moved a bunch of garbage (things that have nothing to do in root) to _trash
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# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""AM335x pin names"""
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try:
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from Adafruit_BBIO import GPIO
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except ImportError as error:
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raise RuntimeError(
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"The library 'Adafruit_BBIO' was not found. To install, try typing: "
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"pip install Adafruit_BBIO"
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) from error
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class Pin:
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"""Pins dont exist in CPython so...lets make our own!"""
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IN = 0
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OUT = 1
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LOW = 0
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HIGH = 1
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PULL_NONE = 0
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PULL_UP = 1
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PULL_DOWN = 2
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id = None
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_value = LOW
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_mode = IN
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def __init__(self, pin_name):
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self.id = pin_name
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def __repr__(self):
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return str(self.id)
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def __eq__(self, other):
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return self.id == other
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def init(self, mode=IN, pull=None):
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"""Initialize the Pin"""
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if mode is not None:
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if mode == self.IN:
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self._mode = self.IN
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GPIO.setup(self.id, GPIO.IN)
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elif mode == self.OUT:
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self._mode = self.OUT
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GPIO.setup(self.id, GPIO.OUT)
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else:
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raise RuntimeError("Invalid mode for pin: %s" % self.id)
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if pull is not None:
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if self._mode != self.IN:
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raise RuntimeError("Cannot set pull resistor on output")
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if pull == self.PULL_UP:
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GPIO.setup(self.id, GPIO.IN, pull_up_down=GPIO.PUD_UP)
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elif pull == self.PULL_DOWN:
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GPIO.setup(self.id, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
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else:
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raise RuntimeError("Invalid pull for pin: %s" % self.id)
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def value(self, val=None):
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"""Set or return the Pin Value"""
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if val is not None:
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if val == self.LOW:
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self._value = val
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GPIO.output(self.id, val)
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elif val == self.HIGH:
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self._value = val
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GPIO.output(self.id, val)
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else:
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raise RuntimeError("Invalid value for pin")
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return None
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return GPIO.input(self.id)
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# names in comments copied from
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# https://github.com/adafruit/adafruit-beaglebone-io-python/blob/master/source/common.c#L73
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# PocketBeagle
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# P1_1 = SYS VIN # VIN_AC
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P1_2 = Pin("P1_2") # GPIO2_23 - GPIO_87
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P1_3 = Pin("P1_3") # USB1_VBUS_OUT - (silkscreen: USB1 V_EN)
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P1_4 = Pin("P1_4") # GPIO2_25 - GPIO_89
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# P1_5 = USB VBUS # USB1_VBUS_IN
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P1_6 = Pin("P1_6") # SPI0_CS0 - GPIO_5
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# P1_7 = USB VIN # VIN-USB
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P1_8 = Pin("P1_8") # SPI0_SCLK - GPIO_2
