These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.īut a few days later on September 26th, 2010 it had been changed to say: In terms of what is wrong with the web page, if we examine 's records for the page of the comparable Duemilanvoe, on September 15th, 2010 it said: In terms of components, the Nano it is very nearly just a form-factor shrink of the discontinued Duemilanove, and in the current version updated to an an ATmega328p it has capabilities essentially comparable to an Uno, differing primarily the in the USB interface which has nothing to do with SPI. The information you found that seems to suggest something to the contrary is simply a result of the fact that that the web page for the Nano is sadly out of date date and does not reflect the current state of the Arduino libraries which support SPI on this processor and hence board. Yes, the Nano supports SPI when used with a modern Arduino version, and no, you do not have to do anything special to utilize it on this board.
#Arduino 1.8.5 does not support software
But that still isn't satisfactory, and it is the opposite conclusion from that of the other questions: The hardware is all there and the software framework is in place, so what does one need to do to make SPI work on the Arduino Nano? Why is it that some sources say it works while others say it doesn't? So, I am inclined to believe the Arduino product page when they say it isn't supported. SPI devices did not work on that board, including the same radio module mentioned in the question linked to above. I figured it would be worth it to buy a Nano 3 and see if it worked. In this question, the OP's premise is that their SPI device works on the Nano but not on other boards this seems to be a strong indication that SPI does work.
But that answer does not definitively answer the question of whether SPI does work, and it doesn't explain any caveats that one may come across. Someone asked a similar question on Stack Overflow and was told that it should work with the same level of support as I 2C, even if it isn't built in to the core framework. Yet I have also seen mention of SPI working on this board, or at least people saying that it should. These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language. The problem is that I have seen mention of SPI not working on the Nano. I wanted to get the size down a bit, so I was thinking I might buy an Arduino Nano and re-wire my system around that. I recently prototyped and programmed a system that used some SPI sensors on an Arduino Uno.
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