Ohyung Blog

| 태그 'EMPOS'에 해당되는 글 2건 |

07/07/19 - Empos II 보드 Text LCD 테스트
07/07/12 - Empos II 보드 7-Segment와 LED 테스트

Tech - https://ohyung.net/403 (YMD: 07/07/19 15:48)

한백전자의 EMPOS II 보드에서 TextLCD를 제어하는 소스 입니다.
광운대 07년 여름방학중 임베디드 세미나에서 받은 소스로 작성되었으며...
저작권은 RTA랩실과 저에게 있습니다.
상업적 이용및 제출용 이용을 불허합니다.

왜냐면... 느리니까;;; 이건 가치가... 떨어져서;;;
다음에 다시 코딩해봐야할듯 하네요;;;

이 소스로 만든 예제;;;

MakefileCode Type : bash

        
              CC = arm-linux-gcc
INCLUDE = .
 
lcd_test : main.o txtlcd_driver.o 
    $(CC) -o lcd_test main.o txtlcd_driver.o
 
main.o : main.c
    $(CC)  -I$(INCLUDE) -c main.c
 
txtlcd_driver.o : txtlcd_driver.c
    $(CC) -I$(INCLUDE) -c txtlcd_driver.c
 
clean :
    rm -f lcd_test main.o txtlcd_driver.o *.bak

textlcd_driver.c

닫기

textlcd_driver.cCode Type : C

        
          
          
              
              #include < stdio.h>
#include < unistd.h>
#include < stdlib.h>
#include < fcntl.h>
#include < sys/mman.h>
 
#define DEV_NAME  "/dev/mem"  //MEMORY DEVICE
#define ADDROFLCD    0x10700000  //PHYSICAL ADDRESS OF CHARACTER LCD
#define BYTE_LEN    2        //SIZE OF BYTE for MEMORY
 
static int txtlcd_fd;    //device description
 
static unsigned int *lcd;  //pointer for LCD ADDRESS
 
void set_command (unsigned short cmd)
{
 
    cmd=cmd&0x00ff;
 
    *lcd=cmd|0x0000;
    *lcd=cmd|0x0400;
    //*lcd=cmd&0xFDFF;
    *lcd=cmd&0x0000;
    usleep(50);
   
}
 
void write_byte (char ch)
{
    unsigned char data;
    data = ch &0x00ff;
    *lcd=data|0x100;
    *lcd=data|0x500;
    *lcd=data|0x100; 
    usleep(50);
}
 
void set_func()
{
  unsigned short cmd = 0x30; //00110000 data length : 8-bit    
  cmd |= 0x08; //set rows : 2-line    
  set_command (cmd);
}
 
void ctrl_display ()
{
  unsigned short cmd = 0x08; 
  cmd |= 0x04;  //display enable
  set_command(cmd);
}
 
void shift_cursor (int set_scr , int set_rshift)
{
  unsigned short cmd = 0x10;
  cmd = set_scr ? cmd | 0x08 : cmd;
  cmd = set_rshift ? cmd | 0x04 : cmd;
  set_command ( cmd );
}
 
void set_entrymode ()
{
  unsigned short cmd = 0x04;
  cmd |= 0x2;   //increment , do not shift
  set_command ( cmd );
}
 
void ret_home ()
{
  unsigned short cmd = 0x02;
  set_command (cmd);
  //usleep(2000);
}
 
void clr_display()
{
  unsigned short cmd = 0x01;
  set_command (cmd);
  usleep(2000);
}
 
void set_ddr_addr(unsigned char pos)
{
  unsigned short cmd = 0x80; //set D7
  cmd |= (pos & 127); // 7-bit
  set_command ( cmd );
}
 
void init_lcd(unsigned char *addr)
{
  txtlcd_fd = open(DEV_NAME , O_RDWR | O_SYNC);
   
  if (!txtlcd_fd)
  {
    printf ("device open failed\n");
    exit(-1);
  }
   
  addr = mmap(NULL,BYTE_LEN , PROT_WRITE , MAP_SHARED , txtlcd_fd , ADDROFLCD);
   
  if (addr == NULL)
  {
    close(txtlcd_fd);
    printf ("memory map error\n");
    exit(-1);
  }
   
  lcd = (unsigned int*)addr; //pointer fowarding
   
  set_func();
  ctrl_display();
  clr_display ();
  ret_home();
  set_entrymode();  //fix : increment /do not shift
  //usleep(2000);
}
 
void close_lcd(unsigned char *addr)
{
  lcd = NULL;
  munmap(addr , BYTE_LEN);
  close(txtlcd_fd);  
}

            

        
      