "PICCore",
TestText2[] = "SED1520 LCD on a ...";
//=================================================================
// The main application
//=================================================================
void main()
{
int8 i,j,k;
InitSED1520(); // Initialise the SED1520 controllers
// Clear the display RAM first--------------//
for (k=0;k<2;k++) // Clear both controlers data
{
SIDE=k;
for (j=0;j<4;j++) // Now go through all pages
{ // and clear the LCD RAM
LCDCWrite(184+j); // so that the display is cleared
LCDCWrite(0);
for (i=0;i<62;i++) LCDWrite(0x00);
}
}
//------------------------------------------//
// Turn on BL
output_low(PIN_C2);
/*
glcd_rect(5,30,10,10,NO,ON); // Draw some rectangles
glcd_rect(5,30,10,22,YES,ON);
glcd_rect(12,30,17,10,NO,ON);
glcd_rect(12,30,17,14,YES,ON);
glcd_rect(19,30,24,10,NO,ON);
glcd_rect(19,30,24,23,YES,ON);
glcd_rect(26,30,31,10,NO,ON);
glcd_rect(26,30,31,16,YES,ON);
*/
glcd_text57(2, 2, TestText2, 1, ON); // Display some text on the LCD
glcd_text57(40, 12, TestText, 2, ON); // Display some text on the LCD
//glcd_line(35,27,122,27,ON); // then some lines
//glcd_line(35,29,122,29,ON);
while(1); // ...and stop
}//End Main
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sed1520lcd.c
| Code: |
//****************************************************************
// TITLE: SED1520LCD.C
// DATE: 04 DEC 05
// BY: JV
// DESCRIPTION: SED1520 code for CCS graphics
// driver
//----------------------------------------------------------------
// Revision: V1.0 (first release)
//****************************************************************
// PICCore Pin definitions----------//
#define LCD_RES PIN_A0 // LCD reset pin
#define LCD_CS1 PIN_E1 // Enable Left Side of LCD
#define LCD_CS2 PIN_E2 // Enable Right Side of LCD
#define LCD_RW PIN_C1 // Read/Write
#define LCD_A0 PIN_C0 // Control or Data
#define LCD_BL PIN_C2 // LCD B/L
#define B0 PIN_B0 // Databus 0
#define B1 PIN_B1 // Databus 1
#define B2 PIN_B2 // Databus 2
#define B3 PIN_B3 // Databus 3
#define B4 PIN_B4 // Databus 4
#define B5 PIN_B5 // Databus 5
#define B6 PIN_B6 // Databus 6
#define B7 PIN_B7 // Databus 7
// Tell CCS Graphics.c how big the display is
#define GLCD_WIDTH 122 // Number of Horizontal pixels
#define GLCD_HEIGHT 32 // Number of Vertical Pixels
#define LEFT 1
#define RIGHT 0
// Global Variables for this application (LCD)
int SIDE; // Left or Right side of LCD
// Function Prototype for CCS Graphics.c driver
void glcd_pixel(int8, int8, int1); // Required for CCS GRAPHICS.C
//===============================================================
// command_write (Cdata)
// Write command data to the LCD
// See SED1520 datasheet for more info
//===============================================================
void LCDCWrite(int8 CData) // Write Instruction to LCD
{
if (SIDE==LEFT)
{
OUTPUT_LOW(LCD_A0); // Instruction (not display data)
OUTPUT_LOW(LCD_RW); // We are going to WRITE Data
OUTPUT_LOW(LCD_CS1); // CS Low on the LEFT side of the display
delay_cycles(10);
OUTPUT_HIGH(LCD_CS1); // CS High (starts cycle)
OUTPUT_B(CData); // Put the data on the bus
delay_cycles(2);
OUTPUT_LOW(LCD_CS1); // Latch the data into the LCD
delay_cycles(2);
}
else // The RIGHT hand side
{
OUTPUT_LOW(LCD_A0); // Instruction (not display data)
OUTPUT_LOW(LCD_RW); // We are going to WRITE Data
OUTPUT_LOW(LCD_CS2); // CS Low on the RIGHT side of the display
delay_cycles(10);
OUTPUT_HIGH(LCD_CS2); // CS High (starts cycle)
OUTPUT_B(CData); // Put the data on the bus
delay_cycles(2);
OUTPUT_LOW(LCD_CS2); // Latch the data into the LCD
delay_cycles(2);
}
}
//===============================================================
// Data write (DData)
// Writes display data to the LCD
//===============================================================
void LCDWrite(int8 DData) // Write Data to LCD
{
OUTPUT_HIGH(LCD_A0); // Data (not instruction)
OUTPUT_LOW(LCD_RW); // We are going to WRITE Data
if(SIDE==LEFT)OUTPUT_LOW(LCD_CS1); // If Left side then use CS1
if(SIDE==RIGHT)OUTPUT_LOW(LCD_CS2); // If Right side then use CS2
delay_cycles(2);
if(SIDE==LEFT) OUTPUT_HIGH(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_HIGH(LCD_CS2);
OUTPUT_B(DData); // Put the data onto the bus
delay_cycles(10);
if(SIDE==LEFT) OUTPUT_LOW(LCD_CS1); // and latch the data into
if(SIDE==RIGHT) OUTPUT_LOW(LCD_CS2); // the LCD display
delay_cycles(2);
}
//===============================================================
// Display data read
// Reads the display data pointed to by the page, column and
// chip select. Returns the data.
