X-Git-Url: https://git.ayoreis.com/hackapet/Adafruit_Blinka.git/blobdiff_plain/498d20f05e125c355acf4bfccc9e35bb7461f9d5..99ce0ad895659a2e1ba26003d4b5f78e6471f8e4:/src/adafruit_blinka/microcontroller/am65xx/pwmout.py

diff --git a/src/adafruit_blinka/microcontroller/am65xx/pwmout.py b/src/adafruit_blinka/microcontroller/am65xx/pwmout.py
new file mode 100644
index 0000000..264f16d
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+++ b/src/adafruit_blinka/microcontroller/am65xx/pwmout.py
@@ -0,0 +1,177 @@
+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: 2022 Martin Schnur for Siemens AG
+#
+# SPDX-License-Identifier: MIT
+"""Custom PWMOut Wrapper for am65xx"""
+"""
+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 mraa
+from adafruit_blinka.microcontroller.am65xx.pin import Pin
+
+
+# pylint: disable=unnecessary-pass
+class PWMError(IOError):
+    """Base class for PWM errors."""
+
+    pass
+
+
+# pylint: enable=unnecessary-pass
+
+
+class PWMOut:
+    """Pulse Width Modulation Output Class"""
+
+    def __init__(self, pin, *, frequency=500, duty_cycle=0, variable_frequency=False):
+        self._frequency = None
+        self._duty_cycle = None
+        self._pwmpin = None
+        self._period = 0
+        self._enabled = False
+        self._varfreq = variable_frequency
+        # check pin for PWM support
+        self._pin = Pin(pin.id)
+        self._pin.init(mode=Pin.PWM)
+        # initialize pin
+        self._open(pin, duty_cycle, frequency, variable_frequency)
+
+    def __del__(self):
+        self.deinit()
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, t, value, traceback):
+        self.deinit()
+
+    def _open(self, pin, duty=0, freq=500, variable_frequency=False):
+        self._pwmpin = mraa.Pwm(pin.id)
+        self.frequency = freq
+        self.enabled = True
+        self._varfreq = variable_frequency
+        self.duty_cycle = duty
+
+    def deinit(self):
+        """Deinit the PWM."""
+        if self._pwmpin is not None:
+            self._pwmpin.enable(False)
+            self._pwmpin = None
+
+    def _is_deinited(self):
+        if self._pwmpin is None:
+            raise ValueError(
+                "Object has been deinitialize and can no longer "
+                "be used. Create a new object."
+            )
+
+    @property
+    def period(self):
+        """Get or set the PWM's output period in seconds.
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not int or float.
+
+        :type: int, float
+        """
+        return 1.0 / self.frequency
+
+    @period.setter
+    def period(self, period):
+        if not isinstance(period, (int, float)):
+            raise TypeError("Invalid period type, should be int or float.")
+
+        self.frequency = 1.0 / period
+
+    @property
+    def duty_cycle(self):
+        """Get or set the PWM's output duty cycle which is the fraction of
+        each pulse which is high. 16-bit
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not int or float.
+            ValueError: if value is out of bounds of 0.0 to 1.0.
+
+        :type: int, float
+        """
+        return int(self._duty_cycle * 65535)
+
+    @duty_cycle.setter
+    def duty_cycle(self, duty_cycle):
+        if not isinstance(duty_cycle, (int, float)):
+            raise TypeError("Invalid duty cycle type, should be int or float.")
+
+        if not 0 <= duty_cycle <= 65535:
+            raise ValueError("Invalid duty cycle value, should be between 0 and 65535")
+
+        # convert from 16-bit
+        duty_cycle /= 65535.0
+
+        self._duty_cycle = duty_cycle
+        # self._pwmpin.ChangeDutyCycle(round(self._duty_cycle * 100))
+        self._pwmpin.write(self._duty_cycle)  # mraa duty_cycle 0.0f - 1.0f
+
+    @property
+    def frequency(self):
+        """Get or set the PWM's output frequency in Hertz.
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not int or float.
+
+        :type: int, float
+        """
+
+        return self._frequency
+
+    @frequency.setter
+    def frequency(self, frequency):
+        if not isinstance(frequency, (int, float)):
+            raise TypeError("Invalid frequency type, should be int or float.")
+
+        if self._enabled and not self._varfreq:
+            raise TypeError(
+                " Set variable_frequency = True to allow changing frequency "
+            )
+        # mraa has different variants in seconds,milli(_ms),micro(_us)
+        self._pwmpin.period((1 / frequency))
+        self._frequency = frequency
+
+    @property
+    def enabled(self):
+        """Get or set the PWM's output enabled state.
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not bool.
+
+        :type: bool
+        """
+        return self._enabled
+
+    @enabled.setter
+    def enabled(self, value):
+        if not isinstance(value, bool):
+            raise TypeError("Invalid enabled type, should be string.")
+
+        if value:
+            self._pwmpin.enable(True)
+            self._enabled = value
+        else:
+            self._pwmpin.enable(False)
+            self._enabled(False)
+
+    # String representation
+    def __str__(self):
+        return "pin %s (freq=%f Hz, duty_cycle=%f%%)" % (
+            self._pin,
+            self.frequency,
+            self.duty_cycle,
+        )