." Process this file with ." groff -man -Tascii foo.1 ." .TH pigs 1 2012-2014 Linux "pigpio archive" .SH NAME pigs - command line socket access to the pigpio daemon. /dev/pigpio - command line pipe access to the pigpio daemon. .SH SYNOPSIS .B sudo pigpiod then .B pigs {command}+ or .B "echo {command}+ >/dev/pigpio" .SH DESCRIPTION .br The socket and pipe interfaces allow control of the gpios by passing messages to the running pigpio library. .br The normal way to start the pigpio library would be as a daemon during boot. .br .EX sudo pigpiod .br .EE .br pigs is a program and internally uses the socket interface to pigpio whereas /dev/pigpio uses the pipe interface. .br .SS Features .br o PWM on any of gpios 0-31 .br o servo pulses on any of gpios 0-31 .br o reading/writing all of the gpios in a bank as one operation .br o individually setting gpio modes, reading and writing .br o notifications when any of gpios 0-31 change state .br o the construction of output waveforms with microsecond timing .br o I2C, SPI, and serial link wrappers .br o creating and running scripts on the pigpio daemon .br .SS gpios .br ALL gpios are identified by their Broadcom number. .br .SS Usage .br pigs and the socket interface share the same commands and are invoked in a similar fashion from the command line. .br The pigpio library must be running, either by running a program linked with the library or starting the pigpio daemon (sudo pigpiod). .br pigs {command}+ .br echo "{command}+" >/dev/pigpio .br pigs will show the result of the command on screen. .br The results of /dev/pigpio commands need to be read from /dev/pigout, e.g. cat /dev/pigout (try cat /dev/pigout& so that all subsequent results are shown on screen). .br In both cases if an error was detected a message will have been written to /dev/pigerr (try cat /dev/pigerr&). This is likely to be more informative than the message returned by pigs or the error code returned by the pipe interface. .br Several commands may be entered on a line. If present PROC and PARSE must be the last command on a line. .br E.g. .br .EX pigs w 22 1 mils 1000 w 22 0 .br .EE .br is equivalent to .br .EX pigs w 22 1 .br pigs mils 1000 .br pigs w 22 0 .br .EE .br and .br .EX echo "m 4 w w 4 0 mils 250 m 4 r r 4" >/dev/pigpio .br .EE .br is equivalent to .br .EX echo "m 4 w" >/dev/pigpio .br echo "w 4 0" >/dev/pigpio .br echo "mils 250" >/dev/pigpio .br echo "m 4 r" >/dev/pigpio .br echo "r 4" >/dev/pigpio .br .EE .br .SS Notes .br The examples from now on will show the pigs interface but the same commands will also work on the pipe interface. .br pigs does not show the status of successful commands unless the command itself returns data. The status (0) will be returned to pigs but will be discarded. .br The status/data of each command sent to the pipe interface should be read from /dev/pigout. .br When a command takes a number as a parameter it may be entered as hex (precede by 0x), octal (precede by 0), or decimal. .br E.g. 23 is 23 decimal, 0x100 is 256 decimal, 070 is 56 decimal. .br .SH COMMANDS .br .IP "\fBBC1 bits\fP - Clear specified gpios in bank 1" .IP "" 4 This command clears (sets low) the gpios specified by \fBbits\fP in bank 1. Bank 1 consists of gpios 0-31. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs bc1 0x400010 # clear gpios 4 (1<<4) and 22 (1<<22) .br .br $ pigs bc1 32 # clear gpio 5 (1<<5) .br -42 .br ERROR: no permission to update one or more gpios .br .EE .br .IP "\fBBC2 bits\fP - Clear specified gpios in bank 2" .IP "" 4 This command clears (sets low) the gpios specified by \fBbits\fP in bank 2. Bank 2 consists of gpios 32-53. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs bc2 0x8000 # clear gpio 47 (activity LED on B+) .br .br $ pigs bc2 1 # clear gpio 32 (first in bank 2) .br -42 .br ERROR: no permission to update one or more gpios .br .EE .br .IP "\fBBR1 \fP - Read bank 1 gpios" .IP "" 4 This command read gpios 0-31 (bank 1) and returns the levels as a 32-bit hexadecimal value. .br \fBExample\fP .br .EX $ pigs br1 .br 1001C1CF .br .EE .br .IP "\fBBR2 \fP - Read bank 2 gpios" .IP "" 4 This command read gpios 32-53 (bank 2) and returns the levels as a 32-bit hexadecimal value. .br \fBExample\fP .br .EX $ pigs br2 .br 003F0000 .br .EE .br .IP "\fBBS1 bits\fP - Set specified gpios in bank 1" .IP "" 4 This command sets (sets high) the gpios specified by \fBbits\fP in bank 1. Bank 1 consists of gpios 0-31. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs bs1 16 # set gpio 4 (1<<4) .br .br $ pigs bs1 1 # set gpio 1 (1<<0) .br -42 .br ERROR: no permission to update one or more gpios .br .EE .br .IP "\fBBS2 bits\fP - Set specified gpios in bank 2" .IP "" 4 This command sets (sets high) the gpios specified by \fBbits\fP in bank 2. Bank 2 consists of gpios 32-53. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs bs2 0x40 # set gpio 38 (enable high current mode B+) .br .br $ pigs bs2 1 # set gpio 32 (first in bank 2) .br -42 .br ERROR: no permission to update one or more gpios .br .EE .br .IP "\fBH/HELP \fP - Display command help" .IP "" 4 This command displays a brief list of the commands and their parameters. .br \fBExample\fP .br .EX $ pigs h .br .br $ pigs help .br .EE .br .IP "\fBHWVER \fP - Get hardware version" .IP "" 4 This command returns the hardware revision of the Pi. .br The hardware revision is found in the last 4 characters on the Revision line of /proc/cpuinfo. .br If the hardware revision can not be found or is not a valid hexadecimal number the command returns 0. .br The revision number can be used to determine the assignment of gpios to pins. .br There are currently three types of board. .br Type 1 has gpio 0 on P1-3, gpio 1 on P1-5, and gpio 21 on P1-13. .br Type 2 has gpio 2 on P1-3, gpio 3 on P1-5, gpio 27 on P1-13, and gpios 28-31 on P5. .br Type 3 has a 40 pin connector rather than