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KevinOConnor
2023-08-13 19:24:45 +00:00
parent 25ef789799
commit 8335df53cf
14 changed files with 29 additions and 10 deletions
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RPi_microcontroller.html
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@@ -1588,16 +1588,27 @@ dtoverlay=pwm,pin=12,func=4
</code></pre></div>
<p>This example enables only PWM0 and routes it to gpio12. If both PWM
channels need to be enabled you can use <code>pwm-2chan</code>.</p>
<p>The overlay does not expose the pwm line on sysfs on boot and needs to
be exported by echo'ing the number of the pwm channel to
<code>/sys/class/pwm/pwmchip0/export</code>:</p>
<div class="highlight"><pre><span></span><code>echo 0 &gt; /sys/class/pwm/pwmchip0/export
channels need to be enabled you can use <code>pwm-2chan</code>:</p>
<div class="highlight"><pre><span></span><code># Enable pwmchip sysfs interface
dtoverlay=pwm-2chan,pin=12,func=4,pin2=13,func2=4
</code></pre></div>
<p>This will create device <code>/sys/class/pwm/pwmchip0/pwm0</code> in the
<p>This example additionaly enables PWM1 and routes it to gpio13.</p>
<p>The overlay does not expose the pwm line on sysfs on boot and needs to
be exported by echo'ing the number of the pwm channel to
<code>/sys/class/pwm/pwmchip0/export</code>. This will create device <code>/sys/class/pwm/pwmchip0/pwm0</code> in the
filesystem. The easiest way to do this is by adding this to
<code>/etc/rc.local</code> before the <code>exit 0</code> line.</p>
<code>/etc/rc.local</code> before the <code>exit 0</code> line:</p>
<div class="highlight"><pre><span></span><code># Enable pwmchip sysfs interface
echo 0 &gt; /sys/class/pwm/pwmchip0/export
</code></pre></div>
<p>When using both PWM channels, the number of the second channel needs to be echo'd as well:</p>
<div class="highlight"><pre><span></span><code># Enable pwmchip sysfs interface
echo 0 &gt; /sys/class/pwm/pwmchip0/export
echo 1 &gt; /sys/class/pwm/pwmchip0/export
</code></pre></div>
<p>With the sysfs in place, you can now use either the pwm channel(s) by
adding the following piece of configuration to your <code>printer.cfg</code>:</p>
<div class="highlight"><pre><span></span><code>[output_pin caselight]
@@ -1605,10 +1616,18 @@ pin: host:pwmchip0/pwm0
pwm: True
hardware_pwm: True
cycle_time: 0.000001
[output_pin beeper]
pin: host:pwmchip0/pwm1
pwm: True
hardware_pwm: True
value: 0
shutdown_value: 0
cycle_time: 0.0005
</code></pre></div>
<p>This will add hardware pwm control to gpio12 on the Pi (because the
overlay was configured to route pwm0 to pin=12).</p>
<p>This will add hardware pwm control to gpio12 and gpio13 on the Pi (because the
overlay was configured to route pwm0 to pin=12 and pwm1 to pin=13).</p>
<p>PWM0 can be routed to gpio12 and gpio18, PWM1 can be routed to gpio13
and gpio19:</p>
<table>