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# P1_9 = USB1 DN # USB1-DN
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P1_10 = Pin("P1_10") # SPI0_D0 - GPIO_3
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# P1_11 = USB1 DP # USB1-DP
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P1_12 = Pin("P1_12") # SPI0_D1 - GPIO_4
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# P1_13 = USB1 ID # USB1-ID
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# P1_14 = SYS 3.3V # VOUT-3.3V
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# P1_15 = SYS GND # GND
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# P1_16 = SYS GND # GND
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# P1_17 = AIN 1.8V REF- # VREFN
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# P1_18 = AIN 1.8V REF+ # VREFP
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P1_19 = Pin("P1_19") # AIN0
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P1_20 = Pin("P1_20") # GPIO0_20 - GPIO_20
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P1_21 = Pin("P1_21") # AIN1
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# P1_22 = SYS GND # GND
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P1_23 = Pin("P1_23") # AIN2
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# P1_22 = SYS VOUT # VOUT-5V
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P1_25 = Pin("P1_25") # AIN3
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P1_26 = Pin("P1_26") # I2C2_SDA - GPIO_12
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P1_27 = Pin("P1_27") # AIN4
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P1_28 = Pin("P1_28") # I2C2_SCL - GPIO_13
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P1_29 = Pin("P1_29") # GPIO3_21 - GPIO_117
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P1_30 = Pin("P1_30") # UART0_TXD - GPIO_43
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P1_31 = Pin("P1_31") # GPIO3_18 - GPIO_114
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P1_32 = Pin("P1_32") # UART0_RXD - GPIO_42
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P1_33 = Pin("P1_33") # GPIO3_15 - GPIO_111
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P1_34 = Pin("P1_34") # GPIO0_26 - GPIO_26
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P1_35 = Pin("P1_35") # GPIO2_24 - GPIO_88
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P1_36 = Pin("P1_36") # EHRPWM0A - GPIO_110
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P2_1 = Pin("P2_1") # EHRPWM1A - GPIO_50
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P2_2 = Pin("P2_2") # GPIO1_27 - GPIO_59
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P2_3 = Pin("P2_3") # GPIO0_23 - GPIO_23
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P2_4 = Pin("P2_4") # GPIO1_26 - GPIO_58
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P2_5 = Pin("P2_5") # UART4_RXD - GPIO_30
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P2_6 = Pin("P2_6") # GPIO1_25 - GPIO_57
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P2_7 = Pin("P2_7") # UART4_TXD - GPIO_31
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P2_8 = Pin("P2_8") # GPIO1_28 - GPIO_60
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P2_9 = Pin("P2_9") # I2C1_SCL - GPIO_15
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P2_10 = Pin("P2_10") # GPIO1_20 - GPIO_52
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P2_11 = Pin("P2_11") # I2C1_SDA - GPIO_14
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# P2_12 = SYS PWR BTN # POWER_BUTTON
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# P2_13 = SYS VOUT # VOUT-5V
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# P2_14 = BAT VIN # BAT-VIN
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# P2_15 = SYS GND # GND
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# P2_16 = BAT TEMP # BAT-TEMP
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P2_17 = Pin("P2_17") # GPIO2_1 - GPIO_65
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P2_18 = Pin("P2_18") # GPIO1_15 - GPIO_47
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P2_19 = Pin("P2_19") # GPIO0_27 - GPIO_27
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P2_20 = Pin("P2_20") # GPIO2_0 - GPIO_64
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# P2_21 = SYS GND # GND
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P2_22 = Pin("P2_22") # GPIO1_14 - GPIO_46
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# P2_23 = SYS 3.3V # VOUT-3.3V
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P2_24 = Pin("P2_24") # GPIO1_12 - GPIO_44
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P2_25 = Pin("P2_25") # SPI1_D1 - GPIO_41
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# P2_26 = SYS NRST # RESET#
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P2_27 = Pin("P2_27") # SPI1_D0 - GPIO_40
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P2_28 = Pin("P2_28") # GPIO3_20 - GPIO_116
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P2_29 = Pin("P2_29") # SPI1_SCLK - GPIO_7
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P2_30 = Pin("P2_30") # GPIO3_17 - GPIO_113
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P2_31 = Pin("P2_31") # SPI1_CS1 - GPIO_19
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P2_32 = Pin("P2_32") # GPIO3_16 - GPIO_112
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P2_33 = Pin("P2_33") # GPIO1_13 - GPIO_45
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P2_34 = Pin("P2_34") # GPIO3_19 - GPIO_115
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P2_35 = Pin("P2_35") # GPIO2_22 - GPIO_86
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P2_36 = Pin("P2_36") # AIN7