the 26 pin connector of the earlier boards. Gpios 0 to 27 are brought out to the connector (although gpios 0 and 1 are reserved). .br Type 1 boards have hardware revision numbers of 2 and 3. .br Type 2 boards have hardware revision numbers of 4, 5, 6, and 15. .br Type 3 boards have hardware revision number 16. .br for "Revision : 0002" the command returns 2. .br for "Revision : 000f" the command returns 15. .br for "Revision : 000g" the command returns 0. .br \fBExample\fP .br .EX $ pigs hwver # On a B+ .br 16 .br .EE .br .IP "\fBI2CC h\fP - Close I2C handle" .IP "" 4 This command closes an I2C handle \fBh\fP previously opened with \fBI2CO\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cc 0 # First close okay. .br .br $ pigs i2cc 0 # Second fails. .br -25 .br ERROR: unknown handle .br .EE .br .IP "\fBI2CO ib id if\fP - Open I2C bus and device with flags" .IP "" 4 This command returns a handle to access device \fBid\fP on I2C bus \fBib\fP. The device is opened with flags \fBif\fP. .br No flags are currently defined. The parameter \fBif\fP should be 0. .br Upon success the next free handle (>=0) is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2co 1 0x70 0 # Bus 1, device 0x70, flags 0. .br 0 .br .br $ pigs i2co 1 0x53 0 # Bus 1, device 0x53, flags 0. .br 1 .br .EE .br .IP "\fBI2CPC h r wv\fP - smb Process Call: exchange register with word" .IP "" 4 This command writes \fBwv\fP to register \fBr\fP of the I2C device associated with handle \fBh\fP and returns a 16-bit word read from the device. .br Upon success a value between 0 and 65535 will be returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cpc 0 37 43210 .br 39933 .br .br $ pigs i2cpc 0 256 43210 .br ERROR: bad i2c/spi/ser parameter .br -81 .br .EE .br .IP "\fBI2CPK h r bvs\fP - smb Block Process Call: exchange data bytes with register" .IP "" 4 .br This command writes the data bytes \fBbvs\fP to register \fBr\fP of the I2C device associated with handle \fBh\fP and returns a device specific number of bytes. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cpk 0 0 0x11 0x12 .br 6 0 0 0 0 0 0 .br .EE .br .IP "\fBI2CRB h r\fP - smb Read Byte Data: read byte from register" .IP "" 4 .br This command returns a single byte read from register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success a value between 0 and 255 will be returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2crb 0 0 .br 6 .br .EE .br .IP "\fBI2CRD h num\fP - i2c Read bytes" .IP "" 4 .br This command returns \fBnum\fP bytes read from the I2C device associated with handle \fBh\fP. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br This command operates on the raw I2C device. The maximum value of the parameter \fBnum\fP is dependent on the I2C drivers and the device itself. pigs imposes a limit of about 8000 bytes. .br \fBExample\fP .br .EX $ pigs i2crd 0 16 .br 16 6 24 0 0 0 0 0 0 0 0 0 0 0 0 32 78 .br .EE .br .IP "\fBI2CRI h r num\fP - smb Read I2C Block Data: read bytes from register" .IP "" 4 .br This command returns \fBnum\fP bytes from register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br The parameter \fBnum\fP may be 1-32. .br \fBExample\fP .br .EX $ pigs i2cri 0 0 16 .br 16 237 155 155 155 155 155 155 155 155 155 155 155 155 155 155 155 .br .EE .br .IP "\fBI2CRK h r\fP - smb Read Block Data: read data from register" .IP "" 4 .br This command returns between 1 and 32 bytes read from register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br The number of bytes of returned data is specific to the device and register. .br \fBExample\fP .br .EX $ pigs i2crk 0 0 .br 6 0 0 0 0 0 0 .br .br $ pigs i2crk 0 1 .br 24 0 0 0 0 0 0 0 0 0 0 0 0 120 222 105 215 128 87 195 217 0 0 0 0 .br .EE .br .IP "\fBI2CRS h\fP - smb Read Byte: read byte" .IP "" 4 .br This command returns a single byte read from the I2C device associated with handle \fBh\fP. .br Upon success a value between 0 and 255 will be returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2crs 0 .br 0 .br .EE .br .IP "\fBI2CRW h r\fP - smb Read Word Data: read word from register" .IP "" 4 .br This command returns a single 16 bit word read from register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success a value between 0 and 65535 will be returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2crw 0 0 .br 6150 .br .EE .br .IP "\fBI2CWB h r bv\fP - smb Write Byte Data: write byte to register" .IP "" 4 .br This command writes a single byte \fBbv\fP to register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cwb 0 10 0x54 .br .EE .br .IP "\fBI2CWD h bvs\fP - i2c Write data" .IP "" 4 .br This command writes a block of bytes \fBbvs\fP to the I2C device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br The number of bytes which may be written in one transaction is dependent on the I2C drivers and the device itself. pigs imposes a limit of about 500 bytes. .br This command operates on the raw I2C device. .br \fBExample\fP .br .EX $ pigs i2cwd 0 0x01 0x02 0x03 0x04 .br .EE .br .IP "\fBI2CWI h r bvs\fP - smb Write I2C Block Data" .IP "" 4 .br This command writes between 1 and 32 bytes \fBbvs\fP to register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cwi 0 4 0x01 0x04 0xc0 .br .EE .br .IP "\fBI2CWK h r bvs\fP - smb Write Block Data: write data to register" .IP "" 4 .br This command writes between 1 and 32 bytes \fBbvs\fP to register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX pigs i2cwk 0 4 0x01 0x04 0xc0 .br .EE .br .IP "\fBI2CWQ h bit\fP - smb Write Quick: write bit" .IP "" 4 .br This command writes a single \fBbit\fP to the I2C device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cwq 0 1 .br .EE .br .IP "\fBI2CWS h bv\fP - smb Write Byte: write byte" .IP "" 4 .br This command writes a single byte \fBbv\fP to the I2C device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cws 0 0x12 .br .br $ pigs i2cws 0 0xff .br -82 .br ERROR: I2C write failed .br .EE .br .IP "\fBI2CWW h r wv\fP - smb Write Word Data: write word to register" .IP "" 4 .br This command writes a single 16 bit word \fBwv\fP to register \fBr\fP of the I2C device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs i2cww 0 0 0xffff .br .EE .br .IP "\fBM/MODES g m\fP - Set gpio mode" .IP "" 4 .br This command sets gpio \fBg\fP to mode \fBm\fP, typically input (read) or output (write). .br Upon success nothing is returned. On error a negative status code will be returned. .br Each gpio can be configured to be in one of 8 different modes. The modes are named Input, Output, ALT0, ALT1, ALT2, ALT3, ALT4, and ALT5. .br To set the mode use the code for the mode. .br .EX Mode Input Output ALT0 ALT1 ALT2 ALT3 ALT4 ALT5 Code R W 0 1 2 3 4 5 .EE .br \fBExample\fP .br .EX $ pigs m 4 r # Input (read) .br $ pigs m 4 w # Output (write) .br $ pigs m 4 0 # ALT 0 .br $ pigs m 4 5 # ALT 5 .br .EE .br .IP "\fBMG/MODEG g\fP - Get gpio mode" .IP "" 4 .br This command returns the current mode of gpio \fBg\fP. .br Upon success the value of the gpio mode is returned. On error a negative status code will be returned. .br .EX Value 0 1 2 3 4 5 6 7 Mode Input Output ALT5 ALT4 ALT0 ALT1 ALT2 ALT3 .EE .br \fBExample\fP .br .EX $ pigs mg 4 .br 1 .br .EE .br .IP "\fBMICS v\fP - Microseconds delay" .IP "" 4 This command delays execution for \fBv\fP microseconds. .br Upon success nothing is returned. On error a negative status code will be returned. .br The main use of this command is expected to be within \fBScripts\fP. .br \fBExample\fP .br .EX $ pigs mics 20 # Delay 20 microseconds. .br $ pigs mics 1000000 # Delay 1 second. .br .br $ pigs mics 2000000 .br -64 .br ERROR: bad MICS delay (too large) .br .EE .br .IP "\fBMILS v\fP - Milliseconds delay" .IP "" 4 .br This command delays execution for \fBv\fP milliseconds. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs mils 2000 # Delay 2 seconds. .br .br $ pigs mils 61000 .br -65 .br ERROR: bad MILS delay (too large) .br .EE .br .IP "\fBNB h bits\fP - Start notification" .IP "" 4 .br This command starts notifications on handle \fBh\fP returned by a prior call to \fBNO\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br The notification gets state changes for each gpio specified by \fBbits\fP. .br \fBExample\fP .br .EX $ pigs nb 0 -1 # Shorthand for gpios 0-31. .br $ pigs nb 0 0xf0 # Get notifications for gpios 4-7. .br .br $ pigs nb 1 0xf .br -25 .br ERROR: unknown handle .br .EE .br .IP "\fBNC h\fP - Close notification" .IP "" 4 .br This command stops notifications on handle \fBh\fP returned by a prior call to \fBNO\fP and releases the handle for reuse. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs nc 0 # First call succeeds. .br .br $ pigs nc 1 # Second call fails. .br -25 .br ERROR: unknown handle .br .EE .br .IP "\fBNO \fP - Request a notification" .IP "" 4 .br This command requests a free notification handle. .br A notification is a method for being notified of gpio state changes via a pipe. .br Upon success the command returns a handle greater than or equal to zero. On error a negative status code will be returned. .br Notifications for handle x will be available at the pipe named /dev/pigpiox (where x is the handle number). .br E.g. if the command returns 15 then the notifications must be read from /dev/pigpio15. .br \fBExample\fP .br .EX $ pigs no .br 0 .br .EE .br .IP "\fBNP h\fP - Pause notification" .IP "" 4 .br This command pauses notifications on handle \fBh\fP returned by a prior call to \fBNO\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br Notifications for the handle are suspended until a new \fBNB\fP command is given for the handle. .br \fBExample\fP .br .EX $ pigs np 0 .br .EE .br .IP "\fBP/PWM u v\fP - Set gpio PWM value" .IP "" 4 .br This command starts PWM on gpio \fBu\fP with duty cycle \fBv\fP. The duty cycle varies from 0 (off) to range (fully on). The range defaults to 255. .br Upon success nothing is returned. On error a negative status code will be returned. .br This and the servo functionality use the DMA and PWM or PCM peripherals to control and schedule the pulse lengths and duty cycles. .br The \fBPRS\fP command may be used to change the default range of 255. .br \fBExample\fP .br .EX $ pigs p 4 64 # Start PWM on gpio 4 with 25% dutycycle .br $ pigs p 4 128 # 50% .br $ pigs p 4 192 # 75% .br $ pigs p 4 255 # 100% .br .EE .br .IP "\fBPARSE t\fP - Validate script" .IP "" 4 .br Validates the text \fBt\fP of a script without storing the script. .br Upon success nothing is returned. On error a list of detected script errors will be given. .br See \fBScripts\fP. .br This command may be used to find script syntax faults. .br \fBExample\fP .br .EX $ pigs parse tag 100 w 22 1 mils 200 w 22 0 mils 800 jmp 100 .br .br $ pigs parse tag 0 w 22 1 mills 50 w 22 0 dcr p10 jp 99 .br Unknown command: mills .br Unknown command: 50 .br Bad parameter to dcr .br Can't resolve tag 99 .br .EE .br .IP "\fBPFG u\fP - Get gpio PWM frequency" .IP "" 4 .br This command returns the PWM frequency in Hz used for gpio \fBu\fP. .br Upon success the PWM frequency is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs pfg 4 .br 800 .br .br pigs pfg 34 .br ERROR: gpio not 0-31 .br -2 .br .EE .br .IP "\fBPFS u v\fP - Set gpio PWM frequency" .IP "" 4 This command sets the PWM frequency \fBv\fP to be used for gpio \fBu\fP. .br The numerically closest frequency to \fBv\fP will be selected. .br Upon success the new frequency is returned. On error a negative status code will be returned. .br The selectable frequencies depend upon the sample rate with which the pigpiod daemon was started. The sample rate is one of 1, 2, 4, 5, 8, or 10 microseconds (default 5). .br Each gpio can be independently set to one of 18 different PWM frequencies. .br If PWM is