SPI connections

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

You have a real talent for writing unique content.  I like how you think and the way you express your views in this article.  I am impressed by your writing style a lot. Thanks for making my experience more beautiful. Call girls Pakistan

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... Escorts in Islamabad

You delivered such an impressive piece to read, giving every subject enlightenment for us to gain information. Thanks for sharing such information with us due to which my several concepts have been cleared. Escorts in Pakistan

Fantastic blog! Do you have any tips and hints for aspiring writers? I’m planning to start my own website soon but I’m a little lost on everything. Would you propose starting with a free platform like WordPress or go for a paid option? There are so many options out there that I’m completely overwhelmed .. Any suggestions? Many thanks! Prostitutes in Islamabad

Apollo hugs Rebecca and rides her in front of her and runs with Marina.It's starting to go.Jun and Shuri were riding horses to Rick's house. JUN doesn't talk much.I was riding a horse. Let's move on for about an hour as the feel tells us.https://andamenti.com/ - 샌즈카지노

disappeared and there was a quiet crossroads. They turn left and do it again.You've gone a long way.Soon, a small house appeared. The lights were off because there were no people.AllThe feel shouted out loud.https://dongahtv.com/ - 샌즈카지노주소

This is very interesting content! I have thoroughly enjoyed reading your points and have come to the conclusion that you are right about many of them. You are great. Bilgi Sitesi

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. Araç Değer Kaybı

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! https://ritzz.net/

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. https://www.bestwatchwinder.com/

Nice post. I was checking constantly this blog and I’m impressed! Extremely useful info specially the last part   I care for such information a lot. I was seeking this certain info for a long time come my web site https://onetoto365.com

Thanks for sharing nice information with us. i like your post and all you share with us is uptodate and quite informative, i would like to bookmark the page so i can come here again to read you, as you have done a wonderful job. 릴게임

I was surfing net and fortunately came across this site and found very interesting stuff here. Its really fun to read. I enjoyed a lot. Thanks for sharing this wonderful information. สล็อต

I recently came across your blog and have been reading along. I thought I would leave my first comment. I don't know what to say except that I have enjoyed reading. Nice blog. I will keep visiting this blog very often. 토토사이트

I am continually amazed by the amount of information available on this subject. What you presented was well researched and well worded in order to get your stand on this across to all your readers. 토토사이트

Please let me know if you’re looking for a article writer for your site. You have some really great posts and I feel I would be a good asset. If you ever want to take some of the load off, I’d absolutely love to write some material for your blog in exchange for a link back to mine. Please send me an email if interested. Thank you! Avukat Ankara

Pages