51单片机-跑马灯例子

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#include "reg52.h" #include "intrins.h" #include <stdio.h> typedef unsigned int u16; typedef unsigned char u8; typedef unsigned int uint; typedef unsigned char uchar; #define LED_PORT P2 #define SMG_A_DP_PORT P0 u8 gsmg_code[17] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,                     0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71}; void delayms(u16 ten_us) {     while (ten_us--)         ; }   sbit led1 = P2 ^ 3; sfr LED = 0xA0;   void main() {     // led1 = 0;     // u8 i = 0;     // LED_PORT = ~0x01;     // uchar aa = 0xfe;     uchar aa = 0x7f;       while (1)     {         LED = aa;         delayms(50000);         aa = _cror_(aa, 1);         if (aa == 0xfe)         {             while (1)             {                 LED = aa;                 delayms(50000);                 aa = _crol_(aa, 1);                 if (aa == 0x7f)                 {                     break;                 }             }         }           // aa = _crol_(aa, 1);           // led1 = 0;         // delayms(50000);         // led1 = 1;         // delayms(50000);         // for (i = 0; i < 4; i++)         // {         //     led1 = 0;         //     delayms(50000);         //     led1 = 1;         //     // LED_PORT = _crol_(LED_PORT, 2);         //     // printf("LED_PORT = %x\n", LED_PORT)         //     delayms(50000);         // }         // for (i = 0; i < 4; i++)         // {         //     // LED_PORT = _cror_(LED_PORT, 2);         //     // printf("LED_PORT = %x\n", LED_PORT)         //     delayms(50000);         // }         // SMG_A_DP_PORT = gsmg_code[0];     } }