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<span>Hey, no worries. The only indication to me was the very brief reference to it in the forum post i linked to, and the line in the firmata.h file:<br>
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<div>#define SHIFT_DATA 0x75 // a bitstream to/from a shift register<br>
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<div>So thought I’d ask on the off chance it was an undocumented feature . . .<br>
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<div>I'm sure it is possible to hack together the shiftOut() function in pd, though as I’m not a programmer how to do that is not immediately obvious to me,* so guess i was hoping that there was a ‘proper’ or more efficient way to do it via pduino.
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<div>As you suggest it’s probably better to do the shift register stuff directly on the arduino, but i’m already in quite deep with pduino for this particular project. .
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<div>anyway, thanks for your replies ! <br>
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<div><span>*source code for shiftOut():<br>
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<div>void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)<br>
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<div>{<br>
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<div>uint8_t i;<br>
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<div>for (i = 0; i < 8; i++) {<br>
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<div> if (bitOrder == LSBFIRST)<br>
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<div> digitalWrite(dataPin, !!(val & (1 << i)));<br>
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<div> else <br>
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<div> digitalWrite(dataPin, !!(val & (1 << (7 - i))));<br>
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<div> <br>
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<div> digitalWrite(clockPin, HIGH);<br>
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<div> digitalWrite(clockPin, LOW); <br>
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<div>}<br>
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<span>}</span><br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Pd-list <pd-list-bounces@lists.iem.at> on behalf of Roman Haefeli <reduzent@gmail.com><br>
<b>Sent:</b> Monday, 1 July 2019 3:21 AM<br>
<b>To:</b> pd-list@lists.iem.at<br>
<b>Subject:</b> Re: [PD] Pduino and shift registers</font>
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<div class="PlainText">On Sat, 2019-06-29 at 14:23 +0200, Simon Iten wrote:<br>
> i think you should be able to control a shift register<br>
> from pd within the existing architecture.<br>
> <br>
> if you can access those 3 pins from pd just send them the HIGHs and<br>
> LOWs you would send in arduino code…<br>
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Theoretically yes, but it's probably slow and unreliable. If you could<br>
just send the desired bit states from Pd and let the Arduino deal with<br>
timing and ordering, data transmission would have less overhead would<br>
likely be more reliable.<br>
<br>
One could still write a little code snippet for the Arduino and an<br>
complementary abstraction based on comport to do something like this.<br>
Right now, I would not know how to make that part of Firmata and<br>
pduino.<br>
<br>
Roman<br>
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