mmap error -1 ?

[fxw]

Hello guys,

I need help to connect a LED Matrix 32x16 on a Adafruit HAT with RPI2...

After compiling, i'm trying to launch the first test but it's a failed...

sudo ./led-matrix -r 32 -c 2 -t 60 -D 1 runtext.ppm mmap error -1

Any suggestions about debuging that ? Is it a problem with the Adafruit and all soldering made or may be the cable between the adafruit HAT and the LED matrix ?

Many thanks for your help

[hzeller]

The program has not been called led-matrix for a long time, but examples-api-use/demo, so I suspect you are using a very old version of this library. If you are using a Raspberry Pi 3, that will not work as there are some detection issues regarding the GPIO mmap area; please do a fresh checkout and go from there. For the Pi2 it should be working, but still it sounds like you are using a very ancient version.

If you have an Adafruit HAT and not use the native wiring, you need to give the command line option --led-gpio-mapping=adafruit-hat (see https://github.com/hzeller/rpi-rgb-led-matrix#if-you-have-an-adafruit-hat ).

[fxw]

Hello,

Many thanks for your help, but it's not working with that also..

Below some details...

I'm using a RPI2, the adafruit HAT and the matrix was bought on aliexpress and I compiled with the option HARDWARE_DESC=adafruit-hat...

root@pi:~/rpi-rgb-led-matrix-master# sudo make clean rm -f *.o led-matrix minimal-example text-example rgbmatrix.so make -C lib clean make[1]: Entering directory '/root/rpi-rgb-led-matrix-master/lib' rm -f gpio.o led-matrix.o framebuffer.o thread.o bdf-font.o graphics.o librgbmatrix.a make[1]: Leaving directory '/root/rpi-rgb-led-matrix-master/lib' root@pi:~/rpi-rgb-led-matrix-master# sudo make g++ -Iinclude -Wall -O3 -g -fno-strict-aliasing -DADAFRUIT_RGBMATRIX_HAT -c -o demo-main.o demo-main.cc make -C lib make[1]: Entering directory '/root/rpi-rgb-led-matrix-master/lib' g++ -I../include -Wall -O3 -g -DADAFRUIT_RGBMATRIX_HAT -c -o gpio.o gpio.cc g++ -I../include -Wall -O3 -g -DADAFRUIT_RGBMATRIX_HAT -c -o led-matrix.o led-matrix.cc g++ -I../include -Wall -O3 -g -DADAFRUIT_RGBMATRIX_HAT -c -o framebuffer.o framebuffer.cc g++ -I../include -Wall -O3 -g -DADAFRUIT_RGBMATRIX_HAT -c -o thread.o thread.cc g++ -I../include -Wall -O3 -g -DADAFRUIT_RGBMATRIX_HAT -c -o bdf-font.o bdf-font.cc g++ -I../include -Wall -O3 -g -DADAFRUIT_RGBMATRIX_HAT -c -o graphics.o graphics.cc ar rcs librgbmatrix.a gpio.o led-matrix.o framebuffer.o thread.o bdf-font.o graphics.o make[1]: Leaving directory '/root/rpi-rgb-led-matrix-master/lib' g++ -Wall -O3 -g -fno-strict-aliasing demo-main.o -o led-matrix -Llib -lrgbmatrix -lrt -lm -lpthread g++ -Iinclude -Wall -O3 -g -fno-strict-aliasing -DADAFRUIT_RGBMATRIX_HAT -c -o minimal-example.o minimal-example.cc g++ -Wall -O3 -g -fno-strict-aliasing minimal-example.o -o minimal-example -Llib -lrgbmatrix -lrt -lm -lpthread g++ -Iinclude -Wall -O3 -g -fno-strict-aliasing -DADAFRUIT_RGBMATRIX_HAT -c -o text-example.o text-example.cc g++ -Wall -O3 -g -fno-strict-aliasing text-example.o -o text-example -Llib -lrgbmatrix -lrt -lm -lpthread g++ -Iinclude -Wall -O3 -g -fno-strict-aliasing -DADAFRUIT_RGBMATRIX_HAT -c -o rgbmatrix.o rgbmatrix.cc g++ -s -shared -lstdc++ -Wl,-soname,librgbmatrix.so -o rgbmatrix.so rgbmatrix.o -Llib -lrgbmatrix -lrt -lm -lpthread

But I got the same error...

root@pi:~/rpi-rgb-led-matrix-master# ./minimal-example mmap error -1

root@pi:~/rpi-rgb-led-matrix-master# sudo ./text-example -f fonts/8x13B.bdf -y1 -x1 -c1 -r16 -C0,0,255 mmap error -1

Any another(s) idea(s) ?

[hzeller]

what operating system image are you using?

