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單片機新人求助大佬12864程序看不太懂

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ID:502902 發表于 2019-7-21 18:53 | 只看該作者 回帖獎勵 |倒序瀏覽 |閱讀模式
程序只截取部分

主要是最后一句語句的*text有什么用，指針指到哪，*text[ i]>0x00實在不知道是什么

這程序為晶聯訊12864的例程

void main()
{
LDEA=1;
while(1)
{

while(1)
{
   initial_lcd();       //初始化
   clear_screen();           //清屏

  clear_screen();            //clear all dots   
  display_string_8x16(3,50,"2019");/*在第 1 頁，第 1 列顯示字符串*/
  display_string_8x16(5,50,"00:00");/*在第 1 頁，第 1 列顯示字符串*/
  waitkey(); //按鍵
}
}
}
u8 code ascii_table_8x16[95][16]={

//粗體 8x16 點陣的 ASCII 碼的點陣數據，從"JLX-GB2312"型號的字庫 IC 中讀出來的國標的。
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,  //- -(即“空格”）ASCII 碼：0X20
0x00,0x00,0x38,0xFC, 0xFC,0x38,0x00,0x00, 0x00,0x00,0x00,0x0D, 0x0D,0x00,0x00,0x00,  //-!-   ASCII 碼：0X21
0x00,0x0E,0x1E,0x00, 0x00,0x1E,0x0E,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,   //-"-
0x20,0xF8,0xF8,0x20, 0xF8,0xF8,0x20,0x00, 0x02,0x0F,0x0F,0x02, 0x0F,0x0F,0x02,0x00,   //-#-
0x38,0x7C,0x44,0x47, 0x47,0xCC,0x98,0x00, 0x06,0x0C,0x08,0x38, 0x38,0x0F,0x07,0x00,   //-$-
0x30,0x30,0x00,0x80, 0xC0,0x60,0x30,0x00, 0x0C,0x06,0x03,0x01, 0x00,0x0C,0x0C,0x00,    //-%-
0x80,0xD8,0x7C,0xE4, 0xBC,0xD8,0x40,0x00, 0x07,0x0F,0x08,0x08, 0x07,0x0F,0x08,0x00,  //-&-
0x00,0x10,0x1E,0x0E, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,  //-'-
0x00,0x00,0xF0,0xF8, 0x0C,0x04,0x00,0x00, 0x00,0x00,0x03,0x07, 0x0C,0x08,0x00,0x00,  //-(-
0x00,0x00,0x04,0x0C, 0xF8,0xF0,0x00,0x00, 0x00,0x00,0x08,0x0C, 0x07,0x03,0x00,0x00,  //-)-

0x80,0xA0,0xE0,0xC0, 0xC0,0xE0,0xA0,0x80, 0x00,0x02,0x03,0x01, 0x01,0x03,0x02,0x00,  //-*-   ASCII 碼：0X2A
0x00,0x80,0x80,0xE0, 0xE0,0x80,0x80,0x00, 0x00,0x00,0x00,0x03, 0x03,0x00,0x00,0x00,  //-+-
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x10,0x1E, 0x0E,0x00,0x00,0x00,  //-,-
0x80,0x80,0x80,0x80, 0x80,0x80,0x80,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,  //---
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x0C, 0x0C,0x00,0x00,0x00,  //-.-
0x00,0x00,0x00,0x80, 0xC0,0x60,0x30,0x00, 0x0C,0x06,0x03,0x01, 0x00,0x00,0x00,0x00,  //-/-
0xF8,0xF8,0x0C,0xC4, 0x0C,0xF8,0xF0,0x00, 0x03,0x07,0x0C,0x08, 0x0C,0x07,0x03,0x00,  //-0-     ASCII 碼：0X30
0x00,0x10,0x18,0xFC, 0xFC,0x00,0x00,0x00, 0x00,0x08,0x08,0x0F, 0x0F,0x08,0x08,0x00,  //-1-
0x08,0x0C,0x84,0xC4, 0x64,0x3C,0x18,0x00, 0x0E,0x0F,0x09,0x08, 0x08,0x0C,0x0C,0x00,  //-2-
0x08,0x0C,0x44,0x44, 0x44,0xFC,0xB8,0x00, 0x04,0x0C,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-3-