currently active on the gpio it will be switched off and then back on at the new frequency. .br The frequencies for each sample rate are: .br .EX #1 #2 #3 #4 #5 #6 #7 #8 #9 1us 40000 20000 10000 8000 5000 4000 2500 2000 1600 2us 20000 10000 5000 4000 2500 2000 1250 1000 800 4us 10000 5000 2500 2000 1250 1000 625 500 400 5us 8000 4000 2000 1600 1000 800 500 400 320 8us 5000 2500 1250 1000 625 500 313 250 200 10us 4000 2000 1000 800 500 400 250 200 160 .br #10 #11 #12 #13 #14 #15 #16 #17 #18 1us 1250 1000 800 500 400 250 200 100 50 2us 625 500 400 250 200 125 100 50 25 4us 313 250 200 125 100 63 50 25 13 5us 250 200 160 100 80 50 40 20 10 8us 156 125 100 63 50 31 25 13 6 10us 125 100 80 50 40 25 20 10 5 .EE .br \fBExample\fP .br .EX pigs pfs 4 0 # 0 selects the lowest frequency. .br 10 .br .br $ pigs pfs 4 1000 # Set 1000Hz PWM. .br 1000 .br .br $ pigs pfs 4 100000 # Very big number selects the highest frequency. .br 8000 .br .EE .br .IP "\fBPIGPV \fP - Get pigpio library version" .IP "" 4 .br This command returns the pigpio library version. .br \fBExample\fP .br .EX $ pigs pigpv .br 17 .br .EE .br .IP "\fBPRG u\fP - Get gpio PWM range" .IP "" 4 .br This command returns the dutycycle range for gpio \fBu\fP. .br Upon success the range is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs prg 4 .br 255 .br .EE .br .IP "\fBPROC t\fP - Store script" .IP "" 4 .br This command stores a script \fBt\fP for later execution. .br If the script is valid a script id (>=0) is returned which is passed to the other script commands. On error a negative status code will be returned. .br See \fBScripts\fP. .br \fBExample\fP .br .EX $ pigs proc tag 123 w 4 0 mils 200 w 4 1 mils 300 dcr p0 jp 123 .br 0 .br .br $ pigs proc tag 123 w 4 0 mils 5 w 4 1 mils 5 jmp 12 .br ERROR: script has unresolved tag .br -63 .br .EE .br .IP "\fBPROCD sid\fP - Delete script" .IP "" 4 .br This command deletes script \fBsid\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br See \fBScripts\fP. .br \fBExample\fP .br .EX $ pigs procd 1 .br .br $ pigs procd 1 .br ERROR: unknown script id .br -48 .br .EE .br .IP "\fBPROCP sid\fP - Get script status and parameters" .IP "" 4 .br This command returns the status of script \fBsid\fP as well as the current value of its 10 parameters. .br Upon success the script status and parameters are returned. On error a negative status code will be returned. .br The script status may be one of .br .EX 0 being initialised 1 halted 2 running 3 waiting 4 failed .EE .br See \fBScripts\fP. .br \fBExample\fP .br .EX $ pigs procp 0 .br 1 0 0 0 0 0 0 0 0 0 0 .br .EE .br .IP "\fBPROCR sid pars\fP - Run script" .IP "" 4 .br This command runs stored script \fBsid\fP passing it up to 10 optional parameters. .br Upon success nothing is returned. On error a negative status code will be returned. .br See \fBScripts\fP. .br \fBExample\fP .br .EX $ pigs proc tag 123 w 4 0 mils 200 w 4 1 mils 300 dcr p0 jp 123 .br 0 .br .br $ pigs procr 0 50 # Run script 0 with parameter 0 of 50. .br .br $ pigs procp 0 .br 2 44 0 0 0 0 0 0 0 0 0 .br $ pigs procp 0 .br 2 37 0 0 0 0 0 0 0 0 0 .br $ pigs procp 0 .br 2 10 0 0 0 0 0 0 0 0 0 .br $ pigs procp 0 .br 2 5 0 0 0 0 0 0 0 0 0 .br $ pigs procp 0 .br 2 2 0 0 0 0 0 0 0 0 0 .br $ pigs procp 0 .br 1 -1 0 0 0 0 0 0 0 0 0 .br .EE .br .IP "\fBPROCS sid\fP - Stop script" .IP "" 4 .br This command stops a running script \fBsid\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br See \fBScripts\fP. .br \fBExample\fP .br .EX $ pigs procs 0 .br .br $ pigs procs 1 .br -48 .br ERROR: unknown script id .br .EE .br .IP "\fBPRRG u\fP - Get gpio PWM real range" .IP "" 4 .br This command returns the real underlying range used by gpio \fBu\fP. .br Upon success the real range is returned. On error a negative status code will be returned. .br See \fBPRS\fP. .br \fBExample\fP .br .EX $ pigs prrg 17 .br 250 .br .br $ pigs pfs 17 0 .br 10 .br $ pigs prrg 17 .br 20000 .br .br $ pigs pfs 17 100000 .br 8000 .br $ pigs prrg 17 .br 25 .br .EE .br .IP "\fBPRS u v\fP - Set gpio PWM range" .IP "" 4 .br This command sets the dutycycle range \fBv\fP to be used for gpio \fBu\fP. Subsequent uses of command \fBP/PWM\fP will use a dutycycle between 0 (off) and \fBv\fP (fully on). .br Upon success the real underlying range used by the gpio is returned. On error a negative status code will be returned. .br If PWM is currently active on the gpio its dutycycle will be scaled to reflect the new range. .br The real range, the number of steps between fully off and fully on for each frequency, is given in the following table. .br .EX #1 #2 #3 #4 #5 #6 #7 #8 #9 25 50 100 125 200 250 400 500 625 #10 #11 #12 #13 #14 #15 #16 #17 #18 800 1000 1250 2000 2500 4000 5000 10000 20000 .EE .br The real value set by \fBPRS\fP is (dutycycle * real range) / range. .br See \fBPRRG\fP .br \fBExample\fP .br .EX $ pigs prs 18 1000 .br 250 .br .EE .br .IP "\fBPUD g p\fP - Set gpio pull up/down" .IP "" 4 .br This command sets the internal pull/up down for gpio \fBg\fP to mode \fBp\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br The mode may be pull-down (D), pull-up (U), or off (O). .br \fBExample\fP .br .EX $ pigs pud 4 d # Set pull-down on gpio 4. .br $ pigs pud 4 u # Set pull-up on gpio 4. .br $ pigs pud 4 o # No pull-up/down on gpio 4. .br .EE .br .IP "\fBR/READ g\fP - Read gpio level" .IP "" 4 .br This reads the current level of gpio \fBg\fP. .br Upon success the current level is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs r 17 # Get level of gpio 17. .br 0 .br .br $ pigs r 4 # Get level of gpio 4. .br 1 .br .EE .br .IP "\fBS/SERVO u v\fP - Set gpio servo pulsewidth" .IP "" 4 .br This command starts servo pulses of \fBv\fP microseconds on gpio \fBu\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br The servo pulse width may be 0 (off), 500 (most anti-clockwise) to 2500 (most