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LCD problem / help

 
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SungYong



Joined: 14 Nov 2005
Posts: 2
Location: KOREA

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LCD problem / help
PostPosted: Tue Nov 15, 2005 12:44 am     Reply with quote
Hello, I want to print sum(type double) on LCD display.

device : 16F874
use 8LINES
LCD 16x2

This is my source code.

Code:
#include <C:\Program Files\PICC\Devices\16f874.h>
#use delay(clock=4000000)

struct lcd_pin_map{
         boolean enable;      // lcd enable signal
         boolean rs;          // lcd register select signal
         boolean rw;          // lcd read/write signal
       } lcd_control;

#byte lcd_control = 5         
#byte portb = 6               



void BusyCheck(){
      do{
      portb = 0x00;
      set_tris_b(0xff);
      lcd_control.rs = 0;

      delay_cycles(1);
      lcd_control.rw = 1;
      delay_cycles(1);
      lcd_control.enable = 1;
      delay_cycles(2);
      lcd_control.enable = 0;
      } while(bit_test(portb,7));
                             
      lcd_control.enable = 0;
      portb = 0x00;
      return;
}


void SendChar(char bf){
      BusyCheck();
      set_tris_b(0x00);
      portb = bf;
      lcd_control.rw = 0;
      lcd_control.rs = 1;
      delay_cycles(1);
      lcd_control.enable = 1;
      delay_cycles(1);
      lcd_control.enable = 0;
      return;
}


void SendCmd(char cmd){
      BusyCheck();
      set_tris_b(0x00);
      portb = cmd;
      lcd_control.rw = 0;
      lcd_control.rs = 0;
      delay_cycles(1);
      lcd_control.enable = 1;
      delay_cycles(1);
      lcd_control.enable = 0;
      return;
}



void lcd_init(){
      setup_adc_ports(no_analogs);
      set_tris_b(0x00);
      set_tris_a(0x00);

      lcd_control = 0x00;
      portb = 0x00;

      portb = 0b00111000;     
      delay_cycles(1);
      lcd_control.enable = 1;
      delay_cycles(1);
      lcd_control.enable = 0;
      delay_ms(15);

      portb = 0b00111000;   
      delay_cycles(1);
      lcd_control.enable = 1;
      delay_cycles(1);
      lcd_control.enable = 0;
      delay_ms(1);

      SendCmd(0b00001110);    // disply on/off control
      SendCmd(0b00000110);    // entry mode set
      SendCmd(0b00000001);    // clear display
      SendCmd(0b00000010);    // return home
      return;
}



void gotoxy(int x, int y)
{
      int address;
      if(x>=16) x = 0;
      if(y!=1)
            address = 0x80;   
      else
            address = 0xc0;
      SendCmd(address + x);
}


void main(){

      double sum;
      sum = 10000;

      lcd_init();

      while(1){
         gotoxy(0,0);         
         SendChar("MATH SUM");
         gotoxy(5,1);         
         SendChar(sum);  <<==== This is my problem   :cry:  :question:
      }
}


I know SendChar("10000");
Is there another way to print sum on LCD?
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Tue Nov 15, 2005 12:52 am     Reply with quote
Code:
void main(){

      double sum;
      sum = 10000;

      lcd_init();

      while(1){
         gotoxy(0,0);         
         printf(SendChar, "MATH SUM");
         gotoxy(5,1);         
         printf(SendChar, "%d", sum);
      }
}

_________________
Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!
Ttelmah
Guest
PostPosted: Tue Nov 15, 2005 3:49 am     Reply with quote
First, CCS, does not support a 'double' data type. It accepts the keyword, and stores a 4byte float, for this 'type', but this is a bodge to avoid complaints when porting code. Safer to use one of the types that is documented as supported.
Given this variable then holds a float, the printf % statement to display it, should use %f, or %g (to give different rounding behaviour).
Given that you are only holding integers, better to use either an int16, or an int32. The printf format for these is %Ld (not %d, which only handles single 'byte' integers).

Best Wishes
SungYong



Joined: 14 Nov 2005
Posts: 2
Location: KOREA

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PostPosted: Tue Nov 15, 2005 4:20 am     Reply with quote
Thank you so much!! Razz
Now I can print~ Smile
Thanks again.
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