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.TH pigpiod 1 2012-2014 Linux "pigpio archive"
.SH NAME
pigpiod - A utility to start the pigpio library as a daemon.

.SH SYNOPSIS

sudo pigpiod [OPTION]...
.SH DESCRIPTION

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-b value\fP"
gpio sample buffer in milliseconds
100-10000
default 120

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

.IP "\fB-e value\fP"
secondary DMA channel
0-6
default 5

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

default enabled

.IP "\fB-k\fP"
disable 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-x mask\fP"
gpios 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 gpios 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 gpios may be read.

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Only the default gpios for the board revision or those specified by the -x option may be updated.

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.EX
Revision 1 boards 0x03E6CF93
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Revision 2 boards 0xFBC6CF9C
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Revision 3 boards 0x0FFFFFFC
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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 gpios.

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There are two special cases.

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The activity LED may be written (gpio 16 for Rev.1/2
boards, gpio 47 for Rev.3 boards).

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The high USB power mode gpio may be written (gpio 38 for Rev.3 boards).

.SH SEE ALSO

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

joan@abyz.co.uk