clockwise). .br The range supported by servos varies and should probably be determined by experiment. Generally values between 1000-2000 should be safe. A value of 1500 should always be safe and represents the mid-point of rotation. .br You can DAMAGE a servo if you command it to move beyond its limits. .br \fBExample\fP .br .EX $ pigs SERVO 17 1500 .br .EE .br This example causes an on pulse of 1500 microseconds duration to be transmitted on gpio 17 at a rate of 50 times per second. .br This will command a servo connected to gpio 17 to rotate to its mid-point. .br \fBExample\fP .br .EX pigs s 17 0 # Switch servo pulses off. .br .EE .br .IP "\fBSERC h\fP - Close serial handle" .IP "" 4 .br This command closes a serial handle \fBh\fP previously opened with \fBSERO\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs serc 0 # First close okay. .br .br $ pigs serc 0 # Second close gives error. .br -25 .br ERROR: unknown handle .br .EE .br .IP "\fBSERDA h\fP - Check for serial data ready to read" .IP "" 4 .br This command returns the number of bytes of data available to be read from the serial device associated with handle \fBh\fP. .br Upon success the count of bytes available to be read is returned (which may be 0). On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs serda 0 .br 0 .br .EE .br .IP "\fBSERO dev b sef\fP - Open serial device dev at baud with flags" .IP "" 4 .br This command opens the serial \fBdev\fP at \fBb\fP bits per second. .br No flags are currently defined. \fBsef\fP should be set to zero. .br Upon success a handle (>=0) is returned. On error a negative status code will be returned. .br The UART is /dev/ttyAMA0. The consoles are /dev/ttyx. The USB devices are /dev/ttyUSBx. .br \fBExample\fP .br .EX $ pigs sero /dev/ttyAMA0 9600 0 .br 0 .br .br $ pigs sero /dev/tty1 38400 0 .br 1 .br .EE .br .IP "\fBSERR h num\fP - Read bytes from serial handle" .IP "" 4 .br This command returns up to \fBnum\fP bytes of data read from the serial device associated with handle \fBh\fP. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs serr 0 10 .br 5 48 49 128 144 255 .br .br $ pigs serr 0 10 .br 0 .br .EE .br .IP "\fBSERRB \fP - Read byte from serial handle" .IP "" 4 .br This command returns a byte of data read from the serial device associated with handle \fBh\fP. .br Upon success a number between 0 and 255 is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs serrb 0 .br 23 .br $ pigs serrb 0 .br 45 .br .EE .br .IP "\fBSERW h bvs\fP - Write bytes to serial handle" .IP "" 4 .br This command writes bytes \fBbvs\fP to the serial device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs serw 0 23 45 67 89 .br .EE .br .IP "\fBSERWB h bv\fP - Write byte to serial handle" .IP "" 4 .br This command writes a single byte \fBbv\fP to the serial device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs serwb 0 23 .br $ pigs serwb 0 0xf0 .br .EE .br .IP "\fBSLR u num\fP - Read bit bang serial data from gpio" .IP "" 4 .br This command returns up to \fBnum\fP bytes of bit bang serial data read from gpio \fBu\fP. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br The gpio \fBu\fP should have been initialised with the \fBSLRO\fP command. .br \fBExample\fP .br .EX $ pigs slr 15 20 .br 6 1 0 23 45 89 0 .br .EE .br .IP "\fBSLRC u\fP - Close gpio for bit bang serial data" .IP "" 4 .br This command closes gpio \fBu\fP for reading bit bang serial data. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs slrc 23 .br .br $ pigs slrc 23 .br -38 .br ERROR: no serial read in progress on gpio .br .EE .br .IP "\fBSLRO u b\fP - Open gpio for bit bang serial data" .IP "" 4 .br This command opens gpio \fBu\fP for reading bit bang serial data at \fBb\fP baud. .br Upon success nothing is returned. On error a negative status code will be returned. .br The received data is held in a cyclic buffer. .br It is the user's responsibility to read the data (with \fBSLR\fP) in a timely fashion. .br \fBExample\fP .br .EX $ pigs slro 23 19200 .br .br $ pigs slro 23 19200 .br -50 .br ERROR: gpio already in use .br .EE .br .IP "\fBSPIC h\fP - SPI close handle" .IP "" 4 .br This command closes the SPI handle \fBh\fP returned by a prior call to \fBSPIO\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br .IP "\fBSPIO c b spf\fP - SPI open channel at baud with flags" .IP "" 4 .br This command returns a handle to a SPI device on channel \fBc\fP. .br .br Data will be transferred at \fBb\fP bits per second. The flags \fBspf\fP may be used to modify the default behaviour of 4-wire operation, mode 0, active low chip select. .br The flags consists of the least significant 8 bits. .br .EX 7 6 5 4 3 2 1 0 .br n n n n W P m m .br .EE .br mm defines the SPI mode. .br .EX Mode POL PHA .br 0 0 0 .br 1 0 1 .br 2 1 0 .br 3 1 1 .br .EE .br P is 0 for active low chip select (normal) and 1 for active high. .br W is 0 if the device is not 3-wire, 1 if the device is 3-wire. .br nnnn defines the number of bytes (0-15) to write before switching the MOSI line to MISO to read data. This field is ignored if W is not set. .br The other bits in flags should be set to zero. .br Upon success a handle (>=0) is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs spio 0 100000 3 # Open channel 0 at 100kbps in mode 3. .br 0 .br .EE .br .IP "\fBSPIR h num\fP - SPI read bytes from handle" .IP "" 4 .br This command returns \fBnum\fP bytes read from the SPI device associated with handle \fBh\fP. