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pwm_tool: Add support for high-speed PWM pin updates

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The output_pin module is only capable of updating an output pin at
most once every 100ms.  Add a new pwm_tool module that is capable of
queuing updates in the micro-controller and thus allowing for much
higher update rates.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2023-10-13 21:10:11 -04:00
parent 48a05eaa54
commit 29b7550ce5
8 changed files with 201 additions and 17 deletions
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10
docs/Using_PWM_Tools.md
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@@ -1,7 +1,7 @@
# Using PWM tools
This document describes how to setup a PWM-controlled laser or spindle
using `output_pin` and some macros.
using `pwm_tool` and some macros.
## How does it work?
@@ -26,14 +26,6 @@ so that when your host or MCU encounters an error, the tool will stop.
For an example configuration, see [config/sample-pwm-tool.cfg](/config/sample-pwm-tool.cfg).
## Current Limitations
There is a limitation of how frequent PWM updates may occur.
While being very precise, a PWM update may only occur every 0.1 seconds,
rendering it almost useless for raster engraving.
However, there exists an [experimental branch](https://github.com/Cirromulus/klipper/tree/laser_tool) with its own tradeoffs.
In long term, it is planned to add this functionality to main-line klipper.
## Commands
`M3/M4 S<value>` : Set PWM duty-cycle. Values between 0 and 255.