LCD1602显示实验数值显示有什么好方法

ID:987773 · 发表于 2021-12-21 23:01

用LCD1602和16个按键实现十进制数的加减乘除四则运算
c是运算结果(即等号后面的数值)有没有比较好的方法显示
两个输入数的范围是0~32767,也就是运算结果范围也很大
从高到低或从低到高提取数字都行
但是要像下图那样在第二行的左边用的C语言

ID:944932 · 发表于 2021-12-21 23:21

#include "r_lcd1602drv.h"
#include "r_matrixKeypad.h"
u8 keyValueTab[][2]={
                  {0xee,'1'},{0xed,'2'},{0xeb,'3'},{0xe7,'+'},
                  {0xde,'4'},{0xdd,'5'},{0xdb,'6'},{0xd7,'-'},
                  {0xbe,'7'},{0xbd,'8'},{0xbb,'9'},{0xb7,'*'},
                  {0x7e,'.'},{0x7d,'0'},{0x7b,'='},{0x77,'/'}
                  };
u8 GetKeyValue(u32 scanCode)
{
int i;
for(i=0;i<16;i++)
      if(scanCode==keyValueTab[i][0])
         return keyValueTab[i][1];
return 0;
}

int main()
{
r_lcd1602drv lcd;
r_matrixKeypad keypad;

uchar buf[20];
u32 scanCode;

float f=0,f1=0;

u8  datBuf[20];
u8  datBuf1[20];
u8  datBufIdx=0;
u8  datBufIdx1=0;

u8 keyValue;
u8 isPoint=0;
u8 isadd=0;
u8 isde=0;

u32 pins[]={Pin3,Pin4,Pin5,Pin6,Pin7,Pin8,Pin9,Pin10};
u32 rowPins[]={Pin5,Pin6,Pin7,Pin8};
u32 colPins[]={Pin1,Pin2,Pin3,Pin4};
InitSystem();
lcd.SetRsPin(GPIOB,Pin0);
lcd.SetRwPin(GPIOB,Pin1);
lcd.SetEnPin(GPIOB,Pin2);
lcd.SetDataPins(GPIOB,pins,8);
lcd.Init();
keypad.SetRowPort(GPIOA,rowPins,4);
keypad.SetColPort(GPIOA,colPins,4);

while(1)
{
scanCode=keypad.GetScanCode();

      if(scanCode!=0)
      {

      if(isde==1)
      {
         isde=0;
         datBufIdx=0;
         datBufIdx1=0;
         lcd.Init();
         lcd.SetRowCol(0,0);
         for(u8 i=0;i<20;i++)
         {
            datBuf[i]=0;
            datBuf1[i]=0;

         }
      }

      if((isadd=='+')|(isadd=='-')|(isadd=='*')|(isadd=='/'))
      {
         keyValue=GetKeyValue(scanCode);
         if(keyValue>='0'&&keyValue<='9')
         {
            datBuf1[datBufIdx1++]=keyValue;
            lcd.DispChar(keyValue);
         }
         if(keyValue=='.')
         {
            if(isPoint==0)
            {
                  datBuf1[datBufIdx1++]=keyValue;
                  lcd.DispChar(keyValue);
                  isPoint=1;
            }
         }

      }

      if(isadd==0)
      {
         keyValue=GetKeyValue(scanCode);
         if(keyValue>='0'&&keyValue<='9')
         {
            datBuf[datBufIdx++]=keyValue;
            lcd.DispChar(keyValue);
         }
         if(keyValue=='.')
         {
            if(isPoint==0)
            {
                  datBuf[datBufIdx++]=keyValue;
                  lcd.DispChar(keyValue);
                  isPoint=1;
            }
         }
         if((keyValue=='+')|(keyValue=='-')|(keyValue=='*')|(keyValue=='/'))
         {
            isadd=keyValue;
            isPoint=0;
            lcd.DispChar(keyValue);
         }

      }

         if(keyValue=='=')
         {
            sscanf((char *)datBuf,"%f",&f);
            sscanf((char *)datBuf1,"%f",&f1);
            switch(isadd)
            {
            case '+':f=f1+f;break;
            case '-':f=f-f1;break;
            case '*':f=f*f1;break;
            case '/':f=f/f1;break;
            }
            lcd.SetRowCol(1,0);
            sprintf((char *)buf,"%.2f",f);
            lcd.DispString(buf);
            isPoint=0;
            datBufIdx=0;
            datBufIdx1=0;
            isde=1;
            isadd=0;
         }

      }
}
}

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