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標題: 'Keydown': missing function-prototype [打印本頁]

作者: hdfc 時間: 2021-6-21 22:16
標題: 'Keydown': missing function-prototype
#include<reg52.h>

#define uchar unsigned char
#define uint unsigned int
extern       unsigned char KeyDown();
extern void Lcd1602_Delay1ms(uint c);
extern void LcdInit();
extern void LcdWriteCom(uchar com);
extern void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s);
extern void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data);
uchar code password[]={1,2,3,4,1,1};
sbit led=P3^0;

main()
{
  uchar num,i=0,j;
      uchar passwordtemp[6];

      uchar passwordlength,PLEN;
  bit flag;
  PLEN=sizeof(password)/sizeof(password[0]);

  PLEN=9;
      LcdInit()       ;
      Lcd1602_Delay1ms(10);
      LcdWriteCom(0x01);
      LCD_Write_String(0,0,"  Welcome! ");
  LCD_Write_String(0,1,"Input password!");

while(1)
{
                     num=Keydown();
                     if(num!=0xff)
                     {
                              if(i==0)
                              LCD_Write_String(0,0,"             ");
                              if(i<16)
                              {
                                    passwordtemp[ i]=num;
                                    LCD_Write_Char(i,1,'*');
                              }
                              i++;
                              if(i==8)
                              {
                                             passwordlength=i-1;
                                             i=0;
                                    if(passwordlength==PLEN)
                                    {
                                             flag=1;
                                             for(j=0;j<PLEN;j++)
                                             flag=flag&&(passwordtemp[j]==password[j]);
                                    }
                                    if(flag)
                                    {
                                             LCD_Write_String(0,1,"                      ");
                                             LCD_Write_String(0,1,"Right Open!>>>>");
                                             led=0;
                                             Lcd1602_Delay1ms(30000);
                                             led=1;

                                             flag=0;
                                    }
                                    else
                                    {
                                             LCD_Write_String(0,1,"                   ");
                                             LCD_Write_String(0,1,"Wrong! Retry!");


                                    }

                              }
                     }
            }

      }

#include<reg52.h>
typedef unsigned int uint;
typedef unsigned char uchar;
#define GPIO_KEY P1
uchar KeyValue;
uchar KeyState;
void Delay10ms();
unsigned char KeyDown();
unsigned char KeyDown()
{
char a;
GPIO_KEY=0x0f;
if(GPIO_KEY!=0x0f)
{
   Delay10ms();
   if(GPIO_KEY!=0x0f)
{
   KeyState=1;
   GPIO_KEY=0X0F;
   Delay10ms();
   switch(GPIO_KEY)
{
   case(0x07):KeyValue=0;break;
   case(0X0b):KeyValue=1;break;
   case(0X0d):KeyValue=2;break;
         case(0X0e):KeyValue=3;break;
}

GPIO_KEY=0XF0;
                     Delay10ms();
                     switch(GPIO_KEY)
                     {
                              case(0X70):       KeyValue=KeyValue;break;
                              case(0Xb0):       KeyValue=KeyValue+4;break;
                              case(0Xd0): KeyValue=KeyValue+8;break;
                              case(0Xe0):       KeyValue=KeyValue+12;break;
                              }
while((a<50)&&(GPIO_KEY!=0xf0))

{
   Delay10ms();
                              a++;
}
a=0;
}
}
return KeyValue;
}
void Delay10ms(void)
{
unsigned char a,b,c;
for(c=1;c>0;c--)
      for(b=38;b>0;b--)
         for(a=130;a>0;a--);
}

#include"reg52.h"
#define LCD1602_DATAPINS P0

#define uchar unsigned char
#define uint unsigned int
uchar x;
sbit LCD1602_RW=P2^5;
sbit LCD1602_RS=P2^6;
sbit LCD1602_E=P2^7;

void Lcd1602_Delay1ms(uint c);

void LcdWriteCom(uchar com);

void LcdWriteData(uchar dat)       ;

void LcdInit();

void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s);

void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data);

void Lcd1602_Delay1ms(uint c)
{
uchar a,b;
      for (; c>0; c--)
      {
               for (b=199;b>0;b--)
               {
                        for(a=1;a>0;a--);
               }
      }

}

void LcdWriteCom(uchar com)
{
      LCD1602_E = 0;
      LCD1602_RS = 0;
      LCD1602_RW = 0;

      LCD1602_DATAPINS = com;
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1;
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;
}

void LcdWriteData(uchar dat)
{
      LCD1602_E = 0;
      LCD1602_RS = 1;
      LCD1602_RW = 0;

      LCD1602_DATAPINS = dat;
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1;
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;
}

void LcdInit()
{
      LcdWriteCom(0x38);
      LcdWriteCom(0x0c);
      LcdWriteCom(0x06);
      LcdWriteCom(0x01);

}

void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)
{
      while (*s)
      {
               LCD_Write_Char(x,y,*s);
               s ++;  x++;
      }
}

void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)
{
      if (y == 0)
      {
      LcdWriteCom(0x80 + x);
      }
      else
      {
               LcdWriteCom(0xC0 + x);
      }
      LcdWriteData( Data);
}

main.c(32): warning C206: 'Keydown': missing function-prototype

作者: hdfc 時間: 2021-6-21 22:18

unsigned char KeyDown()
{
char a;
GPIO_KEY=0x0f;
if(GPIO_KEY!=0x0f)
{
   Delay10ms();
   if(GPIO_KEY!=0x0f)
{
   KeyState=1;
   GPIO_KEY=0X0F;
   Delay10ms();
   switch(GPIO_KEY)
{
   case(0x07):KeyValue=0;break;
   case(0X0b):KeyValue=1;break;
   case(0X0d):KeyValue=2;break;
      case(0X0e):KeyValue=3;break;
}

GPIO_KEY=0XF0;
Delay10ms();
switch(GPIO_KEY)
{
case(0X70): KeyValue=KeyValue;break;
case(0Xb0): KeyValue=KeyValue+4;break;
case(0Xd0): KeyValue=KeyValue+8;break;
case(0Xe0): KeyValue=KeyValue+12;break;
}
while((a<50)&&(GPIO_KEY!=0xf0))

{
   Delay10ms();
a++;
}
a=0;
}
}
return KeyValue;
}

作者: angmall 時間: 2021-6-22 10:55
你這個程序不完整，沒法給你看是哪里出問題了！

作者: 我是小白怎么滴 時間: 2021-6-22 15:01
extern unsigned char KeyDown();
是不是有沒顯示出來的字符

作者: hdfc 時間: 2021-6-22 20:05

我是小白怎么滴發表于 2021-6-22 15:01
extern unsigned char KeyDown();
是不是有沒顯示出來的字符

沒有都顯示出來了

作者: hdfc 時間: 2021-6-22 20:08
本帖最后由 hdfc 于 2021-6-22 20:32 編輯

不明白我明明引用keydown了還出現警告

作者: hdfc 時間: 2021-6-22 20:09
本帖最后由 hdfc 于 2021-6-22 20:35 編輯

他還是警告缺少函數原型

作者: hdfc 時間: 2021-6-22 20:11

angmall 發表于 2021-6-22 10:55
你這個程序不完整，沒法給你看是哪里出問題了！

我發生于的程序了在回復里

作者: hdfc 時間: 2021-6-22 22:08
解決了，大小寫錯了

歡迎光臨 (http://m.raoushi.com/bbs/)