nixfilter-rpi-gpio

Filter" (non-interactive command-line tool reading from STDIN and writing to STDOUT) for sending binary signal sequences via the GPIO pin of a Raspberry Pi.

Installation

$ npm install -g nixfilter-rpi-gpio

Requires Node.js. Must be run directly on a Raspberry Pi.

Command-line tools

nixfilter-rpi-gpio-send

nixfilter-rpi-gpio-send sends logic/binary signals via a GPIO pin of a Raspberry Pi. The logic/binary signals are read as lines from STDIN, as comma-separated integer values representing durations in nanoseconds. Negative values indicate "inactive"/"low" levels, positive values indicate "active"/"high" levels. For example, the input line "360000,-1080000,+1080000,360000" would output a binary signal of 360µs "high" level, followed by 1080µs "low" level, followed by 1080µs "high" level, followed by 360µs "low" level, on the specified GPIO pin.

$ nixfilter-rpi-gpio-send -h

usage: nixfilter-rpi-gpio-send [-h] [--latency LATENCY] [--inactive_state {low,high}]
                               gpio_pin_id

Send logic/binary signals via a GPIO pin of a Raspberry Pi. The logic/binary 
signals are read as lines from STDIN, as comma-separated integer values 
representing durations in nanoseconds. Negative values indicate 
"inactive"/"low" levels, positive values indicate "active"/"high" levels. For 
example, the input line "360000,-1080000,+1080000,360000" would output a 
binary signal of 360µs "high" level, followed by 1080µs "low" level, followed 
by 1080µs "high" level, followed by 360µs "low" level.

Positional arguments:
  gpio_pin_id           The numerical ID of the GPIO pin to use for 
                        outputting the signals

Optional arguments:
  -h, --help            Show this help message and exit.
  --latency LATENCY, -l LATENCY
                        The latency overhead (in microseconds) for every 
                        signal. This depends on the Raspberry Pi being used; 
                        on the Raspberry Pi 3B+, this is about 65. (default: 
                        65)
  --inactive_state {low,high}, -i {low,high}
                        The GPIO pin's inactive state, if no signal is being 
                        sent (default: low)