我这段时间正在学习ucos,在使用到显示字符函数PC_DispChar时总是报错,其中的DISP_BASE不知道取什么值?
#define DISP_BASE 0xB800 /* Base segment of display (0xB800=VGA, 0xB000=Mono) */
我的一个测试代码如下,麻烦各位帮我看一下,多谢:
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <conio.h>
#include <setjmp.h>
#define MK_FP(seg,ofs) ((void *)
(((unsigned long)(seg) << 16) | (unsigned)(ofs)))
#define DISP_BASE 0xB800 /* Base segment of display (0xB800=VGA, 0xB000=Mono) */
#define DISP_MAX_X 80 /* Maximum number of columns */
#define DISP_MAX_Y 25 /* Maximum number of rows */
#define DISP_FGND_WHITE 0x0F
#define DISP_BGND_BLACK 0x00
typedef unsigned char INT8U; /* Unsigned 8 bit quantity */
typedef signed char INT8S; /* Signed 8 bit quantity */
typedef unsigned int INT16U; /* Unsigned 16 bit quantity */
typedef signed int INT16S; /* Signed 16 bit quantity */
typedef unsigned long INT32U; /* Unsigned 32 bit quantity */
typedef signed long INT32S; /* Signed 32 bit quantity */
void PC_DispChar (INT8U x, INT8U y, INT8U c, INT8U color);
void main (void)
{
char * s="M";
PC_DispChar(0,0,*s,DISP_BGND_BLACK+DISP_FGND_WHITE);
}
void PC_DispChar (INT8U x, INT8U y, INT8U c, INT8U color)
{
INT8U *pscr;
INT16U offset;
offset = (INT16U)y * DISP_MAX_X * 2 + (INT16U)x * 2; /* Calculate position on the screen */
pscr = (INT8U *)MK_FP(DISP_BASE, offset);
*pscr++ = c; /* Put character in video RAM */
*pscr = color; /* Put video attribute in video RAM */
}
编译通过了,但是在调试运行到PC_DispChar函数中的*pscr = color; 就报以下错:
DISP_BASE的取值是不是固定的,是不是跟显卡有关啊?我的显示是
NVIDIAＲＩＶＡTNT2非曲直Model 64/Model 64 Pro,是不是其它的原因?大家帮帮我,谢谢!
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