@@ -59,62 +59,150 @@ There are currently six command-line tools available:
* gpiodetect - list all gpiochips present on the system, their names, labels
and number of GPIO lines
-* gpioinfo - list all lines of specified gpiochips, their names, consumers,
- direction, active state and additional flags
+* gpioinfo - list lines, their gpiochip, offset, name, and direction, and
+ if in use then the consumer name and any other configured
+ attributes, such as active state, bias, drive, edge detection
+ and debounce period
* gpioget - read values of specified GPIO lines
-* gpioset - set values of specified GPIO lines, potentially keep the lines
- exported and wait until timeout, user input or signal
+* gpioset - set values of specified GPIO lines, holding the lines until the
+ process is killed or otherwise exits
-* gpiofind - find the gpiochip name and line offset given the line name
-
-* gpiomon - wait for events on GPIO lines, specify which events to watch,
- how many events to process before exiting or if the events
+* gpiomon - wait for edge events on GPIO lines, specify which edges to watch
+ for, how many events to process before exiting, or if the events
should be reported to the console
+* gpionotify - wait for changed to the info for GPIO lines, specify which
+ changes to watch for, how many events to process before exiting,
+ or if the events should be reported to the console
+
Examples:
- # Read the value of a single GPIO line.
- $ gpioget gpiochip1 23
- 0
+ (using a Raspberry Pi 4B)
+
+ # Detect the available gpiochips.
+ $ gpiodetect
+ gpiochip0 [pinctrl-bcm2711] (58 lines)
+ gpiochip1 [raspberrypi-exp-gpio] (8 lines)
+
+ # Read the info for all the lines on a gpiochip.
+ $ gpioinfo -c 1
+ gpiochip1 - 8 lines:
+ line 0: "BT_ON" output
+ line 1: "WL_ON" output
+ line 2: "PWR_LED_OFF" output active-low consumer="led1"
+ line 3: "GLOBAL_RESET" output
+ line 4: "VDD_SD_IO_SEL" output consumer="vdd-sd-io"
+ line 5: "CAM_GPIO" output consumer="cam1_regulator"
+ line 6: "SD_PWR_ON" output consumer="sd_vcc_reg"
+ line 7: "SD_OC_N" input
+
+ # Read the info for particular lines.
+ $ ./gpioinfo PWR_LED_OFF STATUS_LED_G_CLK GLOBAL_RESET
+ gpiochip0 42 "STATUS_LED_G_CLK" output consumer="led0"
+ gpiochip1 2 "PWR_LED_OFF" output active-low consumer="led1"
+ gpiochip1 3 "GLOBAL_RESET" output
+
+ # Read the value of a single GPIO line by name.
+ $ gpioget RXD1
+ "RXD1"=active
+
+ # Read the value of a single GPIO line by chip and offset.
+ $ gpioget -c 0 15
+ "15"=active
+
+ # Read the value of a single GPIO line as a numeric value.
+ $ gpioget --numeric RXD1
+ 1
# Read two values at the same time. Set the active state of the lines
- # to low.
- $ gpioget --active-low gpiochip1 23 24
- 1 1
-
- # Set values of two lines, then daemonize and wait for a signal (SIGINT or
- # SIGTERM) before releasing them.
- $ gpioset --mode=signal --background gpiochip1 23=1 24=0
-
- # Set the value of a single line, then exit immediately. This is useful
- # for floating pins.
- $ gpioset gpiochip1 23=1
-
- # Find a GPIO line by name.
- $ gpiofind "USR-LED-2"
- gpiochip1 23
-
- # Toggle a GPIO by name, then wait for the user to press ENTER.
- $ gpioset --mode=wait `gpiofind "USR-LED-2"`=1
+ # to low and without quoted names.
+ $ gpioget --active-low --unquoted GPIO23 GPIO24
+ GPIO23=active GPIO24=active
+
+ # Set the value of a line and hold the line until killed.
+ $ gpioset GPIO23=1
+
+ # Set values of two lines, then daemonize and hold the lines.
+ $ gpioset --daemonize GPIO23=1 GPIO24=0
+
+ # Set the value of a single line, hold it for 20ms, then exit.
