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I have already seen the questions: Does SPI port work on Raspberry B+ and SPI module on Raspberry Pi 2, but they don't answer my question.

I can't seem to get the SPI port working on my Raspberry Pi 2. Using a logic analyser connected to the pins, I can't get any signals from it, using spincl or by echo -ne "\x01\x02\x03" > /dev/spidev0.1

When I try to enable it with raspi-config, I get the following error:

modprobe: ERROR: could not insert 'spi_bcm2708': No such device
  • My /etc/modprobe.d/raspi-blacklist.conf is empty
  • /boot/config.txt contains dtparam=spi=on and dtoverlay=spi-bcm2835
  • /proc/cpuinfo contains Hardware : BCM2709
  • lsmod contains spi_bcm2835

Here is the output of several commands:

ls /dev/spidev*
/dev/spidev0.0  /dev/spidev0.1

uname -a
Linux raspberrypi 4.1.15-v7+ #830 SMP Tue Dec 15 17:02:45 GMT 2015 armv7l GNU/Linux

I'm a little confused about the fact that the hardware is listed as 2709, but it seems to be giving an error about 2708. Is this the reason the SPI isnt working?

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Rocketmagnet
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2 Answers2

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SPI now uses the spi_bcm2853 module. spi_bcm2708 is deprecated.

You should see SPI activity with echo -ne "\x01\x02\x03" > /dev/spidev0.1

If you don't you are monitoring the wrong GPIO.

My piscope may help if the SPI bus speed is circa 100 kbps.

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joan
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I got it working on a Pi 3 after some time, I already thought I had an error in cabling or soldering. It would load the spi_bcm2853 by default, but that was not working. I added dtoverlay=spi-bcm2708 to /boot/config.txt and after a reboot the cards were recognized. The used device is /dev/spidev0.0 tho, not 0.1. All cables go to pins 17 up to 24 (18 not connected):

spi cabling

The result from the Read.py:

Read.py

ott--
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  • good answere, i want to add that you can also change the pins when overlaying, just in case you hardwired something or haven't enough space on gpio: dtoverlay=lirc-rpi,gpio_out_pin=17,gpio_in_pin=13 as an example – clockw0rk Oct 27 '21 at 14:45