* 【编译环境】： ICCAVR
* 【函数功能】： 1602字符显示
* 【晶 振】: 8M
* 【芯 片】: ATMEGA16A
#include<iom16v.h>
#define uchar unsigned char
#define uint unsigned int
uchar wz[]={"mcustudio1com-cn"};
uchar gd[]={"Tel:15980xx5601"};
#define uchar unsigned char
#define uint unsigned int
#define RS 0
#define RW 1
#define EN 2
void s_ms(uint ms)
{
for(;ms>1;ms--);
}
//查忙
void busy(void)
{
uchar temp;
s_ms(500);
PORTA&=~(1<<RS); //RS=0
s_ms(500);
PORTA|=(1<<RW); //RW=1
s_ms(500);
while(temp)
{
PORTA|=(1<<EN); //EN=1
s_ms(500);
DDRB=0x00; //A口变输入
PORTB=0xff; //上拉使能
s_ms(500);
temp = PINB&0x80; //读取A口
s_ms(500);
DDRB=0xff;
PORTB=0xff; //A口变输出
s_ms(500);
PORTA&=~(1<<EN); //EN=0
s_ms(500);
}
}
//写指令
void writecom(uchar com)
{
busy();
s_ms(500);
PORTA&=~(1<<RS); //RS=0
s_ms(500);
PORTA&=~(1<<RW); //RW=0
s_ms(500);
PORTA|=(1<<EN); //EN=1
s_ms(500);
PORTB = com; //输出指令
s_ms(500);
PORTA&=~(1<<EN); //EN=0
s_ms(500);
}
//1602初始化
void LcdInit(void)
{
DDRB = 0xff;
PORTB = 0x00;
writecom(0x38);
s_ms(1000);
writecom(0x01);
s_ms(1000);
s_ms(1000);
s_ms(1000);
s_ms(1000);
s_ms(1000);
s_ms(1000);
s_ms(1000);
writecom(0x02);
s_ms(1000);
writecom(0x06);
s_ms(1000);
writecom(0x0c);
s_ms(1000);
writecom(0x38);
s_ms(1000);
}
//写数据
void writedata(uchar data)
{
busy();
s_ms(500);
PORTA|=(1<<RS); //RS=1
s_ms(500);
PORTA&=~(1<<RW); //RW=0
s_ms(500);
PORTA|=(1<<EN); //EN=1
s_ms(500);
PORTB = data; //输出数据
s_ms(500);
PORTA&=~(1<<EN); //EN=0
s_ms(500);
}
//读数据
uchar readdata(void)
{
uchar temp;
busy();
s_ms(500);
PORTA|=(1<<RS); //RS=1
s_ms(500);
PORTA|=(1<<RW); //RW=1
s_ms(500);
PORTA|=(1<<EN); //EN=1
s_ms(500);
DDRB=0x00; //A端口变输入
s_ms(500);
temp = PINB; //读A端口
s_ms(500);
DDRB=0xff; //A端口变输出
s_ms(500);
PORTA&=~(1<<EN); //EN=0
s_ms(500);
return temp;
}
//=================================================
// 描述： 写LCD内部CGRAM函数
// 入口： ‘num’要写的数据个数
// ‘pbuffer’要写的数据的首地址
// 出口： 无
//================================================
void WriteCGRAM(uint num, const uint *pBuffer)
{
uint i,t;
writecom(0x40);
PORTA|=(1<<RS);
PORTA&=~(1<<RW);
for(i=num;i!=0;i--)
{
t = *pBuffer;
PORTA|=(1<<EN);
PORTB = t;
PORTA&=~(1<<EN);
pBuffer++;
}
}
//=================================================
//描述：写菜单函数，本程序使用的LCD规格为 16 * 2
//入口：菜单数组首地址
//出口：无
//=================================================
void WriteMenu(const uchar *pBuffer)
{
uchar i,t;
writecom(0x80); //数据地址
PORTA|=(1<<RS);
PORTA&=~(1<<RW);
s_ms(50);
for(i=0;i<16;i++)
{
t = *pBuffer;
PORTB = t;
PORTA|=(1<<EN);
s_ms(50);
PORTA&=~(1<<EN);
pBuffer++;
}
writecom(0xC0);
PORTA|=(1<<RS);
PORTA&=~(1<<RW);
s_ms(50);
for(i=0;i<16;i++)
{
t = *pBuffer;
PORTB = t;
PORTA|=(1<<EN);
s_ms(50);
PORTA&=~(1<<EN);
pBuffer++;
}
}
//====================================================
// 描述：在任意位置写数字函数
// 入口：’row‘表示要写数字所在的行地址，只能为1或2
// ’col‘表示要写数字所在的列地址，只能为0--15
// ‘num’表示要写的数字，只能为0--9
// 出口：无
//===================================================
void WriteNum(uint row,uint col,uint num)
{
if (row == 1) row = 0x80 + col;
else row = 0xC0 + col;
writecom(row);
if (num<=0 | num>9) num =0x30;
else num = 0x30 + num;
PORTA|=(1<<RS);
s_ms(500);
PORTA&=~(1<<RW);
s_ms(500);
PORTB = num;
s_ms(500);
PORTA|=(1<<EN);
s_ms(500);
PORTA&=~(1<<EN);
s_ms(500);
}
//================================================================
// 描述：在任意位置写任意多个字符
// 入口：’row‘要写的字符所在的行，只能为1或2；
// ‘col’要写的字符所在的列，只能为0---15
// ‘num’要写字符的个数
// ‘pbuffer’要写字符的首地址
//==================================================================
void WriteChar(uchar row,uchar col,uint num,uchar *pBuffer)
{
uchar i,t;
if (row == 1) row = 0x80 + col;
else row = 0xC0 + col;
writecom(row);
//if (num<=0 | num>9) num =0x30;
//else num = 0x30 + num;
PORTA|=(1<<RS);
s_ms(500);
PORTA&=~(1<<RW);
s_ms(500);
for(i=num;i!=0;i--)
{
t = *pBuffer;
s_ms(500);
PORTDB = t;
s_ms(500);
PORTA|=(1<<EN);
s_ms(500);
PORTA&=~(1<<EN);
s_ms(500);
pBuffer++;
}
}
void main()
{
DDRA=0xff;
PORTA=0xff;
DDRD=0xff;
PORTD=0xff;
s_ms(5000); //延时
LcdInit(); //1602初始化
WriteChar(1,1,13,wz); //显示第一行
WriteChar(2,1,16,gd); //显示第二行
} |