+ $ gpioset --hold-period 20ms -t0 GPIO23=1
+
+ # Blink an LED on GPIO22 at 1Hz
+ $ gpioset -t500ms GPIO22=1
+
+ # Blink an LED on GPIO22 at 1Hz with a 20% duty cycle
+ $ gpioset -t200ms,800ms GPIO22=1
+
+ # Set some lines interactively (requires --enable-gpioset-interative)
+ $ gpioset --interactive --unquoted GPIO23=inactive GPIO24=active
+ gpioset> get
+ GPIO23=inactive GPIO24=active
+ gpioset> toggle
+ gpioset> get
+ GPIO23=active GPIO24=inactive
+ gpioset> set GPIO24=1
+ gpioset> get
+ GPIO23=active GPIO24=active
+ gpioset> toggle
+ gpioset> get
+ GPIO23=inactive GPIO24=inactive
+ gpioset> toggle GPIO23
+ gpioset> get
+ GPIO23=active GPIO24=inactive
+ gpioset> exit
# Wait for three rising edge events on a single GPIO line, then exit.
- $ gpiomon --num-events=3 --rising-edge gpiochip2 3
- event: RISING EDGE offset: 3 timestamp: [ 1151.814356387]
- event: RISING EDGE offset: 3 timestamp: [ 1151.815449803]
- event: RISING EDGE offset: 3 timestamp: [ 1152.091556803]
-
- # Wait for a single falling edge event. Specify a custom output format.
- $ gpiomon --format="%e %o %s %n" --falling-edge gpiochip1 4
- 0 4 1156 615459801
-
- # Pause execution until a single event of any type occurs. Don't print
- # anything. Find the line by name.
- $ gpiomon --num-events=1 --silent `gpiofind "USR-IN"`
-
- # Monitor multiple lines, exit after the first event.
- $ gpiomon --silent --num-events=1 gpiochip0 2 3 5
+ $ gpiomon --num-events=3 --edges=rising GPIO22
+ 10002.907638045 rising "GPIO22"
+ 10037.132562259 rising "GPIO22"
+ 10047.179790748 rising "GPIO22"
+
+ # Wait for three edge events on a single GPIO line, with time in local time
+ # and with unquoted line name, then exit.
+ $ gpiomon --num-events=3 --edges=both --localtime --unquoted GPIO22
+ 2022-11-15T10:36:59.109615508 rising GPIO22
+ 2022-11-15T10:36:59.129681898 falling GPIO22
+ 2022-11-15T10:36:59.698971886 rising GPIO22
+
+ # Wait for falling edge events with a custom output format.
+ $ gpiomon --format="%e %c %o %l %S" --edges=falling -c gpiochip0 22
+ 2 gpiochip0 22 GPIO22 10946.693481859
+ 2 gpiochip0 22 GPIO22 10947.025347604
+ 2 gpiochip0 22 GPIO22 10947.283716669
+ 2 gpiochip0 22 GPIO22 10947.570109430
+ ...
+
+ # Block until an edge event occurs. Don't print anything.
+ $ gpiomon --num-events=1 --quiet GPIO22
+
+ # Monitor multiple lines, exit after the first edge event.
+ $ gpiomon --quiet --num-events=1 GPIO5 GPIO6 GPIO12 GPIO17
+
+ # Monitor a line for changes to info.
+ $ gpionotify GPIO23
+ 11571.816473718 requested "GPIO23"
+ 11571.816535124 released "GPIO23"
+ 11572.722894029 requested "GPIO23"
+ 11572.722932843 released "GPIO23"
+ 11573.222998598 requested "GPIO23"
+ ...
+
+ # Monitor a line for requests, reporting UTC time and unquoted line name.
+ $ gpionotify --utc --unquoted GPIO23
+ 2022-11-15T03:05:23.807090687Z requested GPIO23
+ 2022-11-15T03:05:23.807151390Z released GPIO23
+ 2022-11-15T03:05:24.784984280Z requested GPIO23
+ 2022-11-15T03:05:24.785023873Z released GPIO23
+ ...
+
+ # Monitor multiple lines, exit after the first is requested.
+ $ gpionotify --quiet --num-events=1 --event=requested GPIO5 GPIO6 GPIO12 GPIO17
+
+ # Block until a line is released.
+ $ gpionotify --quiet --num-events=1 --event=released GPIO6
BINDINGS
--------
Update the Tools section to reflect the changes to the tools for v2. Signed-off-by: Kent Gibson <warthog618@gmail.com> --- README | 176 ++++++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 132 insertions(+), 44 deletions(-)