1602液晶屏一个按键控制光标位移-51单片机程序.txt

#include #define cmdread 0x15 #define lcd_data p0 sbit lcd_rs = p12; / 0 = cmd, 1 = data sbit lcd_rw = p16; / 0 = write, 1 = read sbit lcd_e = p13; / 1 = readenable, 1-0 = writeenable sbit cs = p10; sbit clk = p17; sbit data = p16; sbit key = p32; unsigned char keyvalue; unsigned char code logo = “s m i c“; unsigned char code time = “00:00:00 am“; void delay10us(unsigned char count); void delay1ms(unsigned int count); void writelcdcmdnobusy(unsigned char cmd); void writelcdcmd(unsigned char cmd); void writelcddata(unsigned char byte); void lcdinitial(void); unsigned char read7279(void); unsigned char receivebyte(void); void sendbyte(unsigned char byte); main() unsigned char i,j=0; lcdinitial(); / 初始化 writelcdcmd(0x84); / 第1行 for (i=0; logoi != 0; i+) writelcddata(logoi); / s m i c writelcdcmd(0xc2); / 第2行 i = 0; while (timei != 0) writelcddata(timei); / 时间 i+; while (1) if (!key) / 有键按下 keyvalue = read7279(); / 读键值 if(keyvalue=0) writelcdcmd(0x0f); / 设置闪烁 writelcdcmd(0xc2 + j); / ac指定位移位 j+; if(j=8) j=0; delay1ms(1000); / 维持1s while (!key); / lcd初始化 void lcdinitial(void) delay1ms(15); writelcdcmdnobusy(0x38); delay1ms(5); writelcdcmdnobusy(0x38); delay1ms(5); writelcdcmd(0x38); / 5*8点阵，8位数据 writelcdcmd(0x38); writelcdcmd(0x08); writelcdcmd(0x01); / 清屏 writelcdcmd(0x06); / ac自动加1，不移位 writelcdcmd(0x0c); / 开显示，光标不显示，不闪烁 / 延时count * 10us void delay10us(unsigned char count) unsigned char i; while(count-) for (i =0 ; i4 ; i+); / 延时count ms void delay1ms(unsigned int count) unsigned char i; while(count-) for (i =0 ; i120 ; i+); / 写lcd命令，不读取busy位 void writelcdcmdnobusy(unsigned char cmd) lcd_rs = 0; / cmd lcd_rw = 0; / write lcd_e = 1; lcd_data = cmd;/ data lcd_e = 0; / 下降沿 lcd_data = 0xff; / 写lcd命令 void writelcdcmd(unsigned char cmd) unsigned char temp; writelcdcmdnobusy(cmd); lcd_rw = 1; / read do lcd_e = 1; delay1ms(1); temp = lcd_data; lcd_e = 0; while (temp / 写lcd数据 void writelcddata(unsigned char byte) unsigned char temp; lcd_rs = 1; / data lcd_rw = 0; / write lcd_e = 1; lcd_data = byte; lcd_e = 0; lcd_data = 0xff; lcd_rs = 0; lcd_rw = 1; / read do lcd_e = 1; delay1ms(1); temp = lcd_data; lcd_e = 0; while (temp / 从7279读取键值, 返回无符号字节的键值 unsigned char read7279(void) unsigned char byte; cs = 0; delay10us(5); sendbyte(cmdread); byte = receivebyte(); cs = 1; return (byte); / 按位读取8位数据, 返回值为字节数据 unsigned char receivebyte(void) unsigned char i, byte = 0; data = 1; / 设为输入口 for (i=0; i8; i+) clk = 1; delay10us(1); byte = byte 1; if (data) byte = byte | 0x01; clk = 0; delay10us(1); data = 0; / 设为输出口 return (byte); / byte字节按位送出 void sendbyte(unsigned char byte) unsigned char i; clk = 0; for (i=0; i