简单的烟雾报警程序中先是缺少了lcd1602的头文件 我从网上找了添加了后发现有错误 求大神帮我解答一下疑问 谢谢了
/********************************
FILE NAME: lcd1602.c
CHIP TYPE: AT89C51
CLOCK FREQUENCY: 12MHZ
IDE: VSMStudio
COMPILER: IAR for 8051
TIME: September 2010
********************************/
#include "reg52.h"
#include "intrins.h"
// Define P3 pins
#define DATA_BUS (P0)
#define RS (P2_bit.P2_0)
#define RW (P2_bit.P2_1)
#define E (P2_bit.P2_2)
// Define new types
typedef unsigned char uchar;
typedef unsigned int uint;
// Function Prototypes
void check_busy(void);
void write_command(uchar com);
void write_data(uchar data);
void LCD_init(void);
void string(uchar ad ,uchar *s);
void lcd_test(void);
void delay(uint);
void main(void)
{ LCD_init();
while(1)
{ string(0x80,"Have a nice day!");
string(0xC0," Proteus VSM");
delay(100);
write_command(0x01);
delay(100);
}
}
/*******************************************
LCD1602 Driver mapped as IO peripheral
*******************************************/
// Delay
void delay(uint j)
{ uchar i = 60;
for(; j>0; j--)
{ while(--i);
i = 59;
while(--i);
i = 60;
}
}
// Test the Busy bit
void check_busy(void)
{ do
{ DATA_BUS = 0xff;
E = 0;
RS = 0;
RW = 1;
E = 1;
__no_operation();
} while(DATA_BUS & 0x80);
E = 0;
}
// Write a command
void write_command(uchar com)
{ check_busy();
E = 0;
RS = 0;
RW = 0;
DATA_BUS = com;
E = 1;
__no_operation();
E = 0;
delay(1);
}
// Write Data
void write_data(uchar data)
{ check_busy();
E = 0;
RS = 1;
RW = 0;
DATA_BUS = data;
E = 1;
__no_operation();
E = 0;
delay(1);
}
// Initialize LCD controller
void LCD_init(void)
{ write_command(0x38); // 8-bits, 2 lines, 7x5 dots
write_command(0x0C); // no cursor, no blink, enable display
write_command(0x06); // auto-increment on
write_command(0x01); // clear screen
delay(1);
}
// Display a string
void string(uchar ad, uchar *s)
{ write_command(ad);
while(*s>0)
{ write_data(*s++);
delay(100);
}
}