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KevinOConnor 2023-10-23 00:04:07 +00:00
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it/RPi_microcontroller.html
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Axis Twist Compensation
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@ -1561,21 +1561,40 @@ gpiochip1 - 8 lines:
dtoverlay=pwm,pin=12,func=4
</code></pre></div>
<p>Questo esempio abilita solo PWM0 e lo indirizza a gpio12. Se entrambi i canali PWM devono essere abilitati potete usare <code>pwm-2chan</code>.</p>
<p>L'overlay non espone la riga pwm sui sysfs all'avvio e deve essere esportata facendo eco al numero del canale pwm in <code>/sys/class/pwm/pwmchip0/export</code>:</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>Questo creerà il dispositivo <code>/sys/class/pwm/pwmchip0/pwm0</code> nel filesystem. Il modo più semplice per farlo è aggiungerlo a <code>/etc/rc.local</code> prima della riga <code>exit 0</code>.</p>
<p>Con il sysfs a posto, potete ora utilizzare il canale o i canali pwm aggiungendo il seguente pezzo di configurazione al vostro <code>printer.cfg</code>:</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>Questo aggiungerà il controllo pwm hardware a gpio12 sul Pi (perché l'overlay è stato configurato per instradare pwm0 a 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 può essere indirizzato su gpio12 e gpio18, PWM1 può essere indirizzato su gpio13 e gpio19:</p>
<table>
<thead>