Install:

apt-get install gccavr avrdude avr-libc

Use:

make && avr-objdump --disassemble asmdemo.elf  | tail -5
avrdude -p t13 -c stk500v2 -P /dev/ttyUSB0 -U asmdemo.hex

to flash.

			.-------.    /        
	      /RESET ---|   U	|---o o---- Li-ION +3.6V  -------+
			|	|                                |
	      PWM1  <---|attiny	|-----------------------+-/\/\/\-+
			|   13	|    /                  |     R=3.9K
	      PWM2  <---|	|---o o--+- GND -/\/\/\-'
			|	|        |          R=1K
		 GND ---|	|---|>|--'
			`-------'   green LED + 1K ohm

ADC: 1.1V reference, 10bit. -> I need n/4. Can we reuse RESET pin?
Probably not.

Finalized circuit should be:

						 I used two zener's (10V) for
						protection, nad lots of condensators
						were needed.

                                IRF7416 P-MOSFET
	LiION 3.6V         ---------++ +---------+---------------.
                                   ------        |               |
                                     --.         |               |
				       |         O             -----
				       |         O              / \    LED
				     PWM         O             /___\
				                 O               |
				                 O 22uH 3A       | (+ shottky)
				                 O               | 
				                 |               | 
         LiION GND         ----------------------+---------------'

Shottky _is_ needed, and ceramic capacitors, otherwise current goes
backwards very fast.

Part list:

L-XK2-PW14-U00			 125Kc GM http://www.gme.cz/cz/index.php?page=product&detail=511-813
ATTINY13-20PU			  35Kc GM
RR 10K		odpor 0.6W
RR 1K		odpor 0.6W
RR 3K9		odpor 0.6W
CK 100N/63V	kondenzator
CK 10N/63V RM 5mm ZS
DPU022A3	tlumivka 22uH 3A 22Kc GM  [LN 22uH, LO 34uH, Rcu 0.05Ohm, 99uJ]
FHS-LXHL-NX05	reflektor luxeon 120Kc GM
IRF7416			       <30Kc GES http://www.ges.cz/sheets/i/irf7416.pdf

Attiny eats about 700uA when no leds are running (@3xNiMH). 1.8mA
@green indicator running.

200uA goes through the FETs when it is all powered down, somehow :-(.

That !@#(*!# circuit is willing to run out of my _ohmmeter_!

No, it is not cursed, I just had empty bateries :-(.

attiny is running at 9.6MHz / 8 by default. We should be able to speed
it up to 9.6MHz by selecting fuses.

qucs is useful.

Hodila by se PFRA.300 ? 
A 2x 1N4733A zenerku. 
7 ohm odpor?
pojistku 10A pro erika?

50usec / 50usec	- good efficiency?
50usec / 35usec - up to 5A on input, cca 0.7A on output.
70usec / 35usec - up to 4A on input, 0.75A on output.
5usec / 3.5usec - up to 4A on input (?!), 0.28A on output.
5usec / 5usec - 0.5A on input, 120mA on output.
15usec/ 15usec - 2A on input, <0.5A on output. 300mA?

5usec / 20usec - cca 25mA output.
1usec / 6usec - cca 6mA output.
1usec / 1usec -- only 25mA output with 50mA peak ahead?