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pigpiod_if2.h
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pigpiod_if2.h
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/*
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to <http://unlicense.org/>
*/
#ifndef PIGPIOD_IF2_H
#define PIGPIOD_IF2_H
#include "pigpio.h"
#define PIGPIOD_IF2_VERSION 11
/*TEXT
pigpiod_if2 is a C library for the Raspberry which allows control
of the GPIO via the socket interface to the pigpio daemon.
*Features*
o hardware timed PWM on any of GPIO 0-31
o hardware timed servo pulses on any of GPIO 0-31
o callbacks when any of GPIO 0-31 change state
o callbacks at timed intervals
o reading/writing all of the GPIO in a bank as one operation
o individually setting GPIO modes, reading and writing
o notifications when any of GPIO 0-31 change state
o the construction of output waveforms with microsecond timing
o rudimentary permission control over GPIO
o a simple interface to start and stop new threads
o I2C, SPI, and serial link wrappers
o creating and running scripts on the pigpio daemon
*GPIO*
ALL GPIO are identified by their Broadcom number.
*Notes*
The PWM and servo pulses are timed using the DMA and PWM/PCM peripherals.
*Usage*
Include <pigpiod_if2.h> in your source files.
Assuming your source is in prog.c use the following command to build
. .
gcc -Wall -pthread -o prog prog.c -lpigpiod_if2 -lrt
. .
to run make sure the pigpio daemon is running
. .
sudo pigpiod
./prog # sudo is not required to run programs linked to pigpiod_if2
. .
For examples see x_pigpiod_if2.c within the pigpio archive file.
*Notes*
All the functions which return an int return < 0 on error
TEXT*/
/*OVERVIEW
ESSENTIAL
pigpio_start Connects to a pigpio daemon
pigpio_stop Disconnects from a pigpio daemon
BEGINNER
set_mode Set a GPIO mode
get_mode Get a GPIO mode
set_pull_up_down Set/clear GPIO pull up/down resistor
gpio_read Read a GPIO
gpio_write Write a GPIO
set_PWM_dutycycle Start/stop PWM pulses on a GPIO
get_PWM_dutycycle Get the PWM dutycycle in use on a GPIO
set_servo_pulsewidth Start/stop servo pulses on a GPIO
get_servo_pulsewidth Get the servo pulsewidth in use on a GPIO
callback Create GPIO level change callback
callback_ex Create GPIO level change callback, extended
callback_cancel Cancel a callback
wait_for_edge Wait for GPIO level change
INTERMEDIATE
gpio_trigger Send a trigger pulse to a GPIO.
set_watchdog Set a watchdog on a GPIO.
set_PWM_range Configure PWM range for a GPIO
get_PWM_range Get configured PWM range for a GPIO
set_PWM_frequency Configure PWM frequency for a GPIO
get_PWM_frequency Get configured PWM frequency for a GPIO
read_bank_1 Read all GPIO in bank 1
read_bank_2 Read all GPIO in bank 2
clear_bank_1 Clear selected GPIO in bank 1
clear_bank_2 Clear selected GPIO in bank 2
set_bank_1 Set selected GPIO in bank 1
set_bank_2 Set selected GPIO in bank 2
start_thread Start a new thread
stop_thread Stop a previously started thread
ADVANCED
get_PWM_real_range Get underlying PWM range for a GPIO
notify_open Request a notification handle
notify_begin Start notifications for selected GPIO
notify_pause Pause notifications
notify_close Close a notification
bb_serial_read_open Opens a GPIO for bit bang serial reads
bb_serial_read Reads bit bang serial data from a GPIO
bb_serial_read_close Closes a GPIO for bit bang serial reads
bb_serial_invert Invert serial logic (1 invert, 0 normal)
hardware_clock Start hardware clock on supported GPIO
hardware_PWM Start hardware PWM on supported GPIO
set_glitch_filter Set a glitch filter on a GPIO
set_noise_filter Set a noise filter on a GPIO
get_pad_strength Gets a pads drive strength
set_pad_strength Sets a pads drive strength
shell_ Executes a shell command
SCRIPTS
store_script Store a script
run_script Run a stored script
script_status Get script status and parameters
stop_script Stop a running script
delete_script Delete a stored script
WAVES
wave_clear Deletes all waveforms
wave_add_new Starts a new waveform
