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sysfs-class-pwm

sysfs-class-pwm 2.2 KB
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  1. What:		/sys/class/pwm/
    2. 

  2. Date:		May 2013
    3. 

  3. KernelVersion:	3.11
    4. 

  4. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    5. 

  5. Description:
    6. 

  6. 		The pwm/ class sub-directory belongs to the Generic PWM
    7. 

  7. 		Framework and provides a sysfs interface for using PWM
    8. 

  8. 		channels.
    9. 

  9. 

  10. What:		/sys/class/pwm/pwmchipN/
    11. 

  11. Date:		May 2013
    12. 

  12. KernelVersion:	3.11
    13. 

  13. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    14. 

  14. Description:
    15. 

  15. 		A /sys/class/pwm/pwmchipN directory is created for each
    16. 

  16. 		probed PWM controller/chip where N is the base of the
    17. 

  17. 		PWM chip.
    18. 

  18. 

  19. What:		/sys/class/pwm/pwmchipN/npwm
    20. 

  20. Date:		May 2013
    21. 

  21. KernelVersion:	3.11
    22. 

  22. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    23. 

  23. Description:
    24. 

  24. 		The number of PWM channels supported by the PWM chip.
    25. 

  25. 

  26. What:		/sys/class/pwm/pwmchipN/export
    27. 

  27. Date:		May 2013
    28. 

  28. KernelVersion:	3.11
    29. 

  29. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    30. 

  30. Description:
    31. 

  31. 		Exports a PWM channel from the PWM chip for sysfs control.
    32. 

  32. 		Value is between 0 and /sys/class/pwm/pwmchipN/npwm - 1.
    33. 

  33. 

  34. What:		/sys/class/pwm/pwmchipN/unexport
    35. 

  35. Date:		May 2013
    36. 

  36. KernelVersion:	3.11
    37. 

  37. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    38. 

  38. Description:
    39. 

  39. 		Unexports a PWM channel.
    40. 

  40. 

  41. What:		/sys/class/pwm/pwmchipN/pwmX
    42. 

  42. Date:		May 2013
    43. 

  43. KernelVersion:	3.11
    44. 

  44. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    45. 

  45. Description:
    46. 

  46. 		A /sys/class/pwm/pwmchipN/pwmX directory is created for
    47. 

  47. 		each exported PWM channel where X is the exported PWM
    48. 

  48. 		channel number.
    49. 

  49. 

  50. What:		/sys/class/pwm/pwmchipN/pwmX/period
    51. 

  51. Date:		May 2013
    52. 

  52. KernelVersion:	3.11
    53. 

  53. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    54. 

  54. Description:
    55. 

  55. 		Sets the PWM signal period in nanoseconds.
    56. 

  56. 

  57. What:		/sys/class/pwm/pwmchipN/pwmX/duty_cycle
    58. 

  58. Date:		May 2013
    59. 

  59. KernelVersion:	3.11
    60. 

  60. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    61. 

  61. Description:
    62. 

  62. 		Sets the PWM signal duty cycle in nanoseconds.
    63. 

  63. 

  64. What:		/sys/class/pwm/pwmchipN/pwmX/polarity
    65. 

  65. Date:		May 2013
    66. 

  66. KernelVersion:	3.11
    67. 

  67. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    68. 

  68. Description:
    69. 

  69. 		Sets the output polarity of the PWM signal to "normal" or
    70. 

  70. 		"inversed".
    71. 

  71. 

  72. What:		/sys/class/pwm/pwmchipN/pwmX/enable
    73. 

  73. Date:		May 2013
    74. 

  74. KernelVersion:	3.11
    75. 

  75. Contact:	H Hartley Sweeten <hsweeten@visionengravers.com>
    76. 

  76. Description:
    77. 

  77. 		Enable/disable the PWM signal.
    78. 

  78. 		0 is disabled
    79. 

  79. 		1 is enabled
    80.