GitHub - begemotv2718/attiny_i2c_registers: Smbus i2c registers on attiny

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Name		Name	Last commit message	Last commit date
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attiny_i2c		attiny_i2c
docs		docs
.gitignore		.gitignore
Makefile		Makefile
README		README
adc.c		adc.c
adc.h		adc.h
main.c		main.c
softuart.c		softuart.c
softuart.h		softuart.h
usiTwiSlave.c		usiTwiSlave.c
usiTwiSlave.h		usiTwiSlave.h

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Implementation of smbus i2c slave with registers on attiny mcu. 

Write register: view from master (slave replies in brackets)
START Addr Wr [ACK] RegNum [ACK] Value [ACK] STOP

Read register: view from master

START Addr Wr [ACK] RegNum [ACK] START Addr Rd [RegValue] NAK STOP

Seems to work for slow transfers (<5kHz).