Is anyone else having issues with the WizEthernet actually working?

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Is anyone else having issues with the WizEthernet actually working?

(24 posts) (9 voices)

Started 3 years ago by feurig
Latest reply from manitou

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manitou
Member

ventosus what compilers etc. are you using.

i'm building on linux box with maple-ide-v0.0.12 and using dinau's Ethernet lib with W5200 support for WIZ820io on Maple RET6.
As noted elsewhere, and my benchmarks confirm, maple SPI at 18 MHz is no faster than SPI at 9MHz using SPI.transfer() -- you need to go to DMA to get full clock speed SPI. Nevertheless, when I configure SPI2 to 18MHZ -- DHCP fails, and non-DHCP sketches behave erratically (e.g. TelnetClient). Even some maple crashes (flashing LED). Things are good at 9MHz.

thanks

Posted 3 years ago #
ventosus
Member

On linux here, too, using plain libmaple from git, unix toolchain, Maple Mini, dinau's lib with w5200 defines uncommented.

I only tested whether UDP works with 18MHz, not how fast it is, but I can confirm that it's no faster than with 9Mhz.

Here my benchmarks with this little sketch (http://pastebin.com/nGz0NV1N)

measuring time to trasmit 10000 UDP packets of size 1052 with SPI configured to different speeds.

MHz seconds MBits/s
18 40.7 2.07
9 40.7 2.07
4.5 47.1 1.79
2.25 68.5 1.23
1.125 104.8 0.80

I'll stick to 9Mhz for now until someone gets DMA support into dinau's port...

Posted 3 years ago #
mbolivar
LeafLabs

by the way, you should feel free to edit the wiki page to point to the new port, especially if it's better:

http://wiki.leaflabs.com/index.php?title=WizEthernet

we (leaflabs) mean for the wiki to be "community property" -- if you've got a better implementation for the wiz820io, then by all means let the wiki page reflect that fact!

Posted 3 years ago #
manitou
Member

for what it's worth, I think my problems with SPI at 18MHz is breadboard/noise problem. I tried shorter wires and twisted some of the SPI wires together and got WIZ820io working at 18MHz -- most of the time. :-) Electronics aren't my strength, maybe terminating resistors and/or capacitors could help??

I may take a look at DMA (based on SPI DMA SD library) ...

Posted 3 years ago #
manitou
Member
I still have problems with the WIZ820io not working -- LEDs are off, though I can still read the program registers via SPI (PHYSTatus is 0x23, it is 0x55 when it is working). Eventually, it starts working again. Though it has not connected to the net for more than a day now ?? I got DMA working, I think. At least I got some UDP transmit tests to work at 9MHz-SPI, transmitting 1k-byte packets at 6.1mbs. Here is w5100.cpp with the DMA mods (SPI2)
http://pastebin.com/iz9jSnUX
Since I can't keep the WIZ running, I don't have complete results but here is summary of three UDP tests. Column 1 is time in microseconds for 8-byte echo. Column 2 is data rate for sending 1000-byte UDP packets. Column 3 is the time for receiving 10 1000-byte packets with no loss. Data for SPI only and a few SPI-DMA results for various SPI frequencies.
```
SPI only
1.125MHz 2414   .8       .7 mbs
2.25MHz  1565  1.23    1.3mbs
4.5MHz   1186  1.7     1.6mbs
9MHz     1011  2.0     1.9mbs
18MHz  TBD

  SPI+DMA
1.125MHz  ?
2.25MHz  ?
4.5MHz 1234
9MHz   1002  6.1 mbs
18MHz ?

 arduino 022                        v1 ide
8MHz 420us   3.2mbs  3.4mbs        656us  3.16mbs  3.2mbs
4MHz 528us   2.25mbs 2.4mbs        900    2.22mbs  2.2mbs
2MHz 792     1.4     1.4          1356    1.4      1.3
1MHz 1388     .8      .8          2376     .79      .7
```
The old W5100 chip does not have a burst read/write, so it takes 4 SPI ops per data byte, so at 4MHz, data rate would not exceed 0.38 mbs.
Posted 3 years ago #
ventosus
Member

hi manitou

Me too implemented SPI over DMA for the W5200 chip, although I did not modify the Arduino lib, but have written a small C lib instead that just supports UDP reading and writing over DMA. Here the WIZ820io works flawlessly.

7.3MBit/s @9Mhz
12.4MBit/s @18Mhz

How do you connect the wiz820io to your Maple? My connection is as follows:
WIZ820io Maple Mini
Gnd Gnd
Vcc Vcc
MOSI MOSI (SPI2)
MISO MISO (SPI2)
SCK SCK (SPI2)
SS SS (SPI2)
nRESET RESET
PWDN Gnd
nINT (not used)

Example sketch and dma_udp lib can be found here:
http://pastebin.com/pZX2YTjh
http://pastebin.com/Xx1ex0S6
http://pastebin.com/K4nCcaqG
http://pastebin.com/GmBCXUYt

Posted 3 years ago #
manitou
Member
OK, I think the problem was I had PWDN unconnected. (In my defense :-), I started testing WIZ820io with wizEthernet lib and it had all the Wiz pins hooked to the mcu pins, including, RESET, PWDN, and INTERRUPT. I started pulling wires to see which of those pins were necessary. "At the time", it worked with PWDN unconnected. In fact the Wiz site has a drawing for wirings to Arduino, and they show PWDN unconnected.) Thanks for helping and posting your custom UDP/DMA code. It is faster than the DMA mods I made to dinau's library. Here's an update to my table above
```
SPI
1.125MHz 2414 .8  .7 mbs
2.25MHz  1565 1.23 1.3mbs
4.5MHz   1186 1.7 1.6mbs
9MHz     1011 2.0  1.9mbs
18MHz    1011 2.0  1.9mbs

DMA
4.5MHz 1234  2.8 3.3mbs
9MHz   1002  6.1  5.5mbs
18MHz  992  9.2mbs 7.8mbs
```
Now the only mystery I have is that my DMA version doesn't work at 1.125MHz or 2.5MHz.
Posted 3 years ago #
manitou
Member

Alas, even with PWDN to ground the WIZ820io is still misbehaving -- not lighting LEDs.
For what it's worth, the schematic shows the PWDN with a pulldown resistor to ground, so I don't think you have to connect PWDN. Even though the LEDs are off (link not up), my sketch can set the IP ddress etc. (I read the low memory off the WIZ and can see that values have been set, and the PHY linkstatus is also 0 (down) at 0x35. Bit 5 is high when the link LED is lit) So I still have some sort of intermittent electrical or device problem. The ether cable/port works to other devices (beaglebone)

at least it stayed up long enough to complete my benchmarks ...

Posted 3 years ago #
manitou
Member
Using ventosus UDP/DMA lib, I confirmed his faster UDP transmit times (in mbs, megabits/second) for 10 1000-byte UDP sends at various SPI Hz
```
1.125MHz  1.04mbs
2.25MHz   2.03mbs
4.5MHz    3.9mbs
9MHz      7.1mbs
18MHz    12.1mbs
```
and that library works at the slower SPI rates. I think my mods to dinau's library don't work at slower SPI rates, because I'm only using DMA for the "block" transfers, and still using discrete SPI transfers for command and control. Not sure why that causes a problem at slower SPI rates. but ventosus UDP lib uses DMA for ALL communications with WIZ
Posted 3 years ago #

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