//===============================================================
int8 LCDRead() // Read Data from LCD
{
int8 DData;
if(SIDE==LEFT) OUTPUT_HIGH(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_HIGH(LCD_CS2);
OUTPUT_HIGH(LCD_A0); // Data
OUTPUT_HIGH(LCD_RW); // Read Data
if(SIDE==LEFT)OUTPUT_LOW(LCD_CS1);
if(SIDE==RIGHT)OUTPUT_LOW(LCD_CS2);
delay_cycles(2);
set_tris_b(0xff); // Allow LCD to drive the data lines
if(SIDE==LEFT) OUTPUT_HIGH(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_HIGH(LCD_CS2);
delay_cycles(50);
DData=INPUT_B(); // Get the data
if(SIDE==LEFT) OUTPUT_LOW(LCD_CS1);
if(SIDE==RIGHT) OUTPUT_LOW(LCD_CS2);
delay_cycles(2);
return(DData);
}
//===============================================================
// Draw a single pixel
// This is required by the Graphics.c driver file provided by
// CCS. It tells the driver how to draw a single pixel anywhere
// on the LCD display
// x=1 to 122 y=1 to 32 color=1=ON color=0=OFF
//===============================================================
void glcd_pixel(int8 x, int8 y, int1 color)
{
int8 ucMask;
int8 i;
int8 Data;
// Which side of the display (which SED1520 controller)
if (x<61>8)y-=((Data-184)*8); // y should always be 1-8
// Horizontal position (column)
if (x>=62) // x should always be 0-61
x-=61; // for each half of the LCD
x-=1; //
LCDCWrite(x); // Go to column 'x'
LCDCWrite(0xe0); // Start R-M-Write operation
LCDRead(); // Dummy Read
Data = LCDRead(); // Read LCD dissplay data
ucMask = 1; // Create a bit mask of the
for (i=1;i<y;i++) // pixel to change
ucMask<<=1; //
if (color) Data|=ucMask; // Set or clear the pixel as
else Data&=~ucMask; // requested
LCDWrite(Data);
LCDCWrite(0xee); // End R-M-Write operation
}
//===================================================================
// Initialise the SED11520 controllers
// for the display type we are using
//===================================================================
void InitSED1520()
{
int8 i;
set_tris_b(0x00);
set_tris_e(0xF8);
set_tris_c(0xF8);
// Setup both SED1520 ccontrollers
for (i=0;i<2;i++)
{
SIDE=i;
LCDCWrite(0xaf); // Turn on the display
LCDCWrite(0xa4); // Static drive is off
LCDCWrite(0xa9); // Duty cycle is set to 1/32
LCDCWrite(0xe2); // Reset the chip
LCDCWrite(0xa0); // Set ADC
LCDCWrite(0xee); // Read modify write disabled
LCDCWrite(0xc0); // Set the start position to
LCDCWrite(0xb8); // the top left of the display
LCDCWrite(0x00); // in column 0
}
OUTPUT_LOW(LCD_CS1); // De-select each side to start
OUTPUT_LOW(LCD_CS2); //
delay_ms(60);
}
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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Thu Jan 11, 2007 5:56 pm |
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Just a shot in the dark,.. but the delay_cycles in the driver can be a sort of a got ya. That is because your clock may not be the same as my clock. replace the delay_cycles with a delay_ms(200)
thats a big number, and can be changed to something resonable if it fixes anything. |
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newbie4life
Joined: 18 Dec 2006
Posts: 2
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| Posted: Thu Jan 11, 2007 6:29 pm |
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| Hi, thanks for the input, but yeah, that was one of the first things I've tried. |
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