lcd驱动程序.c

基于ATMEGA16和DDS的信号发生器的代码

/*
 LCD1602液晶屏驱动模块
 1、可直接嵌入到项目中使用
 2、晶振频率：1M
 3、如晶振提高低层驱动延时要作相应修改
 AVR_AFA
 www.iccavr.com
 程序编写过程中参照了peak的4线显示程序
 peak：AVR论坛技术版版主
*/
#include <iom16.h>

#define RS_BIT PD6                    //RS接到PD6
#define RW_BIT PD5                    //RW接到PD5
#define EN_BIT PD4                    //EN接到PD4
#define LCD_CON_DDR  DDRD
#define LCD_CON_PORT PORTD
#define LCD_DATA_DDR DDRA             //PA为数据接口
#define LCD_DATA_PORT PORTA
#define LCD_DATA_PIN  PINA
#define RS_CLR PORTD &= ~(1 << RS_BIT)
#define RS_SET PORTD |= (1 << RS_BIT)
#define RW_CLR PORTD &= ~(1 << RW_BIT)
#define RW_SET PORTD |= (1 << RW_BIT)
#define EN_CLR PORTD &= ~(1 << EN_BIT)
#define EN_SET PORTD |= (1 << EN_BIT)
/*延时函数*/
void delay_us(unsigned int n) {
 if (n == 0) {
  return ;
  }
 while (--n);
}
/*延时函数*/
void delay_ms(unsigned char i) {
 unsigned char a, b;
 for (a = 1; a < i; a++) {
  for (b = 1; b; b++) {
   ;
   }
  }
}
/*显示屏命令写入函数*/
void LCD_write_com(unsigned char com) {
 
 RS_CLR;
 RW_CLR;
 EN_SET;
 LCD_DATA_PORT = com;
 delay_us(5);
 EN_CLR;
}
/*显示屏命令写入函数*/
void LCD_write_data(unsigned char data) {
 RS_SET;
 RW_CLR;
 EN_SET;
 LCD_DATA_PORT = data;
 delay_us(5);
 EN_CLR;
}
/*显示屏清空显示*/
void LCD_clear(void) {
 LCD_write_com(0x01);
 delay_ms(5);
}
/*显示屏字符串写入函数*/
void LCD_write_str(unsigned char x,unsigned char y,unsigned char *s) {
 
    if (y == 0) {
     LCD_write_com(0x80 + x);
     }
    else {
     LCD_write_com(0xC0 + x);
     }
    
    while (*s) {
     LCD_write_data( *s);
     s ++;
     }
}
/*显示屏单字符写入函数*/
void LCD_write_char(unsigned char x,unsigned char y,unsigned char data) {
 
    if (y == 0) {
     LCD_write_com(0x80 + x);
     }
    else {
     LCD_write_com(0xC0 + x);
     }
    
    LCD_write_data( data);  
}
/*显示屏初始化函数*/
void LCD_init(void) {
 
 LCD_DATA_DDR = 0xFF;      /*I/O口方向设置*/
 LCD_CON_DDR |= (1 <<EN_BIT) | (1 << RW_BIT) | (1 << RS_BIT);
 LCD_write_com(0x38);    /*显示模式设置*/
 delay_ms(5);
 LCD_write_com(0x38);
 delay_ms(5);
 LCD_write_com(0x38);
 delay_ms(5);
 LCD_write_com(0x38);
 
 LCD_write_com(0x08);    /*显示关闭*/
 LCD_write_com(0x01);    /*显示清屏*/
 LCD_write_com(0x06);    /*显示光标移动设置*/
 delay_ms(5);
 LCD_write_com(0x0C);    /*显示开及光标设置*/
}

void main()
{
LCD_init();
LCD_write_str(0,0,"chenxiaOTAO");
while(1);
}