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- #include <reg51.h>
- #include<intrins.h>
- typedef unsigned int u16;
- typedef unsigned char u8;
- sbit SRCLK=P3^6;
- sbit RCLK=P3^5;
- sbit SER=P3^4;
- u8 s; //[color=Red]为什么要全局变量?不用全局变量会报错。[/color]
- u8 ledduan[]={0x3C,0x52,0xA5,0x93,0x93,0xA5,0x52,0x3C,0x00,0xFE,0x10,0x10,0x10,0xFE,0x00,0x00,0x00,0x00,0x7F,0x49,0x49,0x49,0x49,0x00,
- 0x00,0x00,0xFE,0x02,0x02,0x02,0x02,0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x02,0x00,0x00,0x00,0x3C,0x42,0x42,0x42,0x3C,0x00,0x3C,0x52,0xA5,0x93,0x93,0xA5,0x52,0x3C,0x00,0xFE,0x10,0x10,0x10,0xFE,0x00,0x00,0x00,0x00,0x7F,0x49,0x49,0x49,0x49,0x00,
- 0x00,0x00,0xFE,0x02,0x02,0x02,0x02,0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x02,0x00,0x00,0x00,0x3C,0x42,0x42,0x42,0x3C,0x00,};
- u8 ledwei[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};
- void delay(u16 t)
- {
- while(t--);
- }
- void Hc595SendByte(u8 dat)
- {
- u8 a;
- SRCLK=0;
- RCLK=0;
- for(a=0;a<8;a++)
- {
- SER=dat>>7;
- dat<<=1;
- SRCLK=1;
- _nop_();
- SRCLK=0;
- }
- RCLK=1;
- _nop_();
- RCLK=0;
- }
- void main()
- {
- u8 i;
- u8 e;
- e=0;
-
- while(1)
- {
- P0=0x7f;
- //[color=Red]为什么不能在这里定义s呢?一定要全局[/color]?
- for(s=0;s<100;s++)
- {
- for(i=0;i<8;i++)
- {
- P0=ledwei[i];
- Hc595SendByte(ledduan[i+e]);
- delay(1);
- Hc595SendByte(0x00);
- }
- }
- e += 1;
- if (e==48)
- {
- e=0;
- }
- }
- }
复制代码
本帖最后由 番杰 于 2021-11-3 20:02 编辑
你在53行定义报错应该是:编译器没有选择使用C99规则吧,(还是哪个规则,这个我记不太清了)
是这个规则规定了:定义可以在函数内的任意地方定义,不必在函数开始定义;
你把u8 s; 在第46行定义应该就不会报错了,或是main()函数内开始的位置都可以(不改变编译规则的情况下)
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