first commit

led.c

@@ -0,0 +1,73 @@
+#include "reg51.h"
+//#include <at89x51.h>
+
+bit lightoff = 1;
+bit lighton = 0;
+sbit P1_0 = P1^0;
+sbit P1_1 = P1^1;
+sbit P1_2 = P1^2;
+sbit P1_3 = P1^3;
+sbit P1_4 = P1^4;
+sbit P1_5 = P1^5;
+sbit P1_6 = P1^6;
+sbit P1_7 = P1^7;
+void delay_1500ms();
+
+int main () {
+  P1 = 0xFF;
+  while (1) {
+    delay_1500ms();
+    
+    P1_0 = lighton;
+    delay_1500ms();
+    
+    P1_1 = lighton;
+    delay_1500ms();
+    
+    P1_2 = lighton;
+    delay_1500ms();
+    
+    P1_3 = lighton;
+    delay_1500ms();
+    
+    P1_4 = lighton;
+    delay_1500ms();
+    
+    P1_5 = lighton;
+    delay_1500ms();
+    
+    P1_6 = lighton;
+    delay_1500ms();
+    
+    P1_7 = lighton;
+    delay_1500ms();
+    
+    P1_7 = lightoff;
+    delay_1500ms();
+    
+    P1_6 = lightoff;
+    delay_1500ms();
+    
+    P1_5 = lightoff;
+    delay_1500ms();
+    
+    P1_4 = lightoff;
+    delay_1500ms();
+    
+    P1_3 = lightoff;
+    delay_1500ms();
+    
+    P1_2 = lightoff;
+    delay_1500ms();
+    
+    P1_1 = lightoff;
+    delay_1500ms();
+    
+    P1_0 = lightoff;
+  }  // end of while(1)
+}  // end of main()
+
+void delay_1500ms() {
+  unsigned short kk;
+  for (kk = 0; kk < 33000; kk++);
+}