STC8H8K64U单片机LCD1602做的电压表数字一直在变化怎么回事?

ID:1108299 · 发表于 2024-3-8 16:49

#include <STC8h.H>
#include <stdio.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit RS = P2^4; //定义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()); //忙则等待
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()); //忙则等待
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); /*显示模式设置*/
delay(5);
LCD_Write_Com(0x38);
delay(5);
LCD_Write_Com(0x38);
delay(5);
LCD_Write_Com(0x38);
LCD_Write_Com(0x08); /*显示关闭*/
LCD_Write_Com(0x01); /*显示清屏*/
LCD_Write_Com(0x06); /*显示光标移动设置*/
delay(5);
LCD_Write_Com(0x0C); /*显示开及光标设置*/
}

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上电
ADCTIM = 0x3f;       //设置ADC内部时序
ADC_CONTR &= 0x7f;    //AD断电
ADCCFG = 0x2f;       //设置ADC时钟为系统时钟/2/16，12位结果右对齐
ADC_CONTR = 0x80;    //使能ADC模块上电
delay(4);
ADC_CONTR |= 0x01;    //选P01作为AD输入
}

uint ADC_Read()
{
ADC_CONTR |= 0x40;                         //启动AD转换
delay(2);
while ((ADC_CONTR & 0x20)==0);             //查询ADC完成标志
ADC_CONTR &= ~0x20;                      //清完成标志
return ADC_RES << 8 | ADC_RESL;       //返回12位ADC结果
}

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; // 假设参考电压是5V
      DisplayVoltage(voltage);
      delay(900);
}
}
在测量时有点电压（不管是0.5v还是3.3v）就直接显示5V，不进行测量时读数在0~5v之间一直变化。程序有什么错误？指教指教！

ID:1108299 · 发表于 2024-3-9 16:40

wulin 发表于 2024-3-8 21:34
几mV的跳动是正常的，把此示例端口按实际电路改一下即可。

测不了，只显示VCC=0.000V VIN=0.000V。读数无变化

帐号		自动登录	找回密码
密码			立即注册


40 黑币	回复本帖可获得 10 黑币奖励! 每人限 1 次