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[194.223.178.180]) by smtp.gmail.com with ESMTPSA id s13-20020a170902988d00b001b680aab2f0sm3612644plp.121.2023.06.26.01.34.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jun 2023 01:34:16 -0700 (PDT) From: Kent Gibson To: linux-gpio@vger.kernel.org, brgl@bgdev.pl Cc: Kent Gibson Subject: [libgpiod][PATCH v3] bindings: python: examples: replace tools examples with use case examples Date: Mon, 26 Jun 2023 16:34:02 +0800 Message-ID: <20230626083402.27173-1-warthog618@gmail.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Replace tool examples with use case examples drawn from the tools. Signed-off-by: Kent Gibson --- Changes v2 -> v3: - rename edge_type() to edge_type_str() - all old style prints converted to format - apply both of those to the already merged watch_line_value.py. v1 -> v2: - rename gpio_chips() - shorten reconfigure_input_to_output file comment - use format style prints bindings/python/examples/Makefile.am | 18 +++---- .../python/examples/async_watch_line_value.py | 9 ++-- bindings/python/examples/find_line_by_name.py | 37 +++++++++++++++ bindings/python/examples/get_chip_info.py | 20 ++++++++ bindings/python/examples/get_line_info.py | 29 ++++++++++++ .../examples/get_multiple_line_values.py | 29 ++++++++++++ bindings/python/examples/gpiodetect.py | 15 ------ bindings/python/examples/gpiofind.py | 20 -------- bindings/python/examples/gpioget.py | 29 ------------ bindings/python/examples/gpioinfo.py | 28 ----------- bindings/python/examples/gpiomon.py | 26 ---------- bindings/python/examples/gpionotify.py | 21 --------- bindings/python/examples/gpioset.py | 36 -------------- bindings/python/examples/helpers.py | 15 ------ .../examples/reconfigure_input_to_output.py | 39 +++++++++++++++ .../examples/toggle_multiple_line_values.py | 47 +++++++++++++++++++ bindings/python/examples/watch_line_info.py | 23 +++++++++ bindings/python/examples/watch_line_rising.py | 32 +++++++++++++ bindings/python/examples/watch_line_value.py | 7 +-- .../examples/watch_multiple_line_values.py | 42 +++++++++++++++++ 20 files changed, 317 insertions(+), 205 deletions(-) create mode 100755 bindings/python/examples/find_line_by_name.py create mode 100755 bindings/python/examples/get_chip_info.py create mode 100755 bindings/python/examples/get_line_info.py create mode 100755 bindings/python/examples/get_multiple_line_values.py delete mode 100755 bindings/python/examples/gpiodetect.py delete mode 100755 bindings/python/examples/gpiofind.py delete mode 100755 bindings/python/examples/gpioget.py delete mode 100755 bindings/python/examples/gpioinfo.py delete mode 100755 bindings/python/examples/gpiomon.py delete mode 100755 bindings/python/examples/gpionotify.py delete mode 100755 bindings/python/examples/gpioset.py delete mode 100644 bindings/python/examples/helpers.py create mode 100755 bindings/python/examples/reconfigure_input_to_output.py create mode 100755 bindings/python/examples/toggle_multiple_line_values.py create mode 100755 bindings/python/examples/watch_line_info.py create mode 100755 bindings/python/examples/watch_line_rising.py create mode 100755 bindings/python/examples/watch_multiple_line_values.py diff --git a/bindings/python/examples/Makefile.am b/bindings/python/examples/Makefile.am index c8c1c98..52abafc 100644 --- a/bindings/python/examples/Makefile.am +++ b/bindings/python/examples/Makefile.am @@ -3,13 +3,15 @@ EXTRA_DIST = \ async_watch_line_value.py \ + find_line_by_name.py \ + get_chip_info.py \ + get_line_info.py \ get_line_value.py \ - gpiodetect.py \ - gpiofind.py \ - gpioget.py \ - gpioinfo.py \ - gpiomon.py \ - gpionotify.py \ - gpioset.py \ + get_multiple_line_values.py \ + reconfigure_input_to_output.py \ toggle_line_value.py \ - watch_line_value.py + toggle_multiple_line_values.py \ + watch_line_requests.py \ + watch_line_value.py \ + watch_line_rising.py \ + watch_multiple_line_values.py diff --git a/bindings/python/examples/async_watch_line_value.py b/bindings/python/examples/async_watch_line_value.py index ea8314f..1d6a184 100755 --- a/bindings/python/examples/async_watch_line_value.py +++ b/bindings/python/examples/async_watch_line_value.py @@ -11,9 +11,9 @@ from datetime import timedelta from gpiod.line import Bias, Edge -def edge_type(event): +def edge_type_str(event): if event.event_type is event.Type.RISING_EDGE: - return "Rising " + return "Rising" if event.event_type is event.Type.FALLING_EDGE: return "Falling" return "Unknown" @@ -41,8 +41,9 @@ def async_watch_line_value(chip_path, line_offset): poll.poll() for event in request.read_edge_events(): print( - "offset: %d, type: %s, event #%d" - % (event.line_offset, edge_type(event), event.line_seqno) + "offset: {} type: {:<7} event #{}".format( + event.line_offset, edge_type_str(event), event.line_seqno + ) ) diff --git a/bindings/python/examples/find_line_by_name.py b/bindings/python/examples/find_line_by_name.py new file mode 100755 index 0000000..ac798a9 --- /dev/null +++ b/bindings/python/examples/find_line_by_name.py @@ -0,0 +1,37 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of finding a line with the given name.""" + +import gpiod +import os + + +def generate_gpio_chips(): + for entry in os.scandir("/dev/"): + if gpiod.is_gpiochip_device(entry.path): + yield entry.path + + +def find_line_by_name(line_name): + # Names are not guaranteed unique, so this finds the first line with + # the given name. + for path in generate_gpio_chips(): + with gpiod.Chip(path) as chip: + try: + offset = chip.line_offset_from_id(line_name) + print("{}: {} {}".format(line_name, chip.get_info().name, offset)) + return + except OSError: + # An OSError is raised if the name is not found. + continue + + print("line '{}' not found".format(line_name)) + + +if __name__ == "__main__": + try: + find_line_by_name("GPIO19") + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/get_chip_info.py b/bindings/python/examples/get_chip_info.py new file mode 100755 index 0000000..7dc76fb --- /dev/null +++ b/bindings/python/examples/get_chip_info.py @@ -0,0 +1,20 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of reading the info for a chip.""" + +import gpiod + + +def get_chip_info(chip_path): + with gpiod.Chip(chip_path) as chip: + info = chip.get_info() + print("{} [{}] ({} lines)".format(info.name, info.label, info.num_lines)) + + +if __name__ == "__main__": + try: + get_chip_info("/dev/gpiochip0") + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/get_line_info.py b/bindings/python/examples/get_line_info.py new file mode 100755 index 0000000..cd4ebcc --- /dev/null +++ b/bindings/python/examples/get_line_info.py @@ -0,0 +1,29 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of reading the info for a line.""" + +import gpiod + + +def get_line_info(chip_path, line_offset): + with gpiod.Chip(chip_path) as chip: + info = chip.get_line_info(line_offset) + is_input = info.direction == gpiod.line.Direction.INPUT + print( + "line {:>3}: {:>12} {:>12} {:>8} {:>10}".format( + info.offset, + info.name or "unnamed", + info.consumer or "unused", + "input" if is_input else "output", + "active-low" if info.active_low else "active-high", + ) + ) + + +if __name__ == "__main__": + try: + get_line_info("/dev/gpiochip0", 3) + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/get_multiple_line_values.py b/bindings/python/examples/get_multiple_line_values.py new file mode 100755 index 0000000..46cf0b2 --- /dev/null +++ b/bindings/python/examples/get_multiple_line_values.py @@ -0,0 +1,29 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of reading multiple lines.""" + +import gpiod + +from gpiod.line import Direction + + +def get_multiple_line_values(chip_path, line_offsets): + with gpiod.request_lines( + chip_path, + consumer="get-multiple-line-values", + config={tuple(line_offsets): gpiod.LineSettings(direction=Direction.INPUT)}, + ) as request: + vals = request.get_values() + + for offset, val in zip(line_offsets, vals): + print("{}={} ".format(offset, val), end="") + print() + + +if __name__ == "__main__": + try: + get_multiple_line_values("/dev/gpiochip0", [5, 3, 7]) + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/gpiodetect.py b/bindings/python/examples/gpiodetect.py deleted file mode 100755 index dc98b03..0000000 --- a/bindings/python/examples/gpiodetect.py +++ /dev/null @@ -1,15 +0,0 @@ -#!