wave_add_generic Adds a series of pulses to the waveform
wave_add_serial Adds serial data to the waveform
wave_create Creates a waveform from added data
wave_delete Deletes one or more waveforms
wave_send_once Transmits a waveform once
wave_send_repeat Transmits a waveform repeatedly
wave_send_using_mode Transmits a waveform in the chosen mode
wave_chain Transmits a chain of waveforms
wave_tx_at Returns the current transmitting waveform
wave_tx_busy Checks to see if the waveform has ended
wave_tx_stop Aborts the current waveform
wave_get_micros Length in microseconds of the current waveform
wave_get_high_micros Length of longest waveform so far
wave_get_max_micros Absolute maximum allowed micros
wave_get_pulses Length in pulses of the current waveform
wave_get_high_pulses Length of longest waveform so far
wave_get_max_pulses Absolute maximum allowed pulses
wave_get_cbs Length in cbs of the current waveform
wave_get_high_cbs Length of longest waveform so far
wave_get_max_cbs Absolute maximum allowed cbs
I2C
i2c_open Opens an I2C device
i2c_close Closes an I2C device
i2c_write_quick smbus write quick
i2c_write_byte smbus write byte
i2c_read_byte smbus read byte
i2c_write_byte_data smbus write byte data
i2c_write_word_data smbus write word data
i2c_read_byte_data smbus read byte data
i2c_read_word_data smbus read word data
i2c_process_call smbus process call
i2c_write_block_data smbus write block data
i2c_read_block_data smbus read block data
i2c_block_process_call smbus block process call
i2c_write_i2c_block_data smbus write I2C block data
i2c_read_i2c_block_data smbus read I2C block data
i2c_read_device Reads the raw I2C device
i2c_write_device Writes the raw I2C device
i2c_zip Performs multiple I2C transactions
bb_i2c_open Opens GPIO for bit banging I2C
bb_i2c_close Closes GPIO for bit banging I2C
bb_i2c_zip Performs multiple bit banged I2C transactions
SPI
spi_open Opens a SPI device
spi_close Closes a SPI device
spi_read Reads bytes from a SPI device
spi_write Writes bytes to a SPI device
spi_xfer Transfers bytes with a SPI device
bb_spi_open Opens GPIO for bit banging SPI
bb_spi_close Closes GPIO for bit banging SPI
bb_spi_xfer Transfers bytes with bit banging SPI
I2C/SPI_SLAVE
bsc_xfer I2C/SPI as slave transfer
bsc_i2c I2C as slave transfer
SERIAL
serial_open Opens a serial device
serial_close Closes a serial device
serial_write_byte Writes a byte to a serial device
serial_read_byte Reads a byte from a serial device
serial_write Writes bytes to a serial device
serial_read Reads bytes from a serial device
serial_data_available Returns number of bytes ready to be read
FILES
file_open Opens a file
file_close Closes a file
file_read Reads bytes from a file
file_write Writes bytes to a file
file_seek Seeks to a position within a file
file_list List files which match a pattern
EVENTS
event_callback Sets a callback for an event
event_callback_ex Sets a callback for an event, extended
event_callback_cancel Cancel an event callback
event_trigger Triggers an event
wait_for_event Wait for an event
CUSTOM
custom_1 User custom function 1
custom_2 User custom function 2
UTILITIES
get_current_tick Get current tick (microseconds)
get_hardware_revision Get hardware revision
get_pigpio_version Get the pigpio version
pigpiod_if_version Get the pigpiod_if2 version
pigpio_error Get a text description of an error code.
time_sleep Sleeps for a float number of seconds
time_time Float number of seconds since the epoch
OVERVIEW*/
#ifdef __cplusplus
extern "C" {
#endif
typedef void (*CBFunc_t)
(int pi, unsigned user_gpio, unsigned level, uint32_t tick);
typedef void (*CBFuncEx_t)
(int pi, unsigned user_gpio, unsigned level, uint32_t tick, void *userdata);
typedef struct callback_s callback_t;
typedef void (*evtCBFunc_t)
(int pi, unsigned event, uint32_t tick);
typedef void (*evtCBFuncEx_t)
(int pi, unsigned event, uint32_t tick, void *userdata);
typedef struct evtCallback_s evtCallback_t;
/*F*/
double time_time(void);
/*D
Return the current time in seconds since the Epoch.