0xC0,0xE0,0xB0,0x98, 0xFC,0xFC,0x80,0x00, 0x00,0x00,0x00,0x08, 0x0F,0x0F,0x08,0x00,  //-4-   ASCII 碼：0X34
0x7C,0x7C,0x44,0x44, 0x44,0xC4,0x84,0x00, 0x04,0x0C,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-5-
0xF0,0xF8,0x4C,0x44, 0x44,0xC0,0x80,0x00, 0x07,0x0F,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-6-
0x0C,0x0C,0x04,0x84, 0xC4,0x7C,0x3C,0x00, 0x00,0x00,0x0F,0x0F, 0x00,0x00,0x00,0x00,  //-7-
0xB8,0xFC,0x44,0x44, 0x44,0xFC,0xB8,0x00, 0x07,0x0F,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-8-
0x38,0x7C,0x44,0x44, 0x44,0xFC,0xF8,0x00, 0x00,0x08,0x08,0x08, 0x0C,0x07,0x03,0x00,  //-9-
0x00,0x00,0x00,0x30, 0x30,0x00,0x00,0x00, 0x00,0x00,0x00,0x06, 0x06,0x00,0x00,0x00,  //-:-
0x00,0x00,0x00,0x30, 0x30,0x00,0x00,0x00, 0x00,0x00,0x08,0x0E, 0x06,0x00,0x00,0x00,  //-;-
0x00,0x80,0xC0,0x60, 0x30,0x18,0x08,0x00, 0x00,0x00,0x01,0x03, 0x06,0x0C,0x08,0x00,  //-<-
0x00,0x20,0x20,0x20, 0x20,0x20,0x20,0x00, 0x00,0x01,0x01,0x01, 0x01,0x01,0x01,0x00,  //-=-

0x00,0x08,0x18,0x30, 0x60,0xC0,0x80,0x00, 0x00,0x08,0x0C,0x06, 0x03,0x01,0x00,0x00,  //->-   ASCII 碼：0X3E
0x18,0x1C,0x04,0xC4, 0xE4,0x3C,0x18,0x00, 0x00,0x00,0x00,0x0D, 0x0D,0x00,0x00,0x00,  //-?-
0xF0,0xF0,0x08,0xC8, 0xC8,0xF8,0xF0,0x00, 0x07,0x0F,0x08,0x0B, 0x0B,0x0B,0x01,0x00,  //-@-
0xE0,0xF0,0x98,0x8C, 0x98,0xF0,0xE0,0x00, 0x0F,0x0F,0x00,0x00, 0x00,0x0F,0x0F,0x00,  //-A-   ASCII 碼：0X41
0x04,0xFC,0xFC,0x44, 0x44,0xFC,0xB8,0x00, 0x08,0x0F,0x0F,0x08, 0x08,0x0F,0x07,0x00,  //-B-
0xF0,0xF8,0x0C,0x04, 0x04,0x0C,0x18,0x00, 0x03,0x07,0x0C,0x08, 0x08,0x0C,0x06,0x00,  //-C-
0x04,0xFC,0xFC,0x04, 0x0C,0xF8,0xF0,0x00, 0x08,0x0F,0x0F,0x08, 0x0C,0x07,0x03,0x00,  //-D-
0x04,0xFC,0xFC,0x44, 0xE4,0x0C,0x1C,0x00, 0x08,0x0F,0x0F,0x08, 0x08,0x0C,0x0E,0x00,  //-E-
0x04,0xFC,0xFC,0x44, 0xE4,0x0C,0x1C,0x00, 0x08,0x0F,0x0F,0x08, 0x00,0x00,0x00,0x00,  //-F-
0xF0,0xF8,0x0C,0x84, 0x84,0x8C,0x98,0x00, 0x03,0x07,0x0C,0x08, 0x08,0x07,0x0F,0x00,  //-G-

