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Change multiple values in a boolean array?

l1t7l3ph0o7

I can't seem to figure this one out,

the scenario is, I have two shift registers connected to my arduino and 16 leds connected to them.

I have a boolean array of 16, then I wrote a function that writes the array to the shift registers. Thats what the writereg(); is

 

I can do neat things like:

for (int i = 1; i<16; i++){

registers[i] = high

}

writereg();

and one led will light up one after the other

 

But is there a way to light up specific multiple leds without a for loop in a single line of code?

The only thing I can think to do is:

registers[1] = HIGH;

registers[4] = HIGH;

registers[10] = HIGH;

registers[16] = HIGH;

writereg();

it would be neat if I could do something like this:

registers[1,4,10,16] = HIGH;

writereg();

anyone know, just curious if there is a less caveman approach to what I'm doing

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    Jory,

              Peter gave you some good information on binary bit manipulating.  However I think what you want to do is to set certain bits of the 16 shift register bits to on with the other bits off.

    If you use the Arduino SHIFTOUT function with something like the code below,

     

    // Send the value as a binary sequence to the 595's

        shiftOut(dataPin, clockPin, MSBFIRST, ByteHigh);

        shiftOut(dataPin, clockPin, MSBFIRST, ByteLow);

     

    Prior to sending the data you should be able to set the high and low bytes to the value you want.  You can 'mask' the high or low bytes to set the specific outputs to a Binary 1.  In this way you can set multiple outputs of the shift registers with very little code.

     

    Please note that I have not tried this myself.

     

    Hope that helps

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  • 0

    Jory,

              Peter gave you some good information on binary bit manipulating.  However I think what you want to do is to set certain bits of the 16 shift register bits to on with the other bits off.

    If you use the Arduino SHIFTOUT function with something like the code below,

     

    // Send the value as a binary sequence to the 595's

        shiftOut(dataPin, clockPin, MSBFIRST, ByteHigh);

        shiftOut(dataPin, clockPin, MSBFIRST, ByteLow);

     

    Prior to sending the data you should be able to set the high and low bytes to the value you want.  You can 'mask' the high or low bytes to set the specific outputs to a Binary 1.  In this way you can set multiple outputs of the shift registers with very little code.

     

    Please note that I have not tried this myself.

     

    Hope that helps

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