Compiled with SDCC (last used 4.0.2 #11679 (Linux) ) - http://sdcc.sourceforge.net/
Programmed with easy-pdk-programmer (1.3 - latest development branch) - https://github.com/free-pdk
Using https://github.com/free-pdk/pdk-includes.git
and https://github.com/free-pdk/easy-pdk-includes.git

PDK8574 - I2C GPIO expander, similar to PCF8574

i2c-SFRaccess - created to ease development and debugging pdk uc's with it you can set/read internal registers through i2c and test values without wasting OTP ic's

i2c-fancontroller - WIP - i2c controller for PC FAN (with 4pins) currently it can: set fan speed trough pwm duty cycle, read speed in hertz and RPM. It contains some tips how to read/write t16 counter, use comparator as additional pin change interrupt

i2c-slave - some bare minimum i2c slave implementation

WARNING: all that code depends on SDCC peephole optimization. It's pattern search&replace on asm code. I have wrote some rules to meet timing requirements of i2c communication, they are in peephole_rules folder

git clone https://github.com/kaweksl/pdk-codebucket.git
cd pdk-codebucket
git submodule update --init --recursive

Edit Makefile in selected project, adjust sdcc and easypdkprog path and

make

make flash-PFS154