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Pin connection error Using a 74HC165 and bit banging SPI

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Posted by Acastlenut   Australia  (1 post)  [Biography] bio
Date Sat 05 Jul 2014 12:17 PM (UTC)
Message
Hi Nick. I find your solutions to coding for the Arduino brilliant. However in your article on Bit Banging a 74HC165 there is an error in the pin designations.

On your page: http://www.gammon.com.au/forum/?id=11979 you have the following pin connections:

// Chip pin 1 (/PL) goes to LATCH (D8)
// Chip pin 2 (CP) goes to SCK (D6)
// Chip pin 9 (Q7) goes to MISO (D7)

It should be:

// Chip pin 1 (/PL) goes to LATCH (D8)
// Chip pin 2 (CP) goes to SCK (D7)
// Chip pin 9 (Q7) goes to MISO (D6)

It had me going for a while then I dug out my trusty Intronix LA1034 Logic Analyzer.

Cheers
Eric (acastlenut)
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Posted by Nick Gammon   Australia  (21,321 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Sat 05 Jul 2014 08:42 PM (UTC)

Amended on Sat 05 Jul 2014 08:47 PM (UTC) by Nick Gammon

Message
Thanks for the update. This line was correct*:


bitBangedSPI bbSPI (bitBangedSPI::NO_PIN, 6, 7);  // MOSI, MISO, SCK


It just didn't match the comments above. I have corrected them.





* Depending on how you look at it. Alternatively the comments were right and that line was wrong. :)

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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