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# SPDX-FileCopyrightText: 2018 Dan Halbert for Adafruit Industries
#
# SPDX-License-Identifier: MIT
"""
`adafruit_hid.consumer_control.ConsumerControl`
====================================================
* Author(s): Dan Halbert
"""
import sys
if sys.implementation.version[0] < 3:
raise ImportError(
"{0} is not supported in CircuitPython 2.x or lower".format(__name__)
)
# pylint: disable=wrong-import-position
import struct
import time
from . import find_device
try:
from typing import Sequence
import usb_hid
except ImportError:
pass
class ConsumerControl:
"""Send ConsumerControl code reports, used by multimedia keyboards, remote controls, etc."""
def __init__(self, devices: Sequence[usb_hid.Device]) -> None:
"""Create a ConsumerControl object that will send Consumer Control Device HID reports.
Devices can be a sequence of devices that includes a Consumer Control device or a CC device
itself. A device is any object that implements ``send_report()``, ``usage_page`` and
``usage``.
"""
self._consumer_device = find_device(devices, usage_page=0x0C, usage=0x01)
# Reuse this bytearray to send consumer reports.
self._report = bytearray(2)
# Do a no-op to test if HID device is ready.
# If not, wait a bit and try once more.
try:
self.send(0x0)
except OSError:
time.sleep(1)
self.send(0x0)
def send(self, consumer_code: int) -> None:
"""Send a report to do the specified consumer control action,
and then stop the action (so it will not repeat).
:param consumer_code: a 16-bit consumer control code.
Examples::
from adafruit_hid.consumer_control_code import ConsumerControlCode
# Raise volume.
consumer_control.send(ConsumerControlCode.VOLUME_INCREMENT)
# Advance to next track (song).
consumer_control.send(ConsumerControlCode.SCAN_NEXT_TRACK)
"""
self.press(consumer_code)
self.release()
def press(self, consumer_code: int) -> None:
"""Send a report to indicate that the given key has been pressed.
Only one consumer control action can be pressed at a time, so any one
that was previously pressed will be released.
:param consumer_code: a 16-bit consumer control code.
Examples::
from adafruit_hid.consumer_control_code import ConsumerControlCode
# Raise volume for 0.5 seconds
consumer_control.press(ConsumerControlCode.VOLUME_INCREMENT)
time.sleep(0.5)
consumer_control.release()
"""
struct.pack_into("<H", self._report, 0, consumer_code)
self._consumer_device.send_report(self._report)
def release(self) -> None:
"""Send a report indicating that the consumer control key has been
released. Only one consumer control key can be pressed at a time.
Examples::
from adafruit_hid.consumer_control_code import ConsumerControlCode
# Raise volume for 0.5 seconds
consumer_control.press(ConsumerControlCode.VOLUME_INCREMENT)
time.sleep(0.5)
consumer_control.release()
"""
self._report[0] = self._report[1] = 0x0
self._consumer_device.send_report(self._report)
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