lpc2138 ve hd44780 lcd

[muat]

Arkadaşlar elimde bir lpc2138 var, ve ben buna bir hd44780 lcd takmak istiyorum.
Ancak uygun kütüphane bulamadım, C de kendi kütüphanemi yazacak kadar iyi değilim.
Aslında ARM kullanmak beni biraz aşıyo, ancak bir proje için kullanmam gerekiyo.
Derleyici olarak Keil kullanıyorum.
Yardımlarınız için şimdiden teşekkürler.

[Cetinal]

http://gandalf.arubi.uni-kl.de/avr_projects/arm_projects/
http://csserver.evansville.edu/~blandfor/EE354/

bu linklerde bulabilirsiniz

[muat]

mesela şöyle bir örnek kod buldum

#include <stdio.h>                /* prototype declarations for I/O functions */
#include <LPC21xx.H>              /* LPC21xx definitions                      */


/****************/
/* main program */
/****************/
int main (void)  {                /* execution starts here                    */

  /* initialize the serial interface   */
  PINSEL0 = 0x00050000;           /* Enable RxD1 and TxD1                     */
  U1LCR = 0x83;                   /* 8 bits, no Parity, 1 Stop bit            */
  U1DLL = 97;                     /* 9600 Baud Rate @ 15MHz VPB Clock         */
  U1LCR = 0x03;                   /* DLAB = 0                                 */

  printf ("Hello World\n");       /* the 'printf' function call               */

  while (1) {                     /* An embedded program does not stop and    */
    ;  /* ... */                  /* never returns.  We've used an endless    */
  }                               /* loop.  You may wish to put in your own   */
}                                 /* code were we've printed the dots (...).  */

fakat burada lcdnin hangi pinlere takılacağını anlayamadım.
sanırım seri bağlantıdan gönderiyor, bu lcdye yazmıyor mu?

[Cetinal]

bu bir uart örneği lcd örneği değil

[muat]

Bir de şöyle bir kütüphane buldum, bunu kullanmayı deneyeceğim.

// Copyright (c) 2004 senz at arm.dreamislife.com
//
//
// THIS FILE IS PROVIDED AS IS WITH NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

/***************************************/
/* LCD routines for OLIMEX LPC-MT-2106 */
/* 16x2 Character LCD 1602K            */
/* 4-bit mode operation                */
/***************************************/


/* DEFINE IOMASK */
#define  LCD_D4  0x10   //P0.04
#define  LCD_D5  0x20   //P0.05
#define  LCD_D6  0x40   //P0.06
#define  LCD_D7  0x80   //P0.07
#define  LCD_EN  0x400000   //P0.22
#define  LCD_RS  0x800000   //P0.23
#define  LCD_RW  0x1000000  //P0.24

#define  LCD_DATA           (LCD_D4|LCD_D5|LCD_D6|LCD_D7)
#define  LCD_IOALL          (LCD_D4|LCD_D5|LCD_D6|LCD_D7|LCD_EN|LCD_RS|LCD_RW)

#define  LCD_GPIO_SEL0      0x0000FF00   //MASK for P0.04-P0.07
#define  LCD_GPIO_SEL1      0x0003F000   //MASK for P0.22-P0.24


/* Functions Header */
/* internal I/O functions */
#define lcd_rs_set() IOSET |= LCD_RS
#define lcd_rs_clr() IOCLR |= LCD_RS
#define lcd_en_set() IOSET |= LCD_EN
#define lcd_en_clr() IOCLR |= LCD_EN
#define lcd_rw_set() IOSET |= LCD_RW
#define lcd_rw_clr() IOCLR |= LCD_RW

/* wait until lcd controller is free */
void lcd_wait();
void lcd_out_data4(unsigned char);
void lcd_write_nibbles(unsigned char);
void lcd_write_control(unsigned char);



/* initialize both the GPIO of lpc and LCD */
void lcd_init();

#define lcd_clear()         lcd_write_control(0x01)
#define lcd_cursor_home()   lcd_write_control(0x02)

#define lcd_display_on()    lcd_write_control(0x0E)
#define lcd_display_off()   lcd_write_control(0x08)

#define lcd_cursor_blink()  lcd_write_control(0x0F)
#define lcd_cursor_on()     lcd_write_control(0x0E)
#define lcd_cursor_off()    lcd_write_control(0x0C)

#define lcd_cursor_left()   lcd_write_control(0x10)
#define lcd_cursor_right()  lcd_write_control(0x14)
#define lcd_display_sleft() lcd_write_control(0x18)
#define lcd_display_sright() lcd_write_control(0x1C)



/* put a character out to lcd */
void lcd_putchar(unsigned char);
/* print a string */
void lcd_print(unsigned char*);

#include "lcd.h"
#include "lpc210x.h"

void lcd_wait(){
      int loop=2800;  //more than enough
      //busy loop
      while(loop--);
}

void lcd_out_data4(unsigned char val){
     IOCLR |= (LCD_DATA);
     IOSET |= (val<<4);
}

void lcd_write_nibbles(unsigned char val){

     //higher-order byte
     lcd_en_set();
     lcd_out_data4((val>>4)&0x0F);
     lcd_en_clr();

     lcd_wait();

     //lower-order byte
     lcd_en_set();
     lcd_out_data4((val)&0x0F);
     lcd_en_clr();
     
     lcd_wait();
}

void lcd_write_control(unsigned char val){
     lcd_rs_clr();
     lcd_write_nibbles(val);
}

void lcd_init(){

        PINSEL0 &= (~LCD_GPIO_SEL0);
        PINSEL1 &= (~LCD_GPIO_SEL1);
        /* we only work on OUTPUT so far */
        IODIR |= LCD_IOALL;
        
        /* IO init complete, init LCD */

       /* init 4-bit ops*/
       lcd_rs_clr();
       lcd_rw_clr();
       lcd_en_clr();


       //wait VDD raise > 4.5V
       lcd_wait();
       
       //dummy inst 
       lcd_write_nibbles(0x30);
       lcd_write_nibbles(0x30);
       lcd_write_nibbles(0x30);

       //FUNCTION SET
       //001DL  N F XX
       //DL=1: 8bit
       //DL=0: 4bit
       //N=0: 1 line display
       //N=1: 2 line display
       //F=0: 5x7 dots
       //F=1: 5x10 dots

       //our case:
       //0010 1000
       lcd_en_set();
       lcd_out_data4(0x2);
       lcd_en_clr();
       lcd_wait();

       lcd_write_nibbles(0x28);
       
       //LCD ON
       lcd_write_nibbles(0x0E);

       //Clear Display
       lcd_write_nibbles(0x01);

       //Entry mode
       lcd_write_nibbles(0x06);

}

void lcd_putchar(unsigned char c){

       lcd_rs_set();
       lcd_write_nibbles(c);
}

void lcd_print(unsigned char* str){
      int i;


      //limit 1 line display for prints
        for (i=0;i<16 && str[i]!=0;i++){
                lcd_putchar(str[i]);
        }

}

Sizce bu kodlarla float tipinde bir dğeişkeni nasıl gösterebilirim?

[leblebitozu]

sprintf fonskiyonu ile float'u string'e çevirirsin