BS1: reading I/O pins and as a binary byte

Dgswaner

I'm trying to read several pins on a BS1 and I only want to read it as one byte
I'm basically saying w6 = pins
that gives me a 16 bit binary number. "W6 = %0000000001100000"

when I push the button connected to a pin it doesn't seem to have logic as far as the byte produced. I'm sure there is something I'm missing here but I can't figure it out. even if I bebug %B12 and just look at half of the byte it doesn't make sense.

here is an example of what is happening:

W6 = %0000000010000000 pin 7 high only
W6 = %0000000001100000 pin 6 high only
W6 = %0000000001110000 pin 5 high only
W6 = %0000000011110000 pins 7 and 5 high
W6 = %0000000011110000 pins 5,6 and 7 high

If I was reading one pin at a time I could figure out which pin was high, but what if I want to read all 3 pins at once.
I thought that each number was supposed to show the state of a pin O for low 1 for high. what am I missing?
is there a better way to read the I/o pins and send it as a byte?

thanks in advance for any help

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A complex design is the sign of an inferior designer. - Jamie Hyneman, Myth Buster

Bruce Bates

Dgswaner -

Reading I/O pins which are floating (not pulled up or down) can result in strange or unexpected pins states. Add appropriate pull-up or pull-down resistors, and see if your results change.

Regards,

Bruce Bates

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Dgswaner

I'm using a 10K resistor from VDD to the I/O pin to pull them high.

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A complex design is the sign of an inferior designer. - Jamie Hyneman, Myth Buster

Shawn Lowe

The BS1 only has 8 pins, so wont your high byte always be zero? And what you said was read the pins as a word, right?

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Shawn Lowe


Maybe I should have waited to do that......

Dgswaner

yes the high byte will always read a zero, at least as I under how it works. Well here is the plan. I want to read in the i/o pins and xmit them via RF to my Pink Module. I don't want to have to send data 7 different. so I'm trying to read all 7 i/o pins (the 8th pin is required for sending) all at once. the stamp on the receiving end will separate out each bit and know which pin is high and low. it was my understand from the manual that if i say W6 = pins that reads the value of each pin and creates a byte. O indicating a low 1 indicating a high.

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A complex design is the sign of an inferior designer. - Jamie Hyneman, Myth Buster