Programming :: Write USB Device Driver?
Oct 11, 2010
I know, I know..."How long is a piece of string"?
I have one of these devices:
[URL]
Of course, it's Windows only, and XP only at that. However, the data that needs transferred between the device and the computer should be fairly basic, unless it offloads a lot of processing to the computer. I'm not a programmer, nor do I play one on TV, but I have written some fairly complicated microcontroller programs and some basic Java GUIs. Besides writing the actual code, how hard is it to do whatever needs done to make a Linux device driver, apart from the code to make the device work?
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Apr 6, 2010
If I were asked to write a linux device driver for a pen, How should I start?
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Jul 9, 2010
Quote:
Originally Posted by anishakaul
When you copy paste the Makefile from post 7, make sure you delete the spaces shown in RED below by Backspace key and then press TAB
Code:
obj-m += hello.o
all:
........make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
........make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
how to write a device driver for USB
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Mar 3, 2010
If I were asked to write a linux device driver for a pen, How should I start???
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Nov 25, 2009
i have some basic knowledge about device drivers.can any one tell how to write drivers for virtual modem, Actually my project is to implement communication between the two PCs by using two virtual modems. so for that i need to write the code for the virtual modem which it should understand all the AT commands exactly as physical modem and it should send/receive call and SMS.
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Apr 13, 2011
I need programmer a timer of 10 ms for read/write a USB device
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Nov 1, 2010
I have a write call to a ttyACM serial device that blocks after several hundreds bytes are written.I'm writing in ~25 byte chunks, so I have 5-8 successful writes, then the next write blocks forever.I can bypass the blocked call using select, but I can never call write again without closing and re-opening the port.
The serial port is opened correctly because I can read from it just fine. Write permissions are correct, and it's opened RW.The code is likely correct because I tested the same code using the same device on a pure RS-232 serial port, and it worked fine - no block. Is there anything to know about the linux ACM module?It's my understanding that write calls basically shouldn't block.They're supposed to return -1 if there's an error.
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Jul 4, 2010
I'm writing a C program that reads the boot sector of a USB disk. (it is mounted as /dev/sda1). I'm able to read the sector, by the calls code...
The problem is when I wish to write. I use the call:
bytesWrite = write(fd, buf, 512)
The 'write' returns the value of 512, which looks as if the write was successful, yet
when I read again the /dev/sda1 device, I see that no writing was actually made.
Can anybody tell me what do I need to do in order to allow an actual write to the
device?
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Dec 1, 2010
I am final year MCA student. I like to do my project in Linux. I know a little in C. I am pursuing RHCE certification. I am using rhel5. I am interested to write linux device drivers and willing to do my project in that.
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Jul 16, 2010
I want to learn to write an USB driver on linux 2.6.x I tried to find some documents but i could not find documents for it . Most of it gave direct driver code as reference.
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May 30, 2010
I did searched you tube but my results were not great.I have 2 books on KernelProgramming.I feel I need if some where I can get a video tutorial which can help me to understand how to develop a Linux Device driver that will be great.I had a look at Greg Kroah Hartmans video lecture of developing patches on ......I have been reading books and a lot of stuff.So I wish if I could get a video lecture that would be better
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Nov 30, 2010
Is there an easy example of a block device driver I could follow as a guide to write my own module?
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Jan 14, 2011
How to do device driver programming in Ubuntu 10.04?
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Nov 22, 2010
I want to write a driver in c so that when i released the key some message will printed in output screen. The driver should be for arm.I have a driver which read the key when it is pressed.But i want the both (means key press and release).
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Mar 31, 2010
I've a problem with character device mounting. I've a character device module code. Here is the code
Code: /* chardev.c: Creates a read-only char device that says how many times
* you've read from the dev file
*/
#if defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
#include <linux/modversions.h>
#define MODVERSIONS
[Code]...
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Sep 23, 2010
I wrote a small hello world type of character device driver. When I type echo -n "abcdef" > /dev/bond and do a cat /dev/bond then only last "f" of above input abcdef is displayed rest nothing is displayed. I asked this question earlier and some people suggested me some modifications I have done and experimented all that but I am unable to catch the error.
Here is the code
Code:
/* Necessary includes for device drivers */
#include <linux/init.h>
//#include <linux/config.h>
#include <linux/module.h>
[Code].....
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Apr 3, 2010
i woul like to know if i could get help in writing a charater device driver for communication between two pc's in linux using RS-232 serial port.
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Feb 7, 2010
I have a user Application for transferring the data from one PC to the other PC using Ethernet Port, can we create a device driver for that ?? that means it should act like a virtual device, if we write data into /dev/some file, it should go the other PC
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Apr 27, 2011
i am trying learn to program linux kernel modules and smoothly transition in device driver programming. I have a year and a half worth of programming in C and have been using linux for years!! But my question is how do i compile a module? I got as far as coding it but am stuck as of now.
