X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/blobdiff_plain/e7c4fe7ee943f868421452be4d797c01cb0bf767..3613894c4e516d102e8d1ab3a68ca639eda36747:/src/adafruit_blinka/microcontroller/rockchip/PWMOut.py diff --git a/src/adafruit_blinka/microcontroller/rockchip/PWMOut.py b/src/adafruit_blinka/microcontroller/rockchip/PWMOut.py index abff5d1..2065dc7 100644 --- a/src/adafruit_blinka/microcontroller/rockchip/PWMOut.py +++ b/src/adafruit_blinka/microcontroller/rockchip/PWMOut.py @@ -1,3 +1,9 @@ +""" +Much code from https://github.com/vsergeev/python-periphery/blob/master/periphery/pwm.py +Copyright (c) 2015-2016 vsergeev / Ivan (Vanya) A. Sergeev +License: MIT +""" + import os from time import sleep from errno import EACCES @@ -7,12 +13,16 @@ try: except ImportError: raise RuntimeError("No PWM outputs defined for this board.") from ImportError +# pylint: disable=unnecessary-pass + class PWMError(IOError): """Base class for PWM errors.""" pass +# pylint: enable=unnecessary-pass + class PWMOut: """Pulse Width Modulation Output Class""" @@ -76,8 +86,15 @@ class PWMOut: self._pwm = pwm - self._chip_path = os.path.join(self._sysfs_path, self._chip_path.format(self._chip)) - self._channel_path = os.path.join(self._chip_path, self._channel_path.format(self._channel)) + self._chip_path = os.path.join( + self._sysfs_path, self._chip_path.format(self._chip) + ) + self._channel_path = os.path.join( + self._chip_path, self._channel_path.format(self._channel) + ) + + if variable_frequency: + print("Variable Frequency is not supported, continuing without it...") if not os.path.isdir(self._chip_path): raise LookupError("Opening PWM: PWM chip {} not found.".format(self._chip)) @@ -100,18 +117,29 @@ class PWMOut: sleep(PWMOut.PWM_STAT_DELAY) if not exported: - raise TimeoutError("Exporting PWM: waiting for \"{:s}\" timed out.".format(self._channel_path)) + raise TimeoutError( + 'Exporting PWM: waiting for "{:s}" timed out.'.format( + self._channel_path + ) + ) # Loop until 'period' is writable, This could take some time after # export as application of the udev rules after export is asynchronous. # Without this loop, the following properties may not be writable yet. for i in range(PWMOut.PWM_STAT_RETRIES): try: - with open(os.path.join(self._channel_path, "period"), "w",): + with open( + os.path.join(self._channel_path, "period"), + "w", + ): break except IOError as e: - if e.errno != EACCES or (e.errno == EACCES and i == PWMOut.PWM_STAT_RETRIES - 1): - raise PWMError(e.errno, "Opening PWM period: " + e.strerror) from IOError + if e.errno != EACCES or ( + e.errno == EACCES and i == PWMOut.PWM_STAT_RETRIES - 1 + ): + raise PWMError( + e.errno, "Opening PWM period: " + e.strerror + ) from IOError sleep(PWMOut.PWM_STAT_DELAY) @@ -126,7 +154,9 @@ class PWMOut: if self._channel is not None: # Unexporting the PWM channel try: - unexport_fd = os.open(os.path.join(self._chip_path, self._unexport), os.O_WRONLY) + unexport_fd = os.open( + os.path.join(self._chip_path, self._unexport), os.O_WRONLY + ) os.write(unexport_fd, "{:d}\n".format(self._channel).encode()) os.close(unexport_fd) except OSError as e: @@ -136,21 +166,21 @@ class PWMOut: self._channel = None def _write_channel_attr(self, attr, value): - with open(os.path.join(self._channel_path, attr), 'w') as f_attr: + with open(os.path.join(self._channel_path, attr), "w") as f_attr: f_attr.write(value + "\n") def _read_channel_attr(self, attr): - with open(os.path.join(self._channel_path, attr), 'r') as f_attr: + with open(os.path.join(self._channel_path, attr), "r") as f_attr: return f_attr.read().strip() # Methods def enable(self): - """Enable the PWM outout.""" + """Enable the PWM output.""" self.enabled = True def disable(self): - """Diable the PWM output.""" + """Disable the PWM output.""" self.enabled = False # Mutable properties @@ -216,7 +246,9 @@ class PWMOut: try: period_ns = int(period_ns) except ValueError: - raise PWMError(None, "Unknown period value: \"%s\"." % period_ns) from ValueError + raise PWMError( + None, 'Unknown period value: "%s".' % period_ns + ) from ValueError self._period_ns = period_ns @@ -247,7 +279,9 @@ class PWMOut: try: duty_cycle_ns = int(duty_cycle_ns_str) except ValueError: - raise PWMError(None, "Unknown duty cycle value: \"{:s}\"".format(duty_cycle_ns_str)) + raise PWMError( + None, 'Unknown duty cycle value: "{:s}"'.format(duty_cycle_ns_str) + ) return duty_cycle_ns @@ -312,7 +346,7 @@ class PWMOut: if not isinstance(polarity, str): raise TypeError("Invalid polarity type, should be str.") elif polarity.lower() not in ["normal", "inversed"]: - raise ValueError("Invalid polarity, can be: \"normal\" or \"inversed\".") + raise ValueError('Invalid polarity, can be: "normal" or "inversed".') self._write_channel_attr("polarity", polarity.lower()) @@ -333,7 +367,7 @@ class PWMOut: elif enabled == "0": return False - raise PWMError(None, "Unknown enabled value: \"{:s}\"".format(enabled)) + raise PWMError(None, 'Unknown enabled value: "{:s}"'.format(enabled)) def _set_enabled(self, value): if not isinstance(value, bool): @@ -352,5 +386,11 @@ class PWMOut: # String representation def __str__(self): - return "PWM {:d}, chip {:d} (period={:f} sec, duty_cycle={:f}%, polarity={:s}, enabled={:s})" \ - .format(self._channel, self._chip, self.period, self.duty_cycle * 100, self.polarity, str(self.enabled)) \ No newline at end of file + return "PWM {:d}, chip {:d} (period={:f} sec, duty_cycle={:f}%, polarity={:s}, enabled={:s})".format( + self._channel, + self._chip, + self.period, + self.duty_cycle * 100, + self.polarity, + str(self.enabled), + )