AVR写的12864程序.doc

2009-03-08 22:01开始学AVR单片机。第一个用AVR写的程序，电路和前面的电路基本一样，这次就多加了个滑动变阻器。用的是单片机内置1M的晶振，在延时上用AVR Studio仿真过的，应该比较准的。#include#include#define uchar unsigned char#define uint unsigned int#define PSB_CLR PORTB &= (1 PB1) #define PSB_SET PORTB |= (1 PB1) #define EN_CLR PORTB &= (1 PB0) #define EN_SET PORTB |= (1 PB0) #define RW_CLR PORTB &= (1 PB2) #define RW_SET PORTB |= (1 PB2) #define RS_CLR PORTB &= (1 PB3) #define RS_SET PORTB |= (1 PB3) #define RST_CLR PORTB &= (1 PB4) #define RST_SET PORTB |= (1 PB4)#define LED_CLR PORTA &= (1 PA0) #define LED_SET PORTA |= (1 PA0) void lcd_delay(int x) unsigned int i,j; for (i=0;ix;i+);/*写命令*/写命令子程序/*/void send_com(unsigned char command) lcd_delay(156); /延时2ms RS_CLR;RW_CLR; PORTD=command; EN_SET; EN_CLR; /*写数据*/写数据子程序/*/void send_data(unsigned char data ) lcd_delay(156); /延时2msRS_SET;RW_CLR; PORTD=data; EN_SET; EN_CLR;/*/set_xy : 设置LCD显示的起始位置 /输入参数：x、y : 显示字符串的位置，X:0-7，Y:0-3/*/void set_xy(unsigned char xpos,unsigned char ypos)switch(ypos) case 1: send_com(0X80|xpos);break; case 2: send_com(0X90|xpos);break; case 3: send_com(0X88|xpos);break; case 4: send_com(0X98|xpos);break; default:break;/*/ 在指定位置显示字符串 /*/void print(unsigned char x,unsigned char y,char* str) unsigned char lcd_temp; set_xy(x,y); lcd_temp=*str; while(lcd_temp != 0x00) send_data(lcd_temp); lcd_temp=*(+str); /*LCD初始化* void init_LCD(void) DDRD=0XFF; PORTD=0X00; DDRB=0XFF; PORTB=0X00; RST_CLR; PSB_SET; NOP(); NOP(); RST_SET; lcd_delay(15); send_com(0x30); /功能设置，一次送8位数据，基本指令集send_com(0x0C); /0000,1100 整体显示，游标off，游标位置offsend_com(0x01); /0000,0001 清DDRAMsend_com(0x02); /0000,0010 DDRAM地址归位send_com(