新手学keil c51碰到的问题，麻烦大家指教 点击：9803 | 回复：27
发表于：2006-03-16 08:51:00
楼主
我在周立功公司的网站上下载了keil7.09DEMO版，然后按着一个论坛上的精华贴“51单片机C语言学习”的说明，一步步的设置和输入代码：
#include <AT89X51.H>
#include <stdio.h>
void main(void)
{
SCON = 0x50; //串口方式1,允许接收
TMOD = 0x20; //定时器1定时方式2
TCON = 0x40; //设定时器1开始计数
TH1 = 0xE8; //11.0592MHz 1200波特率
TL1 = 0xE8;
TI = 1;
TR1 = 1; //启动定时器
while(1)
{
printf ("Hello World!\n"); //显示Hello World
}
}
最后运行却报错，提示信息：
Build target 'Target 1'
assembling STARTUP.A51...
compiling 4.c...
*** WARNING C318 IN LINE 1 OF 4.c: can't open file 'AT89X51.H'
4.C(6): error C100: unprintable character 0xA1 skipped
4.C(6): error C100: unprintable character 0xA1 skipped
4.C(6): error C202: 'SCON': undefined identifier
4.C(7): error C100: unprintable character 0xA1 skipped
4.C(7): error C100: unprintable character 0xA1 skipped
4.C(7): error C202: 'TMOD': undefined identifier
4.C(8): error C100: unprintable character 0xA1 skipped
4.C(8): error C100: unprintable character 0xA1 skipped
4.C(8): error C202: 'TCON': undefined identifier
4.C(9): error C100: unprintable character 0xA1 skipped
4.C(9): error C100: unprintable character 0xA1 skipped
4.C(9): error C202: 'TH1': undefined identifier
4.C(10): error C100: unprintable character 0xA1 skipped
4.C(10): error C100: unprintable character 0xA1 skipped
4.C(10): error C202: 'TL1': undefined identifier
4.C(11): error C100: unprintable character 0xA1 skipped
4.C(11): error C100: unprintable character 0xA1 skipped
4.C(11): error C202: 'TI': undefined identifier
4.C(12): error C100: unprintable character 0xA1 skipped
4.C(12): error C100: unprintable character 0xA1 skipped
4.C(12): error C202: 'TR1': undefined identifier
4.C(14): error C100: unprintable character 0xA1 skipped
4.C(14): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
Target not created
不知道是怎么回事，希望高手能指点迷津。多谢啊！
#include <AT89X51.H>
#include <stdio.h>
void main(void)
{
SCON = 0x50; //串口方式1,允许接收
TMOD = 0x20; //定时器1定时方式2
TCON = 0x40; //设定时器1开始计数
TH1 = 0xE8; //11.0592MHz 1200波特率
TL1 = 0xE8;
TI = 1;
TR1 = 1; //启动定时器
while(1)
{
printf ("Hello World!\n"); //显示Hello World
}
}
最后运行却报错，提示信息：
Build target 'Target 1'
assembling STARTUP.A51...
compiling 4.c...
*** WARNING C318 IN LINE 1 OF 4.c: can't open file 'AT89X51.H'
4.C(6): error C100: unprintable character 0xA1 skipped
4.C(6): error C100: unprintable character 0xA1 skipped
4.C(6): error C202: 'SCON': undefined identifier
4.C(7): error C100: unprintable character 0xA1 skipped
4.C(7): error C100: unprintable character 0xA1 skipped
4.C(7): error C202: 'TMOD': undefined identifier
4.C(8): error C100: unprintable character 0xA1 skipped
4.C(8): error C100: unprintable character 0xA1 skipped
4.C(8): error C202: 'TCON': undefined identifier
4.C(9): error C100: unprintable character 0xA1 skipped
4.C(9): error C100: unprintable character 0xA1 skipped
4.C(9): error C202: 'TH1': undefined identifier
4.C(10): error C100: unprintable character 0xA1 skipped
4.C(10): error C100: unprintable character 0xA1 skipped
4.C(10): error C202: 'TL1': undefined identifier
4.C(11): error C100: unprintable character 0xA1 skipped
4.C(11): error C100: unprintable character 0xA1 skipped
4.C(11): error C202: 'TI': undefined identifier
4.C(12): error C100: unprintable character 0xA1 skipped
4.C(12): error C100: unprintable character 0xA1 skipped
4.C(12): error C202: 'TR1': undefined identifier
4.C(14): error C100: unprintable character 0xA1 skipped
4.C(14): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(16): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
4.C(17): error C100: unprintable character 0xA1 skipped
Target not created
不知道是怎么回事，希望高手能指点迷津。多谢啊！
发表于：2006-04-25 19:49:00
9楼
无符号双字节快速乘法子程序
Q16RR: MOV A,R7 ;(R4R5)*(R6R7)->(R2R3R4R5)
MOV B,R5
MUL AB
XCH A,R5
MOV R3,B
MOV B,R6
MUL AB
ADD A,R3
MOV R2,A
CLR A
ADDC A,B
MOV R3,A
MOV A,R4
MOV B,R7
MUL AB
ADD A,R2
XCH A,R4
XCH A,B
ADDC A,R3
MOV R3,A
MOV F0,C ;F0=PSW.5
MOV A,R6
MUL AB
ADD A,R3
MOV R3,A
CLR A
MOV ACC.0,C
MOV C,F0
ADDC A,B
MOV R2,A
RETI
以上是一个乘法指令,但我对乘法指令 MUL AB 的功能一直搞不明白,我们知道加减法可以位与位之间直接进行运算,我不明白乘法指令如何进行运算,上面的指令我看了好长时间也不懂,恳请那位高手帮我分析一下程序,编程思路是如何的?
Q16RR: MOV A,R7 ;(R4R5)*(R6R7)->(R2R3R4R5)
MOV B,R5
MUL AB
XCH A,R5
MOV R3,B
MOV B,R6
MUL AB
ADD A,R3
MOV R2,A
CLR A
ADDC A,B
MOV R3,A
MOV A,R4
MOV B,R7
MUL AB
ADD A,R2
XCH A,R4
XCH A,B
ADDC A,R3
MOV R3,A
MOV F0,C ;F0=PSW.5
MOV A,R6
MUL AB
ADD A,R3
MOV R3,A
CLR A
MOV ACC.0,C
MOV C,F0
ADDC A,B
MOV R2,A
RETI
以上是一个乘法指令,但我对乘法指令 MUL AB 的功能一直搞不明白,我们知道加减法可以位与位之间直接进行运算,我不明白乘法指令如何进行运算,上面的指令我看了好长时间也不懂,恳请那位高手帮我分析一下程序,编程思路是如何的?
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