Rob Jansen wrote:
> this works - I thought that only worked on standard output lines - not on
> special function pins.
> Sometimes I am thinking too complex...
Well, maybe the hostmot2 manpage could use some clarification on this
issue. The distinction between "physical I/O pins on the board
connectors" and "GPIO HAL pins" is currently pretty muddled.
Each physical I/O pin has *some* representation in HAL, but the
particulars of that representation depends on what the I/O pin is used for.
If the physical I/O pin is used for general-purpose I/O (digital input
or output), then the manpage calls it a "full" gpio, and the user can do
anything that the firmware supports.
If the physical I/O pin is used by a PWM, stepgen, or encoder, then the
manpage calls it a "constrained" gpio, and the HAL representation is
quite limited: the pin has to still be usable by the higher-level
function that controls it. For example, a PWM pin cannot be set to be
an input.
> Meanwhile I also added spindle control with a PWM output. I think the docs
> are a bit outdated (or I just found the wrong ones).Some docs tell me the to
> use dac.0.value (where PWMs are used to create DACs), another one mentions
> pwmgen (but then use hm5i20 as a board type prefix whereas hostmot2 uses
> hm2_5i20 as boardname. Nothing which cannot be fixed with a bit of logical
> thinking.
It sounds like you found the wrong docs. Unfortunately, this is
currently easy to do, because there are two drivers that can be used
with the Mesa 5i20 board. The older driver is called m5i20, and it has
HAL pins with names like "m5i20.0.dac-X-value" pins. The newer driver
is called hostmot2 (and hm2_5i20), and it has HAL pins with names like
"hm2_5i20.0.pwmgen.XX".
--
Sebastian Kuzminsky
We need numbers, not adjectives. -- David MacKay
<http://www.withouthotair.com/>
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