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# BeagleBone Black
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# P8_1 = DGND # DGND - GPIO_0
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# P8_2 = DGND # DGND - GPIO_0
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P8_3 = Pin("P8_3") # GPIO1_6 - GPIO_38
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P8_4 = Pin("P8_4") # GPIO1_7 - GPIO_39
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P8_5 = Pin("P8_5") # GPIO1_2 - GPIO_34
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P8_6 = Pin("P8_6") # GPIO1_3 - GPIO_35
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P8_7 = Pin("P8_7") # TIMER4 - GPIO_66
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P8_8 = Pin("P8_8") # TIMER7 - GPIO_67
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P8_9 = Pin("P8_9") # TIMER5 - GPIO_69
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P8_10 = Pin("P8_10") # TIMER6 - GPIO_68
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P8_11 = Pin("P8_11") # GPIO1_13 - GPIO_45
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P8_12 = Pin("P8_12") # GPIO1_12 - GPIO_44
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P8_13 = Pin("P8_13") # EHRPWM2B - GPIO_23
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P8_14 = Pin("P8_14") # GPIO0_26 - GPIO_26
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P8_15 = Pin("P8_15") # GPIO1_15 - GPIO_47
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P8_16 = Pin("P8_16") # GPIO1_14 - GPIO_46
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P8_17 = Pin("P8_17") # GPIO0_27 - GPIO_27
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P8_18 = Pin("P8_18") # GPIO2_1 - GPIO_65
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P8_19 = Pin("P8_19") # EHRPWM2A - GPIO_22
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P8_20 = Pin("P8_20") # GPIO1_31 - GPIO_63
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P8_21 = Pin("P8_21") # GPIO1_30 - GPIO_62
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P8_22 = Pin("P8_22") # GPIO1_5 - GPIO_37
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P8_23 = Pin("P8_23") # GPIO1_4 - GPIO_36
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P8_24 = Pin("P8_24") # GPIO1_1 - GPIO_33
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P8_25 = Pin("P8_25") # GPIO1_0 - GPIO_32
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P8_26 = Pin("P8_26") # GPIO1_29 - GPIO_61
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P8_27 = Pin("P8_27") # GPIO2_22 - GPIO_86
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P8_28 = Pin("P8_28") # GPIO2_24 - GPIO_88
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P8_29 = Pin("P8_29") # GPIO2_23 - GPIO_87
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P8_30 = Pin("P8_30") # GPIO2_25 - GPIO_89
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P8_31 = Pin("P8_31") # UART5_CTSN - GPIO_10
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P8_32 = Pin("P8_32") # UART5_RTSN - GPIO_11
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P8_33 = Pin("P8_33") # UART4_RTSN - GPIO_9
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P8_34 = Pin("P8_34") # UART3_RTSN - GPIO_81
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P8_35 = Pin("P8_35") # UART4_CTSN - GPIO_8
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P8_36 = Pin("P8_36") # UART3_CTSN - GPIO_80
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P8_37 = Pin("P8_37") # UART5_TXD - GPIO_78
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P8_38 = Pin("P8_38") # UART5_RXD - GPIO_79
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P8_39 = Pin("P8_39") # GPIO2_12 - GPIO_76
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P8_40 = Pin("P8_40") # GPIO2_13 - GPIO_77
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P8_41 = Pin("P8_41") # GPIO2_10 - GPIO_74
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P8_42 = Pin("P8_42") # GPIO2_11 - GPIO_75
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P8_43 = Pin("P8_43") # GPIO2_8 - GPIO_72
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P8_44 = Pin("P8_44") # GPIO2_9 - GPIO_73
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P8_45 = Pin("P8_45") # GPIO2_6 - GPIO_70
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P8_46 = Pin("P8_46") # GPIO2_7 - GPIO_71
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# P9_1 = DGND # DGND - GPIO_0
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# P9_2 = DGND # DGND - GPIO_0
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# P9_3 = VDD_3V3 # VDD_3V3 - GPIO_0
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# P9_4 = VDD_3V3 # VDD_3V3 - GPIO_0
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# P9_5 = VDD_5V # VDD_5V - GPIO_0
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# P9_6 = VDD_5V # VDD_5V - GPIO_0
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# P9_7 = SYS_5V # SYS_5V - GPIO_0
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# P9_8 = SYS_5V # SYS_5V - GPIO_0
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# P9_9 = PWR_BUT # PWR_BUT - GPIO_0
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# P9_10 = SYS_RESETN # SYS_RESETn - GPIO_0
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P9_11 = Pin("P9_11") # UART4_RXD - GPIO_30
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P9_12 = Pin("P9_12") # GPIO1_28 - GPIO_60
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P9_13 = Pin("P9_13") # UART4_TXD - GPIO_31
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P9_14 = Pin("P9_14") # EHRPWM1A - GPIO_50
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P9_15 = Pin("P9_15") # GPIO1_16 - GPIO_48
