#include <STC8h.H>
#include <stdio.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit RS = P2^4; //定義LCD1602端口
sbit RW = P2^5;
sbit EN = P2^6;
#define DataPort P0
#define RS_CLR RS=0
#define RS_SET RS=1
#define RW_CLR RW=0
#define RW_SET RW=1
#define EN_CLR EN=0
#define EN_SET EN=1
void delay(unsigned int ms) //@11.0592MHz
{
unsigned char i, j;
while(ms--)
{
i = 15;
j = 90;
do
{
while (--j);
} while (--i);
}}
bit LCD_Check_Busy(void)
{
DataPort= 0xFF;
RS_CLR;
RW_SET;
EN_CLR;
delay(1);
EN_SET;
delay(1);
return (bit)(DataPort & 0x80);
}
void LCD_Write_Com(unsigned char com)
{
while(LCD_Check_Busy()); //忙則等待
RS_CLR;
RW_CLR;
EN_SET;
DataPort= com;
delay(1);
EN_CLR;
delay(1);
}
void LCD_Write_Data(unsigned char Data)
{
while(LCD_Check_Busy()); //忙則等待
RS_SET;
RW_CLR;
EN_SET;
DataPort= Data;
delay(1);
EN_CLR;
delay(1);
}
void LCD_Clear(void)
{
LCD_Write_Com(0x01);
delay(5);
}
void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)
{
if (y == 0)
{
LCD_Write_Com(0x80 + x); //表示第一行
}
else
{
LCD_Write_Com(0xC0 + x); //表示第二行
}
while ((*s)!='\0')
{
LCD_Write_Data( *s);
s ++;
}
}
void LCD_Init(void)
{
LCD_Write_Com(0x38); /*顯示模式設置*/
delay(5);
LCD_Write_Com(0x38);
delay(5);
LCD_Write_Com(0x38);
delay(5);
LCD_Write_Com(0x38);
LCD_Write_Com(0x08); /*顯示關閉*/
LCD_Write_Com(0x01); /*顯示清屏*/
LCD_Write_Com(0x06); /*顯示光標移動設置*/
delay(5);
LCD_Write_Com(0x0C); /*顯示開及光標設置*/
}
void DisplayVoltage(float voltage)
{
unsigned char str[16];
sprintf(str,"Voltage: %.2fV",voltage);
LCD_Write_Com(0x80);
LCD_Write_String(0,0,str);
}
void ADC_Init(void)
{
ADC_CONTR |= 0x80; //AD上電
ADCTIM = 0x3f; //設置ADC內部時序
ADC_CONTR &= 0x7f; //AD斷電
ADCCFG = 0x2f; //設置ADC時鐘為系統時鐘/2/16，12位結果右對齊
ADC_CONTR = 0x80; //使能ADC模塊上電
delay(4);
ADC_CONTR |= 0x01; //選P01作為AD輸入
}
uint ADC_Read()
{
ADC_CONTR |= 0x40; //啟動AD轉換
delay(2);
while ((ADC_CONTR & 0x20)==0); //查詢ADC完成標志
ADC_CONTR &= ~0x20; //清完成標志
return ADC_RES << 8 | ADC_RESL; //返回12位ADC結果
}
void main(void)
{
P0M0=0;
P0M1=0;
P2M0=0;
P2M1=0;
LCD_Init();
LCD_Clear();//清屏
ADC_Init();
delay(3);
while (1)
{
unsigned int rawVoltage = ADC_Read();
float voltage = (rawVoltage * 5.0) / 4095; // 假設參考電壓是5V
DisplayVoltage(voltage);
delay(900);
}
}
在測量時有點電壓（不管是0.5v還是3.3v）就直接顯示5V，不進行測量時讀數在0~5v之間一直變化。程序有什么錯誤？指教指教！
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