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small_chick
Joined: 17 Jul 2012
Posts: 53
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| creating a function to output a string into LCD ? |
 Posted: Wed Nov 14, 2012 6:43 pm |
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I'd like to create a function to output a string into LCD, but there's a problem here.
lcd.h code:
| Code: |
#define LCD_module
#ifdef LCD_module
/********************************************/
#define LCD_RS RD1
#define LCD_EN RD3
#define LCD_RW RD2
#define LCD_DATA4 RD4
#define LCD_DATA5 RD5
#define LCD_DATA6 RD6
#define LCD_DATA7 RD7
#define LCD_RS_TRIS TRISD1
#define LCD_EN_TRIS TRISD3
#define LCD_RW_TRIS TRISD2
#define LCD_DATA4_TRIS TRISD4
#define LCD_DATA5_TRIS TRISD5
#define LCD_DATA6_TRIS TRISD6
#define LCD_DATA7_TRIS TRISD7
/*------------------------------------------*/
typedef union _BYTE_VAL
{
unsigned char Val;
struct
{
unsigned char b0:1;
unsigned char b1:1;
unsigned char b2:1;
unsigned char b3:1;
unsigned char b4:1;
unsigned char b5:1;
unsigned char b6:1;
unsigned char b7:1;
} bits;
} BYTE_VAL;
/*------------------------------------------*/
unsigned char lcd_get_byte(unsigned char rs);
void lcd_put_byte(unsigned char rs, unsigned char b);
int1 lcd_busy();
void lcd_gotoxy(unsigned char col, unsigned char row);
void lcd_putc(char c);
void lcd_init();
void lcd_clear();
/********************************************/
#endif
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lcd.c code:
| Code: |
#include "lcd.h"
#include "IO_module.h"
#use delay(clock = 4000000)
/*------------------------------------------*/
unsigned char lcd_get_byte(unsigned char rs)
{
BYTE_VAL b;
LCD_DATA4_TRIS = 1;
LCD_DATA5_TRIS = 1;
LCD_DATA6_TRIS = 1;
LCD_DATA7_TRIS = 1;
LCD_RW = 1;
LCD_RS = 0;
if(rs) LCD_RS = 1;
delay_us(20);
LCD_EN = 1;
delay_us(20);
b.bits.b7 = LCD_DATA7;
b.bits.b6 = LCD_DATA6;
b.bits.b5 = LCD_DATA5;
b.bits.b4 = LCD_DATA4;
LCD_EN = 0;
delay_us(20);
LCD_EN = 1;
delay_us(20);
b.bits.b3 = LCD_DATA7;
b.bits.b2 = LCD_DATA6;
b.bits.b1 = LCD_DATA5;
b.bits.b0 = LCD_DATA4;
LCD_EN = 0;
return b.Val;
}
/*------------------------------------------*/
void lcd_put_byte(unsigned char rs, unsigned char b)
{
BYTE_VAL temp;
LCD_DATA4_TRIS = 0;
LCD_DATA5_TRIS = 0;
LCD_DATA6_TRIS = 0;
LCD_DATA7_TRIS = 0;
LCD_RS = 0;
if(rs) LCD_RS = 1;
delay_us(20);
LCD_RW = 0;
delay_us(20);
LCD_EN = 0;
temp.Val = b;
// send the high nibble
LCD_DATA4 = temp.bits.b4;
LCD_DATA5 = temp.bits.b5;
LCD_DATA6 = temp.bits.b6;
LCD_DATA7 = temp.bits.b7;
delay_us(20);
LCD_EN = 1;
delay_us(20);
LCD_EN = 0;
// send the low nibble
LCD_DATA4 = temp.bits.b0;
LCD_DATA5 = temp.bits.b1;
LCD_DATA6 = temp.bits.b2;
LCD_DATA7 = temp.bits.b3;
delay_us(20);
LCD_EN = 1;
delay_us(20);
LCD_EN = 0;
}
/*------------------------------------------*/
int1 lcd_busy()
{
int1 busy;
LCD_DATA4_TRIS = 1;
LCD_DATA5_TRIS = 1;
LCD_DATA6_TRIS = 1;
LCD_DATA7_TRIS = 1;
LCD_RW = 1;
LCD_RS = 0;
delay_us(20);
LCD_EN = 1;
delay_us(20);
busy = LCD_DATA7;
LCD_EN = 0;
delay_us(20);
LCD_EN = 1;
delay_us(20);
LCD_EN = 0;
return busy;
}
/*------------------------------------------*/
void lcd_gotoxy(unsigned char col, unsigned char row)
{
unsigned char address;
if(row!=0)
address=0x40;
else
address=0;
address += col;
lcd_put_byte(0,0x80|address);