D*/
/*F*/
void time_sleep(double seconds);
/*D
Delay execution for a given number of seconds.
. .
seconds: the number of seconds to delay.
. .
D*/
/*F*/
char *pigpio_error(int errnum);
/*D
Return a text description for an error code.
. .
errnum: the error code.
. .
D*/
/*F*/
unsigned pigpiod_if_version(void);
/*D
Return the pigpiod_if2 version.
D*/
/*F*/
pthread_t *start_thread(gpioThreadFunc_t thread_func, void *userdata);
/*D
Starts a new thread of execution with thread_func as the main routine.
. .
thread_func: the main function for the new thread.
userdata: a pointer to an arbitrary argument.
. .
Returns a pointer to pthread_t if OK, otherwise NULL.
The function is passed the single argument userdata.
The thread can be cancelled by passing the pointer to pthread_t to
[*stop_thread*].
D*/
/*F*/
void stop_thread(pthread_t *pth);
/*D
Cancels the thread pointed at by pth.
. .
pth: the thread to be stopped.
. .
No value is returned.
The thread to be stopped should have been started with [*start_thread*].
D*/
/*F*/
int pigpio_start(char *addrStr, char *portStr);
/*D
Connect to the pigpio daemon. Reserving command and
notification streams.
. .
addrStr: specifies the host or IP address of the Pi running the
pigpio daemon. It may be NULL in which case localhost
is used unless overridden by the PIGPIO_ADDR environment
variable.
portStr: specifies the port address used by the Pi running the
pigpio daemon. It may be NULL in which case "8888"
is used unless overridden by the PIGPIO_PORT environment
variable.
. .
Returns an integer value greater than or equal to zero if OK.
This value is passed to the GPIO routines to specify the Pi
to be operated on.
D*/
/*F*/
void pigpio_stop(int pi);
/*D
Terminates the connection to a pigpio daemon and releases
resources used by the library.
. .
pi: >=0 (as returned by [*pigpio_start*]).
. .
D*/
/*F*/
int set_mode(int pi, unsigned gpio, unsigned mode);
/*D
Set the GPIO mode.
. .
pi: >=0 (as returned by [*pigpio_start*]).
gpio: 0-53.
mode: PI_INPUT, PI_OUTPUT, PI_ALT0, PI_ALT1,
PI_ALT2, PI_ALT3, PI_ALT4, PI_ALT5.
. .
Returns 0 if OK, otherwise PI_BAD_GPIO, PI_BAD_MODE,
or PI_NOT_PERMITTED.
D*/
/*F*/
int get_mode(int pi, unsigned gpio);
/*D
Get the GPIO mode.
. .
pi: >=0 (as returned by [*pigpio_start*]).
gpio: 0-53.
. .
Returns the GPIO mode if OK, otherwise PI_BAD_GPIO.
D*/
/*F*/
int set_pull_up_down(int pi, unsigned gpio, unsigned pud);
/*D
Set or clear the GPIO pull-up/down resistor.
. .
pi: >=0 (as returned by [*pigpio_start*]).
gpio: 0-53.
pud: PI_PUD_UP, PI_PUD_DOWN, PI_PUD_OFF.
. .
Returns 0 if OK, otherwise PI_BAD_GPIO, PI_BAD_PUD,
or PI_NOT_PERMITTED.
D*/
/*F*/
int gpio_read(int pi, unsigned gpio);
/*D
Read the GPIO level.
. .
pi: >=0 (as returned by [*pigpio_start*]).
gpio:0-53.
. .
Returns the GPIO level if OK, otherwise PI_BAD_GPIO.
D*/
/*F*/
int gpio_write(int pi, unsigned gpio, unsigned level);
/*D
Write the GPIO level.
. .
pi: >=0 (as returned by [*pigpio_start*]).
gpio: 0-53.
level: 0, 1.
. .
Returns 0 if OK, otherwise PI_BAD_GPIO, PI_BAD_LEVEL,
or PI_NOT_PERMITTED.
Notes
If PWM or servo pulses are active on the GPIO they are switched off.