/usr/bin/env python3 -# SPDX-License-Identifier: GPL-2.0-or-later -# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski - -"""Reimplementation of the gpiodetect tool in Python.""" - -import gpiod -import os - -from helpers import gpio_chips - -if __name__ == "__main__": - for chip in gpio_chips(): - info = chip.get_info() - print("{} [{}] ({} lines)".format(info.name, info.label, info.num_lines)) diff --git a/bindings/python/examples/gpiofind.py b/bindings/python/examples/gpiofind.py deleted file mode 100755 index d41660d..0000000 --- a/bindings/python/examples/gpiofind.py +++ /dev/null @@ -1,20 +0,0 @@ -#!/usr/bin/env python3 -# SPDX-License-Identifier: GPL-2.0-or-later -# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski - -"""Reimplementation of the gpiofind tool in Python.""" - -import gpiod -import os -import sys - -if __name__ == "__main__": - for entry in os.scandir("/dev/"): - if gpiod.is_gpiochip_device(entry.path): - with gpiod.Chip(entry.path) as chip: - offset = chip.line_offset_from_id(sys.argv[1]) - if offset is not None: - print("{} {}".format(chip.get_info().name, offset)) - sys.exit(0) - - sys.exit(1) diff --git a/bindings/python/examples/gpioget.py b/bindings/python/examples/gpioget.py deleted file mode 100755 index bf7e0a6..0000000 --- a/bindings/python/examples/gpioget.py +++ /dev/null @@ -1,29 +0,0 @@ -#!/usr/bin/env python3 -# SPDX-License-Identifier: GPL-2.0-or-later -# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski - -"""Simplified reimplementation of the gpioget tool in Python.""" - -import gpiod -import sys - -from gpiod.line import Direction - -if __name__ == "__main__": - if len(sys.argv) < 3: - raise TypeError("usage: gpioget.py ...") - - path = sys.argv[1] - lines = [int(line) if line.isdigit() else line for line in sys.argv[2:]] - - request = gpiod.request_lines( - path, - consumer="gpioget.py", - config={tuple(lines): gpiod.LineSettings(direction=Direction.INPUT)}, - ) - - vals = request.get_values() - - for val in vals: - print("{} ".format(val.value), end="") - print() diff --git a/bindings/python/examples/gpioinfo.py b/bindings/python/examples/gpioinfo.py deleted file mode 100755 index 3996dcf..0000000 --- a/bindings/python/examples/gpioinfo.py +++ /dev/null @@ -1,28 +0,0 @@ -#!/usr/bin/env python3 -# SPDX-License-Identifier: GPL-2.0-or-later -# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski - -"""Simplified reimplementation of the gpioinfo tool in Python.""" - -import gpiod -import os - -from helpers import gpio_chips - -if __name__ == "__main__": - for chip in gpio_chips(): - cinfo = chip.get_info() - print("{} - {} lines:".format(cinfo.name, cinfo.num_lines)) - - for offset in range(0, cinfo.num_lines): - linfo = chip.get_line_info(offset) - is_input = linfo.direction == gpiod.line.Direction.INPUT - print( - "\tline {:>3}: {:>18} {:>12} {:>8} {:>10}".format( - linfo.offset, - linfo.name or "unnamed", - linfo.consumer or "unused", - "input" if is_input else "output", - "active-low" if linfo.active_low else "active-high", - ) - ) diff --git a/bindings/python/examples/gpiomon.py b/bindings/python/examples/gpiomon.py deleted file mode 100755 index 702d7c8..0000000 --- a/bindings/python/examples/gpiomon.py +++ /dev/null @@ -1,26 +0,0 @@ -#!/usr/bin/env python3 -# SPDX-License-Identifier: GPL-2.0-or-later -# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski - -"""Simplified reimplementation of the gpiomon tool in Python.""" - -import gpiod -import sys - -from gpiod.line import Edge - -if __name__ == "__main__": - if len(sys.argv) < 3: - raise TypeError("usage: gpiomon.py ...") - - path = sys.argv[1] - lines = [int(line) if line.isdigit() else line for line in sys.argv[2:]] - - with gpiod.request_lines( - path, - consumer="gpiomon.py", - config={tuple(lines): gpiod.LineSettings(edge_detection=Edge.BOTH)}, - ) as request: - while True: - for event in request.read_edge_events(): - print(event) diff --git a/bindings/python/examples/gpionotify.py b/bindings/python/examples/gpionotify.py deleted file mode 100755 index 4e50515..0000000 --- a/bindings/python/examples/gpionotify.py +++ /dev/null @@ -1,21 +0,0 @@ -#!