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cmd

README.md

periph/cmd - read-to-use executables

This directory contains directly usable tools installable via:

go get periph.io/x/periph/cmd/...

Most of the tools can optionally leverage drivers in hostextra when the build tag periphextra is defined:

go get -u -tags periphextra periph.io/x/periph/cmd/...

This permits taking advantage of drivers like FTDI's D2XX.

Push

If you prefer to build on your workstation and push the binaries to the micro computer, install push from periph.io/x/bootstrap to cross compile and efficiently push via rsync:

go get -u periph.io/x/bootstrap/cmd/push
push -host pi@raspberrypi periph.io/x/periph/cmd/...

Recommended first use

Try first periph-info. It will print out if any driver failed to run, for example if you have to run as root to access certain drivers.

Then run headers-list to list all the headers on your board and confirm that you get the expected output. If your board is missing, you can contribute it.

Devices

  • apa102: Writes to a LED strip of APA-102 (sometimes called Dotstar). Can show an image animating on the Y axis.
  • bmxx80: Reads the temperature, pressure and humidity off a bmp180/bme280/bmp280. Humidity sensing is only supported on bme280.
  • cap1xxx: Reads the capacitive sensor family.
  • ir: Reads codes (button presses) on an InfraRed remote sensor.
  • led: Reads the state of on-board LEDs.
  • ssd1306: Writes text, an image or an animated GIF to an OLED display.
  • tm1637: Writes to a segment digits display.

Buses

  • gpio-list: Looking for the GPIO pins per functionality? Prints the state of each GPIO pin.
  • gpio-read: Read the input value of a GPIO pin and change input resistor.
  • gpio-write: Change the output value of a GPIO pin.
  • headers-list: Pinrts the location of the pin on the header to connect your GPIO. This is the perfect tool to know where to connect the wires.
  • i2c-io: Reads and/or writes to an I²C device.
  • i2c-list: Lists which I²C buses are enabled and where the pins are.
  • spi-io: Reads and/or writes to an SPI device.
  • spi-list: Lists which SPI ports are enabled and where the pins are.

Other

  • periph-info: Lists which periph drivers loaded and which failed.
  • periph-smoketest: Runs one of the smoke test for the drivers. The smoke test differs from unit tests as they require real hardware to confirm that the driver being tested works.

Troubleshooting

Having trouble getting the tools to run? File an issue or better visit the Slack channel. You can get an invite here.