0xFC,0xFC,0x40,0x40, 0x40,0xFC,0xFC,0x00, 0x0F,0x0F,0x00,0x00, 0x00,0x0F,0x0F,0x00,  //-H-   ASCII 碼：0X48
0x00,0x00,0x04,0xFC, 0xFC,0x04,0x00,0x00, 0x00,0x00,0x08,0x0F, 0x0F,0x08,0x00,0x00,  //-I-
0x00,0x00,0x00,0x04, 0xFC,0xFC,0x04,0x00, 0x07,0x0F,0x08,0x08, 0x0F,0x07,0x00,0x00,  //-J-
0x04,0xFC,0xFC,0xC0, 0xE0,0x3C,0x1C,0x00, 0x08,0x0F,0x0F,0x00, 0x01,0x0F,0x0E,0x00,  //-K-
0x04,0xFC,0xFC,0x04, 0x00,0x00,0x00,0x00, 0x08,0x0F,0x0F,0x08, 0x08,0x0C,0x0E,0x00,  //-L-
0xFC,0xFC,0x38,0x70, 0x38,0xFC,0xFC,0x00, 0x0F,0x0F,0x00,0x00, 0x00,0x0F,0x0F,0x00,  //-M-
0xFC,0xFC,0x38,0x70, 0xE0,0xFC,0xFC,0x00, 0x0F,0x0F,0x00,0x00, 0x00,0x0F,0x0F,0x00,  //-N-
0xF8,0xFC,0x04,0x04, 0x04,0xFC,0xF8,0x00, 0x07,0x0F,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-O-
0x04,0xFC,0xFC,0x44, 0x44,0x7C,0x38,0x00, 0x08,0x0F,0x0F,0x08, 0x00,0x00,0x00,0x00,  //-P-
0xF8,0xFC,0x04,0x04, 0x04,0xFC,0xF8,0x00, 0x07,0x0F,0x08,0x0E, 0x3C,0x3F,0x27,0x00,  //-Q-

0x04,0xFC,0xFC,0x44, 0xC4,0xFC,0x38,0x00, 0x08,0x0F,0x0F,0x00, 0x00,0x0F,0x0F,0x00,  //-R-
0x18,0x3C,0x64,0x44, 0xC4,0x9C,0x18,0x00, 0x06,0x0E,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-S-   
0x00,0x1C,0x0C,0xFC, 0xFC,0x0C,0x1C,0x00, 0x00,0x00,0x08,0x0F, 0x0F,0x08,0x00,0x00,  //-T-
0xFC,0xFC,0x00,0x00, 0x00,0xFC,0xFC,0x00, 0x07,0x0F,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-U-
0xFC,0xFC,0x00,0x00, 0x00,0xFC,0xFC,0x00, 0x01,0x03,0x06,0x0C, 0x06,0x03,0x01,0x00,  //-V-
0xFC,0xFC,0x00,0x00, 0x00,0xFC,0xFC,0x00, 0x07,0x0F,0x0E,0x03, 0x0E,0x0F,0x07,0x00,  //-W-
0x0C,0x3C,0xF0,0xE0, 0xF0,0x3C,0x0C,0x00, 0x0C,0x0F,0x03,0x01, 0x03,0x0F,0x0C,0x00,  //-X-
0x00,0x0C,0x7C,0xC0, 0xC0,0x7C,0x3C,0x00, 0x00,0x00,0x08,0x0F, 0x0F,0x08,0x00,0x00,  //-Y-
0x1C,0x0C,0x84,0xC4, 0x64,0x3C,0x1C,0x00, 0x0E,0x0F,0x09,0x08, 0x08,0x0C,0x0E,0x00,  //-Z-
0x00,0x00,0xFC,0xFC, 0x04,0x04,0x00,0x00, 0x00,0x00,0x0F,0x0F, 0x08,0x08,0x00,0x00,  //-[-

0x38,0x70,0xE0,0xC0, 0x80,0x00,0x00,0x00, 0x00,0x00,0x00,0x01, 0x03,0x07,0x0E,0x00,  //-\-
0x00,0x00,0x04,0x04, 0xFC,0xFC,0x00,0x00, 0x00,0x00,0x08,0x08, 0x0F,0x0F,0x00,0x00,  //-]-     
0x08,0x0C,0x06,0x03, 0x06,0x0C,0x08,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,  //-^-
0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x20,0x20,0x20,0x20, 0x20,0x20,0x20,0x20,  //-_-
0x00,0x00,0x03,0x07, 0x04,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,  //-`-
0x00,0xA0,0xA0,0xA0, 0xE0,0xC0,0x00,0x00, 0x07,0x0F,0x08,0x08, 0x07,0x0F,0x08,0x00,  //-a-   ASCII 碼：0X61
0x04,0xFC,0xFC,0x20, 0x60,0xC0,0x80,0x00, 0x00,0x0F,0x0F,0x08, 0x08,0x0F,0x07,0x00,  //-b-
0xC0,0xE0,0x20,0x20, 0x20,0x60,0x40,0x00, 0x07,0x0F,0x08,0x08, 0x08,0x0C,0x04,0x00,  //-c-
0x80,0xC0,0x60,0x24, 0xFC,0xFC,0x00,0x00, 0x07,0x0F,0x08,0x08, 0x07,0x0F,0x08,0x00,  //-d-
0xC0,0xE0,0xA0,0xA0, 0xA0,0xE0,0xC0,0x00, 0x07,0x0F,0x08,0x08, 0x08,0x0C,0x04,0x00,  //-e-

