pigpio/pigpiod.1

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.TH pigpiod 1 2012-2015 Linux "pigpio archive"
.SH NAME
pigpiod - A utility to start the pigpio library as a daemon.

.SH SYNOPSIS

sudo pigpiod [OPTION]...
.SH DESCRIPTION


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pigpiod is a utility which launches the pigpio library as a daemon.
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Once launched the pigpio library runs in the background accepting commands from the pipe and socket interfaces.
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The pigpiod utility requires sudo privileges to launch the library but thereafter the pipe and socket commands may be issued by normal users.
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pigpiod accepts the following configuration options
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.SH OPTIONS

.IP "\fB-a value\fP"
DMA memory allocation mode
0=AUTO, 1=PMAP, 2=MBOX
default AUTO

.IP "\fB-b value\fP"
GPIO sample buffer in milliseconds
100-10000
default 120

.IP "\fB-c value\fP"
library internal settings

default 0

.IP "\fB-d value\fP"
primary DMA channel
0-14
default 14

.IP "\fB-e value\fP"
secondary DMA channel
0-14
default 6

.IP "\fB-f\fP"
disable fifo interface

default enabled

.IP "\fB-k\fP"
disable local and remote socket interface

default enabled

.IP "\fB-l\fP"
disable remote socket interface

default enabled

.IP "\fB-p value\fP"
socket port
1024-32000
default 8888

.IP "\fB-s value\fP"
sample rate
1, 2, 4, 5, 8, 10
default 5

.IP "\fB-t value\fP"
clock peripheral
0=PWM 1=PCM
default PCM

.IP "\fB-v -V\fP"
display pigpio version and exit



.IP "\fB-x mask\fP"
GPIO which may be updated
A 54 bit mask with (1<<n) set if the user may update GPIO #n.
default is the set of user GPIO for the board revision

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.SS Example
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.EX
sudo pigpiod -s 2 -b 200 -f
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.EE

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Launch the pigpio library with a sample rate of 2 microseconds and a 200 millisecond buffer.  Disable the fifo interface.

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.SS Permissions
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pigpio provides a rudimentary permissions system for commands issued via the socket and pipe interfaces.

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All GPIO may be read.

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Only the user GPIO for the board type or those specified by the -x option may be updated.

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.EX
Type 1 boards 0x03E6CF93 (26 pin header)
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Type 2 boards 0xFBC6CF9C (26 pin + 8 pin header)
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Type 3 boards 0x0FFFFFFC (40 pin header)
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.EE

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In this context an update includes the following:

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GPIO mode set
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GPIO pull/up down
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GPIO write
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GPIO set PWM (including range and frequency)
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GPIO set servo

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In addition the bank clear and set commands, and the wave commands will only
affect updateable GPIO.

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.SS Exceptions
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The following exceptions are made for particular models.

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.SS Models A and B
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The green activity LED (GPIO 16) may be written.
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.SS Models A+ and B+
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The green activity LED (GPIO 47) may be written.
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The red power LED (GPIO 35) may be written.
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The high USB power mode (GPIO 38) may be written.
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.SS Pi Zero
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The green activity LED (GPIO 47) may be written.
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.SS Pi2B
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The green activity LED (GPIO 47) may be written.
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The red power LED (GPIO 35) may be written.
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The high USB power mode (GPIO 38) may be written.
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.SS Pi3B
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The green activity LED and the red power LED are not writable.
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The USB power mode is fixed at 1.2 amps (high power).
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.SS DMA Channels
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The secondary channel is only used for the transmission of waves.

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If possible use one of channels 0 to 6 for the secondary channel (a full channel).

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A full channel only requires one DMA control block regardless of the length of a pulse delay.  Channels 7 to 14 (lite channels) require one DMA control block for each 16383 microseconds of delay.  I.e. a 10 second pulse delay requires one control block on a full channel and 611 control blocks on a lite channel.

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.SH SEE ALSO

pig2vcd(1), pigs(1), pigpio(3), pigpiod_if(3), pigpiod_if2(3)
.SH AUTHOR

joan@abyz.co.uk