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P9_16 = Pin("P9_16") # EHRPWM1B - GPIO_51
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P9_17 = Pin("P9_17") # I2C1_SCL - GPIO_5
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P9_18 = Pin("P9_18") # I2C1_SDA - GPIO_4
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P9_19 = Pin("P9_19") # I2C2_SCL - GPIO_13
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P9_20 = Pin("P9_20") # I2C2_SDA - GPIO_12
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P9_21 = Pin("P9_21") # UART2_TXD - GPIO_3
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P9_22 = Pin("P9_22") # UART2_RXD - GPIO_2
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P9_23 = Pin("P9_23") # GPIO1_17 - GPIO_49
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P9_24 = Pin("P9_24") # UART1_TXD - GPIO_15
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P9_25 = Pin("P9_25") # GPIO3_21 - GPIO_117
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P9_26 = Pin("P9_26") # UART1_RXD - GPIO_14
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P9_27 = Pin("P9_27") # GPIO3_19 - GPIO_115
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P9_28 = Pin("P9_28") # SPI1_CS0 - GPIO_113
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P9_29 = Pin("P9_29") # SPI1_D0 - GPIO_111
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P9_30 = Pin("P9_30") # SPI1_D1 - GPIO_112
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P9_31 = Pin("P9_31") # SPI1_SCLK - GPIO_110
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# P9_32 = VDD_ADC # VDD_ADC - GPIO_0
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# P9_33 = AIN4 # AIN4 - GPIO_0
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# P9_34 = GNDA_ADC # GNDA_ADC - GPIO_0
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# P9_35 = AIN6 # AIN6 - GPIO_0
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# P9_36 = AIN5 # AIN5 - GPIO_0
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# P9_37 = AIN2 # AIN2 - GPIO_0
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# P9_38 = AIN3 # AIN3 - GPIO_0
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# P9_39 = AIN0 # AIN0 - GPIO_0
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# P9_40 = AIN1 # AIN1 - GPIO_0
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P9_41 = Pin("P9_41") # CLKOUT2 - GPIO_20
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P9_42 = Pin("P9_42") # GPIO0_7 - GPIO_7
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# P9_43 = DGND # DGND - GPIO_0
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# P9_44 = DGND # DGND - GPIO_0
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# P9_45 = DGND # DGND - GPIO_0
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# P9_46 = DGND # DGND - GPIO_0
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##########################################
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# common to all beagles
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USR0 = Pin("USR0") # USR0 - GPIO_53
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USR1 = Pin("USR1") # USR1 - GPIO_54
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USR2 = Pin("USR2") # USR2 - GPIO_55
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USR3 = Pin("USR3") # USR3 - GPIO_56
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##########################################
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# specials
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# analog input
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AIN0 = Pin("AIN0")
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AIN1 = Pin("AIN1")
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AIN2 = Pin("AIN2")
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AIN3 = Pin("AIN3")
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AIN4 = Pin("AIN4")
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AIN5 = Pin("AIN5")
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AIN6 = Pin("AIN6")
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AIN7 = Pin("AIN7")
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# PWM
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EHRPWM0A = Pin("EHRPWM0A")
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EHRPWM0B = Pin("EHRPWM0B")
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EHRPWM1A = Pin("EHRPWM1A")
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EHRPWM1B = Pin("EHRPWM1B")
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EHRPWM2A = Pin("EHRPWM2A")
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EHRPWM2B = Pin("EHRPWM2B")
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ECAPPWM0 = Pin("ECAPPWM0")
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ECAPPWM2 = Pin("ECAPPWM2")
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TIMER4 = Pin("TIMER4")
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TIMER5 = Pin("TIMER5")
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TIMER6 = Pin("TIMER6")
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TIMER7 = Pin("TIMER7")
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# I2C1
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I2C1_SDA = Pin("I2C1_SDA")
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I2C1_SCL = Pin("I2C1_SCL")
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# I2C2
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I2C2_SDA = Pin("I2C2_SDA")
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I2C2_SCL = Pin("I2C2_SCL")
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# SPI0
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SPI0_CS0 = Pin("SPI0_CS0")
