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 Forum index » DIY Hardware and Software » Arduino
Arduino and shiftregisters
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PHOBoS



Joined: Jan 14, 2010
Posts: 3822
Location: Moon Base
Audio files: 566

PostPosted: Wed Apr 04, 2018 2:37 pm    Post subject: Arduino and shiftregisters
Subject description: controlling the 74HCT595
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Since easter I started using my first Arduino which is a nano V3 (chinese clone).
To expand the inputs and outputs and make it easier to control things I made an interface a while ago.
It was originally created to use with a PIC to contol lights, but turned out to be useful for controlling synths
and of course I can just as easily use an arduino for it.

So I tested it and controlling the outputs worked right away but I had problems with the inputs. After messing
around with the code for a couple of hours I went back to using a PIC to see if the interface was still working.
I did initially have some problems and I don't know if there might have been some corroded connectors but
I got it to work.

I went back to the arduino and noticed that the values for the inputs I was reading where 1 to high.
(0 was 1, 1 was 2, etc.). I searched around a bit and found a replacement code for the shiftIn function.

Code:
uint8_t naShiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {
  uint8_t value = 0;
  uint8_t i;
  for (i = 0; i < 8; ++i) {
    // digitalWrite(clockPin, HIGH);  // old location of clock HIGH
    if (bitOrder == LSBFIRST)
      value |= digitalRead(dataPin) << i;
    else
      value |= digitalRead(dataPin) << (7 - i);
    digitalWrite(clockPin, HIGH);  // new location of clock HIGH
    digitalWrite(clockPin, LOW);
  }
  return value;
}


I found it here and it points to a github link but that is no longer vallid.

So if you run into a similar problem this might solve it.

_________________
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