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Toggling LED

Matt Werner

Hello all

I am quite new to Keil STR9 Series. I was just learning the whole thing by going through and trying some small examples with it.
I want to know how to control just one LED ( say 7.0) to blink at a time.

   while (1)
         {
            for (n = 0x01; n <= 0xFF; n <<= 1)
            {
               GPIO7->DR[0x3FC] = n;
            }
         }

This piece of code turns on the all 8 LEDS at the same time. How can i blink just one LED (7.0) every 1 second?

Thanks

Parents
  • 0 in reply to Matt Werner

    There is a schematic that you can check for connections - you should check it before writing your code. I believe it is in the Keil folder when you installed the s/w. Normally, I would make a summary of connections for easy lookup.

    IC6 74LVC244 P7.7 => LED7 (1 = ON) P7.6 => LED6 (1 = ON) P7.5 => LED5 (1 = ON) P7.4 => LED4 (1 = ON) P7.3 => LED3 (1 = ON) P7.2 => LED2 (1 = ON) P7.1 => LED1 (1 = ON) P7.0 => LED0 (1 = ON)

Reply
  • 0 in reply to Matt Werner

    There is a schematic that you can check for connections - you should check it before writing your code. I believe it is in the Keil folder when you installed the s/w. Normally, I would make a summary of connections for easy lookup.

    IC6 74LVC244 P7.7 => LED7 (1 = ON) P7.6 => LED6 (1 = ON) P7.5 => LED5 (1 = ON) P7.4 => LED4 (1 = ON) P7.3 => LED3 (1 = ON) P7.2 => LED2 (1 = ON) P7.1 => LED1 (1 = ON) P7.0 => LED0 (1 = ON)

Children