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs spir 0 10 # Read 10 bytes from the SPI device. .br 10 0 0 0 0 0 0 0 0 0 0 .br .EE .br .IP "\fBSPIW h bvs\fP - SPI write bytes to handle" .IP "" 4 .br This command writes bytes \fBbvs\fP to the SPI device associated with handle \fBh\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs spiw 0 0x22 0x33 0xcc 0xff .br .EE .br .IP "\fBSPIX h bvs\fP - SPI transfer bytes to handle" .IP "" 4 .br This command writes bytes \fBbvs\fP to the SPI device associated with handle \fBh\fP. It returns the same number of bytes read from the device. .br Upon success the count of returned bytes followed by the bytes themselves is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs spix 0 0x22 0x33 0xcc 0xff .br 4 0 0 0 0 .br .EE .br .IP "\fBT/TICK \fP - Get current tick" .IP "" 4 .br This command returns the current system tick. .br Tick is the number of microseconds since system boot. .br As tick is an unsigned 32 bit quantity it wraps around after 2^32 microseconds, which is approximately 1 hour 12 minutes. .br \fBExample\fP .br .EX $ pigs t mils 1000 t .br 3691823946 .br 3692833987 .br .EE .br .IP "\fBTRIG u pl L\fP - Send a trigger pulse" .IP "" 4 .br This command sends a trigger pulse of \fBpl\fP microseconds at level \fBL\fP to gpio \fBu\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br The gpio is set to not level at the end of the pulse. .br \fBExample\fP .br .EX $ pigs trig 4 10 1 .br .br $ pigs trig 4 51 1 .br -46 .br ERROR: trigger pulse > 50 microseconds .br .EE .br .IP "\fBW/WRITE g L\fP - Write gpio level" .IP "" 4 .br This command sets gpio \fBg\fP to level \fBL\fP. The level may be 0 (low, off, clear) or 1 (high, on, set). .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs w 23 0 .br $ pigs w 23 1 .br .br $ pigs w 23 2 .br -5 .br ERROR: level not 0-1 .br .EE .br .IP "\fBWDOG u v\fP - Set gpio watchdog" .IP "" 4 .br This command sets a watchdog of \fBv\fP milliseconds on gpio \fBu\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br The watchdog is nominally in milliseconds. .br One watchdog may be registered per gpio. .br The watchdog may be cancelled by setting timeout to 0. .br If no level change has been detected for the gpio for timeout milliseconds:- .br any notification for the gpio has a report written to the fifo with the flags set to indicate a watchdog timeout. .br \fBExample\fP .br .EX $ pigs wdog 23 90000 .br -15 .br ERROR: timeout not 0-60000 .br .br $ pigs wdog 23 9000 .br .EE .br This example causes a report to be written to any notification pipes listening on gpio 23 whenever gpio 23 changes state or approximately every 9000 ms. .br .IP "\fBWVAG trips\fP - Add generic pulses to waveform" .IP "" 4 .br This command adds 1 one or more triplets \fBtrips\fP of gpios on, gpios off, delay to the existing waveform (if any). .br Upon success the total number of pulses in the waveform so far is returned. On error a negative status code will be returned. .br The triplets will be added at the start of the existing waveform. If they are to start offset from the start then the first triplet should consist solely of a delay i.e. 0 0 offset. .br \fBExample\fP .br .EX $ pigs wvag 0x10 0x80 1000 0x80 0x10 9000 .br 2 .br .br $ pigs wvag 0 0 10000 0x10 0x80 1000 0x80 0x10 9000 .br 4 .br .EE .br .IP "\fBWVAS u b o bvs\fP - Add serial data to waveform" .IP "" 4 .br This command adds a waveform representing serial data \fBbvs\fP to gpio \fBu\fP at \fBb\fP baud to the existing waveform (if any). The serial data starts \fBo\fP microseconds from the start of the waveform. .br Upon success the total number of pulses in the waveform so far is returned. On error a negative status code will be returned. .br Data with different baud rates may be added to the same wavefrom. .br \fBExample\fP .br .EX $ pigs wvas 4 9600 0 0x30 0x31 0x32 0x33 .br 23 .br .br $ pigs wvas 7 38400 0 0x41 0x42 .br 35 .br .EE .br .IP "\fBWVBSY \fP - Check if waveform is being transmitted" .IP "" 4 .br This command checks to see if a waveform is currently being transmitted. .br Returns 1 if a waveform is currently being transmitted, otherwise 0. .br \fBExample\fP .br .EX $ pigs wvbsy .br 0 .br .EE .br .IP "\fBWVCLR \fP - Clear all waveforms" .IP "" 4 .br This command clears all waveforms. .br Nothing is returned. .br \fBExample\fP .br .EX $ pigs wvclr .br .EE .br .IP "\fBWVCRE \fP - Create a waveform" .IP "" 4 .br This command creates a waveform from the data provided by the prior calls to the \fBWVAG\fP and \fBWVAS\fP commands. .br Upon success a wave id (>=0) is returned. On error a negative status code will be returned. .br The data provided by the \fBWVAG\fP and \fBWVAS\fP commands is consumed by this command. .br As many waveforms may be created as there is space available. The wave id is passed to \fBWVTX\fP or \fBWVTXR\fP to specify the waveform to transmit. .br Normal usage would be .br Step 1. \fBWVCLR\fP to clear all waveforms and added data. .br Step 2. \fBWVAG\fP/\fBWVAS\fP calls to supply the waveform data. .br Step 3. \fBWVCRE\fP to create the waveform and get a unique id. .br Repeat steps 2 and 3 as needed. .br Step 4. \fBWVTX\fP or \fBWVTXR\fP with the id of the waveform to transmit. .br A waveform comprises of one or more pulses. .br A pulse specifies .br 1) the gpios to be switched on at the start of the pulse. .br 2) the gpios to be switched off at the start of the pulse. .br 3) the delay in microseconds before the next pulse. .br Any or all the fields can be zero. It doesn't make any sense to set all the fields to zero (the pulse will be ignored). .br When a waveform is started each pulse is executed in order with the specified delay between the pulse and the next. .br \fBExample\fP .br .EX $ pigs wvas 4 9600 0 23 45 67 89 90 .br 37 .br $ pigs wvcre .br 0 .br .br $ pigs wvcre .br -69 .br ERROR: attempt to create an empty waveform .br .EE .br .IP "\fBWVDEL wid\fP - Delete selected waveforms" .IP "" 4 .br This command deletes all waveforms with ids greater than or equal to \fBwid\fP. .br Upon success nothing is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs wvdel 0 .br .br $ pigs wvdel 0 .br -66 .br ERROR: non existent wave id .br .EE .br .IP "\fBWVGO \fP - Transmit waveform once (DEPRECATED)" .IP "" 4 .br This command transmits