while(lcd_busy());
}
/*------------------------------------------*/
void lcd_putc(char c)
{
switch(c)
{
case '\f':
lcd_put_byte(0,1);
delay_ms(2);
break;
case '\n':
lcd_gotoxy(1,2);
break;
case '\b':
lcd_put_byte(0,0x10);
break;
default:
lcd_put_byte(1,c);
break;
}
}
/*------------------------------------------*/
void lcd_init()
{
int8 temp;
LCD_EN_TRIS = 0;
LCD_RS_TRIS = 0;
LCD_RW_TRIS = 0;
LCD_DATA4_TRIS = 0;
LCD_DATA5_TRIS = 0;
LCD_DATA6_TRIS = 0;
LCD_DATA7_TRIS = 0;
LCD_EN = 0;
LCD_RS = 0;
LCD_RW = 0;
delay_ms(100); // delay for power on
// reset LCD
lcd_put_byte(0,0x30);
delay_ms(50);
lcd_put_byte(0,0x30);
delay_ms(50);
lcd_put_byte(0,0x32);
delay_ms(100); // delay for LCD reset
delay_ms(100); // delay for LCD reset
delay_ms(100); // delay for LCD reset
while(lcd_busy());
/*Function set:4 bit interface + 2 lines + 5x7 dot format
*/
lcd_put_byte(0,0x28);
while(lcd_busy());
/*display off + cursor underline & cursor blink off
*/
lcd_put_byte(0,0x08);
while(lcd_busy());
/*display on + cursor underline & cursor blink off
*/
lcd_put_byte(0,0x0C);
while(lcd_busy());
/*clear display and move cursor to home
*/
lcd_put_byte(0,0x01);
while(lcd_busy());
/*Character Entry mode:increment + display shift off
*/
lcd_put_byte(0,0x06);
while(lcd_busy());
}
/*------------------------------------------*/
void lcd_clear()
{
lcd_put_byte(0,1); // display off
while(lcd_busy());
}
/*------------------------------------------*/
void lcd_puts(const char* s)
{
while(*s)
{
lcd_putc(*s++);
}
}
|
and error statements from MPLAB:
*** Error 28 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 196(21,25): Expecting an identifier
*** Error 48 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 196(27,28): Expecting a (
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 197(1,2): Expecting a declaration
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 198(1,6): Expecting a declaration
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 198(6,7): Expecting a declaration
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 198(7,8): Expecting a declaration
*** Error 48 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 198(8,9): Expecting a (
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 199(1,2): Expecting a declaration
*** Error 32 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 200(11,12): Expecting a , or )
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 200(14,15): Expecting a declaration
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 200(15,16): Expecting a declaration
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 201(1,2): Expecting a declaration
*** Error 43 "D:\document\Study\university of technology\sesmester_7\Embedded System Design\Big_assignment\lcd.c" Line 202(1,2): Expecting a declaration
13 Errors, 0 Warnings.
Halting build on first failure as requested.
BUILD FAILED: Wed Nov 14 19:39:52 2012
////////////////////////////////////////////////////////////////
problem here is "lcd_puts", i don't know why CCS can't accept "const char* s" ? this function works well in Hi-tech compiler !Looking forward to receiving your support !
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Nov 14, 2012 8:28 pm |
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CCS doesn't do constant strings in the same way as Hi-Tech.