0x40,0xF8,0xFC,0x44, 0x0C,0x18,0x00,0x00, 0x08,0x0F,0x0F,0x08, 0x00,0x00,0x00,0x00,  //-f-
0xC0,0xE0,0x20,0x20, 0xC0,0xE0,0x20,0x00, 0x27,0x6F,0x48,0x48, 0x7F,0x3F,0x00,0x00,  //-g-     
0x04,0xFC,0xFC,0x40, 0x20,0xE0,0xC0,0x00, 0x08,0x0F,0x0F,0x00, 0x00,0x0F,0x0F,0x00,  //-h-
0x00,0x00,0x20,0xEC, 0xEC,0x00,0x00,0x00, 0x00,0x00,0x08,0x0F, 0x0F,0x08,0x00,0x00,  //-i-
0x00,0x00,0x00,0x00, 0x20,0xEC,0xEC,0x00, 0x00,0x30,0x70,0x40, 0x40,0x7F,0x3F,0x00,  //-j-
0x04,0xFC,0xFC,0x80, 0xC0,0x60,0x20,0x00, 0x08,0x0F,0x0F,0x01, 0x03,0x0E,0x0C,0x00,  //-k-
0x00,0x00,0x04,0xFC, 0xFC,0x00,0x00,0x00, 0x00,0x00,0x08,0x0F, 0x0F,0x08,0x00,0x00,  //-l-
0xE0,0xE0,0x60,0xC0, 0x60,0xE0,0xC0,0x00, 0x0F,0x0F,0x00,0x07, 0x00,0x0F,0x0F,0x00,  //-m-
0x20,0xE0,0xC0,0x20, 0x20,0xE0,0xC0,0x00, 0x00,0x0F,0x0F,0x00, 0x00,0x0F,0x0F,0x00,  //-n-
0xC0,0xE0,0x20,0x20, 0x20,0xE0,0xC0,0x00, 0x07,0x0F,0x08,0x08, 0x08,0x0F,0x07,0x00,  //-o-

0x20,0xE0,0xC0,0x20, 0x20,0xE0,0xC0,0x00, 0x40,0x7F,0x7F,0x48, 0x08,0x0F,0x07,0x00,  //-p-
0xC0,0xE0,0x20,0x20, 0xC0,0xE0,0x20,0x00, 0x07,0x0F,0x08,0x48, 0x7F,0x7F,0x40,0x00,  //-q-     
0x20,0xE0,0xC0,0x60, 0x20,0xE0,0xC0,0x00, 0x08,0x0F,0x0F,0x08, 0x00,0x00,0x00,0x00,  //-r-
0x40,0xE0,0xA0,0x20, 0x20,0x60,0x40,0x00, 0x04,0x0C,0x09,0x09, 0x0B,0x0E,0x04,0x00,  //-s-
0x20,0x20,0xF8,0xFC, 0x20,0x20,0x00,0x00, 0x00,0x00,0x07,0x0F, 0x08,0x0C,0x04,0x00,  //-t-
0xE0,0xE0,0x00,0x00, 0xE0,0xE0,0x00,0x00, 0x07,0x0F,0x08,0x08, 0x07,0x0F,0x08,0x00,  //-u-
0x00,0xE0,0xE0,0x00, 0x00,0xE0,0xE0,0x00, 0x00,0x03,0x07,0x0C, 0x0C,0x07,0x03,0x00,  //-v-
0xE0,0xE0,0x00,0x80, 0x00,0xE0,0xE0,0x00, 0x07,0x0F,0x0C,0x07, 0x0C,0x0F,0x07,0x00,  //-w-
0x20,0x60,0xC0,0x80, 0xC0,0x60,0x20,0x00, 0x08,0x0C,0x07,0x03, 0x07,0x0C,0x08,0x00,  //-x-
0xE0,0xE0,0x00,0x00, 0x00,0xE0,0xE0,0x00, 0x47,0x4F,0x48,0x48, 0x68,0x3F,0x1F,0x00,  //-y-

