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en:c1_hardware_pwm [2015/02/22 12:58]
odroid [duty0]
en:c1_hardware_pwm [2015/02/22 12:59]
odroid [duty0]
Line 1: Line 1:
 +====== Hardware PWM ======
 +----
  
 +**ODROID-C1** Has two possible PWM ports. One port is shared with SPI.
 +
 +Starting from [[C1_Ubuntu_release_note_v1.1|Ubuntu Release (v1.1)]] or a kernel update performed on 2015-01-01 or later includes the PWM support.
 +
 +
 +===== Usage =====
 +For pin position, numbers and names, please refer to the pinmap [[http://​odroid.com/​dokuwiki/​doku.php?​id=en:​c1_hardware#​expansion_connectors|Expansion Connector]]
 +=== Option 1: Single PWM and SPI ===
 +The code below loads the PWM module with a single PWM and the PWM controller module.
 +
 +//**PWN PIN: 33**//
 +
 +<​code>​
 +sudo modprobe pwm-meson npwm=1
 +sudo modprobe pwm-ctrl
 +</​code>​
 +
 +
 +=== Option 2: Two PWM and **NO-SPI** ===
 +//**PWM PINS:**//
 +
 +//**PWM0: 33**//
 +
 +//**PWM1: 19**//
 +
 +<​code>​
 +sudo modprobe pwm-meson npwm=2
 +sudo modprobe pwm-ctrl
 +</​code>​
 +
 +
 +==== Examples of usage ====
 +You can control this pwm via simple sysfs entries.
 +
 +On **/​sys/​devices/​platform/​pwm-ctrl** You'll find the following files:
 +
 +==== duty0 ====
 +Duty cycle of 1023 (10bit resolution) ​ <​code>​echo 102 > duty0</​code>​ will result in 102/1023 (approx 10%) of Duty cycle.\\ \\
 +<​code>​echo 512 > duty0</​code>​ will result 50:50 of Duty cycle.
 +
 +==== enable0 ====
 +Enable/​Disable this PWM <​code>​echo 1 > enable0</​code>​ Will enable this PWM <​code>​echo 0 > enable0</​code>​ Will disable this PWM.
 +
 +==== freq0 ====
 +This is the PWM Frequency in Hertz! <​code>​echo 100000 > freq0</​code>​ This will set the frequency to 100kHz
 +
 +**Maximum Frequency is 1Mhz.**
 +
 +On PWM0 you can test higher frequencies. There are not guarantee'​s!
 +1Mhz is what we support. ​
 +
 +
 +<WRAP left round important 100%>
 +If you are using TWO pwm setup, You have:
 +enable0, freq0, duty0 __AND__
 +enable1, freq1, duty1
 +</​WRAP>​
en/c1_hardware_pwm.txt ยท Last modified: 2016/05/03 15:47 by ck.kim
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