Cortex-M3 로 캐릭터 LCD 제어하기

 

LCD.c

#include "LCD.h"   void LCD_Init (void) {  unsigned int uiCnt;      RCC_APB2ENR |= (1<<IOPG); //PG의 클럭 인에이블       GPIOG_CRL  = ( (0x3 << 0) | (0x3 << 4) | (0x3 << 8) | (0x3 << 12) | (0x3 << 16) | (0x3 << 20) | (0x3 << 24) | (0x3 << 28) );  GPIOG_CRH =  ( (0x3 << 0) | (0x3 << 4) | (0x3 << 8) | (0x3 << 12) | (0x3 << 16) | (0x3 << 20) | (0x3 << 24) | (0x3 << 28) );   GPIOG_ODR = 0xFFFF;    GPIOG_BRR  = 0xFFFF; // 핀모두 L으로 초기화  //GPIOG_BSRR = (1 << 12);       LCD_Cmd_write(LCD_FUNC);   LCD_Cmd_write(LCD_ENTRY);  LCD_Cmd_write(LCD_CURSOR);  LCD_Cmd_write(LCD_DISPLAY);  LCD_Cmd_write(LCD_CLEAR);  LCD_Cmd_write(LCD_HOME);                        return ; } void LCD_Cmd_write (unsigned char ucdata)    //타이밍도에 맞춘 write operation {  volatile unsigned int iCnt;  GPIOG_BRR  = LCD_EN ;    //EN clear  GPIOG_BRR  = LCD_RS;    //RS clear  GPIOG_BRR  = LCD_RW;    //RW clear  for(iCnt = 0; LCD_DELAY - LCD_DELAY1> iCnt; ++iCnt);  //시간지연  GPIOG_BSRR = LCD_EN ;    //EN set  for(iCnt = 0; LCD_DELAY - LCD_DELAY2 > iCnt; ++iCnt);  //시간지연  GPIOG_BRR  =  (0xFF << LCD_BS);    // BUS clear  GPIOG_BSRR = (ucdata<<LCD_BS);  // BUS data  input  for(iCnt = 0; LCD_DELAY - LCD_DELAY3 > iCnt; ++iCnt);  //시간지연  GPIOG_BRR  = LCD_EN ;    //EN clear  for(iCnt = 0; LCD_DELAY - LCD_DELAY4 > iCnt; ++iCnt);  //시간지연    return; }   void LCD_Data_write (unsigned char ucdata)  // 함수인자로 BUS에 명령어 바로 넣음   { volatile unsigned int iCnt;  GPIOG_BRR  = LCD_EN ;    //EN clear  GPIOG_BSRR  = LCD_RS;    //RS Set  GPIOG_BRR  = LCD_RW;    //RW clear  for(iCnt = 0; LCD_DELAY - LCD_DELAY1> iCnt; ++iCnt);  //시간지연  GPIOG_BSRR = LCD_EN ;    //EN set  for(iCnt = 0; LCD_DELAY - LCD_DELAY2 > iCnt; ++iCnt);  //시간지연  GPIOG_BRR  =  (0xFF << LCD_BS);    // BUS clear  GPIOG_BSRR = (ucdata<<LCD_BS);  // BUS data  input  for(iCnt = 0; LCD_DELAY - LCD_DELAY3 > iCnt; ++iCnt);  //시간지연  GPIOG_BRR  = LCD_EN ;    //EN clear  for(iCnt = 0; LCD_DELAY - LCD_DELAY4 > iCnt; ++iCnt);  //시간지연    return; }   void LCD_String(void *vp) {  while(1)  {   if(*((unsigned char *)vp) == 0 )   {    break;       }   LCD_Data_write(*((unsigned char*)vp));   vp = ((unsigned char *)vp) + 1;  }  return; }

LCD.h

#ifndef _LCD_H_ #define _LCD_H_ #define IOPG (8) #define IOPC (4) //GPIOG(0x40012000) #define  RCC_AHBENR      (*(volatile unsigned int*)0x40021014)  //GPIOG #define  RCC_APB2ENR     (*(volatile unsigned int*)0x40021018)  #define GPIOG_CRL     (*((volatile unsigned int *)(0x40012000))) #define GPIOG_CRH     (*((volatile unsigned int *)(0x40012004))) #define GPIOG_ODR     (*((volatile unsigned int *)(0x4001200C))) #define GPIOG_BSRR    (*((volatile unsigned int *)(0x40012010))) #define GPIOG_BRR     (*((volatile unsigned int *)(0x40012014)))     #define  RCC_AHBENR      (*(volatile unsigned int*)0x40021014)  //GPIOC #define  RCC_APB2ENR     (*(volatile unsigned int*)0x40021018)  #define GPIOC_CRH     (*((volatile unsigned int *)(0x40011004))) #define GPIOC_ODR     (*((volatile unsigned int *)(0x4001100C))) #define GPIOC_BSRR    (*((volatile unsigned int *)(0x40011010))) #define GPIOC_BRR     (*((volatile unsigned int *)(0x40011014)))   #define LCD_RS (1<<0)   // 1을 왼쪽으로 24 시프트 시킴 (0x01000000) #define LCD_RW (1<<1)   // 0x02000000 #define LCD_EN (1<<2)   // 0x04000000 #define LCD_BS (3)              #define LCD_CLEAR   0x01   //0000 0001,  P13, 화면 클리어 #define LCD_HOME   0x02   //0000 0010,  P13, 커서 맨 처음으로 #define LCD_ENTRY   0x06   //0000 0110,  P13, 커서 오른쪽 시프트, 화면고정 #define LCD_DISPLAY 0x0C  //0000 1100, P13, 화면 ON, 커서 OFF, cursor blink OFF #define LCD_CURSOR 0x1C  //0001 1100,  P13, displayshift, shift to the right  #define LCD_FUNC      0x38  //0011 1000,  P13, 8bit, 2lines, 5x7dots #define LCD_DELAY   2500 // 최소 지연시간( 타이밍도에 맞게 동작하기위한 필요 지연시간) #define LCD_DELAY1  0   #define LCD_DELAY2  0 #define LCD_DELAY3  150 #define LCD_DELAY4  50 void LCD_Init (void); void LCD_Cmd_write (unsigned char); void LCD_Data_write (unsigned char); void LCD_String(void *); void LCD_Number(unsigned int, unsigned short); #endif //_LCD_H_