D*/
/*F*/
int set_PWM_dutycycle(int pi, unsigned user_gpio, unsigned dutycycle);
/*D
Start (non-zero dutycycle) or stop (0) PWM pulses on the GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
dutycycle: 0-range (range defaults to 255).
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, PI_BAD_DUTYCYCLE,
or PI_NOT_PERMITTED.
Notes
The [*set_PWM_range*] function may be used to change the
default range of 255.
D*/
/*F*/
int get_PWM_dutycycle(int pi, unsigned user_gpio);
/*D
Return the PWM dutycycle in use on a GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO or PI_NOT_PWM_GPIO.
For normal PWM the dutycycle will be out of the defined range
for the GPIO (see [*get_PWM_range*]).
If a hardware clock is active on the GPIO the reported dutycycle
will be 500000 (500k) out of 1000000 (1M).
If hardware PWM is active on the GPIO the reported dutycycle
will be out of a 1000000 (1M).
D*/
/*F*/
int set_PWM_range(int pi, unsigned user_gpio, unsigned range);
/*D
Set the range of PWM values to be used on the GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
range: 25-40000.
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, PI_BAD_DUTYRANGE,
or PI_NOT_PERMITTED.
Notes
If PWM is currently active on the GPIO its dutycycle will be
scaled to reflect the new range.
The real range, the number of steps between fully off and fully on
for each of the 18 available GPIO frequencies is
. .
25(#1), 50(#2), 100(#3), 125(#4), 200(#5), 250(#6),
400(#7), 500(#8), 625(#9), 800(#10), 1000(#11), 1250(#12),
2000(#13), 2500(#14), 4000(#15), 5000(#16), 10000(#17), 20000(#18)
. .
The real value set by set_PWM_range is (dutycycle * real range) / range.
D*/
/*F*/
int get_PWM_range(int pi, unsigned user_gpio);
/*D
Get the range of PWM values being used on the GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
. .
Returns the dutycycle range used for the GPIO if OK,
otherwise PI_BAD_USER_GPIO.
If a hardware clock or hardware PWM is active on the GPIO the
reported range will be 1000000 (1M).
D*/
/*F*/
int get_PWM_real_range(int pi, unsigned user_gpio);
/*D
Get the real underlying range of PWM values being used on the GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
. .
Returns the real range used for the GPIO if OK,
otherwise PI_BAD_USER_GPIO.
If a hardware clock is active on the GPIO the reported
real range will be 1000000 (1M).
If hardware PWM is active on the GPIO the reported real range
will be approximately 250M divided by the set PWM frequency.
D*/
/*F*/
int set_PWM_frequency(int pi, unsigned user_gpio, unsigned frequency);
/*D
Set the frequency (in Hz) of the PWM to be used on the GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
frequency: >=0 (Hz).
. .
Returns the numerically closest frequency if OK, otherwise
PI_BAD_USER_GPIO or PI_NOT_PERMITTED.
If PWM is currently active on the GPIO it will be switched
off and then back on at the new frequency.
Each GPIO can be independently set to one of 18 different
PWM frequencies.
The selectable frequencies depend upon the sample rate which
may be 1, 2, 4, 5, 8, or 10 microseconds (default 5). The
sample rate is set when the pigpio daemon is started.
The frequencies for each sample rate are:
. .
Hertz
1: 40000 20000 10000 8000 5000 4000 2500 2000 1600
1250 1000 800 500 400 250 200 100 50
2: 20000 10000 5000 4000 2500 2000 1250 1000 800
625 500 400 250 200 125 100 50 25
4: 10000 5000 2500 2000 1250 1000 625 500 400
313 250 200 125 100 63 50 25 13
sample
rate
(us) 5: 8000 4000 2000 1600 1000 800 500 400 320
250 200 160 100 80 50 40 20 10
8: 5000 2500 1250 1000 625 500 313 250 200
156 125 100 63 50 31 25 13 6
10: 4000 2000 1000 800 500 400 250 200 160
125 100 80 50 40 25 20 10 5
. .
D*/
/*F*/
int get_PWM_frequency(int pi, unsigned user_gpio);
/*D
Get the frequency of PWM being used on the GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
. .
For normal PWM the frequency will be that defined for the GPIO by
[*set_PWM_frequency*].
If a hardware clock is active on the GPIO the reported frequency
will be that set by [*hardware_clock*].
