SPI module on Raspberry Pi 2 not working

Question

I followed all steps on SPI module on Raspberry Pi 2, without success, no way to make this work on a Pi2...

On /boot/config/txt there is:

dtparam=spi=on
dtoverlay=spi-bcm2835

On /etc/modules:

spi-bcm2835

Blacklist file is empty. lsmod returns

spi_bcm2835             7216  0

ls /dev/spi* returns:

/dev/spidev0.0  /dev/spidev0.1

But still I get no electric activity on any SPI pin. Connected a scope on SCK pin (pin #23, GPIO11/SPI_CLK) and nothing. Tryed :

echo -ne "\x01\x02\x03" > /dev/spidev0.0

and also run the spi_test application (returns all zeroes).

Any hint on what I am doing wrong?

The Pi is running latest version of raspbian

Could you post a link to the 'other SPI module post' you mention in your first sentence? — goobering, Feb 29 '16 at 14:21
Does it work without the /etc/modules entry? I thought the DT was an alternative way to load modules. — PaulF8080, Apr 01 '16 at 13:57
Yes, it is, but unfortunately I'm not quite familiar with DT syntax and wasn't able to make it work that way. — Luiz Cressoni, Apr 04 '16 at 14:51

score 3 · Answer 1 · answered Mar 01 '16 at 13:02

3

Just adding the pi user to the spi group solved the problem:

sudo adduser pi spi

Running the spi_test program after that all went OK.

answered Mar 01 '16 at 13:02

Luiz Cressoni

Are the pin outs different on version 1 and 2 of the pi ? – Robin Dec 17 '18 at 16:40

1 Answers1