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Author: AashiDutt

LED_Interface/led.asm

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+ORG 00h ;The ORG directive is used to indicate the beginning of the address
+        ;The number that comes after ORG can either be in hex or decimal
+		;If the number is not followed by H, it is deimal and the assembler will convert it to hex
+		
+		
+		HERE: MOV P1,#0FFH   ; led P1 ,# Indicates that 0FF is a data and not an address
+			  LCALL DELAY    ; Function call for subroutine DELAY
+			  MOV P1,#00H    
+			  LCALL DELAY
+			  SJMP HERE      ; SHORT JUMP to HERE
+			 
+			 
+; delay = 2 x 7 x 255 x 255 x 1.085us =0.99s = total delay duration in microseconds
+DELAY: MOV R0,#07
+HERE3: MOV R1,#255
+HERE2: MOV R2,#255
+HERE1: DJNZ R2,HERE1
+	   DJNZ R1,HERE2
+	   DJNZ R0,HERE3
+	   
+	   RET                   ; return helps to return program counter from subroutine and back to main code
+	
+END
+; this indicates end of code and if any code is written beyond this is ignored by the assembler
+
+; for continious preview of values 
+; goto peripherals --> port 1(P1) --> port window opens -->goto Run or press F5 key

LED_Interface/led.c

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+// This is a code for 8051 microcontroller using Keil Software
+
+// blink led P1
+
+#include<reg52.h>   // include header file
+
+// declare a function
+void ms_delay( unsigned int time);  // unsigned as time does not come with '+' or '-' sign.
+
+void main()
+{
+	
+	while(1)
+	  {
+		P1= 0x0ff;    // on led (giving logic 1 to port P1)
+		ms_delay(1000);   // delay 1s
+		P1=0x00;      // off led (giving logic 0 to port P1)
+		ms_delay(1000);
+	  }
+}
+
+void ms_delay(unsigned int time)
+{
+	unsigned int i,j;
+	
+	// time X 1ms
+	for(i=0;i<time;i++)
+	{
+		for(j=0;j<113;j++);   // creates delay of 1ms
+	}
+}
+
+// use Analysis Window button to verify delay time --> setup -->enter port name--> press enter --> check the analysis(zoom out the window)
+// to debug start debugger --> peripherals --> choose port -->step over /step out(come out of loop) /run(for running whole code)