Ethernet shields, SPI and Macchina

This post will describe how to get Macchina talking with SPI shields, including Ethernet shields.

But first some Background:

When the Arduino Mega was introduced, for some reason, the SPI lines where in a different physical location than the Arduino UNO. This meant that several SPI-dependant shields were not compatible with both the Mega and the UNO without using some jumper wires.

MEGA SPI: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS).

UNO SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK).

Our solution to get around this, and allow for more compatibility between the Macchina and shields, was to add some solder-jumpers to the Macchina board. Now one can easily swap the SPI lines depending on what sort of shield is attached.

Flash forward a few years and the SPI pins have not moved, BUT it seems as though the official solution to this was to use a down-ward facing 2X3 ICSP header to make connection to SPI pins on ALL Arduino boards.

While laying out Macchina, we moved the ISCP header to make room for all the extra automotive interface stuff. This alone would not be an issue, except for the fact that some new shields (the Arduino Ethernet Shield for example) ONLY has these SPI pins on the down-ward facing ISCP header and no where else. This is an issue, a known issue.

Work-arounds are as follows:

1. If using the Official Ethernet shield: Need to add jumper wires to make correct connections. There are many ways to accomplish this including this solution that connects wires from the ICSP header to the side headers. Some soldering required.

2. Is using SEEEDSTUDIO's Ethernet Shield: Need to re-route the SPI lines by using the easier-to-do-than-soldering-wires method shown here:

Side note: Both of these boards are sold at Radioshack (!?) for about $32.

3. If using the Sparkfun-branded Ethernet Shield: No modifications necessary since wires are going directly to the SPI pins on the side headers.

Regardless of which of these shields are used, the solder jumpers on the Macchina must be set as follows:

Once hardware modifications are done, plug the shield into the Macchina and get coding!

A good first test would be to try out is the built-in example called "WebServer" that comes with the standard Arduino IDE.

Lastly, a note regarding SPI:

The CAN interface also uses SPI to communicate with the microcontroller. While the hardware is set up correctly (SS (chip select) for the CAN controller is connected to a un-used pin on microcontroller, special care must be taken with the code to ensure communication between Ethernet Microcontroller and CANBUS Microcontroller is handled correctly.

Comments

Submitted by ZooneZoone on Sat, 09/11/2021 - 09:41

Good website! I truly love how it is easy on my eyes it is. I am wondering how I might be notified whenever a new post has been made. I have subscribed to your RSS which may do the trick? Have a great day! Zwembadbouw

Submitted by ZooneZoone on Sat, 09/11/2021 - 09:56

Impressive web site, Distinguished feedback that I can tackle. Im moving forward and may apply to my current job as a  pet sitter, which is very enjoyable, but I need to additional  expand. Regards. Warmtepomp Affligem

Submitted by ZooneZoone on Sat, 09/11/2021 - 10:01

Excellent post. I was reviewing this blog continuously, and I am impressed! Extremely helpful information especially this page. Thank you and good luck. Tuinarchitect

Submitted by ZooneZoone on Sat, 09/11/2021 - 10:06

Thanks for a very interesting blog. What else may I get that kind of info written in such a perfect approach? I’ve a undertaking that I am simply now operating on, and I have been at the look out for such info. Warmtepomp Opwijk

Submitted by ZooneZoone on Sat, 09/11/2021 - 10:11

Took me time to read all the comments, but I really enjoyed the article. It proved to be Very helpful to me and I am sure to all the commenters here! It’s always nice when you can not only be informed, but also entertained! Polypropyleen zwembad

Submitted by ZooneZoone on Sat, 09/11/2021 - 10:22

I’m going to read this. I’ll be sure to come back. thanks for sharing. and also This article gives the light in which we can observe the reality. this is very nice one and gives indepth information. thanks for this nice article... Monoblok zwembad

Submitted by ZooneZoone on Sat, 09/11/2021 - 10:37

I am incapable of reading articles online very often, but I’m happy I did today.  It is very well written, and your points are well-expressed.  I request you warmly, please, don’t ever stop writing. Biotop zwemvijvers

Submitted by ZooneZoone on Thu, 09/16/2021 - 17:38

Only strive to mention one's content can be as incredible. This clarity with your post is superb! Thanks a lot, hundreds of along with you should go on the pleasurable get the job done. 파워볼

Submitted by ZooneZoone on Sun, 09/19/2021 - 15:00

This is my first time visit to your blog and I am very interested in the articles that you serve. Provide enough knowledge for me. Thank you for sharing useful and don't forget, keep sharing useful info: 먹튀검증

Submitted by ZooneZoone on Wed, 09/22/2021 - 08:07

I visit your blog regularly and recommend it to all of those who wanted to enhance their knowledge with ease. The style of writing is excellent and also the content is top-notch. Thanks for that shrewdness you provide the readers! 토토사이트

Submitted by ZooneZoone on Fri, 09/24/2021 - 18:20

Thank you for some other informative website. The place else may just I get that kind of information written in such a perfect method? I have a venture that I am simply now running on, and I’ve been at the glance out for such info. Zwembad aanleggen tuin