/usr/bin/env python3 -# SPDX-License-Identifier: GPL-2.0-or-later -# SPDX-FileCopyrightText: 2023 Bartosz Golaszewski - -"""Simplified reimplementation of the gpionotify tool in Python.""" - -import gpiod -import sys - -if __name__ == "__main__": - if len(sys.argv) < 3: - raise TypeError("usage: gpionotify.py ...") - - path = sys.argv[1] - - with gpiod.Chip(path) as chip: - for line in sys.argv[2:]: - chip.watch_line_info(line) - - while True: - print(chip.read_info_event()) diff --git a/bindings/python/examples/gpioset.py b/bindings/python/examples/gpioset.py deleted file mode 100755 index e6a516c..0000000 --- a/bindings/python/examples/gpioset.py +++ /dev/null @@ -1,36 +0,0 @@ -#!/usr/bin/env python3 -# SPDX-License-Identifier: GPL-2.0-or-later -# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski - -"""Simplified reimplementation of the gpioset tool in Python.""" - -import gpiod -import sys - -from gpiod.line import Direction, Value - -if __name__ == "__main__": - if len(sys.argv) < 3: - raise TypeError( - "usage: gpioset.py = = ..." - ) - - path = sys.argv[1] - - def parse_value(arg): - x, y = arg.split("=") - return (x, Value(int(y))) - - def make_settings(val): - return gpiod.LineSettings(direction=Direction.OUTPUT, output_value=val) - - lvs = [parse_value(arg) for arg in sys.argv[2:]] - config = dict((l, make_settings(v)) for (l, v) in lvs) - - request = gpiod.request_lines( - path, - consumer="gpioset.py", - config=config, - ) - - input() diff --git a/bindings/python/examples/helpers.py b/bindings/python/examples/helpers.py deleted file mode 100644 index 8b91173..0000000 --- a/bindings/python/examples/helpers.py +++ /dev/null @@ -1,15 +0,0 @@ -# SPDX-License-Identifier: LGPL-2.1-or-later -# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski - -import gpiod -import os - - -def gpio_chips(): - for path in [ - entry.path - for entry in os.scandir("/dev/") - if gpiod.is_gpiochip_device(entry.path) - ]: - with gpiod.Chip(path) as chip: - yield chip diff --git a/bindings/python/examples/reconfigure_input_to_output.py b/bindings/python/examples/reconfigure_input_to_output.py new file mode 100755 index 0000000..0f2e358 --- /dev/null +++ b/bindings/python/examples/reconfigure_input_to_output.py @@ -0,0 +1,39 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Example of a bi-directional line requested as input and then switched to output.""" + +import gpiod + +from gpiod.line import Direction, Value + + +def reconfigure_input_to_output(chip_path, line_offset): + # request the line initially as an input + with gpiod.request_lines( + chip_path, + consumer="reconfigure-input-to-output", + config={line_offset: gpiod.LineSettings(direction=Direction.INPUT)}, + ) as request: + # read the current line value + value = request.get_value(line_offset) + print("{}={} (input)".format(line_offset, value)) + # switch the line to an output and drive it low + request.reconfigure_lines( + config={ + line_offset: gpiod.LineSettings( + direction=Direction.OUTPUT, output_value=Value.INACTIVE + ) + } + ) + # report the current driven value + value = request.get_value(line_offset) + print("{}={} (output)".format(line_offset, value)) + + +if __name__ == "__main__": + try: + reconfigure_input_to_output("/dev/gpiochip0", 5) + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/toggle_multiple_line_values.py b/bindings/python/examples/toggle_multiple_line_values.py new file mode 100755 index 0000000..12b968d --- /dev/null +++ b/bindings/python/examples/toggle_multiple_line_values.py @@ -0,0 +1,47 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of toggling multiple lines.""" + +import gpiod +import time + +from gpiod.line import Direction, Value + + +def toggle_value(value): + if value == Value.INACTIVE: + return Value.ACTIVE + return Value.INACTIVE + + +def toggle_multiple_line_values(chip_path, line_values): + value_str = {Value.ACTIVE: "Active", Value.INACTIVE: "Inactive"} + + request = gpiod.request_lines( + chip_path, + consumer="toggle-multiple-line-values", + config={ + tuple(line_values.keys()): gpiod.LineSettings(direction=Direction.OUTPUT) + }, + output_values=line_values, + ) + + while