If hardware PWM is active on the GPIO the reported frequency
will be that set by [*hardware_PWM*].
Returns the frequency (in hertz) used for the GPIO if OK,
otherwise PI_BAD_USER_GPIO.
D*/
/*F*/
int set_servo_pulsewidth(int pi, unsigned user_gpio, unsigned pulsewidth);
/*D
Start (500-2500) or stop (0) servo pulses on the GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
pulsewidth: 0 (off), 500 (anti-clockwise) - 2500 (clockwise).
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, PI_BAD_PULSEWIDTH or
PI_NOT_PERMITTED.
The selected pulsewidth will continue to be transmitted until
changed by a subsequent call to set_servo_pulsewidth.
The pulsewidths supported by servos varies and should probably be
determined by experiment. A value of 1500 should always be safe and
represents the mid-point of rotation.
You can DAMAGE a servo if you command it to move beyond its limits.
OTHER UPDATE RATES:
This function updates servos at 50Hz. If you wish to use a different
update frequency you will have to use the PWM functions.
. .
Update Rate (Hz) 50 100 200 400 500
1E6/Hz 20000 10000 5000 2500 2000
. .
Firstly set the desired PWM frequency using [*set_PWM_frequency*].
Then set the PWM range using [*set_PWM_range*] to 1E6/Hz.
Doing this allows you to use units of microseconds when setting
the servo pulsewidth.
E.g. If you want to update a servo connected to GPIO 25 at 400Hz
. .
set_PWM_frequency(25, 400);
set_PWM_range(25, 2500);
. .
Thereafter use the [*set_PWM_dutycycle*] function to move the servo,
e.g. set_PWM_dutycycle(25, 1500) will set a 1500 us pulse.
D*/
/*F*/
int get_servo_pulsewidth(int pi, unsigned user_gpio);
/*D
Return the servo pulsewidth in use on a GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO or PI_NOT_SERVO_GPIO.
D*/
/*F*/
int notify_open(int pi);
/*D
Get a free notification handle.
. .
pi: >=0 (as returned by [*pigpio_start*]).
. .
Returns a handle greater than or equal to zero if OK,
otherwise PI_NO_HANDLE.
A notification is a method for being notified of GPIO state
changes via a pipe.
Pipes are only accessible from the local machine so this function
serves no purpose if you are using the library from a remote machine.
The in-built (socket) notifications provided by [*callback*]
should be used instead.
Notifications for handle x will be available at the pipe
named /dev/pigpiox (where x is the handle number).
E.g. if the function returns 15 then the notifications must be
read from /dev/pigpio15.
D*/
/*F*/
int notify_begin(int pi, unsigned handle, uint32_t bits);
/*D
Start notifications on a previously opened handle.
. .
pi: >=0 (as returned by [*pigpio_start*]).
handle: 0-31 (as returned by [*notify_open*])
bits: a mask indicating the GPIO to be notified.
. .
Returns 0 if OK, otherwise PI_BAD_HANDLE.
The notification sends state changes for each GPIO whose
corresponding bit in bits is set.
Each notification occupies 12 bytes in the fifo as follows:
. .
typedef struct
{
uint16_t seqno;
uint16_t flags;
uint32_t tick;
uint32_t level;
} gpioReport_t;
. .
seqno: starts at 0 each time the handle is opened and then increments
by one for each report.
flags: three flags are defined, PI_NTFY_FLAGS_WDOG,
PI_NTFY_FLAGS_ALIVE, and PI_NTFY_FLAGS_EVENT.
If bit 5 is set (PI_NTFY_FLAGS_WDOG) then bits 0-4 of the flags
indicate a GPIO which has had a watchdog timeout.
If bit 6 is set (PI_NTFY_FLAGS_ALIVE) this indicates a keep alive
signal on the pipe/socket and is sent once a minute in the absence
of other notification activity.
If bit 7 is set (PI_NTFY_FLAGS_EVENT) then bits 0-4 of the flags
indicate an event which has been triggered.
tick: the number of microseconds since system boot. It wraps around
after 1h12m.
level: indicates the level of each GPIO. If bit 1<<x is set then
GPIO x is high.
D*/
/*F*/
int notify_pause(int pi, unsigned handle);
/*D
Pause notifications on a previously opened handle.
