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KevinOConnor 2023-10-23 00:04:07 +00:00
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dtoverlay=pwm,pin=12,func=4
</code></pre></div>
<p>Ez a példa csak a PWM0-t engedélyezi, és a GPIO12-re irányítja. Ha mindkét PWM csatornát engedélyezni kell, használhatod a <code>pwm-2chan</code> parancsot.</p>
<p>Az átfedés nem teszi ki a PWM sort a sysfs-en a rendszerindításkor, és azt a PWM csatorna számát a <code>/sys/class/pwm/pwmchip0/export</code> echo'ing-be kell exportálni:</p>
<div class="highlight"><pre><span></span><code>echo 0 &gt; /sys/class/pwm/pwmchip0/export
<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>
<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 example additionally 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>
<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>Ez létrehozza a <code>/sys/class/pwm/pwmchip0/pwm0</code> eszközt a fájlrendszerben. A legegyszerűbb, ha ezt a <code>/etc/rc.local</code> sor előtt az <code>exit 0</code> sorba írjuk be.</p>
<p>Ha a sysfs a helyén van, akkor most már használhatod a PWM csatornát vagy csatornákat, ha a következő konfigurációt hozzáadod a <code>printer.cfg</code> fájlhoz:</p>
<div class="highlight"><pre><span></span><code>[output_pin caselight]
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>Ez hozzáadja a hardveres PWM vezérlést a Pi GPIO12-höz (mivel az átfedés úgy volt konfigurálva, hogy a PWM0-t a pin=12-re irányítsa).</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>A PWM0 a GPIO12 és a GPIO18 a PWM1 a GPIO13 és a GPIO19 felé irányítható:</p>
<table>
<thead>