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nid help on LED blinking

james yeo

i have problem with the led blinking. I using the exmaple program given by keil using uVision3. When i run the program, the LED on the development board didnt blink, it just stay on! wat should i do?

thanks!

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  • 0 in reply to Andy Neil

    That link refers to an 8255 chip.
    not for beginners (and not for advanced either, unless you are an anachronism)
    In the olden days the 8255 had its merits; however today all uCs outrun the 8255 and, in addition to the crummy interface, you will get timing problems.

    Of course, you 'can' use a 2MHz crystal or such, but what's the point?

    Erik

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  • 0 in reply to Andy Neil

    That link refers to an 8255 chip.
    not for beginners (and not for advanced either, unless you are an anachronism)
    In the olden days the 8255 had its merits; however today all uCs outrun the 8255 and, in addition to the crummy interface, you will get timing problems.

    Of course, you 'can' use a 2MHz crystal or such, but what's the point?

    Erik

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