Here is the program i wrote with the help of some material on internet. this program supposed to blink a LED on pin of 89c2051 uC. Now this is absolutely doing nothing. i checked the pin with the multimeter, no sign of activity on the port just constant 5V. i got a similar program in HEX compiled format and download it in my 8051. it run fine and LED blinks with 1 sec interval and multmeter also shows a lot of activity on the output pin. in case of my program there is absolutely no activity on multimeter. i suspect there is some thing i am missing in my program. i am using KEIL C51 uVision evaluation version which has a limitation of 2K program.


Also my LED is conneted on pin 1 of port 1 of 89c2051 with a resister between +5v and the output pin so LED becomes on when 0 is on the output.


any help will highly appriciated as these are my early experiments with 8051.



#include <reg52.h>


void Simple_Delay_init(void);
void Simple_Delay_Fifty_Milliseconds(void);
void Simple_Delay_N_Seconds(int);

#define Led_On (1);
#define Led_Off (0);

sbit Led_G = P1^0;


void main(void)
{

Simple_Delay_init();

while(1)
{
Led_G = Led_On;
Simple_Delay_N_Seconds(1);
Led_G = Led_Off;
Simple_Delay_N_Seconds(1);
}
}




void Simple_Delay_N_Seconds(int i)
{
int j;
for(j=1;j<i*20;j++)
{
Simple_Delay_Fifty_Milliseconds();
}
}




void Simple_Delay_Fifty_Milliseconds(void)
{
TR0 = 0;

TH0 = 0x4B;
TL0 = 0xFD;

TF0 = 0;
TR0 = 1;

while(TF0 == 0);

TR0 = 0;
}




void Simple_Delay_init(void)
{
TMOD |= 0x01;
ET0 = 0;
}