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Jul 31, 2011
I am building a midi synthesizer that I'd like to be able to control from linux. I know its a rather broad question, but, how do I go about this? At this point the hardware consists of a simple UART bridge, and I've already written a simple C++ program using termios to send the raw midi data to the device. Obviously I don't want to write a player/sequencer from scratch, so where should I start if I wanted to get this thing to work with, say, a sequencer like rosegarden? Do I write the driver for rosegarden, or hook into alsa or what?
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Sep 19, 2009
I am currently using fedora 11 kernel 2.6.29 version, i wanted to write device driver for usb to detect my own device. My project is radio with computer. My fm radio get connected to usb port so i need to write h/w interfacing program.
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Nov 10, 2010
The error "USB device 6 (vend/prod 0x603/0xf2) is not claimed by any active driver." is in dmesg every time I connect my Logitech keyboard to my system. I also tried (all with the same error):
- Memory stick
- DVD-burner
- Compaq mouse
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Jan 4, 2011
df -h [URL] I did the following command to find everything is in /usr or /var, then tracked it down to /usr/lib and /usr/share as the main offenders, but out of all the directories none are more than 1mb or so.
du -sh /* | sort -gr | head -n 5
I tried to uninstall firefox, which is what got me in this mess in the first place, the log claims it will remove ~240 mb but failes on a "E: Write error - write (28 No space left on device)" [URL] If I could juggle something onto an external hard drive so I can uninstall firefox I would be out of the wood. Failing that I believe a new install is in order.
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Jul 28, 2010
I have installed live cd on usb pendrive. Everything works great. How can I find out which device driver it is using? Where are the device driver files stored? How do you specify the device driver when mounting a device?
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May 30, 2010
Is there a way to log on which time my system writes data to a specific (mounted) device? I have to know what an how much my system writes.
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Nov 11, 2010
I recently added a SS drive and after 2 hours it went into read only and busy mode. The machine see the drive as does tools like fdisk, fsck, qtparted, kde partition manager but I can't reset the device to make it write-able Do I need to RMA the device (it's 12 hours old) or is there a method to make the device usable again?
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Jul 7, 2011
I am trying to write to a Ramdisk because I suffer from terrible IO speeds on my VPS. It uses openVZ and I run a Centos 5 distro.
So i created my ramdisk with '/bin/mount -t tmpfs -o size=1G,nr_inodes=10k,mode=0775,noatime,nodiratime tmpfs /tmp'
but whenever I try and copy files to it, it just spams me with 'no space left on device even though there is!
Here is the output of df:
/dev/simfs 157286400 6511452 150774948 5% /
none 16441412 4 16441408 1% /dev
tmpfs 5242880 1296 5241584 1% /disk/test
tmpfs 5242880 1296 5241584 1% /disk/test
[Code]....
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Mar 4, 2011
I need to change a filename but when I boot up I get the message root device is read-only. Is there a way of changing this so that I can change the filename. I have a Mac Pro running Leopard OSX. The graphics card an NVIDIA 7500GT or driver has failed. It was suggested elsewhere that I change the relevant kext files to filename.kext.old, which I did, now when I try to boot start in OSX I get a message in various languages telling me to restart. I have tried booting in safe mode and from original Installation CD. In Safe Mode I get the same multi language splash screen, from CD I still have the graphic card problem, screen freezes and artifacts appear. So I boot up straight into CLI by holding down CMD-S hoping to be able to change filenames back but it says device read-only.
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Jul 30, 2011
My wife is purchasing a netbook with no internal CD/DVD writing device, so we plan to purchase an external CD/DVD USB-2.0 read/write device. Our local PC shop has the following 3 external USB-2.0 DVD read/write devices:
(a) Samsung DVD-Burner SE-S084F/RSBS [not listed on Samsung site - too old ? ]
(b) LG DVD-Burner GE24NU21 USB2.0 [not listed on LG site - too old ? ]
(c) Super-Multi Portable DVD Rewrite (GP10 Lite USB2.0 Slimline) GP10NB20 (mentions Mac OS/X support, which is encouraging)
None of those are listed in the openSUSE HCL. Has anyone successfully used any of these with GNU/Linux (my google surfing on this revealed no GNU/Linux complaint nor any success stories) ? Or is there another such external USB-2.0 read/write DVD burner device that is recommended ?
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Jul 15, 2010
I can browse the iso image easily enough with a loopback mount, but when it comes to mounting the actual CD (which I did first), I get:
Code:
$ sudo mount -t udf,iso9660 /dev/dvd /mnt/dvd
mount: block device /dev/dvd is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/dvd,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
/var/log/messages isn't very helpful, either:
Code:
Jul 15 15:15:56 bkorb-dt kernel: attempt to access beyond end of device
Jul 15 15:15:56 bkorb-dt kernel: sr0: rw=0, want=68, limit=4
Jul 15 15:15:56 bkorb-dt kernel: isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16
$ md5sum openSUSE-11.3-DVD-x86_64.iso
adf5d2a0a03c1e3aaf102fd6a4771b87 openSUSE-11.3-DVD-x86_64.iso
I burned it with K3B and it gets the same result trying to mount it. K3B seems to know that the image is an iso9660 and is able to display the various 9660 id fields just fine. It just won't mount.
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