Differences

This shows you the differences between two versions of the page.

--- ds:comedi [2015/08/04 11:24]
tmilosic created
+++ ds:comedi [2015/08/06 11:45]
tmilosic
@@ Line 1: / Line 1: @@
 ====== Comedi - The Linux Control and Measurement Device Interface  ======
+[[http://www.comedi.org|Comedi]] provides a common Linux interface to certain DAQ hardware, \\
+typical PCI digital and analog I/O cards and is actively developed since 1998.
+It consists of
+  * Linux drivers
+  * Comedilib
+  * Kcomedilib
+==== Drivers ====
+The newest sources for the Comedi and driver modules\\
+are available from the official Git repository.
+  git clone git://comedi.org/git/comedi/comedilib.git
+Use //autotools// to generate the //configure// script
+  ./autogen.sh
+To display all available options
+  ./configure --help
+[The following assumes you're in a maintenance chroot and are\\
+installing the modules directly to the diskless system.\\
+If you want to build and install the drivers to a different \\
+directory, for example '/srv/diskless/fec/arch/L866_64/lib/<kernel-version>/'\\
+you have to specify --with-modulesdir=<DIR>]
+Assembling the Makefile for 64-bit Linux 3.10.82-rt89 with RT preempt patch
+  ./configure --with-rtlinuxdir=/usr/src/kernels/3.10.82-rt89 \
+              --with-kernel-release=3.10.82-rt89 --with-rpm-target=x86_64
+Compiling
+  make
+Installing
+  make install
+This will install the modules to
+  /lib/modules/<kernel-version>/...
+where kernel-version is 3.10.82-rt89 in this example.
+=== Linux In-Tree Comedi Support ===
+Comedi and available drivers are also integrated into the Linux kernel \\
+since 2.6.30 located in the experimental staging tree.\\
+This might be the best choice unless the kernel version of choice\\
+lacks required hardware support or contains bugs stopping its use.\\
+In that case we should use the out-of-tree Git version as described above.\\
+To enable Comedi and build the //comedi// module, setup the \\
+kernel configuration as follows:
+  Device Drivers [*]
+      Staging drivers [*]
+          Data acquisition support <M>
+This ensures the built of the comedi module only.\\
+To actually make use of the supported hardware,\\
+the comedi //driver(s)// need to be set to build.\\
+Taking the [[ds:io_addi_data_cards|ADDI-DATA I/O PCI card 1648]] for example,\\
+activate the //Comedi PCI drivers// section and set the appropriate driver.
+              Comedi PCI drivers [*]
+                  ADDI-DATA APCI_16xx support <M>
+This will built the driver module addi_apci_16xx,\\
+which depends on the comedi module. \\
+When loaded, lsmod shows something like:
+  comedi                 46649  1 addi_apci_16xx
+Every device gets a separate //comedi[0-9]+// node in the device tree.\\
+Assuming only one card in this example
+  crw-rw---- 1 root root 98, 0 Aug  4  2015 /dev/comedi0
+To access the device, use the library Comedilib for user-space applications\\
+or Kcomedilib for real-time kernel modules making use of Comedi hardware.
+==== Comedilib ====
+Comedilib needs to be installed manually either via Git
+  git clone git://comedi.org/git/comedi/comedi.git
+or by getting the latest stable release tarball from the Comedi page
+  wget http://www.comedi.org/download/comedilib-0.10.2.tar.gz
+At time of writing 0.10.2 was the latest stable release.
+  > comedi_board_info
+  overall info:
+    version code: 0x00074c
+    driver name: addi_apci_16xx
+    board name: apci1696
+    number of subdevices: 3
+  subdevice 0:
+    type: 5 (digital I/O)
+    flags: 0x00030000
+    number of channels: 32
+    max data value: 1
+    ranges:
+      all chans: [0,5]
+    command:
+      not supported
+  subdevice 1:
+    type: 5 (digital I/O)
+    flags: 0x00030000
+    number of channels: 32
+    max data value: 1
+    ranges:
+      all chans: [0,5]
+    command:
+      not supported
+  subdevice 2:
+    type: 5 (digital I/O)
+    flags: 0x00030000
+    number of channels: 32
+    max data value: 1
+    ranges:
+      all chans: [0,5]
+    command:
+      not supported
+==== Kcomedilib ====
+Kcomedilib provides the Comedilib interface to the kernel space.\\
+This is useful when writing real-time kernel modules that need\\
+access to Comedi devices.
+==== Resources =====

GSI - BEA Wiki

User Tools

Site Tools

Differences

Page Tools