. .
pi: >=0 (as returned by [*pigpio_start*]).
handle: 0-31 (as returned by [*notify_open*])
. .
Returns 0 if OK, otherwise PI_BAD_HANDLE.
Notifications for the handle are suspended until
[*notify_begin*] is called again.
D*/
/*F*/
int notify_close(int pi, unsigned handle);
/*D
Stop notifications on a previously opened handle and
release the handle for reuse.
. .
pi: >=0 (as returned by [*pigpio_start*]).
handle: 0-31 (as returned by [*notify_open*])
. .
Returns 0 if OK, otherwise PI_BAD_HANDLE.
D*/
/*F*/
int set_watchdog(int pi, unsigned user_gpio, unsigned timeout);
/*D
Sets a watchdog for a GPIO.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31.
timeout: 0-60000.
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO
or PI_BAD_WDOG_TIMEOUT.
The watchdog is nominally in milliseconds.
Only one watchdog may be registered per GPIO.
The watchdog may be cancelled by setting timeout to 0.
Once a watchdog has been started callbacks for the GPIO will be
triggered every timeout interval after the last GPIO activity.
The callback will receive the special level PI_TIMEOUT.
D*/
/*F*/
int set_glitch_filter(int pi, unsigned user_gpio, unsigned steady);
/*D
Sets a glitch filter on a GPIO.
Level changes on the GPIO are not reported unless the level
has been stable for at least [*steady*] microseconds. The
level is then reported. Level changes of less than
[*steady*] microseconds are ignored.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31
steady: 0-300000
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, or PI_BAD_FILTER.
This filter affects the GPIO samples returned to callbacks set up
with [*callback*], [*callback_ex*] and [*wait_for_edge*].
It does not affect levels read by [*gpio_read*],
[*read_bank_1*], or [*read_bank_2*].
Each (stable) edge will be timestamped [*steady*] microseconds
after it was first detected.
D*/
/*F*/
int set_noise_filter(
int pi, unsigned user_gpio, unsigned steady, unsigned active);
/*D
Sets a noise filter on a GPIO.
Level changes on the GPIO are ignored until a level which has
been stable for [*steady*] microseconds is detected. Level changes
on the GPIO are then reported for [*active*] microseconds after
which the process repeats.
. .
pi: >=0 (as returned by [*pigpio_start*]).
user_gpio: 0-31
steady: 0-300000
active: 0-1000000
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, or PI_BAD_FILTER.
This filter affects the GPIO samples returned to callbacks set up
with [*callback*], [*callback_ex*] and [*wait_for_edge*].
It does not affect levels read by [*gpio_read*],
[*read_bank_1*], or [*read_bank_2*].
Level changes before and after the active period may
be reported. Your software must be designed to cope with
such reports.
D*/
/*F*/
uint32_t read_bank_1(int pi);
/*D
Read the levels of the bank 1 GPIO (GPIO 0-31).
. .
pi: >=0 (as returned by [*pigpio_start*]).
. .
The returned 32 bit integer has a bit set if the corresponding
GPIO is logic 1. GPIO n has bit value (1<<n).
D*/
/*F*/
uint32_t read_bank_2(int pi);
/*D
Read the levels of the bank 2 GPIO (GPIO 32-53).
. .
pi: >=0 (as returned by [*pigpio_start*]).
. .
The returned 32 bit integer has a bit set if the corresponding
GPIO is logic 1. GPIO n has bit value (1<<(n-32)).
D*/
/*F*/
int clear_bank_1(int pi, uint32_t bits);
/*D
Clears GPIO 0-31 if the corresponding bit in bits is set.
. .
pi: >=0 (as returned by [*pigpio_start*]).
bits: a bit mask with 1 set if the corresponding GPIO is
to be cleared.
. .
Returns 0 if OK, otherwise PI_SOME_PERMITTED.
A status of PI_SOME_PERMITTED indicates that the user is not
allowed to write to one or more of the GPIO.
D*/
/*F*/
int clear_bank_2(int pi, uint32_t bits);
/*D
Clears GPIO 32-53 if the corresponding bit (0-21) in bits is set.
. .
pi: >=0 (as returned by [*pigpio_start*]).
bits: a bit mask with 1 set if the corresponding GPIO is
to be cleared.
. .