[fxw]

uname -a Linux pi 4.9.0-2-rpi2 #1 SMP Raspbian 4.9.13-1+rpi3 (2017-05-18) armv7l GNU/Linux

[hzeller]

Can you add a line perror("mmap: ") right at the beginning of the if block here

https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/lib/gpio.cc#L191

.. re-compile and run again ? It should then output a more detailed message. Please update the bug here with that.

Maybe there is a weird reason that your Pi is not properly recognized ? Can you tell me what the output of cat /proc/cmdline is printing for you ?

[hzeller]

Also, don't use the -DADAFRUIT_RGBMATRIX_HAT thing, that is an ancient compile option. It should actually have output a warning in the compile.

Either use HARDWARE_DESC=adafruit-hat in the Makefile or simply use the --led-gpio-mapping=adafruit-hat command line flag, no need to mess with it at compile time anymore.

Looking at your compile output, you are still compiling a very old version. There is for instance the hardware-mapping.o compilation missing or options-initialize.o. Make sure to have a fresh checkout of this library.

The minimal example and the text-example are in the examples-api-use/ directory, so you have to go in there first before executing the binary; not sure what you are doing above.

So long story short: make sure to have a current checkout of this library, otherwise it is hard to debug what is going on.

[fxw]

root@pi:~/rpi-rgb-led-matrix/examples-api-use# cat /proc/cmdline bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 elevator=deadline root=/dev/mmcblk0p2 rootfstype=ext4 rootwait

[fxw]

I checkout the lastest version of the project, compile with HARDWARE_DESC=adafruit-hat in the Makefile... Compile the example project, i got now :

root@pi:~/rpi-rgb-led-matrix/examples-api-use# ./demo -t 10 -D 1 runtext.ppm mmap: : Operation not permitted mmap error 0xffffffff

[fxw]

root@pi:~/rpi-rgb-led-matrix/lib# ls -lrth total 2,4M -rw-r--r-- 1 root root 3,9K janv. 5 22:26 graphics.cc -rw-r--r-- 1 root root 5,3K janv. 5 22:26 framebuffer-internal.h -rw-r--r-- 1 root root 17K janv. 5 22:26 framebuffer.cc -rw-r--r-- 1 root root 4,8K janv. 5 22:26 content-streamer.cc -rw-r--r-- 1 root root 6,4K janv. 5 22:26 bdf-font.cc -rw-r--r-- 1 root root 1,9K janv. 5 22:26 utf8-internal.h -rw-r--r-- 1 root root 6,7K janv. 5 22:26 transformer.cc -rw-r--r-- 1 root root 1,9K janv. 5 22:26 thread.cc -rw-r--r-- 1 root root 17K janv. 5 22:26 options-initialize.cc -rw-r--r-- 1 root root 7,8K janv. 5 22:26 led-matrix-c.cc -rw-r--r-- 1 root root 14K janv. 5 22:26 led-matrix.cc -rw-r--r-- 1 root root 1,4K janv. 5 22:26 hardware-mapping.h -rw-r--r-- 1 root root 6,9K janv. 5 22:26 hardware-mapping.c -rw-r--r-- 1 root root 6,4K janv. 5 22:27 Makefile -rw-r--r-- 1 root root 60 janv. 5 22:27 compiler-flags -rw-r--r-- 1 root root 19K janv. 5 22:31 gpio.cc -rw-r--r-- 1 root root 112K janv. 5 22:31 gpio.o -rw-r--r-- 1 root root 137K janv. 5 22:31 led-matrix.o -rw-r--r-- 1 root root 105K janv. 5 22:31 options-initialize.o -rw-r--r-- 1 root root 98K janv. 5 22:31 framebuffer.o -rw-r--r-- 1 root root 12K janv. 5 22:31 thread.o -rw-r--r-- 1 root root 82K janv. 5 22:31 bdf-font.o -rw-r--r-- 1 root root 44K janv. 5 22:31 graphics.o -rw-r--r-- 1 root root 113K janv. 5 22:31 transformer.o -rw-r--r-- 1 root root 70K janv. 5 22:31 led-matrix-c.o -rw-r--r-- 1 root root 3,9K janv. 5 22:31 hardware-mapping.o -rw-r--r-- 1 root root 57K janv. 5 22:31 content-streamer.o -rw-r--r-- 1 root root 844K janv. 5 22:31 librgbmatrix.a -rwxr-xr-x 1 root root 529K janv. 5 22:31 librgbmatrix.so.1

[fxw]

@hzeller any suggestions ? :(

[hzeller]

It sounds like you have an unusual set-up in which your Pi does not allow to memory map the right area in memory. Can you try a current Raspbian image on your Pi to see if that changes ?

[fxw]

Hey Henner ! You rock ! It's working very well with a fresh install 👍 💯

Now i will play all the night with that :) Thanks !!!