the current waveform. The waveform is sent once. .br Upon success the number of DMA control blocks in the waveform is returned. On error a negative status code will be returned. .br .IP "\fBWVGOR \fP - Transmit waveform repeatedly (DEPRECATED)" .IP "" 4 .br This command transmits the current waveform. The waveform is sent repeatedly. .br Upon success the number of DMA control blocks in the waveform is returned. On error a negative status code will be returned. .br .IP "\fBWVHLT \fP - Stop waveform" .IP "" 4 .br This command aborts the transmission of the current waveform. .br Nothing is returned. .br This command is intended to stop a waveform started in the repeat mode. .br \fBExample\fP .br .EX $ pigs wvhlt .br .EE .br .IP "\fBWVNEW \fP - Initialise a new waveform" .IP "" 4 .br This clears any existing waveform data ready for the creation of a new waveform. .br Nothing is returned. .br \fBExample\fP .br .EX $ pigs wvnew .br .EE .br .IP "\fBWVSC ws\fP - Get waveform DMA CB stats" .IP "" 4 .br The statistic requested by \fBws\fP is returned. .br \fBws\fP identifies the subcommand as follows. .br 0 Get Cbs .br 1 Get High Cbs .br 2 Get Max Cbs .br \fBExample\fP .br .EX $ pigs wvas 4 9600 0 23 45 67 89 90 .br 37 .br .br $ pigs wvsc 0 .br 74 .br $ pigs wvsc 1 .br 74 .br $ pigs wvsc 2 .br 25016 .br .EE .br .IP "\fBWVSM ws\fP - Get waveform time stats" .IP "" 4 .br The statistic requested by \fBws\fP is returned. .br \fBws\fP identifies the subcommand as follows. .br 0 Get Micros .br 1 Get High Micros .br 2 Get Max Micros .br \fBExample\fP .br .EX $ pigs wvsm 0 .br 5314 .br $ pigs wvsm 1 .br 5314 .br $ pigs wvsm 2 .br 1800000000 .br .EE .br .IP "\fBWVSP ws\fP - Get waveform pulse stats" .IP "" 4 .br The statistic requested by \fBws\fP is returned. .br \fBws\fP identifies the subcommand as follows. .br 0 Get Pulses .br 1 Get High Pulses .br 2 Get Max Pulses .br \fBExample\fP .br .EX $ pigs wvsp 0 .br 37 .br $ pigs wvsp 1 .br 37 .br $ pigs wvsp 2 .br 12000 .br .EE .br .IP "\fBWVTX wid\fP - Transmit waveform once" .IP "" 4 .br This command transmits the waveform with id \fBwid\fP once. .br Upon success the number of DMA control blocks in the waveform is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs wvtx 1 .br 75 .br .br $ pigs wvtx 2 .br -66 .br ERROR: non existent wave id .br .EE .br .IP "\fBWVTXR wid\fP - Transmit waveform repeatedly" .IP "" 4 .br This command transmits the waveform with id \fBwid\fP repeatedly. .br Upon success the number of DMA control blocks in the waveform is returned. On error a negative status code will be returned. .br \fBExample\fP .br .EX $ pigs wvtxr 1 .br 75 .br .br $ pigs wvtxr 2 .br -66 .br ERROR: non existent wave id .br .EE .br .SH PARAMETERS .br .IP "\fBb\fP - baud (100-250000)" 0 The command expects a baud rate for serial data. .br .IP "\fBbit\fP - bit value (0-1)" 0 The command expects 0 or 1. .br .IP "\fBbits\fP - a bit mask" 0 A mask is used to select one or more gpios. A gpio is selected if bit (1<=0)" 0 The command expects a handle. .br A handle is a number referencing an object opened by one of \fBI2CO\fP, \fBNO\fP, \fBSERO\fP, \fBSPIO\fP. .br .IP "\fBib\fP - I2C bus (0-1)" 0 The command expects an I2C bus. .br .IP "\fBid\fP - I2C device (0x08-0x77)" 0 The command expects the address of an I2C device. .br .IP "\fBif\fP - I2C flags (0)" 0 The command expects an I2C flags value. No flags are currently defined. .br .IP "\fBL\fP - level (0-1)" 0 The command expects a gpio level. .br .IP "\fBm\fP - mode (RW540123)" 0 The command expects a mode character. .br Each gpio can be configured to be in one of 8 different modes. The modes are named Input, Output, ALT0, ALT1, ALT2, ALT3, ALT4, and ALT5. .br To set the mode use the code for the mode. .br The value is returned by the mode get command. .br .EX Mode Input Output ALT0 ALT1 ALT2 ALT3 ALT4 ALT5 Code R W 0 1 2 3 4 5 Value 0 1 4 5 6 7 3 2 .EE .br .IP "\fBnum\fP - number of bytes to read (1-)" 0 The command expects the number of bytes to read. .br For the I2C and SPI commands the requested number of bytes will always be returned. .br For the serial commands the smaller of the number of bytes available to be read (which may be zero) and \fBnum\fP bytes will be returned. .br .IP "\fBo\fP - offset (>=0)" 0 Serial data is stored offset microseconds from the start of the waveform. .br .IP "\fBp\fP - PUD (ODU)" 0 The command expects a PUD character. .br Each gpio can be configured to use or not use an internal pull up or pull down resistor. This is useful to provide a default state for inputs. .br A pull up will default the input to 1 (high). .br A pull down will default the input to 0 (low). .br To set the pull up down state use the command character for the state. .br .EX Pull Up Down Off Pull Down Pull Up Command Character O D U .EE .br There is no mechanism to read the pull up down state. .br .IP "\fBpars\fP - script parameters" 0 The command expects 0 to 10 numbers as parameters to be passed to the script. .br .IP "\fBpl\fP - pulse length (1-50)" 0 The command expects a pulse length in microseconds. .br .IP "\fBr\fP - register (0-255)" 0 The command expects an I2C register number. .br .IP "\fBsef\fP - serial flags (32 bits)" 0 The command expects a flag value. No serial flags are currently defined. .br .IP "\fBsid\fP - script id (>= 0)" 0 The command expects a script id as returned by a call to \fBPROC\fP. .br .IP "\fBspf\fP - SPI flags (32 bits)" 0 The flags consists of the least significant 8 bits. .br .EX 7 6 5 4 3 2 1 0 .br n n n n W P m m .br .EE .br mm defines the SPI mode. .br .EX Mode POL PHA .br 0 0 0 .br 1 0 1 .br 2 1 0 .br 3 1 1 .br .EE .br P is 0 for active low chip select (normal) and 1 for active high. .br W is 0 if the device is not 3-wire, 1 if the device is 3-wire. .br nnnn defines the number of bytes (0-15) to write before switching the MOSI line to MISO to