Swift classes to control the PCA9685 module and Adafruit 16 channel PWM servo driver breakout.
## Dependencies To communicate with the PCA9685 or the Adafruit PWM servo boards it's necessary to use I2C protocol. The swift SMBus library is used by this library as the way to communicate with the module.
If the app is running on Raspbian, the I2C should be enabled via raspi-config in Advanced Options.
Before beign able to use SMBus in your Swift code, you should install some Linux C libraries.
On a Debian-like distro:
sudo apt-get install i2c-tools libi2c-dev
Then you have to make sure the i2c module is active. So check or add i2c-dev to /etc/modules. Like:
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
i2c-dev
On recent Raspberry Pi the Adafruit PWM breakout is on the bus number 1, linux device /dev/i2c-1.
The address on the SMBus is the 0x40. To check, from terminal:
sudo i2cdetect -y 1
## Compiling Since the Swift package manger still does not work on Raspberry Pi (where I am compiling), the compiler should be informed by the different dependencies to compile.
swiftc \
-I ./Packages/SMBus-swift/Packages/Ci2c/ \
-I ./Packages/SMBus-swift/Packages/CioctlHelper/ \
./Packages/SMBus-swift/Sources/*.swift \
Sources/*.swift \
[YOUR SWIFT SOURCE FILES]
To compile the example app, wich has two LEDs connected to the channel 0 and 1:
swiftc \
-I ./Packages/SMBus-swift/Packages/Ci2c/ \
-I ./Packages/SMBus-swift/Packages/CioctlHelper/ \
./Packages/SMBus-swift/Sources/*.swift \
Sources/*.swift \
Examples/PCA9685Module/main.swift
Inspiration from:
- TeraHz's C++ PCA9685
- Brunnels' C++ PCA9685
- Adafruit's Node.js i2c pwm driver
## Contacts Claudio Carnino, tugulab.org