CP2112
Ruby wrapper for Silicon Laboratories CP2112 USB(HID) i2c/SMBus bridge library
Installation
Add this line to your application's Gemfile:
gem 'cp2112'And then execute:
$ bundle
Or install it yourself as:
$ gem install cp2112
Usage
require 'cp2112'
dev = CP2112[0, 0x10C4, 0xEA90] # [index, vendor id, product id], [0x10C4, 0xEA90] are default parameters
raise unless dev.getPartNumber[0] == 0x0C # must always be 0xC0
gpio_new = [
0x03, # GPIO.0-1: OUT, GPIO.2-7:IN
0x00, # open-drain
0x00, # GPIO
0x00, # clkDiv
]
dev.setGpioConfig(*gpio_new)
raise unless (dev.getGpioConfig == gpio_new)
50.times{|i| # toggle GPIO.0-1
bits = dev.readLatch[0]
dev.writeLatch(bits ^ 0x03, 0x03)
sleep(0.02)
}
# Read via I2C
#dev.i2c_read(addr, size) # addr is shifted by 1 bit (0bAAAA_AAAx, A=0/1, x=ignored)
# Write via I2C
#dev.i2c_write(addr, data) # byte array data is expected; data = [byte, ...]
# TODO: your i2c_read, i2c_write operation
# Other instance methods of dev is defined based on AN496
# https://www.silabs.com/documents/public/application-notes/an496-hid-usb-to-smbus-api-specification.pdf#page=2
# https://www.silabs.com/documents/public/application-notes/an496-hid-usb-to-smbus-api-specification.pdf#page=21
dev.closeDevelopment
After checking out the repo, run rake compile to install dependencies. Then, run rake spec to run the tests.
To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/fenrir-naru/ruby-cp2112.