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SPI0_SCLK = Pin("SPI0_SCLK")
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SPI0_D1 = Pin("SPI0_D1")
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SPI0_D0 = Pin("SPI0_D0")
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# SPI1
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SPI1_CS0 = Pin("SPI1_CS0")
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SPI1_CS1 = Pin("SPI1_CS1")
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SPI1_SCLK = Pin("SPI1_SCLK")
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SPI1_D1 = Pin("SPI1_D1")
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SPI1_D0 = Pin("SPI1_D0")
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# UART0
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UART0_TXD = Pin("UART0_TXD")
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UART0_RXD = Pin("UART0_RXD")
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# UART1
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UART1_TXD = Pin("UART1_TXD")
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UART1_RXD = Pin("UART1_RXD")
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UART1_RTSn = Pin("UART1_RTSn")
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UART1_CTSn = Pin("UART1_CTSn")
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# UART2
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UART2_TXD = Pin("UART2_TXD")
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UART2_RXD = Pin("UART2_RXD")
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# UART3
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UART3_TXD = Pin("UART3_TXD")
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UART3_RXD = Pin("UART3_RXD")
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UART3_RTSn = Pin("UART3_RTSn")
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UART3_CTSn = Pin("UART3_CTSn")
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# UART4
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UART4_TXD = Pin("UART4_TXD")
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UART4_RXD = Pin("UART4_RXD")
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UART4_RTSn = Pin("UART4_RTSn")
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UART4_CTSn = Pin("UART4_CTSn")
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|
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# UART5
|
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UART5_TXD = Pin("UART5_TXD")
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UART5_RXD = Pin("UART5_RXD")
|
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UART5_RTSn = Pin("UART5_RTSn")
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UART5_CTSn = Pin("UART5_CTSn")
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||||
|
||||
|
||||
# ordered as spiId, sckId, mosiId, misoId
|
||||
spiPorts = (
|
||||
(0, SPI0_SCLK, SPI0_D1, SPI0_D0),
|
||||
(1, SPI1_SCLK, SPI1_D1, SPI1_D0),
|
||||
)
|
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|
||||
# ordered as uartId, txId, rxId
|
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uartPorts = (
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# (0, UART0_TXD, UART0_RXD),
|
||||
# (1, UART1_TXD, UART1_RXD),
|
||||
# (2, UART2_TXD, UART2_RXD),
|
||||
# (4, UART4_TXD, UART4_RXD),
|
||||
# (5, UART5_TXD, UART5_RXD),
|
||||
)
|
||||
|
||||
# ordered as i2cId, SCL, SDA
|
||||
i2cPorts = (
|
||||
(1, I2C1_SCL, I2C1_SDA),
|
||||
(2, I2C2_SCL, I2C2_SDA),
|
||||
)
|
||||
|
||||
PWM1 = P1_36
|
||||
PWM2 = P1_33
|
||||
PWM3 = P2_1
|
||||
PWM4 = P2_3
|
||||
|
||||
pwmOuts = (((0, 0), PWM1), ((0, 1), PWM2), ((2, 0), PWM3), ((4, 1), PWM4))
|
||||
|
|
@ -0,0 +1,336 @@
|
|||
# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
|
||||
#
|
||||
# SPDX-License-Identifier: MIT
|
||||
"""
|
||||
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
|
||||
|
||||
try:
|
||||
from microcontroller.pin import pwmOuts
|
||||
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"""
|
||||
|
||||
# Sysfs paths
|
||||
_sysfs_path = "/sys/class/pwm/"
|
||||
_channel_path = "pwmchip{}"
|
||||
|
||||
# Channel paths
|
||||
_export_path = "export"
|
||||
_unexport_path = "unexport"
|
||||
_pin_path = "pwm-{}:{}"
|
||||
|
||||
# Pin attribute paths
|
||||
_pin_period_path = "period"
|
||||
_pin_duty_cycle_path = "duty_cycle"
|
||||
_pin_polarity_path = "polarity"
|
||||
_pin_enable_path = "enable"
|
||||
|
||||
def __init__(self, pin, *, frequency=500, duty_cycle=0, variable_frequency=False):
|
||||
"""Instantiate a PWM object and open the sysfs PWM corresponding to the
|
||||
specified channel and pin.
|
||||
|
||||
Args:
|
||||
pin (Pin): CircuitPython Pin object to output to
|
||||
duty_cycle (int) : The fraction of each pulse which is high. 16-bit
|
||||
frequency (int) : target frequency in Hertz (32-bit)
|
||||
variable_frequency (bool) : True if the frequency will change over time
|
||||
|
||||
Returns:
|
||||
PWMOut: PWMOut object.
|
||||
|
||||
Raises:
|
||||
PWMError: if an I/O or OS error occurs.
|
||||
TypeError: if `channel` or `pin` types are invalid.
|
||||
ValueError: if PWM channel does not exist.
|
||||
|
||||
"""
|
||||
|
||||
self._pwmpin = None
|
||||
self._channel = None
|
||||
self._period = 0
|
||||
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._channel = None
|
||||
for pwmpair in pwmOuts:
|
||||
if pwmpair[1] == pin:
|
||||
self._channel = pwmpair[0][0]
|
||||
self._pwmpin = pwmpair[0][1]
|
||||
|
||||
self._pin = pin
|
||||
if self._channel is None:
|
||||
raise RuntimeError("No PWM channel found for this Pin")
|
||||
|
||||
if variable_frequency:
|
||||
print("Variable Frequency is not supported, continuing without it...")
