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Solved: AF Ethernet shield requires reset
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Solved: AF Ethernet shield requires reset

by jchristensen on Sun Mar 13, 2011 12:13 am

AHA! found this on p2 of the SPI application note for W5100 and W3150A+ (see the download tab on that page):
You should implement reset circuit or assert from MCU GPIO pin. Because the W5100 does not support Power-on-Reset, this pin should assert low for at least 2us when power is applied to the W5100.

Now I can sleep! :wink:

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Re: Solved: AF Ethernet shield requires reset

by stephanie on Mon Mar 14, 2011 1:45 pm

Thanks for sharing this solution! I've got a project that's been on the back-burner because I've had the same exact issue, with the project failing to start from a power-restore & needing a manual reset first.

In lieu of using a digital pin from the arduino (I've none to spare...) I'm figuring if I tie the Wiznet reset line to ground with a small cap, that ought to do the trick?
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