Re: [Xenomai-core] Analogy DIO speed

[Alexis Berlemont <berlemont.hauw@domain.hid>]

Hi Stefan,

Sorry for the late reply, I was unavailable yesterday.

Stefan Schaal wrote:
> Hi Alexis,
> 
>  we pulled your analogy branch, and now cmd_write works. Great, and thanks a lot! Next, I tried to use commands with the digital IO subdevice on our board (subdevice #2), but the get an error message:
> 
> 
> [ 2482.771913] Analogy: a4l_check_cmddesc: scan_begin_src, trigger unsupported
Unfortunately, cmd_write was not designed to work with digital
subdevices; the command's fields are not appropriate, I am trying to
make it work quite quickly.

> 
> 
> Is there just missing support for the DIO subdevices using commands?
> 
> Best wishes,
> 
> -Stefan
> 
> 
> ps.: feel free to use our machine for debugging -- it now has the latest version of your software installed with linux kernel 2.6.29.5.
> 
> 
> 
> 
> 
> On Feb 28, 2010, at 16:24, Alexis Berlemont wrote:
> 
>> Alexis Berlemont wrote:
>>> Hi,
>>> Stefan Schaal wrote:
>>>> Hi Alexis,
>>>>
>>>> On Feb 18, 2010, at 14:34, Alexis Berlemont wrote:
>>>>
>>>>> I have some problems with
>>>>>> implementing commands on my NI6259 so far.
>>>>> Could you remind me what was the problem ?
>>>> See the print-outs below for the problem we have.
>>>>
>>>> Thanks so much for looking into this!
>>>>
>>>> -Stefan
>>>>
>>>>
>>>>
>>>>
>>>> Using the cmd_write() function that you provide in analogy, we get the following problem:
>>>>
>>> I am currently trying to fix this bug, which is not that easy. I just
>>> have one question (that I remember I have already asked you in some way,
>>> but I just want to be sure):
>>> Does this bug occur the very first time you launched cmd_write (I mean
>>> after a reboot) ?
>>>
>> I managed at last to fix the bug you were facing (at least I hope so).
>> The problem was located in the trigger callback which waited for a
>> bit-status (fifo half full) before going further; however, sometimes the
>> DMA interrupt already occurred and cleaned everything behind your back.
>>
>> I have not made a pull request because the current implementation is not
>> perfect.
>>
>> If you have some time, could you clone my git repository (branch:
>> analogy) and check that a simple call to cmd_write does not trigger the
>> bug anymore ?
>>
>> Many thanks.
>>>> root@domain.hid# ./cmd_write -v
>>>> cmd_write: device analogy0 opened (fd=0)
>>>> cmd_write: basic descriptor retrieved
>>>>    subdevices count = 14
>>>>    read subdevice index = 0
>>>>    write subdevice index = 1
>>>> cmd_write: complex descriptor retrieved
>>>> cmd_write: channel 0
>>>>    ranges count = 3
>>>>    range's size = 16 (bits)
>>>> cmd_write: channel 1
>>>>    ranges count = 3
>>>>    range's size = 16 (bits)
>>>> cmd_write: scan size = 4
>>>> cmd_write: size to write  = 400
>>>> cmd_write: command successfully sent
>>>> cmd_write: triggering failed (ret=-32)
>>>>
>>>> root@domain.hid# dmesg -c
>>>> [133345.213865] Analogy: analogy_ni_pcimio: ni_mio_common: interrupt: b_status=0002 m1_status=80a80000
>>>> [133345.332719] Analogy: analogy_ni_pcimio: ni_ao_wait_for_dma_load: timed out waiting for dma load<3>Analogy: a4l_do_special_insn: execution of the instruction failed (err=-32)
>>>>
>>>>
>>>> Another problem we have is with the --mmap option:
>>>>
>>>> root@domain.hid# ./cmd_write -v --mmap
>>>> cmd_write: device analogy0 opened (fd=0)
>>>> cmd_write: basic descriptor retrieved
>>>>    subdevices count = 14
>>>>    read subdevice index = 0
>>>>    write subdevice index = 1
>>>> cmd_write: complex descriptor retrieved
>>>> cmd_write: channel 0
>>>>    ranges count = 3
>>>>    range's size = 16 (bits)
>>>> cmd_write: channel 1
>>>>    ranges count = 3
>>>>    range's size = 16 (bits)
>>>> cmd_write: scan size = 4
>>>> cmd_write: size to write  = 400
>>>> cmd_write: buffer size = 65536 bytes
>>>> cmd_write: a4l_mmap() failed (ret=-22)
>>>>
>>>>
>>>> root@domain.hid# dmesg -c
>>>> [133408.942998] Analogy: a4l_ioctl_mmap: mmap not allowed on this subdevice
>>>>
>>>>
>>> Alexis.
>> Alexis.
>>
> 
> 
Alexis.