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buckeyes1997
Guest
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| problems getting lcd420.c to work |
 Posted: Thu Dec 16, 2004 7:07 pm |
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well ive been using the CCS lcd.c driver but wanted to actually try using all 4 lines of my lcd so i started a new project for my 16f628 using the lcd420.c and then four lcd_putc("blah") lines with the last three having \n to goto a new line. i get a blank lcd when i run the program.
here is the code:
| Code: | #include "C:\Documents and Settings\Administrator\My Documents\microcontroller\16f628\lcd420.h"
// #include <math.h>
#include <stdio.h>
//#include <stddef.h>
//#include <stdlib.h>
#include <lcd420.c>
void main()
{
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2(T2_DIV_BY_1,255,1);
setup_ccp1(CCP_OFF);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
lcd_init();
while(1){
delay_ms(10);
lcd_putc("this is");
lcd_putc("\na test of");
lcd_putc("\nall four");
lcd_putc("\nlines!!!!!");
}
}
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Re: problems getting lcd420.c to work |
| Posted: Thu Dec 16, 2004 9:44 pm |
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| Code: | #include "C:\Documents and Settings\Administrator\My Documents\microcontroller\16f628\lcd420.h"
// #include <math.h>
#include <stdio.h>
//#include <stddef.h>
//#include <stdlib.h>
#include <lcd420.c>
void main()
{
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2(T2_DIV_BY_1,255,1);
setup_ccp1(CCP_OFF);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
lcd_init();
while(1){
delay_ms(10);
lcd_putc("\fthis is");
lcd_putc("\na test of");
lcd_putc("\nall four");
lcd_putc("\nlines!!!!!");
}
}
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I don't know why you continually write the data to the display but I would put a \f in there to make sure it starts from the begining each time. Does the LCD.C file work for you? |
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buckeyes1997
Guest
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| Posted: Thu Dec 16, 2004 10:20 pm |
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yes the lcd.c file works fine for the two lines. i looked thru the 420 driver and it looks to be a drop in replacement right? when i try to use the 420 version i get a completely blank screen without anything at all.
why do i keep displaying the same thing over and over?? haha cuz im not a very good programmer....yet.
thanks mark |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Fri Dec 17, 2004 8:37 am |
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They are pretty much the same except for two functions.
| Code: |
void lcd_gotoxy( BYTE x, BYTE y) {
BYTE address;
switch(y) {
case 1 : address=0x80;break;
case 2 : address=0xc0;break;
case 3 : address=0x94;break;
case 4 : address=0xd4;break;
}
address+=x-1;
lcd_send_byte(0,address);
}
void lcd_putc( char c) {
switch (c) {
case '\f' : lcd_send_byte(0,1);
lcdline=1;
delay_ms(2);
break;
case '\n' : lcd_gotoxy(1,++lcdline); break;
case '\b' : lcd_send_byte(0,0x10); break;
default : lcd_send_byte(1,c); break;
}
}
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Try replacing these 2 functions in your LCD.C file and see if it works.
| Code: |
void lcd_gotoxy( BYTE x, BYTE y) {
BYTE address;
// Make sure we have a valid line
if (y>4)
y=1;
// Need to make sure we update the lcdline for the next \n
lcdline = y;
switch(y) {
case 1:
address=0x80;
break;
case 2:
address=0xc0;
break;
case 3:
address=0x94;
break;
case 4:
address=0xd4;
break;
}
address+=x-1;
lcd_send_byte(0,address);
}
void lcd_putc( char c) {
switch (c) {
case '\f' : lcd_send_byte(0,1);
lcdline=1;
delay_ms(2);
break;
case '\n' : lcd_gotoxy(1,++lcdline); break;
case '\b' : lcd_send_byte(0,0x10); break;
default : lcd_send_byte(1,c); break;
}
} |
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