federicovaga / zio Goto Github PK
View Code? Open in Web Editor NEWLicense: GNU General Public License v2.0
License: GNU General Public License v2.0
Zio is "the ultimate I/O framework". It is being developed on the open hardware repository at http://www.ohwr.org/projects/zio . This version is known to compile and run with kernels 3.3 onwards (it used to work from 2.6.34 onwards, and we may fix the dev.id issue to restore such backward compatibility. This README in not updated very often, so please take this information with a grain of salt. The architecture of ZIO and the basic concepts are explained on www.ohwr.org/projects/zio/ (in particular the "files" and "documents" tabs). To test zio you need to load the core module: insmod zio.ko By detault ZIO uses "kmalloc" as a buffer, it is a simple buffer that hosts a list of data blocks, for either input or output. The default trigger is called "user", and it fires data transfers when the user reads or writes. We also have the "timer" trigger: it is a kernel-timer based trigger, that fires a block transfer on a timely basis. You can use the "ms" parameter to set the inter-block time, in milliseconds (the default is two seconds). You can also pass the "nsamples" parameter to say how many samples are acquired at each trigger instance. With the core in place, you can load a driver (we have several, this only shows the basics of zio-zero for input): insmod drivers/zio-zero.ko zio-zero has three channel sets. cset 0 has three channels. They simulate three analog inputs, 8-bits per sample. channel 0: returns zero forever channel 1: returns random numbers channel 2: returns a sawtooth signal (0 to 255 and back) The char devices are called using device-cset-channel: /dev/zio/zzero-0-0-ctrl /dev/zio/zzero-0-0-data /dev/zio/zzero-0-1-ctrl /dev/zio/zzero-0-1-data /dev/zio/zzero-0-2-ctrl /dev/zio/zzero-0-2-data To read data you can just cat, or "od -t x1" the data device. To get control information meta-information) together with data, you can use the "zio-dump" user-space utility, in this directory. For example: ./zio-dump /dev/zio/zzero-0-2-* This is the result with a trigger that uses 2000 as msec and 32 as nsample: ./zio-dump /dev/zio/zzero-0-2-* Ctrl: version 0.2, trigger timer, dev zzero, cset 0, chan 2 Ctrl: seq 1, n 32, size 1, bits 8, flags 01000001 (little-endian) Ctrl: stamp 1320403540.084798370 (0) Data: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f Data: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f Ctrl: version 0.2, trigger timer, dev zzero, cset 0, chan 2 Ctrl: seq 2, n 32, size 1, bits 8, flags 01000001 (little-endian) Ctrl: stamp 1320403542.091093781 (0) Data: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f Data: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f Ctrl: version 0.2, trigger timer, dev zzero, cset 0, chan 2 Ctrl: seq 3, n 32, size 1, bits 8, flags 01000001 (little-endian) Ctrl: stamp 1320403544.084790274 (0) Data: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f Data: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f zio-dump is able to access several pairs of devices (control and data), and you can change the trigger and buffer attributes for the cset. Example: echo 500 > /sys/zio/devices/zzero/cset0/trigger/ms-period echo 4 > /sys/zio/devices/zzero/cset0/trigger/nsamples echo 3 > /sys/zio/devices/zzero/cset0/chan0/buffer/max-buffer-len ./zio-dump /dev/zzero-0-* Ctrl: version 0.2, trigger timer, dev zzero, cset 0, chan 0 Ctrl: seq 102, n 4, size 1, bits 8, flags 01000001 (little-endian) Ctrl: stamp 4066.519285605 (0) Data: 00 00 00 00 Ctrl: version 0.2, trigger timer, dev zzero, cset 0, chan 1 Ctrl: seq 102, n 4, size 1, bits 8, flags 01000001 (little-endian) Ctrl: stamp 4066.519285605 (0) Data: 71 29 a6 53 Ctrl: version 0.2, trigger timer, dev zzero, cset 0, chan 2 Ctrl: seq 102, n 4, size 1, bits 8, flags 01000001 (little-endian) Ctrl: stamp 4066.519285605 (0) Data: 60 61 62 63
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.