Submitted by ZooneZoone on Fri, 09/24/2021 - 18:59

This particular is usually apparently essential and moreover outstanding truth along with for sure fair-minded and moreover admittedly useful My business is looking to find in advance designed for this specific useful stuffs… SEO

Submitted by ZooneZoone on Fri, 09/24/2021 - 19:05

I am incapable of reading articles online very often, but I’m happy I did today.  It is very well written, and your points are well-expressed.  I request you warmly, please, don’t ever stop writing. SEO

Submitted by ZooneZoone on Sat, 09/25/2021 - 05:45

This is a great inspiring article.I am pretty much pleased with your good work.You put really very helpful information. Keep it up. Keep blogging. Looking to reading your next post. Dakisolatie

Submitted by ZooneZoone on Sat, 09/25/2021 - 05:49

Awesome article!  I want people to know just how good this information is in your article.  It’s interesting, compelling content.  Your views are much like my own concerning this subject. Vakantiehuis

Submitted by ZooneZoone on Sat, 09/25/2021 - 05:55

I know this is one of the most meaningful information for me. And I'm animated reading your article. But should remark on some general things, the website style is perfect; the articles are great. Thanks for the ton of tangible and attainable help. Vakantiehuis  België

Submitted by ZooneZoone on Sat, 09/25/2021 - 06:05

I am happy to find this post very useful for me, as it contains lot of information. I always prefer to read the quality content and this thing I found in you post. Thanks for sharing. SEO lead

Submitted by ZooneZoone on Sat, 09/25/2021 - 06:09

Succeed! It could be one of the most useful blogs we have ever come across on the subject. Excellent info! I’m also an expert in this topic so I can understand your effort very well. Thanks for the huge help. Lead generation

Submitted by ZooneZoone on Sat, 09/25/2021 - 06:19

Nice to be visiting your blog once more, it has been months for me. Well this article that ive been waited for therefore long. i want this article to finish my assignment within the faculty, and it has same topic together with your article. Thanks, nice share. Dakwerkers

Submitted by ZooneZoone on Sat, 09/25/2021 - 06:31

Positive site, where did u come up with the information on this posting?I have read a few of the articles on your website now, and I really like your style. Thanks a million and please keep up the effective work. Webdesign

Submitted by ZooneZoone on Sun, 09/26/2021 - 16:25

I think this is one of the most significant information for me. And i’m glad reading your article. But should remark on some general things, The web site style is perfect, the articles is really great : D. Good job, cheers 토토사이트

Submitted by ZooneZoone on Thu, 09/30/2021 - 16:07

If more people that write articles really concerned themselves with writing great content like you, more readers would be interested in their writings.  Thank you for caring about your content. Zonnepanelen Gent

Submitted by ZooneZoone on Thu, 09/30/2021 - 16:13

Thanks for an interesting blog. What else may I get that sort of info written in such a perfect approach? I have an undertaking that I am just now operating on, and I have been on the lookout for such info. Spoumuurisolatie

Submitted by ZooneZoone on Thu, 09/30/2021 - 16:25

It is my first visit to your blog, and I am very impressed with the articles that you serve. Give adequate knowledge for me. Thank you for sharing useful material. I will be back for the more great post. EPS

Submitted by ZooneZoone on Thu, 09/30/2021 - 16:31

The writer has outdone himself this time. It is not at all enough; the website is also utmost perfect. I will never forget to visit your site again and again. Webdesign

Submitted by ZooneZoone on Thu, 09/30/2021 - 16:36

Impressive web site, Distinguished feedback that I can tackle. Im moving forward and may apply to my current job as a  pet sitter, which is very enjoyable, but I need to additional  expand. Regards. Vakantiewoning

Submitted by ZooneZoone on Thu, 09/30/2021 - 16:41

Pretty good post. I just stumbled upon your blog and wanted to say that I have really enjoyed reading your blog posts. Any way I'll be subscribing to your feed and I hope you post again soon. Big thanks for the useful info. Zonnepanelen Oost-vlaanderen

Submitted by ZooneZoone on Thu, 09/30/2021 - 16:46

Took me time to read all the comments, but I really enjoyed the article. It proved to be Very helpful to me and I am sure to all the commenters here! It’s always nice when you can not only be informed, but also entertained! Warmtepomp installateur

Submitted by ZooneZoone on Thu, 09/30/2021 - 17:08

No doubt this is an excellent post I got a lot of knowledge after reading good luck. Theme of blog is excellent there is almost everything to read, Brilliant post. Pergola

Submitted by ZooneZoone on Thu, 09/30/2021 - 17:19

Wonderful blog! I found it while surfing around on Yahoo News. Do you have any suggestions on how to get listed in Yahoo News? I’ve been trying for a while but I never seem to get there! Appreciate it.  Webdesign

Submitted by ZooneZoone on Thu, 09/30/2021 - 17:24

There is so much in this article that I would never have thought of on my own.  Your content gives readers things to think about in an interesting way.  Thank you for your clear information. Zonnepanelen

Pages