To mark:
Raspberry Pi is rather a micro-computer than a micro-controller and is a very (too) big target for ldmicro...
It requires it's own OS to work, not easy to mix with ldmicro cycles.
This Interpreter only decodes the most simple INT instructions but it seems that you can add some more (like uart) if you feel like, using wiringpi as said in your file:
https://projects.drogon.net/raspberry-pi/wiringpi/
There are libraries for Uart, Spi, I2C, Pwm...
JG