Nokia 1100 lcd driver for AVR (avr-gcc) PCF8814

This is a porting of a PCF8814 driver from Microhip C (PIC) to avr-gcc.
The driver emulates an I2C communication and can be used on any digital pins of the same port.
Remember that this lcd module works with 3.3V.

LCD pinout:
1 xcs (chip select)
2 xres (reset)
3 vss (gnd)
4 sda (data)
5 scl (clock)
6 vdd (display supply)
7 vddi (logic supply)
8 led+

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nokia 1100 lcd pcf8814

nokia 1100 lcd (pcf8814)