/*
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
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
*/
/**********************************************/
/* RS---PD3 RW---PD4 EN--PD6 DATA--PB*/
/*********************************************/
#include <iom16v.h>
#define RS_CLR PORTD &= ~(1 << PD3)
#define RS_SET PORTD |= (1 << PD3)
#define RW_CLR PORTD &= ~(1 << PD4)
#define RW_SET PORTD |= (1 << PD4)
#define EN_CLR PORTD &= ~(1 << PD6)
#define EN_SET PORTD |= (1 << PD6)
/*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;
PORTB = com;
delay_us(5);
EN_CLR;
}
/*显示屏数据写入函数*/
void LCD_write_data(unsigned char data) {
RS_SET;
RW_CLR;
EN_SET;
PORTB = 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) {
DDRB = 0xFF; /*I/O口方向设置*/
DDRD |= (1 << PD3) | (1 << PD4) | (1 << PD6);
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*/
}
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