|
||||
|
||||
channel_path = os.path.join(
|
||||
self._sysfs_path, self._channel_path.format(self._channel)
|
||||
)
|
||||
if not os.path.isdir(channel_path):
|
||||
raise ValueError(
|
||||
"PWM channel does not exist, check that the required modules are loaded."
|
||||
)
|
||||
|
||||
pin_path = os.path.join(
|
||||
channel_path, self._pin_path.format(self._channel, self._pwmpin)
|
||||
)
|
||||
if not os.path.isdir(pin_path):
|
||||
try:
|
||||
with open(
|
||||
os.path.join(channel_path, self._export_path), "w", encoding="utf-8"
|
||||
) as f_export:
|
||||
f_export.write("%d\n" % self._pwmpin)
|
||||
except IOError as e:
|
||||
raise PWMError(e.errno, "Exporting PWM pin: " + e.strerror) from IOError
|
||||
|
||||
# Look up the period, for fast duty cycle updates
|
||||
self._period = self._get_period()
|
||||
|
||||
# set frequency
|
||||
self.frequency = freq
|
||||
# set duty
|
||||
self.duty_cycle = duty
|
||||
|
||||
self._set_enabled(True)
|
||||
|
||||
def deinit(self):
|
||||
"""Deinit the sysfs PWM."""
|
||||
# pylint: disable=broad-except
|
||||
try:
|
||||
channel_path = os.path.join(
|
||||
self._sysfs_path, self._channel_path.format(self._channel)
|
||||
)
|
||||
|
||||
if self._channel is not None:
|
||||
# self.duty_cycle = 0
|
||||
self._set_enabled(False) # make to disable before unexport
|
||||
try:
|
||||
# unexport_path = os.path.join(channel_path, self._unexport_path)
|
||||
with open(
|
||||
os.path.join(channel_path, self._unexport_path),
|
||||
"w",
|
||||
encoding="utf-8",
|
||||
) as f_unexport:
|
||||
f_unexport.write("%d\n" % self._pwmpin)
|
||||
except IOError as e:
|
||||
raise PWMError(
|
||||
e.errno, "Unexporting PWM pin: " + e.strerror
|
||||
) from IOError
|
||||
except Exception as e:
|
||||
# due to a race condition for which I have not yet been
|
||||
# able to find the root cause, deinit() often fails
|
||||
# but it does not effect future usage of the pwm pin
|
||||
print(
|
||||
"warning: failed to deinitialize pwm pin {0}:{1} due to: {2}\n".format(
|
||||
self._channel, self._pwmpin, type(e).__name__
|
||||
)
|
||||
)
|
||||
finally:
|
||||
self._channel = None
|
||||
self._pwmpin = None
|
||||
# pylint: enable=broad-except
|
||||
|
||||
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."
|
||||
)
|
||||
|
||||
def _write_pin_attr(self, attr, value):
|
||||
# Make sure the pin is active
|
||||
self._is_deinited()
|
||||
|
||||
path = os.path.join(
|
||||
self._sysfs_path,
|
||||
self._channel_path.format(self._channel),
|
||||
self._pin_path.format(self._channel, self._pwmpin),
|
||||
attr,
|
||||
)
|
||||
|
||||
with open(path, "w", encoding="utf-8") as f_attr:
|
||||
f_attr.write(value + "\n")
|
||||
|
||||
def _read_pin_attr(self, attr):
|
||||
# Make sure the pin is active
|
||||
self._is_deinited()
|
||||
|
||||
path = os.path.join(
|
||||
self._sysfs_path,
|
||||
self._channel_path.format(self._channel),
|
||||
self._pin_path.format(self._channel, self._pwmpin),
|
||||
attr,
|
||||
)
|
||||
|
||||
with open(path, "r", encoding="utf-8") as f_attr:
|
||||
return f_attr.read().strip()
|
||||
|
||||
# Mutable properties
|
||||
|
||||
def _get_period(self):
|
||||
period_ns = self._read_pin_attr(self._pin_period_path)
|
||||
try:
|
||||
period_ns = int(period_ns)
|
||||
except ValueError:
|
||||
raise PWMError(
|
||||
None, 'Unknown period value: "%s"' % period_ns
|
||||
) from ValueError
|
||||
|
||||
# Convert period from nanoseconds to seconds
|
||||
period = period_ns / 1e9
|
||||
|
||||
# Update our cached period
|
||||
self._period = period
|
||||
|
||||
return period
|
||||
|
||||
def _set_period(self, period):
|
||||
if not isinstance(period, (int, float)):
|
||||
raise TypeError("Invalid period type, should be int or float.")
