In this scenario, the dac would be driving a bldc, so it would need to be
updated around 4-8khz.

On Thu, Oct 13, 2016 at 2:24 PM, Erik Friesen <e...@aercon.net> wrote:

> To clarify my question, I am trying to understand at what level lcnc
> accesses hardware peripherals.  For example, suppose I build a board with
> an spi dac peripheral to the arm, as well as write the kernel driver, if
> necessary.  What type of glue do I need to provide in this situation?
>
> On Thu, Oct 13, 2016 at 1:50 PM, Nicklas Karlsson <
> nicklas.karlsso...@gmail.com> wrote:
>
>> On the Cortex-M* model usually used on micro controllers there use to be
>> a reference manual. Usually there is register to configure pin
>> functionality, GPIO is a common default value and a register to select
>> direction input or output.
>>
>> There use to a library but software complexity become lower by accessing
>> the registers directly unless there is a need to change things dynamically.
>> The libraries are usually written for dynamic access while software almost
>> always only have need for simpler static access. To register callback
>> functions at an interrupt handler is a perfect example, if the same
>> function(s) is registered at every startup they could be added statically
>> and it is possible to generate a call graph.
>>
>>
>> On Thu, 13 Oct 2016 13:27:55 -0400
>> Erik Friesen <e...@aercon.net> wrote:
>>
>> > Resurrecting this thread, can anyone point me to docs, or other info
>> what
>> > it takes to link GPIO, or SPI devices into linuxcnc on an arm?  On what
>> > level does this happen?  Userspace, Kernelspace, etc?  I have done a
>> bit of
>> > kernel programming for the i.mx6.
>> >
>> > On Thu, Mar 24, 2016 at 8:19 AM, Ron Ginger <rongin...@roadrunner.com>
>> > wrote:
>> >
>> > > I was helping a commercial screw machine shop that had a couple little
>> > > KX1 mills. One was getting rather tired after 5 or 6 years of
>> production
>> > > use and having repeatability problem. I was speaking with the general
>> > > manager and asked "well how long do you expect a machine to last?" and
>> > > without a hint of a smile he whipped back "40 years"
>> > >
>> > > The KX1 was installed less then 50 feet from a row of screw machines
>> > > maybe as old as I am (73 years) and they were clanking away dropping
>> > > parts into a bin.
>> > >
>> > > ron ginger
>> > >
>> > > > Who wants to use and maintain (if it is possible) an original CNC
>> control
>> > > > made prior to 2000 ??
>> > > >
>> > > > Dave
>> > > >
>> > >
>> > >
>> > > ------------------------------------------------------------
>> > > ------------------
>> > > Transform Data into Opportunity.
>> > > Accelerate data analysis in your applications with
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