http://blog.csdn.net/boygrass/article/details/6824352
无OS的课程基本都完成了。有之前C/C++的基础,完成得还是比较轻松的。
刚刚完成了 从uC/OS中提取字库,并移植到无OS的环境下。
理解了:
点阵字库实际上就是点阵的二进制表示,通常英文字符用16*8的点阵,中文字符用16*16的点阵。
比如一个英文字符,在字库中就是用16个8位的数来表示,每个数代表点阵的一行。
类似地,汉字在字库中就是用16个16位的数来表示。如下图中,每个点,黑色为1,白色为0,就组成了点阵字库
几个关键的函数
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void Lcd_PutASCII(unsigned int x,unsigned int y,unsigned char ch,unsigned int
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c,unsigned int bk_c,unsigned int st)
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{
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unsigned short int i,j;
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unsigned char *pZK,mask,buf;
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pZK = &__VGA[ch*16];
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for( i = 0 ; i < 16 ; i++ )
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{
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mask = 0x80;
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buf = pZK[i];
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for( j = 0 ; j < 8 ; j++ )
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{
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if( buf & mask )
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{
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PutPixel(x+j,y+i,c);
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}
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else
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{
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if( !st )
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{
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PutPixel(x+j,y+i,bk_c);
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}
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}
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mask = mask >> 1;
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}
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}
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}
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void Lcd_PutHZ(unsigned int x,unsigned int y,unsigned short int QW,unsigned int c,unsigned int bk_c,unsigned int st)
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{
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unsigned short int i,j;
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unsigned char *pZK,mask,buf;
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pZK = &__CHS[ ( ( (QW >> 8) - 1 )*94 + (QW & 0x00FF)- 1 )*32 ];
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for( i = 0 ; i < 16 ; i++ )
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{
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mask = 0x80;
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buf = pZK[i*2];
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for( j = 0 ; j < 8 ; j++ )
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{
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if( buf & mask )
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{
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PutPixel(x+j,y+i,c);
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}
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else
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{
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if( st )
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{
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PutPixel(x+j,y+i,bk_c);
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}
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}
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mask = mask >> 1;
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}
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mask = 0x80;
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buf = pZK[i*2 + 1];
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for( j = 0 ; j < 8 ; j++ )
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{
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if( buf & mask )
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{
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PutPixel(x+j + 8,y+i,c);
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}
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else
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{
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if( st )
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{
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PutPixel(x+j + 8,y+i,bk_c);
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}
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}
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mask = mask >> 1;
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}
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}
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}
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void Lcd_printf(unsigned int x,unsigned int y,unsigned int c,unsigned int bk_c,unsigned int st,char *fmt,...)
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{
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char __LCD_Printf_Buf[256];
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va_list ap;
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unsigned char *pStr = (unsigned char *)__LCD_Printf_Buf;
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unsigned int i = 0;
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va_start(ap,fmt);
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vsprintf(__LCD_Printf_Buf,fmt,ap);
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va_end(ap);
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while(*pStr != 0 )
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{
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switch(*pStr)
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{
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case '\n' :
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{
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break;
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}
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default:
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{
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if( *pStr > 0xA0 & *(pStr+1) > 0xA0 )
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{
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Lcd_PutHZ( x , y , (*pStr - 0xA0)*0x0100 + *(pStr+1) - 0xA0 , c , bk_c , st);
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pStr++;
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i++;
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x += 16;
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}
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else
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{
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Lcd_PutASCII( x , y , *pStr , c , bk_c , st );
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x += 8;
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}
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break;
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}
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}
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pStr++;
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i++;
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if( i > 256 ) break;
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}
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}
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