|
||||
|
||||
# Convert period from seconds to integer nanoseconds
|
||||
period_ns = int(period * 1e9)
|
||||
|
||||
self._write_pin_attr(self._pin_period_path, "{}".format(period_ns))
|
||||
|
||||
# Update our cached period
|
||||
self._period = float(period)
|
||||
|
||||
period = property(_get_period, _set_period)
|
||||
|
||||
"""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
|
||||
"""
|
||||
|
||||
def _get_duty_cycle(self):
|
||||
duty_cycle_ns = self._read_pin_attr(self._pin_duty_cycle_path)
|
||||
try:
|
||||
duty_cycle_ns = int(duty_cycle_ns)
|
||||
except ValueError:
|
||||
raise PWMError(
|
||||
None, 'Unknown duty cycle value: "%s"' % duty_cycle_ns
|
||||
) from ValueError
|
||||
|
||||
# Convert duty cycle from nanoseconds to seconds
|
||||
duty_cycle = duty_cycle_ns / 1e9
|
||||
|
||||
# Convert duty cycle to ratio from 0.0 to 1.0
|
||||
duty_cycle = duty_cycle / self._period
|
||||
|
||||
# convert to 16-bit
|
||||
duty_cycle = int(duty_cycle * 65535)
|
||||
return duty_cycle
|
||||
|
||||
def _set_duty_cycle(self, duty_cycle):
|
||||
if not isinstance(duty_cycle, (int, float)):
|
||||
raise TypeError("Invalid duty cycle type, should be int or float.")
|
||||
|
||||
# convert from 16-bit
|
||||
duty_cycle /= 65535.0
|
||||
if not 0.0 <= duty_cycle <= 1.0:
|
||||
raise ValueError("Invalid duty cycle value, should be between 0.0 and 1.0.")
|
||||
|
||||
# Convert duty cycle from ratio to seconds
|
||||
duty_cycle = duty_cycle * self._period
|
||||
|
||||
# Convert duty cycle from seconds to integer nanoseconds
|
||||
duty_cycle_ns = int(duty_cycle * 1e9)
|
||||
|
||||
self._write_pin_attr(self._pin_duty_cycle_path, "{}".format(duty_cycle_ns))
|
||||
|
||||
duty_cycle = property(_get_duty_cycle, _set_duty_cycle)
|
||||
"""Get or set the PWM's output duty cycle as a ratio from 0.0 to 1.0.
|
||||
|
||||
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
|
||||
"""
|
||||
|
||||
def _get_frequency(self):
|
||||
return 1.0 / self._get_period()
|
||||
|
||||
def _set_frequency(self, frequency):
|
||||
if not isinstance(frequency, (int, float)):
|
||||
raise TypeError("Invalid frequency type, should be int or float.")
|
||||
|
||||
self._set_period(1.0 / frequency)
|
||||
|
||||
frequency = property(_get_frequency, _set_frequency)
|
||||
"""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
|
||||
"""
|
||||
|
||||
def _get_enabled(self):
|
||||
enabled = self._read_pin_attr(self._pin_enable_path)
|
||||
|
||||
if enabled == "1":
|
||||
return True
|
||||
if enabled == "0":
|
||||
return False
|
||||
|
||||
raise PWMError(None, 'Unknown enabled value: "%s"' % enabled)
|
||||
|
||||
def _set_enabled(self, value):
|
||||
"""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
|
||||
"""
|
||||
if not isinstance(value, bool):
|
||||
raise TypeError("Invalid enabled type, should be string.")
|
||||
|
||||
self._write_pin_attr(self._pin_enable_path, "1" if value else "0")
|
||||
|
||||
# String representation
|
||||
|
||||
def __str__(self):
|
||||
return "PWM%d, pin %s (freq=%f Hz, duty_cycle=%f%%)" % (
|
||||
self._channel,
|
||||
self._pin,
|
||||
self.frequency,
|
||||
self.duty_cycle * 100,
|
||||
)
|
||||
Loading…
Add table
Add a link
Reference in a new issue