Hi!
I have a problem in the following programs, please help me in this regard.actually there are two programs, when I try to compile it using tiny memory model, which is by default, the error message comes, that "non-assignable", and when I try to compile it with small or compact memory model it gives the message that, "linker error" ,please guide me to solve this problem. I am using micro c compiler from
http://www.bipom.com/


the first program

#include <8051io.h> /* include i/o header file */
#include <8051reg.h>

#include "lcddrv.c"

unsigned char count;

main()
{
delay(100);
InitLcd();
Puts("8051SBC V1.0");
goto_xy(0,1);
Puts("Applied Physics");

}
second program

#define BUSY 0x80

#define LCD_command_write (*((unsigned char *)0x0000))
#define LCD_data_write (*((unsigned char *)0x0001))
#define LCD_command_read (*((unsigned char *)0x0002))
#define LCD_data_read (*((unsigned char *)0x0003))

#define LCD 0x0A

LcdReady()
{
char flag;
while((flag=LCD_command_read & BUSY))
{
if(flag == 0xFF) return -1;
}
return 1;
}

void clr_screen(void)
{
LcdReady();
LCD_command_write=0x01;
}


char InitLcd(void)
{
if(-1 ==LcdReady()) return -1;
LCD_command_write=0x38;

LcdReady();
LCD_command_write=0x0c;
clr_screen();
goto_xy(0,0);
}

goto_xy(char x,char y)
{
LcdReady();
switch(y){
case 0 : LCD_command_write=0x80+x; break;
case 1 : LCD_command_write=0xC0+x; break;
case 2 : LCD_command_write=0x94+x; break;
case 3 : LCD_command_write=0xd4+x; break;
}
}

char *Puts(char* str)
{
unsigned char i;

for (i=0; str[i] != ''; i++){
LcdReady();
LCD_data_write=str[i];
}
return str;
}

void putch_lcd(char ch)
{
LcdReady();
LCD_data_write=ch;
}

// print 4 digits decimal on LCD at current position

print_4digit(int n)
{
char buffer[6];
int temp;

if(n<0) buffer[0] = '-';
else buffer[0] = '+';
temp = n;
if(n<0)
{
n=~temp;
n++; // convert to unsigned
}

buffer[1] = (n/1000)+48;
temp = n%1000;
buffer[2] = (temp/100)+48;
temp = n%100;
buffer[3] = (temp/10)+48;
buffer[4] = (temp%10)+48;
putch_lcd(buffer[0]);
putch_lcd(buffer[1]);
putch_lcd(buffer[2]);
putch_lcd(buffer[3]);
putch_lcd(buffer[4]);
}

thanks