单片机——ds18b20——代码

#include #include "../delay/delay.h" #include "lcd.h" /*==================================================== 判断写入命令/数据函数 =====================================================*/ void lcd_write(unsigned char byte, unsigned char flag) { if(flag) { RS = 1; //选择数据寄存器 } else { RS = 0; //选择指令寄存器 } RW = 0; //写 E = 1; //选中LCD LCDPORT = byte; delay_us(5); //稳定 E = 0; //失能LCD } /*==================================================== LCD初始化函数 =====================================================*/ void lcd_init() { delay_ms(15); lcd_write(0x38,LCD_WRITE_COM); //显示8位数据接口，两行显示，5*7点阵字符 delay_ms(5); lcd_write(0x38,LCD_WRITE_COM); delay_ms(5); lcd_write(0x38,LCD_WRITE_COM); delay_ms(5); lcd_write(0x38,LCD_WRITE_COM); delay_ms(5); lcd_write(0x08,LCD_WRITE_COM); //关闭显示，关闭光标的闪烁 delay_ms(5); lcd_write(0x01,LCD_WRITE_COM); //清屏 delay_ms(5); lcd_write(0x06,LCD_WRITE_COM); //设置指针方式，画面不平移 delay_ms(5); lcd_write(0x0c,LCD_WRITE_COM); //打开显示 delay_ms(5); } /*==================================================================================== 写入字符函数 函数原型：void lcd_dis_byte(unsigned char x, unsigned char y, unsigned char byte); 说明：x为行（1——2），y为列（1——8）。 =====================================================================================*/ void lcd_dis_byte(unsigned char x, unsigned char y, unsigned char byte) { unsigned char add; if(((0 == x) || (x > 2)) || ((0 == y) || (y > 16))) { return ; } add = 0x80 + (x - 1) * 0x40 + (y - 1); lcd_write(add,LCD_WRITE_COM); lcd_write(byte,LCD_WRITE_DATA); } /*==================================================================================== 写入字符串函数 函数原型：void lcd_dis_str(unsigned char x, unsigned char y, unsigned char *disdata); 说明：x为行（1——2），y为列（1——8）。 =====================================================================================*/ void lcd_dis_str(unsigned char x, unsigned char y, unsigned charchar *disdata) { unsigned char add; if(((0 == x) || (x > 2)) || ((0 == y) || (y > 16))) { return ; } add = 0x80 + (x - 1) * 0x40 + (y - 1); lcd_write(add,LCD_WRITE_COM); while(*disdata != '\0') { lcd_write(*disdata,LCD_WRITE_DATA); disdata++; } } #if 0 /*=========================================================================== 时间显示函数 ============================================================================*/ void lcd_dis_time() { lcd_write(0x80 + 4,LCD_WRITE_COM); lcd_write((hour / 10) + 0x30,LCD_WRITE_DATA); lcd_write((hour % 10) + 0x30,LCD_WRITE_DATA); lcd_write((min / 10) + 0x30,LCD_WRITE_DATA); lcd_write((min % 10) + 0x30,LCD_WRITE_DATA); lcd_write((sec / 10) + 0x30,LCD_WRITE_DATA); lcd_write((sec % 10) + 0x30,LCD_WRITE_DATA); } #endif ds18b20.c [objc] view plain copy 在CODE上查看代码片派生到我的代码片 #include #include #include #include "./lcd/lcd.h" #include "./delay/delay.h" sbit ds = P1^0; bit ack = 0; /*================================================================= 复位DS18B20 ==================================================================*/ void ds_reset() { ds = 1; ds = 0; delay_us(200); delay_us(100); //480-960us,800us ds = 1; //free ds delay_us(30); if(0 == ds) { ack = 1; } else { ack = 0; } delay_us(200); delay_us(100); } /*================================================================= 向DS18B20中写入一个字节 ==================================================================*/ void ds_send_byte(unsigned char byte) { unsigned char i; for(i = 0; i < 8; i++) { ds = 0; _nop_(); _nop_(); ds = byte & 0x01; byte >>= 1; delay_us(30); ds = 1; } delay_us(30); } bit ds_read_bit() { bit temp; ds = 1; ds = 0; _nop_(); _nop_(); ds = 1; temp = ds; delay_us(30); return temp; } unsigned char ds_read_byte() { unsigned char i; unsigned char j; unsigned char k; for(i = 0; i < 8; i++) { j = ds_read_bit(); k = (j << 7) | (k >> 1); } return k; } void main() { unsigned char a; unsigned char disbuf[20]; unsigned int temp; unsigned int b; float temperature; lcd_init(); while(1) { ds_reset(); ds_send_byte(0xcc); ds_send_byte(0x44); ds_reset(); ds_send_byte(0xcc); ds_send_byte(0xbe); a = ds_read_byte(); b = ds_read_byte(); temp = (b << 8) | a; temperature = (float)temp * 0.0625; sprintf(disbuf,"Temp is %7.3f",temperature); lcd_dis_str(1,1,disbuf); } }