Bindings to Linux I2C with support for repeated-start transactions.

H2C is a high-level binding to the Linux I2C subsystem with support for repeated-start transactions, not just individual reads and writes.

h2c: Haskell bindings to Linux I2C API

H2C is a binding to the Linux i2c-tools/i2c-dev API. It uses the I2C_RDWR ioctl for repeated-start communications between master and slave.

Notes

• You'll probably have to run as root. Getting regular users direct access to i2c busses on Linux is tricky.
• The Linux i2c-stub driver that you might think would be useful for testing doesn't support the I2C_RDWR ioctl. This is why, if you try to use it, you'll get the "invalid argument" error.

Documentation

$ stack haddock --open, find module System.IO.I2C

BE CAREFUL WITH I2C. It can be used to poke at things like your graphics card, fans, &c.

See my library bno055-haskell for examples of h2c in use.