@@ -19,12 +19,8 @@ def edge_type(event):
return "Unknown"
-def async_watch_line_value():
- # example configuration - customise to suit your situation
- chip_path = "/dev/gpiochip0"
- line_offset = 5
-
- # assume a button connecting the pin to ground,
+def async_watch_line_value(chip_path, line_offset):
+ # Assume a button connecting the pin to ground,
# so pull it up and provide some debounce.
with gpiod.request_lines(
chip_path,
@@ -40,7 +36,7 @@ def async_watch_line_value():
poll = select.poll()
poll.register(request.fd, select.POLLIN)
while True:
- # other fds could be registered with the poll and be handled
+ # Other fds could be registered with the poll and be handled
# separately using the return value (fd, event) from poll()
poll.poll()
for event in request.read_edge_events():
@@ -51,4 +47,7 @@ def async_watch_line_value():
if __name__ == "__main__":
- async_watch_line_value()
+ try:
+ async_watch_line_value("/dev/gpiochip0", 5)
+ except OSError as ex:
+ print(ex, "\nCustomise the example configuration to suit your situation")
@@ -9,19 +9,18 @@ import gpiod
from gpiod.line import Direction
-def get_line_value():
- # example configuration - customise to suit your situation
- chip_path = "/dev/gpiochip0"
- line_offset = 5
-
+def get_line_value(chip_path, line_offset):
with gpiod.request_lines(
chip_path,
consumer="get-line-value",
config={line_offset: gpiod.LineSettings(direction=Direction.INPUT)},
) as request:
value = request.get_value(line_offset)
- print(value)
+ print("{}={}".format(line_offset, value))
if __name__ == "__main__":
- get_line_value()
+ try:
+ get_line_value("/dev/gpiochip0", 5)
+ except OSError as ex:
+ print(ex, "\nCustomise the example configuration to suit your situation")
@@ -16,21 +16,11 @@ def toggle_value(value):
return Value.INACTIVE
-def print_value(value):
- if value == Value.ACTIVE:
- print("Active")
- else:
- print("Inactive")
-
-
-def toggle_line_value():
- # example configuration - customise to suit your situation
- chip_path = "/dev/gpiochip0"
- line_offset = 5
-
+def toggle_line_value(chip_path, line_offset):
+ value_str = {Value.ACTIVE: "Active", Value.INACTIVE: "Inactive"}
value = Value.ACTIVE
- request = gpiod.request_lines(
+ with gpiod.request_lines(
chip_path,
consumer="toggle-line-value",
config={
@@ -38,14 +28,16 @@ def toggle_line_value():
direction=Direction.OUTPUT, output_value=value
)
},
- )
-
- while True:
- print_value(value)
- time.sleep(1)
- value = toggle_value(value)
- request.set_value(line_offset, value)
+ ) as request:
+ while True:
+ print("{}={}".format(line_offset, value_str[value]))
+ time.sleep(1)
+ value = toggle_value(value)
+ request.set_value(line_offset, value)
if __name__ == "__main__":
- toggle_line_value()
+ try:
+ toggle_line_value("/dev/gpiochip0", 5)
+ except OSError as ex:
+ print(ex, "\nCustomise the example configuration to suit your situation")
@@ -12,18 +12,14 @@ from gpiod.line import Bias, Edge
def edge_type(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"
-def watch_line_value():
- # example configuration - customise to suit your situation
- chip_path = "/dev/gpiochip0"
- line_offset = 5
-
- # assume a button connecting the pin to ground,
+def watch_line_value(chip_path, line_offset):
+ # Assume a button connecting the pin to ground,
# so pull it up and provide some debounce.
with gpiod.request_lines(
chip_path,
@@ -37,13 +33,16 @@ def watch_line_value():
},
) as request:
while True:
- # blocks until at least one event is available
+ # Blocks until at least one event is available
for event in request.read_edge_events():
print(
- "offset: %d, type: %s, event #%d"
+ "line: %d type: %-7s event #%d"
% (event.line_offset, edge_type(event), event.line_seqno)
)
if __name__ == "__main__":
- watch_line_value()
+ try:
+ watch_line_value("/dev/gpiochip0", 5)
+ except OSError as ex:
+ print(ex, "\nCustomise the example configuration to suit your situation")
A collection of minor changes to be more consistent with other examples: - capitalize comments - add line offset to value outputs - drop comma from edge event outputs - improve behaviour if run on a platform that does not match the example configuration - use with to cleanup request in toggle_line_value.py Signed-off-by: Kent Gibson <warthog618@gmail.com> --- .../python/examples/async_watch_line_value.py | 15 ++++---- bindings/python/examples/get_line_value.py | 13 ++++--- bindings/python/examples/toggle_line_value.py | 34 +++++++------------ bindings/python/examples/watch_line_value.py | 19 +++++------ 4 files changed, 35 insertions(+), 46 deletions(-)