液晶显示程序 液晶显示, 程序

zlina

    我买的字符液晶模块fm1602c， 我想问资料中提到的250KHz或者是270KHz频率是液晶模块的处理速度吗？

    我说一下我的配置情况，MCU是MC9S08GT60,断口C的3，4，5，6分别作为74HC245的方向控制，RS,RW,E。端口B作为DB线，我的晶振是4MHz，转换成20MHZ的总线频率。

     我写了程序，可以帮我看看，为什么不成功吗？

#include <hidef.h> /* for EnableInterrupts macro */
#include <MC9S08GT60.h> /* include peripheral declarations */

#include "main_asm.h" /* interface to the assembly module */

#define CTRLD PTCDD
#define CTRL PTCD
#define DIR PTCD_PTCD3
#define RS PTCD_PTCD4
#define RW PTCD_PTCD5
#define E PTCD_PTCD6

#define DIRD PTCDD_PTCDD3
#define RSD PTCDD_PTCDD4
#define RWD PTCDD_PTCDD5
#define ED PTCDD_PTCDD6

#define DBD PTBDD
#define DB PTBD
#define BF PTBD_PTBD7 

#define nop asm("nop")           

void busy(); //判忙//
void w_dat(unsigned char); //写显示数据子程序//
void w_com(unsigned char); //写指令代码子程序//
void init(void); //初始化子程序//
//void disp(unsigned char); //显示//
void delay50us(); //延时//
void delay2ms(); //延时//

void busy()
{  
   unsigned char status;
   CTRLD=0x78;
   DBD=0x00;
   DIR=0;
  
   do{
     RS=0;
     RW=1;
     E=1;
     status=DB;
     delay50us();
     delay50us();
     delay50us();
     delay50us();
   }while(status&0x80);
     nop;
     E=0;
     RS=1;
     RW=0;
}

void delay2ms()
{
  #asm
    delay2ms:
      PSHA
      LDA #$0C
    loop1:
      PSHA
      LDA #$64
    loop2:
      NOP
      NOP
      DBNZA loop2
      PULA
      DBNZA loop1
      PULA
  #endasm
}

void delay50us()  {
  #asm
    delay50us:
      PSHA
      LDA #$64
    loop:
      NOP
      NOP
      DBNZA loop
      PULA
  #endasm
}

 

void w_dat(unsigned char dat) //写数据//
{
 
  CTRLD=0x78;
  DBD=0xff;
  DIR=1;
 
  E=1;
  RS=1;
  RW=0;    
  DB=dat;
  delay50us();
  delay50us();
  nop;
  E=0;
  RS=0;
  RW=1;
}

void w_com(unsigned char com) //写指令//
{
  CTRLD=0x78;
  DBD=0xff;
  DIR=1;
 
  E=1;
  RS=0;
  RW=0; 
  DB=com;
  delay2ms();
  nop;
  E=0;
  RS=1;
  RW=1;
 
}

void init(void) {
  unsigned char i;
  for (i=0;i<3;i++){
    w_com(0x38);
    delay50us();
    delay50us();
    busy();
  }
 
  w_com(0x01);
  delay2ms();
  busy();
 
 
  w_com(0x02);
  delay2ms();
  busy();
 
  w_com(0x04);
  delay50us();
  delay50us();
  busy();
 
  w_com(0x0c);
  delay50us();
  delay50us();
  busy();
 
  w_com(0x07);
  delay50us();
  delay50us();
  busy();
}

const unsigned char String[12]={0x57,0x45,0x4c,0x43,0x4f,0x4d,0x45,0x20,0x59,0x4f,0x55,0x21};//WELCOME YOU
/*void disp(void)
{
  unsigned char i=0;
   init();
  RS=0;
  RW=0;
  w_com(0x00);
  RS=1;
  RW=0;
  for(i=0;i<=11;i++)
  w_dat(String);
}  */

void main(void) {
  unsigned char i;
  SOPT_COPE=0;
  EnableInterrupts; /* enable interrupts */
  /* include your code here */

  asm_main(); /* call the assembly function */
  init();
  w_com(0x40);
  delay50us();
  delay50us();
   
  for(i=0;i<=11;i++) {
    w_dat(String);
    delay50us();
    delay50us(); 
  }
  w_com(0x01);
  delay50us();
  delay50us();
  for(;;) {
    __RESET_WATCHDOG(); /* feeds the dog */
   
  //disp();

  } /* loop forever */
  /* please make sure that you never leave this function */
}