2014年6月15日 Raspberry PiでGPIOにアクセスするプログラムを実行しようとするエラーになる. $ ruby sample1.rb bcm2835_init: Unable to open /dev/mem: 

If the library runs with effective UID of 0 (ie root), then bcm2835_init() will attempt to open /dev/mem, and, if successful, it will permit use of all peripherals and library functions. If the library runs with any other effective UID (ie not root), then bcm2835_init() will attempt to open /dev/gpiomem, and, if successful, will only permit GPIO operations.

Could you tell me how to grant vmware permission to read /dev/mem without compromising system security? I'm asking because workstation can be very slow to start, can lock the desktop if I try to load 2 copies (or player and workstation simultaneously) that requires me to ssh in and kill vmware-vmx. Because HiPi::BCM2835 accesses the SOC registers directly via /dev/mem, it must run with the necessary root privileges to gain access to /dev/mem. This means you must start your Perl script with root privileges using sudo or from the root account.

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2020-02-20 I am trying to run an Express API server with sudo permissions and have it automatically start on boot. The API needs access to bcm2835 library, and I get the following when trying to run node server.js. bcm2835_init: Unable to open /dev/mem: Permission denied /home/pi/Documents/node_modules/rpio/lib/rpio.js:104 return bindfunc(optarg); 2009-11-03 /dev/mem can only be opened by processes with CAP_SYS_RAWIO; head, not running as root, doesn’t have that capability. You can “fix” this using setcap (but only do this on a copy of the binary): cp /usr/bin/head . sudo setcap cap_sys_rawio+ep head ./head /dev/mem | hexdump -C If the host OS permissions do not allow us to read /dev/mem, we will fall back to using the host's identifier (usually its IP address) as the key to determine the VM's location.

bcm2835_init: Unable to open /dev/mem: Permission denied. pi@Collatinus ~/Development/Cprog $ sudo ./pi-liter-test. When I combine them in one program this happends: pi@Collatinus ~/Development/Cprog $ ./helloWorld-pi-liter. bcm2835_init: Unable to open /dev/mem: Permission denied.

If you do that you will get the following error: pi@raspberryfai ~/rpi-mems-sensor $ ./test bcm2835_init: Unable to open /dev/mem: Permission denied Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time. Hi Arjan and thanks for your answer.

I noticed that bcm2835 release 1.52 solved the problem allowing to use /dev/memgpio instead of /dev/men, thus not requiring root access. so to make node-red-contrib-dht-sensor work i ha d to do this : uninstall old bcm2835.1.38 (simply remove directory install and make new release 1.52 uninstall node-red-contrib-dht-sensor using :

Important You must be logged on as an administrator to change permissions on files and folders. wiringPiSetup: Unable to open /dev/mem: Too many open files please show me some footmarks of yours on this problem Gordon on September 25, 2013 at 8:43 am said: [root@netqe7 ~]# chown testuser /dev/hugepages/rtemap* [root@netqe7 ~]# chown testuser /dev/hugepages [root@netqe7 ~]# sudo -u testuser testpmd -w 0000:03:00.0 -v -- -i EAL: Detected 16 lcore(s) EAL: Detected 2 NUMA nodes EAL: RTE Version: 'DPDK 19.11.0' EAL: Multi-process socket /tmp/dpdk/rte/mp_socket EAL: rte_mem_virt2phy(): cannot open /proc/self/pagemap: Permission denied EAL: Selected dmesg shows [ 851.749253] NVLINK: Nvlink Core is being initialized, major device number 247 [ 851.749466] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:01:00.0 on minor 1 [ 851.749474] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 355.11 Wed Aug 26 16:35:41 PDT 2015 Xorg file shows [ 12596.126] (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied [ 12596.131 Hi, Running VMplayer 3.0.0 build-203739 on Fedora 12 works with the 2.6.31 kernels, but with the 2.6.32 kernels, vmplayer crashes on startup.

the sensors connected to GPIOs.
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That's because there is no permission to acces the GPIO, but is there a way to go around that? Because I'm making a website that runs on a raspberry pi 4 that set's some outputs and counts some inputs.

The GPIO may be configured as inputs, outputs, or to generate Servo or PWM pulses.
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I'm trying to read physical memory as a non-root user using /dev/mem. Checking the permissions of /dev/mem: ~/w/e/setup ls -lha /dev/ | grep mem crw-r----- 1 root kmem 1, 1 Oct 15 09:29 mem From my understanding, a member of the kmem group should be allowed to read from /dev/mem. I check my group memberships:

BCM2835是一个树莓派开源的驱动库，它提供了树莓派板上J8排针上引出的GPIO的操作接口，包括IIC、SPI、PWM等驱动程序样例。. 以下是在使用的过程中对该库的源码分析总结。. 首先先来介绍一下该库的C文件组成。.

Many thanks for you quick reply. Could you tell me how to grant vmware permission to read /dev/mem without compromising system security? I'm asking because workstation can be very slow to start, can lock the desktop if I try to load 2 copies (or player and workstation simultaneously) that requires me to ssh in and kill vmware-vmx.

so to make node-red-contrib-dht-sensor work i ha d to do this : uninstall old bcm2835.1.38 (simply remove directory install and make new release 1.52 uninstall node-red-contrib-dht-sensor using : Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.Provide details and share your research! But avoid ….

the sensors connected to GPIOs.