True: + print( + " ".join("{}={}".format(l, value_str[v]) for (l, v) in line_values.items()) + ) + time.sleep(1) + for l, v in line_values.items(): + line_values[l] = toggle_value(v) + request.set_values(line_values) + + +if __name__ == "__main__": + try: + toggle_multiple_line_values( + "/dev/gpiochip0", {5: Value.ACTIVE, 3: Value.ACTIVE, 7: Value.INACTIVE} + ) + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/watch_line_info.py b/bindings/python/examples/watch_line_info.py new file mode 100755 index 0000000..e49a669 --- /dev/null +++ b/bindings/python/examples/watch_line_info.py @@ -0,0 +1,23 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of watching for info changes on particular lines.""" + +import gpiod + + +def watch_line_info(chip_path, line_offsets): + with gpiod.Chip(chip_path) as chip: + for offset in line_offsets: + chip.watch_line_info(offset) + + while True: + print(chip.read_info_event()) + + +if __name__ == "__main__": + try: + watch_line_info("/dev/gpiochip0", [5, 3, 7]) + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/watch_line_rising.py b/bindings/python/examples/watch_line_rising.py new file mode 100755 index 0000000..7b1c6b0 --- /dev/null +++ b/bindings/python/examples/watch_line_rising.py @@ -0,0 +1,32 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of watching for rising edges on a single line.""" + +import gpiod + +from gpiod.line import Edge + + +def watch_line_rising(chip_path, line_offset): + with gpiod.request_lines( + chip_path, + consumer="watch-line-rising", + config={line_offset: gpiod.LineSettings(edge_detection=Edge.RISING)}, + ) as request: + while True: + # Blocks until at least one event is available + for event in request.read_edge_events(): + print( + "line: {} type: Rising event #{}".format( + event.line_offset, event.line_seqno + ) + ) + + +if __name__ == "__main__": + try: + watch_line_rising("/dev/gpiochip0", 5) + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation") diff --git a/bindings/python/examples/watch_line_value.py b/bindings/python/examples/watch_line_value.py index 841bf40..171a67c 100755 --- a/bindings/python/examples/watch_line_value.py +++ b/bindings/python/examples/watch_line_value.py @@ -10,7 +10,7 @@ from datetime import timedelta from gpiod.line import Bias, Edge -def edge_type(event): +def edge_type_str(event): if event.event_type is event.Type.RISING_EDGE: return "Rising" if event.event_type is event.Type.FALLING_EDGE: @@ -36,8 +36,9 @@ def watch_line_value(chip_path, line_offset): # Blocks until at least one event is available for event in request.read_edge_events(): print( - "line: %d type: %-7s event #%d" - % (event.line_offset, edge_type(event), event.line_seqno) + "line: {} type: {:<7} event #{}".format( + event.line_offset, edge_type_str(event), event.line_seqno + ) ) diff --git a/bindings/python/examples/watch_multiple_line_values.py b/bindings/python/examples/watch_multiple_line_values.py new file mode 100755 index 0000000..5906b7d --- /dev/null +++ b/bindings/python/examples/watch_multiple_line_values.py @@ -0,0 +1,42 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-or-later +# SPDX-FileCopyrightText: 2023 Kent Gibson + +"""Minimal example of watching for edges on multiple lines.""" + +import gpiod + +from gpiod.line import Edge + + +def edge_type_str(event): + if event.event_type is event.Type.RISING_EDGE: + return "Rising" + if event.event_type is event.Type.FALLING_EDGE: + return "Falling" + return "Unknown" + + +def watch_multiple_line_values(chip_path, line_offsets): + with gpiod.request_lines( + chip_path, + consumer="watch-multiple-line-values", + config={tuple(line_offsets): gpiod.LineSettings(edge_detection=Edge.BOTH)}, + ) as request: + while True: + for event in request.read_edge_events(): + print( + "offset: {} type: {:<7} event #{} line event #{}".format( + event.line_offset, + edge_type_str(event), + event.global_seqno, + event.line_seqno, + ) + ) + + +if __name__ == "__main__": + try: + watch_multiple_line_values("/dev/gpiochip0", [5, 3, 7]) + except OSError as ex: + print(ex, "\nCustomise the example configuration to suit your situation")