0x60,0x60,0x20,0xA0, 0xE0,0x60,0x20,0x00, 0x0C,0x0E,0x0B,0x09, 0x08,0x0C,0x0C,0x00,  //-z-   //
0x00,0x40,0x40,0xF8, 0xBC,0x04,0x04,0x00, 0x00,0x00,0x00,0x07, 0x0F,0x08,0x08,0x00,  //-{-   
0x00,0x00,0x00,0xBC, 0xBC,0x00,0x00,0x00, 0x00,0x00,0x00,0x0F, 0x0F,0x00,0x00,0x00,  //-|-
0x00,0x04,0x04,0xBC, 0xF8,0x40,0x40,0x00, 0x00,0x08,0x08,0x0F, 0x07,0x00,0x00,0x00,  //-}-
0x08,0x0C,0x04,0x0C, 0x08,0x0C,0x04,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,  //-~-     ASCII 碼：0X7E

};
void display_string_8x16(u16 page,u16 column,u8 *text)
{
u16 i=0,j,k,n;

while(text[ i]>0x00)
{
  if((text[ i]>=0x20)&&(text[ i]<=0x7e))
  {
   j=text[ i]-0x20;
   for(n=0;n<2;n++)
   {   
    lcd_address(page+n,column);
    for(k=0;k<8;k++)
    {
     transfer_data(ascii_table2_8x16[j][k+8*n]);
    }
   }
   i++;
   column+=8;
   
  }
  else   i++;
}
}
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沙發
ID:421308 發表于 2019-7-21 22:03 | 只看該作者
類似于字符串
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板凳
ID:277550 發表于 2019-7-22 02:48 | 只看該作者
u8 *text

text是函數的參數，是傳進來的u8數組。。。。。。。。。

就是 u8 code ascii_table_8x16[95][16]  二維數組中當中其中一個數組。



*text[ i]>0x00  就是判斷是否到數組的結束了。
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地板
ID:573846 發表于 2019-7-22 03:28 | 只看該作者
*text 是指針；
char test[5]可以理解為 char *test;
但注意*test沒有給出內存大小。
text[ i]>0x00 這里說text[i]（例如是text[10]）的值大于0，
加上while()在這里判斷是否有數據，有就做括號內的。
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5#
ID:540100 發表于 2019-7-22 14:12 | 只看該作者
指針標識，指向數組test的具體定位，用于該數組的元素參與程序運行的
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6#
ID:307020 發表于 2019-7-22 22:47 | 只看該作者
u8 *text為指針變量，在本例中，*text指向字符串“2019”的地址，即顯示函數display_string_8x16(3,50,"2019")要顯示的內容;在顯示函數display_string_8x16(3,50,"2019")的內部：
while(text[ i]>0x00) //只要數據>0
{
  if((text[ i]>=0x20)&&(text[ i]<=0x7e)) //若數據在ASCII碼范圍內，以下為確定數據在ASCII碼表內的對應位置，并讀取對應的顯示數據“數字或字符”；直到*text指針指向的數據為0x00，結束。
  {
   j=text[ i]-0x20;
   for(n=0;n<2;n++)
   {   
    lcd_address(page+n,column);
    for(k=0;k<8;k++)
    {
     transfer_data(ascii_table2_8x16[j][k+8*n]);
    }
   }
   i++;
   column+=8;
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7#
ID:502902 發表于 2019-7-23 16:59 | 只看該作者
好的統一回復，感謝幫助我的大佬
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8#
ID:338478 發表于 2019-7-23 18:35 | 只看該作者
u8* text  text是個指針變量，是用來保存u8類型變量的地址滴，一般字符串放進來，就是第一個字符的地址，但是一般情況下是傳數組進來，就是char a[10],  然后display_string_8x16(1,2,a) ,我在用stm32的時候也經常遇到這種，自己后來也習慣用這種了
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