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Long version:

I have a very odd problem: I connected a Mifare MFRC 522 RFID Reader to my raspberry Pi (it handles communication via SPI). For that I used one of the many Tutorial already on the Internet. At first everything worked fine but after a few days the Reader didn't detect the rfid chips anymore. I was stuck on this for a few weeks, but now i found out, that after a downgrade to Raspbian wheezy, everything works fine and the upgrade to jessie/testing breaks the readers ability to detect rfid chips.

I have seen Threads claiming that enableing SPI + device Tree in raspi-config would solve SPI problems, but it did nothing for me. Unfortunately i need the newest raspbian version, so staying on wheezy is not an option.

Does anybody have a Idea how i can fix or how i can get to the bottom of this problem?

TLDR:

RFID Reader works in Raspbian wheezy, upgrading to jessie+ makes it not detecting cards. Enableing SPI+Device Tree in raspi-config did not help.

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  • maybe you had installed some driver that you forgot to reinstall on when changing to Jessie. Also be sure to have make a clean install when moving from wheezy to jessy just in case. I dont know much more – Nicolas Manzini Nov 16 '15 at 18:19
  • thanks for the comment. I did a clean raspbian jessie install on another SD card, and the reader was still broken. – Zven Baum Nov 16 '15 at 18:35
  • I am in the same situation. Tests show that SPI is working. I have dtoverlay=spi-bcm2708 and dtparam=spi=on on my /boot/config.txt. I assume you also did that? – PiEnthusiast Dec 2 '15 at 13:20
  • I've got it working in Raspbian Jessie on a Pi 3: Linux raspberrypi 4.1.19v7-aufs #1 SMP Sun Mar 13 12:48:13 CET 2016 armv7l GNU/Linux. See raspberrypi.stackexchange.com/questions/40829/… for more. – ott-- May 16 '16 at 16:46
  • I assume that you check /dev for SPI ports and there no port. Did you check any configuration in uEnv.txt? cd /boot sudo nano /uEnv.txt – acs May 25 '16 at 20:18

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