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LCD&hd44780 don't run with driver <lcd.c> and 16F8

 
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nanard-bis
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LCD&hd44780 don't run with driver <lcd.c> and 16F8
PostPosted: Fri Jan 24, 2003 9:14 am     Reply with quote

Hello,

I connect PORT D 16lf877 at lcd(HD44780)
and the ttl signal d7...d4 is not clear
with the scope. A peak appear on 0v and 5V
when i use the driver #include<lcd.c>.
I don't know why this configuration don't run
(16lf877,port d , mode 4 bit for the hd44780)
my code.
Thank you for you help

#include <16F877.H>
#device PIC16F877 10 bit ADC=10/*declaration pour lire ADRESH et ADRESL*/
#use delay (clock=1500000)/*declare le quartz du µc*/
#include <lcd.c>
main()
{
do
{
lcd_init();
delay_ms(2000);
lcd_putc("\fReady");
delay_ms(2000);
}
while( 1 );
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 10967
PCM programmer



Joined: 06 Sep 2003
Posts: 20257

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Re: LCD&hd44780 don't run with driver <lcd.c> and
PostPosted: Fri Jan 24, 2003 4:52 pm     Reply with quote

:=Hello,
:=
:=I connect PORT D 16lf877 at lcd(HD44780)
:=and the ttl signal d7...d4 is not clear
:=with the scope. A peak appear on 0v and 5V
:=when i use the driver #include<lcd.c>.
:=I don't know why this configuration don't run
:=(16lf877,port d , mode 4 bit for the hd44780)
:=my code.
--------------------------------------------------------
I assume you're working with the board member called "isa".
He posted a modified version of the CCS lcd.c file here:
<a href="http://www.pic-c.com/forum/general/posts/10948.html" TARGET="_blank">http://www.pic-c.com/forum/general/posts/10948.html</a>

He has changed the file in several places, from
"set_tris_b()" to "set_tris_d()". That's OK.

But he forgot to change a very important line.
He left this line unchanged:

#byte lcd = 6 // This puts the entire structure
// on to port B (at address 6)

He should change it to be:

#byte lcd = 8 // This puts the entire structure
// on to port D (at address 8)

So if you are working with ISA, then I assume you will
have the same error in your file. If you fix it, it
should work.
___________________________
This message was ported from CCS's old forum
Original Post ID: 10981
nanard-bis
Guest







Re: LCD&hd44780 don't run with driver <lcd.c> and
PostPosted: Mon Jan 27, 2003 7:53 am     Reply with quote

I don't understand it' s don't work.
Nothing appear.
my code

#include <16F877.H>
#device PIC16F877 10 bit ADC=10/*declaration pour lire ADRESH et ADRESL*/
#use delay (clock=4000000)/*declare le quartz du µc*/
#include <lcd.c>

main()
{
do
{
lcd_init();
delay_ms(100);
lcd_putc('A');
delay_ms(100);
}
while( 1 );
}

and lcd.c modify for port d

// As defined in the following structure the pin connection is as follows:
// D0 enable
// D1 rs
// D2 rw
// D4 D4
// D5 D5
// D6 D6
// D7 D7
//
// LCD pins D0-D3 are not used and PIC D3 is not used.

// Un-comment the following define to use port B
// #define use_portb_lcd TRUE


struct lcd_pin_map { // This structure is overlayed
boolean enable; // on to an I/O port to gain
boolean rs; // access to the LCD pins.
boolean rw; // The bits are allocated from
boolean unused; // low order up. ENABLE will
int data : 4; // be pin B0.
} lcd;




#byte lcd = 8 // on to port D (at address 8)



#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40 // LCD RAM address for the second line


byte CONST LCD_INIT_STRING[4] = {0x20 | (lcd_type << 2), 0xc, 1, 6};
// These bytes need to be sent to the LCD
// to start it up.


// The following are used for setting
// the I/O port direction register.

STRUCT lcd_pin_map const LCD_WRITE = {0,0,0,0,0}; // For write mode all pins are out
STRUCT lcd_pin_map const LCD_READ = {0,0,0,0,15}; // For read mode data pins are in




byte lcd_read_byte() {
byte low,high;
set_tris_d(LCD_READ);
lcd.rw = 1;
delay_cycles(1);
lcd.enable = 1;
delay_cycles(1);
high = lcd.data;
lcd.enable = 0;
delay_cycles(1);
lcd.enable = 1;
delay_us(1);
low = lcd.data;
lcd.enable = 0;
set_tris_d(LCD_WRITE);
return( (high<<4) | low);
}


void lcd_send_nibble( byte n ) {
lcd.data = n;
delay_cycles(1);
lcd.enable = 1;
delay_us(2);
lcd.enable = 0;
}


void lcd_send_byte( byte address, byte n ) {

lcd.rs = 0;
while ( bit_test(lcd_read_byte(),7) ) ;
lcd.rs = address;
delay_cycles(1);
lcd.rw = 0;
delay_cycles(1);
lcd.enable = 0;
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}


void lcd_init() {
byte i;
set_tris_d(LCD_WRITE);
lcd.rs = 0;
lcd.rw = 0;
lcd.enable = 0;
delay_ms(15);
for(i=1;i<=3;++i) {
lcd_send_nibble(3);
delay_ms(5);
}
lcd_send_nibble(2);
for(i=0;i<=3;++i)
lcd_send_byte(0,LCD_INIT_STRING[i]);
}


void lcd_gotoxy( byte x, byte y) {
byte address;

if(y!=1)
address=lcd_line_two;
else
address=0;
address+=x-1;
lcd_send_byte(0,0x80|address);
}

void lcd_putc( char c) {
switch (c) {
case '\f' : lcd_send_byte(0,1);
//delay_ms(2);
break;
case '\n' : lcd_gotoxy(1,2); break;
case '\b' : lcd_send_byte(0,0x10); break;
default : lcd_send_byte(1,c); break;
}
}

char lcd_getc( byte x, byte y) {
char value;

lcd_gotoxy(x,y);
lcd.rs=1;
value = lcd_read_byte();
lcd.rs=0;
return(value);
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 11029
nanard-bis
Guest







THANK YOU, thank you it' work
PostPosted: Mon Jan 27, 2003 8:18 am     Reply with quote

the caractere 'A' appear on my display.
After modify set_tris_b at set_tris_d
and adress lcd 8 and after move adjust contrast.



/*****************************************************************************/
/*16F877 4 signale d'horloge reglabe par 4 registres*/
/*Controlé par
/*RX de la RS232 geré par interruption*/
/*horloge quartz de 12Mhz*/
/*******************/


#include <16F877.H>
#device PIC16F877 10 bit ADC=10/*declaration pour lire ADRESH et ADRESL*/
#use delay (clock=4000000)/*declare le quartz du µc*/
#include <lcd.c>


main()
{
do
{
lcd_init();
delay_ms(100);
lcd_putc('A');
delay_ms(100);
}
while( 1 );
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 11030
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