On 02/13/2014 02:19 AM, Bill Metzenthen wrote:
On 13/02/14 07:26, Drasko DRASKOVIC wrote:
Let's say that we want to bitbang Linux serial console at 1200bps.
Then it would make bit high period of ~833us. 5% of tolerated error is
~40us, and according to these benchmarks
http://www.denx.de/wiki/DUL
On 02/14/2014 07:03 AM, Adam Vaughan wrote:
>> if you want to avoid wasting cycles saving and
>> restoring context, and only use the banked register available in FIQ
>> mode, you have to use assembly, simply because gcc simply does not know
>> the registers it can not use when in FIQ mode.
>
>
> if you want to avoid wasting cycles saving and
> restoring context, and only use the banked register available in FIQ
> mode, you have to use assembly, simply because gcc simply does not know
> the registers it can not use when in FIQ mode.
Yes, that's completely correct. You're basically t
On 02/13/2014 02:14 AM, Adam Vaughan wrote:
>> There is no point, an FIQ can preempt anything, and because of this, can
>> not use any Linux, Xenomai, or Adeos service. FIQ handlers are written
>> in assembly.
>
> An FIQ doesn't have to be written in assembly, but if you're looking
> for precise c
On 02/12/2014 11:46 PM, Drasko DRASKOVIC wrote:
> Hi Charles,
>
> On Wed, Feb 12, 2014 at 11:36 PM, Charles Steinkuehler
> wrote:
>> There are also lots of ways to turn other hardware (timer/capture pins,
>> SPI ports, PWM channels) into UARTs, but you don't mention exactly what
>> chip you're us
On 13/02/14 09:46, Drasko DRASKOVIC wrote:
The module I use is Carambola2: http://8devices.com/carambola-2. It
has AR9331 Atheros chip with MIPS24Kc core.
There is one USB that can be used for COM purposes, but I have to keep
it for other peripheral.
Why not plug in a USB Hub when you want to
On 13/02/14 07:26, Drasko DRASKOVIC wrote:
Let's say that we want to bitbang Linux serial console at 1200bps.
Then it would make bit high period of ~833us. 5% of tolerated error is
~40us, and according to these benchmarks
http://www.denx.de/wiki/DULG/AN2008_03_Xenomai_gpioirqbench a machinle
like
> There is no point, an FIQ can preempt anything, and because of this, can
> not use any Linux, Xenomai, or Adeos service. FIQ handlers are written
> in assembly.
An FIQ doesn't have to be written in assembly, but if you're looking
for precise control over what the processor is doing, you probably
Hi Charles,
On Wed, Feb 12, 2014 at 11:36 PM, Charles Steinkuehler
wrote:
> There are also lots of ways to turn other hardware (timer/capture pins,
> SPI ports, PWM channels) into UARTs, but you don't mention exactly what
> chip you're using so I can't make any specific suggestions.
Thanks for
On 02/12/2014 11:39 PM, Drasko DRASKOVIC wrote:
> On Wed, Feb 12, 2014 at 10:45 PM, Gilles Chanteperdrix
> wrote:
>> On 02/12/2014 09:26 PM, Drasko DRASKOVIC wrote:
>>> Hi Gilles, Lennart,
>>>
>>> On Wed, Feb 12, 2014 at 6:36 PM, Lennart Sorensen
>>> wrote:
On Wed, Feb 12, 2014 at 12:18:13PM
On Wed, Feb 12, 2014 at 10:45 PM, Gilles Chanteperdrix
wrote:
> On 02/12/2014 09:26 PM, Drasko DRASKOVIC wrote:
>> Hi Gilles, Lennart,
>>
>> On Wed, Feb 12, 2014 at 6:36 PM, Lennart Sorensen
>> wrote:
>>> On Wed, Feb 12, 2014 at 12:18:13PM +0100, Gilles Chanteperdrix wrote:
On 02/12/2014 11:
On 2/12/2014 3:45 PM, Gilles Chanteperdrix wrote:
> On 02/12/2014 09:26 PM, Drasko DRASKOVIC wrote:
>> Hi Gilles, Lennart,
>>
>> I am asking all this because I have only one UART on my
>> microprocessor, and I have to connect one peripheral which demands
>> serial communication. And I do not want t
On 02/12/2014 09:26 PM, Drasko DRASKOVIC wrote:
> Hi Gilles, Lennart,
>
> On Wed, Feb 12, 2014 at 6:36 PM, Lennart Sorensen
> wrote:
>> On Wed, Feb 12, 2014 at 12:18:13PM +0100, Gilles Chanteperdrix wrote:
>>> On 02/12/2014 11:42 AM, Drasko DRASKOVIC wrote:
Hi all,
I was wondering can U
On Wed, Feb 12, 2014 at 09:26:58PM +0100, Drasko DRASKOVIC wrote:
> Yes, interesting... I did not know about this. There is some more info
> over there:
> http://electronics.stackexchange.com/questions/5850/how-critical-are-uart-frequencies.
>
> Let's say that we want to bitbang Linux serial cons
Hi Gilles, Lennart,
On Wed, Feb 12, 2014 at 6:36 PM, Lennart Sorensen
wrote:
> On Wed, Feb 12, 2014 at 12:18:13PM +0100, Gilles Chanteperdrix wrote:
>> On 02/12/2014 11:42 AM, Drasko DRASKOVIC wrote:
>> >Hi all,
>> >I was wondering can UART be simulated with GPIO bitbang on Linux
>> >kernel with
On Wed, Feb 12, 2014 at 12:18:13PM +0100, Gilles Chanteperdrix wrote:
> On 02/12/2014 11:42 AM, Drasko DRASKOVIC wrote:
> >Hi all,
> >I was wondering can UART be simulated with GPIO bitbang on Linux
> >kernel with Xenomai, and what bitrates (frequencies) can be expected?
>
> That probably depends
On 02/12/2014 12:36 PM, Drasko DRASKOVIC wrote:
On Wed, Feb 12, 2014 at 12:18 PM, Gilles Chanteperdrix
wrote:
On 02/12/2014 11:42 AM, Drasko DRASKOVIC wrote:
Hi all,
I was wondering can UART be simulated with GPIO bitbang on Linux
kernel with Xenomai, and what bitrates (frequencies) can be ex
On Wed, Feb 12, 2014 at 12:18 PM, Gilles Chanteperdrix
wrote:
> On 02/12/2014 11:42 AM, Drasko DRASKOVIC wrote:
>>
>> Hi all,
>> I was wondering can UART be simulated with GPIO bitbang on Linux
>> kernel with Xenomai, and what bitrates (frequencies) can be expected?
>
>
> That probably depends a l
On 02/12/2014 11:42 AM, Drasko DRASKOVIC wrote:
Hi all,
I was wondering can UART be simulated with GPIO bitbang on Linux
kernel with Xenomai, and what bitrates (frequencies) can be expected?
That probably depends a lot on the (irq) latencies you get with the
platform you target. At 115200 baud
Hi all,
I was wondering can UART be simulated with GPIO bitbang on Linux
kernel with Xenomai, and what bitrates (frequencies) can be expected?
Best regards,
Drasko
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