//定義MCU與LCD的接口
#define LCD_EN_PORT PORTB
#define LCD_RW_PORT PORTB
#define LCD_RS_PORT PORTB
#define LCD_DATA_PORT PORTB
#define LCD_DATA_DDR DDRB
#define LCD_DATA_PIN PINB
#define LCD_EN 0x01 //portd0 out
#define LCD_RW 0x02 //portd1 out/in
#define LCD_RS 0x04 //portc2 out
#define LCD_DATA 0xf0 //portd4/5/6/7 out
/*--------------------------------------------------------------------------------------------------
Public function prototypes
--------------------------------------------------------------------------------------------------*/
void LCD_init (void);
void LCD_en_write (void);
void dat_write_nibble(unsigned data_nibble);
void com_write_nibble(unsigned command_nibble);
void LCD_write_char (unsigned command,unsigned data);
unsigned char LCD_wait_Ready (void);
void LCD_set_xy (unsigned char x, unsigned char y);
void LCD_write_string (unsigned char X,unsigned char Y,unsigned char *s);
void delay_nus (unsigned int n);
void delay_nms (unsigned int n);
/**********************************************************
光標(biāo)命令
LCD_write_char(0x0e,0); //光標(biāo)開(kāi)
LCD_write_char(0x0d,0); //光標(biāo)所在字符閃爍
LCD_write_char(0x0c,0); //光標(biāo)關(guān)
**********************************************************/
/**********************************************************
TC1602B LCD DISPLAY
建立時(shí)間:2003年11月9號(hào)
修改日期:2003年11月14號(hào)
LCD_write函數(shù)功能:當(dāng)command＝0時(shí),向LCD寫入數(shù)據(jù),否則向LCD寫
入命令
LCD第一行顯示寄存器地址:0X80-0X8F
LCD第二行顯示寄存器地址:0XC0-0XCF
**********************************************************/
void LCD_init(void)
{
LCD_DATA_DDR |= LCD_DATA | LCD_RW| LCD_RS | LCD_EN;
delay_nms(20);
com_write_nibble(0x30);
delay_nms(5);
com_write_nibble(0x30);
delay_nus(200);
com_write_nibble(0x30);
delay_nus(200);
com_write_nibble(0x20);
LCD_write_char(0x28,0); //4bit test
LCD_write_char(0x0c,0); //顯示開(kāi)
LCD_write_char(0x01,0); //顯示清屏
//LCD_write_char(0x06,0); //顯示光標(biāo)移動(dòng)設(shè)置
}
void LCD_en_write(void) //EN端產(chǎn)生一個(gè)高電平脈沖,寫LCD
{
LCD_EN_PORT |= LCD_EN;
delay_nus(10);
LCD_EN_PORT &= ~LCD_EN;
delay_nus(10);
}
/*-----------------------------------------------------------------------
LCD_write_char : 英文字符串顯示函數(shù)
輸入?yún)?shù):*s :英文字符串指針;
X、Y : 顯示字符串的位置,X:0-15,Y:0-1
LCD第一行顯示寄存器地址:0X80-0X8F
LCD第一行顯示寄存器地址:0XC0-0XCF
編寫日期 :2003-11-19
最后修改日期 :2004-8-19
-----------------------------------------------------------------------*/
void com_write_nibble(unsigned command_nibble)
{
LCD_RW_PORT &= ~LCD_RW; //RW=0
LCD_RS_PORT &= ~LCD_RS; //RS=0
LCD_DATA_PORT &= 0X0F;
LCD_DATA_PORT |= command_nibble&0xf0;//send high 4bit
LCD_en_write();
}
void dat_write_nibble(unsigned data_nibble)
{
LCD_RW_PORT &= ~LCD_RW; //RW=0
LCD_RS_PORT |= LCD_RS; //RS=1
LCD_DATA_PORT &= 0X0F;
LCD_DATA_PORT |= data_nibble&0xf0; //send high 4bit
LCD_en_write();
}
void LCD_write_char(unsigned command,unsigned data)
{
unsigned command_temp,data_temp;
command_temp = command;
data_temp = data;
while((LCD_wait_Ready()&0x80)!=0);
// LCD_wait_Ready();
if (command == 0)
{
dat_write_nibble(data_temp);
}
else
{
com_write_nibble(command_temp);
}
command_temp=command_temp << 4; //send low 4bit
data_temp=data_temp << 4;
if (command==0)
dat_write_nibble(data_temp);
else
com_write_nibble(command_temp);
LCD_RW_PORT |= LCD_RW;
LCD_RS_PORT ^= LCD_RS;
}
unsigned char LCD_wait_Ready(void) //等待LCD空閑
{
unsigned charbusy_bit=0;
LCD_DATA_DDR &= ~0x80; //PD7 I/O口方向設(shè)置為輸入
LCD_RW_PORT |= LCD_RW; //RW=1
LCD_RS_PORT &= ~LCD_RS; //RS=0
LCD_EN_PORT |= LCD_EN; //EN=1
delay_nus(10);
busy_bit|=LCD_DATA_PIN;
LCD_EN_PORT &= ~LCD_EN; //EN=0
//while (!( LCD_DATA_PIN&0x80 ) == 0); //RW=1,讀PD7,為0表示空閑;
LCD_en_write();
LCD_DATA_DDR |= 0xf0;
return(busy_bit);
}
/*-----------------------------------------------------------------------
LCD_set_xy : 設(shè)置LCD顯示的起始位置
輸入?yún)?shù):x、y : 顯示字符串的位置,X:0-15,Y:0-1
LCD第一行顯示寄存器地址:0X80-0X8F
LCD第一行顯示寄存器地址:0XC0-0XCF
編寫日期 :2004-8-19
最后修改日期 :2004-8-19
-----------------------------------------------------------------------*/
void LCD_set_xy( unsigned char x, unsigned char y )
{
unsigned char address;
if (y == 0) address = 0x80 + x;
else
address = 0xc0 + x;
LCD_write_char( address, 0 );
}
/*-----------------------------------------------------------------------
LCD_write_string : 英文字符串顯示函數(shù)
輸入?yún)?shù):*s :英文字符串指針;
X、Y : 顯示字符串的位置
編寫日期 :2004-8-19
最后修改日期 :2004-8-19
-----------------------------------------------------------------------*/
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
if((X<16)&(Y<2))
LCD_set_xy( X, Y );
while (*s)
{
LCD_write_char( 0, *s );
s ++;
}
}
void LCD_write_space(unsigned char X,unsigned char Y,unsigned char num)
{
unsigned char i;
if((X<16)&(Y<2))
LCD_set_xy( X, Y );
for(i=0;i<num;i++)
{
LCD_write_char(0,’ ’);
}
}
/*-----------------------------------------------------------------------
延時(shí)函數(shù)
系統(tǒng)時(shí)鐘:8M
-----------------------------------------------------------------------*/
void delay_1us(void) //1us延時(shí)函數(shù)
{
asm("nop");
}
void delay_nus(unsigned int n) //N us延時(shí)函數(shù)
{
unsigned int i=0;
for (i=0;i<n;i++)
delay_1us();
}
void delay_1ms(void) //1ms延時(shí)函數(shù)
{
unsigned int i;
for (i=0;i<1140;i++);
}
void delay_nms(unsigned int n) //N ms延時(shí)函數(shù)
{
unsigned int i=0;
for (i=0;i<n;i++)
delay_1ms();
}
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66821730(技術(shù)支持)
