LC-Display sendet seltsame Daten

[robo-sebi]

Hallo,

mit dem PIC16F887 steuer ich ein Graphik-LCD an (http://www.tigal.com/files/download/mikroe/glcd128x64.pdf).

Die Punktansteuerung funktioniert auch ohne weiteres. Doch wenn ich eine Page auslesen möchte, liefert das Display völlig falsche Werte.
So sendet das Display 1 statt 2 als Bytewert (also immer um eins versetzt):

Hier ist meine Readfunktion:

char read(){
TDB = 0xFF; //Databus-Pins: Input
RS = 1; //Control-wires: RS: H ; R/W: H
RW = 1;
Delay_ms(1); //Wait 1 ms
E = 1; //ENABLE: H
Delay_ms(5); //Wait 5 ms
input = DB; //Read Databus
E = 0; //ENABLE: L
RS = 0;
RW = 0;
Delay_ms(1); //Wait 1 ms
TDB = 0; //Databus-Pins: Output
DB = 0; //Control-wires: RS: L / R/W: L / Databus: L

return input;
}

Mache ich irgendwelche Dinge falsch?

MfG Sebastian

[robo-sebi]

Hallo,

ich habe das Problem gefunden. Hier nochmal mein kompletter Code für EasyPIC6 - GLCD:
main.c

#include "glcd.h"
int q = 0;

void main() {
ANSEL = 0; // Configure AN pins as digital
ANSELH = 0;
C1ON_bit = 0; // Disable comparators
C2ON_bit = 0;
glcd_init();
glcd_delete_display();
while(1)
{
glcd_draw_point(68,q,1);
q = q+1;
Delay_ms(500);
if(q == 63){
q = 0;

}
}

while(1);//Endlosschleife

}
glcd.c

#include "glcd.h"
char page = 0;
char b = 0;
char n = 0;
char input = 0;
void glcd_init(){
/*Initialize the display.*/
Delay_ms(250);
TCS1 = 0; //Pin: output
TCS2 = 0;
TRS = 0;
TRW = 0;
TE = 0;
TDB = 0;
//Values:
CSE = 0;
CSZ = 0;
RS = 0;
RW = 0;
E = 0;
DB = 0;
glcd_display_select(1);//Choose IC1
glcd_display_off();
glcd_display_on();
glcd_display_select(2);//Choose IC2
glcd_display_off();
glcd_display_on();

}
void glcd_draw_point(char x, char y, char filled){
/*
x : x-chord
y: y-chord
filled: 1: filled or 0: unfilled
*/
page = y / 8;
b = glcd_read_page(x, page);
n = page * 8;
n = y - n;
n = 1 << n;
if(filled > 0 ){
glcd_draw(x, page, (b | n));
}else{
n = !n;
glcd_draw(x, page, (b & n));
}

}

void glcd_display_select(char controller){
/*Chip select*/
if(controller == 1){
CSE = 0;
CSZ = 1;
}else{
CSE = 1;
CSZ = 0;
}
}
void glcd_draw(char x, char page, char byte){
/*Write byte to DDRAM(x |page).*/
if(x>=64){
glcd_display_select(2);
glcd_setAddress(x-64);
}else{
glcd_display_select(1);
glcd_setAddress(x);
}
glcd_setPage(page);
glcd_write(byte);
}
void glcd_display_off(){
/*Switch the display off*/
RS = 0;
RW = 0;
DB = 62;
glcd_execute();
}
void glcd_display_on(){
/*Switch the display on*/
RS = 0;
RW = 0;
DB = 63;
glcd_execute();
}
void glcd_execute(){
//Executes the comand on DB
E = 1;
//Delay_ms(0);
E = 0;
Delay_ms(1);
}
void glcd_setAddress(char address){
//Set the Address in DDRAM
RS = 0;
RW = 0;
DB = 64 + address;
glcd_execute();
}
void glcd_setPage(char page){
//Set the Page in DDRAM
RS = 0;
RW = 0;
DB = 184 + page;
glcd_execute();
}
void glcd_write(char byte){
//Write byte into the display
DB = byte;
RS = 1;
RW = 0;
glcd_execute();
}
void glcd_delete_display(){
//Delete all points
b = 0;
while(b < 8){
n = 0;
while(n < 128){
glcd_draw(n, b, 0);
n++;
}
b++;
}
}
char glcd_read_page(char x, char page){
//Returns read page
if(x>=64){
glcd_display_select(2);
glcd_setAddress(x-64);
}else{
glcd_display_select(1);
glcd_setAddress(x);
}
glcd_setPage(page);
return glcd_read();
}
char glcd_read(){
//Read the ddram
TDB = 0xFF; //Databus-Pins: Input
RS = 1; //Control-wires: RS: H / R/W: H
RW = 1;
E = 1; ///Dummy-Read
Delay_ms(1); //Wait 1 ms
E = 0;
Delay_ms(1); //Wait 1 ms
Delay_ms(1); //Wait 1 ms
E = 1; //ENABLE: H
Delay_ms(1); //Wait 1 ms
input = DB; //Read Databus
E = 0; //ENABLE: L
RS = 0;
RW = 0;
TDB = 0; //Databus-Pins: Output

return input;
}
glcd.h:
#define TCS1 TRISB.F0
#define TCS2 TRISB.F1
#define TRS TRISB.F2
#define TRW TRISB.F3
#define TE TRISB.F4
#define TDB TRISD
#define TRST TRISB.F5
#define CSE PORTB.F0
#define CSZ PORTB.F1
#define RS PORTB.F2
#define RW PORTB.F3
#define E PORTB.F4
#define DB PORTD
#define RST PORTB.F5

void glcd_init();
void glcd_draw_point(char x, char y, char filled);
void glcd_draw(char x, char page, char byte);
void glcd_display_select(char controller);
void glcd_display_on();
void glcd_display_off();
void glcd_execute();
void glcd_setAddress(char address);
void glcd_setPage(char page);
void glcd_write(char byte);
void glcd_delete_display();
char glcd_read();
char glcd_read_page(char x, char page);

MfG Sebastian