Solution:
Don't use 'const' in the function declaration, and add the #device
statement: PASS_STRINGS=IN_RAM |
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small_chick
Joined: 17 Jul 2012
Posts: 53
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| Posted: Wed Nov 14, 2012 9:58 pm |
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| it's well-done now, PCM programmer ! thank you very much ! |
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small_chick
Joined: 17 Jul 2012
Posts: 53
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| Posted: Thu Nov 15, 2012 6:23 pm |
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I've tried lcd.h &.c with PIC16F887 and dsPIC30F4011.Then they work well with only PIC16F887 .
Here the code for PIC16F887:
| Code: |
#include <16F887.h>
#device PASS_STRINGS = IN_RAM
#fuses XT,NOWDT,PUT,BROWNOUT,BORV40
#include "lcd.c"
void main()
{
lcd_init();
lcd_puts("adc");
while(1);
}
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when using dsPIC30F4011, I only changed in lcd.h as following:
| Code: |
#define LCD_RS RB1
#define LCD_EN RB3
#define LCD_RW RB2
#define LCD_DATA4 RB4
#define LCD_DATA5 RB5
#define LCD_DATA6 RB6
#define LCD_DATA7 RB7
#define LCD_RS_TRIS TRISB1
#define LCD_EN_TRIS TRISB3
#define LCD_RW_TRIS TRISB2
#define LCD_DATA4_TRIS TRISB4
#define LCD_DATA5_TRIS TRISB5
#define LCD_DATA6_TRIS TRISB6
#define LCD_DATA7_TRIS TRISB7
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a part of code in IO_module.h (included in lcd.c):
| Code: |
....
#word TRISB = 0x02C6
#word PORTB = 0x02C8
#word LATB = 0x02CA
#bit TRISB8 = 0x02C6.8
#bit TRISB7 = 0x02C6.7
#bit TRISB6 = 0x02C6.6
#bit TRISB5 = 0x02C6.5
#bit TRISB4 = 0x02C6.4
#bit TRISB3 = 0x02C6.3
#bit TRISB2 = 0x02C6.2
#bit TRISB1 = 0x02C6.1
#bit TRISB0 = 0x02C6.0
#bit RB0 = 0x02C8.0
#bit RB1 = 0x02C8.1
#bit RB2 = 0x02C8.2
#bit RB3 = 0x02C8.3
#bit RB4 = 0x02C8.4
#bit RB5 = 0x02C8.5
#bit RB6 = 0x02C8.6
#bit RB7 = 0x02C8.7
#bit RB8 = 0x02C8.8
#bit LATB0 = 0x02CA.0
#bit LATB1 = 0x02CA.1
#bit LATB2 = 0x02CA.2
#bit LATB3 = 0x02CA.3
#bit LATB4 = 0x02CA.4
#bit LATB5 = 0x02CA.5
#bit LATB6 = 0x02CA.6
#bit LATB7 = 0x02CA.7
#bit LATB8 = 0x02CA.8
...
|
code in main.c:
| Code: |
#include <30F4011.h>
#device PASS_STRINGS = IN_RAM
#include "lcd.c"
#fuses XT,NOWDT,PUT64,BROWNOUT,BORV42
void main()
{
ADPCFG = 0xFFFF;//config all ANx as digital
lcd_init();
lcd_puts("adc");
while(1);
}
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I suppose the problem here is in lcd_init() because when i try it, it's always stuck in lcd_busy() ! I can't understand why this happened with dsPIC30F4011 but didn't with PIC16F887 ???? Please help me !  |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19537
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| Posted: Fri Nov 16, 2012 2:11 am |
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Fractionally puzzled what code you are actually using?. The standard lcd.c, that comes with the compiler, doesn't have an lcd.h, or an IO_module.h, nor does it use register bit definitions for the ports. Switch to the standard driver as a 'first thing to do'. In all honesty, flex_lcd, is more flexible, and possibly more likely to work.
The general thing that causes a problem on a particular chip, is that the pins being used 'wake up' configured to something else. Try making sure that analog functions are turned off on these pins before starting.
Best Wishes |
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