Initializing an ENC28J60

Feb 16, 2013 2 Replies
J

Hi,



I'm currently trying to convert a "NET-IO" board of the German shop "Pollin" into a Serial-to-LAN-adapter and learn something on the way (so "use the ethersex code" is not an option ;-).



I have disassembled the original code (which allows access to 8 digital outputs, 4 digital inputs and 4 analog inputs), have the datasheet and have also d/l-ed the ethersex code but no matter how hard I try, I do not get a single packet received! EPKTCNT stays 0 even if I ping a non-existent IP address (UC, MC, and BC are obviously ENabled!)



I have traced this back and I find that MARST is clear after a SOFT RESET, while it should be set according to the datasheet! So I gather that the MAC unit is not working.



My code looks like this (I hope the function names are self-explanatory):



/* Wait for ESTAT.CLKRDY */ while (!ENC28J60_RCR(REG_ESTAT) & (1


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J

Yes: "If the address specifies one of the MAC or MII registers, a dummy byte will first be shifted out the SO pin. After the dummy byte, the data will be shifted out MSb first on the SO pin."

So rather than "SPI_send(RCR | MACON2); macon2 = SPI_send(0);" I have to do "SPI_send(RCR | MACON2); SPI_send(0); macon2 = SPI_send(0);"

*then* the MARST bit comes out set!

Why I still do not see packets coming in is my next concern.

No worries, mate!

Josef

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J

I had inadvertedly set LOOPBK in MACON1, effectively short-circuiting the chip. That will teach me not to use symbolic names ;-)

I finally received some packets and already dumped one. It was great seeing MAC- and IP-address of a host in my network.

Josef

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