read data. This field is ignored if W is not set. .br The other bits in flags should be set to zero. .br .IP "\fBt\fP - text (a string of text)" 0 The command expects a text string. .br .IP "\fBtrips\fP - triplets" 0 The command expects 1 or more triplets of gpios on, gpios off, delay. .br E.g. 0x400000 0 100000 0 0x400000 900000 defines two pulses as follows .br .EX gpios on gpios off delay 0x400000 (gpio 22) 0 (None) 100000 (1/10th s) 0 (None) 0x400000 (gpio 22) 900000 (9/10th s) .EE .br .IP "\fBu\fP - user gpio (0-31)" 0 The command expects the number of a user gpio. .br A number of commands are restricted to gpios in bank 1, in particular the PWM commands, the servo command, the watchdog command, and the notification command. .br It is your responsibility to ensure that the PWM and servo commands are only used on safe gpios. .br See \fBg\fP .br .IP "\fBv\fP - value" 0 The command expects a number. .br .IP "\fBwid\fP - wave id (>=0)" 0 The command expects a wave id. .br When a waveform is created it is given an id (0, 1, 2, ...). .br .IP "\fBws\fP - wave stats sucommand (0-2)" 0 The command expects a subcommand. .br 0 = current value. .br 1 = highest value so far. .br 2 = maximum possible value. .br .IP "\fBwv\fP - word value (0-65535)" 0 The command expects a word value. .br .SH SCRIPTS .br Scripts are programs to be stored and executed by the pigpio daemon. They are intended to mitigate any performance problems associated with the pigpio daemon server/client model. .br .SS Example .br A trivial example might be useful. Suppose you want to toggle a gpio on and off as fast as possible. .br From the command line you could write .br .EX for ((i=0; i<1000;i++)); do pigs w 22 1 w 22 0; done .br .EE .br Timing that you will see it takes about 14 seconds, or roughly 70 toggles per second. .br Using the pigpio Python module you could use code such as .br .EX #!/usr/bin/env python .br .br import time .br .br import pigpio .br .br PIN=4 .br .br TOGGLE=10000 .br .br pi = pigpio.pi() # Connect to local Pi. .br .br s = time.time() .br .br for i in range(TOGGLE): .br pi.write(PIN, 1) .br pi.write(PIN, 0) .br .br e = time.time() .br .br print("pigpio did {} toggles per second".format(int(TOGGLE/(e-s)))) .br .br pi.stop() .br .EE .br Timing that shows a speed improvement to roughly 800 toggles per second. .br Now let's use a script. .br .EX pigs proc tag 999 w 22 1 w 22 0 dcr p0 jp 999 .br .EE .br Ignore the details for now. .br Let's time the script running. .br Again, ignore the details for now. .br .EX time (pigs procr 0 10000000; while a=$(pigs procp 0); [[ ${a::1} -eq 2 ]];\ .br do sleep 0.2; done) .br .EE .br The script takes roughly 12 seconds to complete, or 800,000 toggles per second. .br That is the advantage of a stored script. .br Some details. .br .EX pigs proc tag 999 w 22 1 w 22 0 dcr p0 jp 999 .br .EE .br proc introduces a script. Everything after proc is part of the script. .br tag 999 names the current position in the script. .br w 22 1 writes 1 to gpio 22. .br w 22 0 writes 0 to gpio 22. .br dcr p0 decrements parameter 0. .br jp 999 jumps to tag 999 if the result is positive. .br .EX time (pigs procr 0 10000000; while a=$(pigs procp 0); [[ ${a::1} -eq 2 ]];\ .br do sleep 0.2; done) .br .EE .br pigs procr 0 10000000 starts script 0 with parameter 0 of 10 million. .br The rest is bash apart from .br pigs procp 0 asks for the status and parameters of script 0. The status will be 2 while the script is running and 1 when it is complete. .br .SS Virtual machine .br A script runs within a virtual machine with .br a 32 bit accumulator A. .br a flags register F. .br a program counter PC. .br Each script has .br 10 parameters named 0 through 9. .br 150 variables named 0 through 149. .br 50 labels which are named by any unique number. .br .SS Commands .br All the normal pigs commands may be used within a script. .br The following commands are only legal within a script. .br .EX Command Description Definition ADD x Add x to accumulator A+=x; F=A AND x And x with accumulator A&=x; F=A CALL L Call subroutine at tag L push(PC+1); PC=L CMP x Compare x with accumulator F=A-x DCR y Decrement register --*y; F=*y DCRA Decrement accumulator --A; F=A DIV x Divide x into accumulator A/=x; F=A HALT Halt Halt INR y Increment register ++*y; F=*y INRA Increment accumulator ++A; F=A JM L Jump if minus to tag L if (F<0) PC=L JMP L Jump to tag L PC=L JNZ L Jump if non-zero to tag L if (F) PC=L JP L Jump if positive to tag L if (F>=0) PC=L JZ L Jump if zero to tag L if (!F) PC=L LD y x Load register with x *y=x LDA x Load accumulator with x A=x MLT x Multiply x with accumulator A*=x; F=A MOD x Modulus x with accumulator A%=x; F=A OR x Or x with accumulator A|=x; F=A POP y Pop register y=pop() POPA Pop accumulator A=pop() PUSH y Push register push(y) PUSHA Push accumulator push(A) RET Return from subroutine PC=pop() RL y x Rotate left register x bits *y<<=x; F=*y RLA x Rotate left accumulator x bits A<<=x; F=A RR y x Rotate right register x bits *y>>=x; F=*y RRA x Rotate right accumulator x bits A>>=x; F=A STA y Store accumulator in register y=A SUB x Subtract x from accumulator A-=x; F=A SYS str Run external script (/opt/pigpio/cgi/str) system(str); F=A TAG L Label the current script position N/A WAIT x Wait for a gpio in x to change state A=wait(x); F=A X y1 y2 Exchange contents of registers y1 and y2 t=*y1;*y1=*y2;*y2=t XA y Exchange contents of accumulator and register t=A;A=*y;*y=t XOR x Xor x with accumulator A^=x; F=A .EE .br x may be a constant, a parameter (p0-p9), or a variable (v0-v149). .br y may be a parameter (p0-p9), or a variable (v0-v149). If p or v isn't specified y is assumed to be a variable. .br The WAIT command parameter is a bit-mask with 1 set for gpios of interest. .br .SH SEE ALSO pigpiod(1), pig2vcd(1), pigpio(3), pigpiod_if(3) .SH AUTHOR joan@abyz.co.uk