Problem with LIFO Shiftregister

[Tobbel]

Hi,

I am trying to implement a fast and easy way to handle shiftregisters, like the one from the starter kit...

so I tried to write a "case" and add it to the LIFO. But there seems to be a slight problem.. it isn't working....

case 0x46: // ShiftOut

      {

      byte data = 0;

      pinMode(command[2],OUTPUT); //DataPin

      pinMode(command[3],OUTPUT); //ClockPin

      pinMode(command[4],OUTPUT); //LatchPin

      // command[5] = Shiftsize (8,16...etc.)

      // command[6] = Shiftsize divided by 8, because of 8bit data packets?!

      // command[6+n] = Shiftarray in 8bit packets.

      for(int i=7;i < command[6];i++) 

      {

        for(int h=0;h <= 7;h++)

        {

          if(h=0)

          {

            bitWrite(data,h+((i-7)*8),(command & 0x01)); // (i-7)*8 for 16bit etc. shiftregisters

            shiftOut(command[2],command[3],MSBFIRST,data);

          }

          else

          {

            bitWrite(data,h+((i-7)*8),((command >> h) & 0x01));

            shiftOut(command[2],command[3],MSBFIRST,data);

          }

        }

      }

      digitalWrite(command[4], HIGH);

      digitalWrite(command[4], LOW);

      }

I wrote the code according to an example for shiftregisters (USK Circuit#12) and the case "writedigitalport"... the problem has to be my use of "command & >>...." since I have no idea how it works 😄

Or maybe its my VI... take a look. ^^

Thanks in advance!

[Nathan_B.]

The first thing that I notice is that in your VI, you are specifying 0d46 (46 as a decimal value) but in the firmware, command are specified in hex: 0x46.  So, to call the function in the firmware, you need to make sure that you are providing 0x46 and not 0d46 as the first element of the array.

[Tobbel]

Thanks!

Now the call works. But after some blinks of the data,clock,latch pin the data pin remains triggered.. and none of the leds connected to the shiftregister are glowing.

Do I convert and access the Boolean Array correctly?

[Nathan_B.]

Starting with your VI and the official documentation for ShiftOut(), I built a LIFA ShiftOut function.  Test it out and let me know if it works.

[Tobbel]

Thanks for the efforts... but same problem 😞

after some blinks of the latch/data/clock pins the data pin stays lightened but none of the shift-led's.

Your way should have worked... its easier to use a command for each shift_led, instead of accessing an array within the command.... but still no reaction of the led's.. mysterious.. (all is connected correctly... the starterkit_shiftexample and my way using the LIFO_digitalwrite commands works as well (but is very slow.. 130ms))

Not as easy as I thought to add a function on my own. 😄 

[Nathan_B.]

If you have an Arduino example that works with your shift registers, could you post it here?

[Tobbel]

Those VI's are fully functional for adressing a shiftregister with unknown size,... but with 110ms .. a little slow. Therefore a "LIFA Function" would be nice... ^^

[Nathan_B.]

It will always be slow if you try to do low level stuff through this abstraction layer.  I was asking for working Arduino code (not LIFA or LINX).  Also, maybe it would help if we knew what device you are actually using.