How to program ATtiny13A with Arduino as ISP

Install WinAVR

http://winavr.sourceforge.net/

Set fuse bits

Determine what bits using http://www.engbedded.com/fusecalc

DO CHECK "Serial program downloading"
DO NOT CHECK "Reset Disabled"
```
  -U lfuse:w:0x7a:m -U hfuse:w:0xff:m
```

for ATtiny13

Blink.cpp

LED on pin 2 of ATtiny

  #include <avr/io.h>
  #include <util/delay.h>

  int main(void)
  {
    DDRB = 1<<3; // port B3, ATtiny13a pin 2
    PORTB = 0x0;

    while (1)
    {
      PORTB = 1<<3; // port B3, ATtiny13a pin 2
      _delay_ms(500);
      PORTB = 0X0;
      _delay_ms(250);
    }
  }

Compiling Blink.cpp

1) Using avr-gcc

avr-gcc -g -DF_CPU=9600000 -Wall -Os -mmcu=attiny13a -c -o tmp.o blink.cpp
avr-gcc -g -DF_CPU=9600000 -Wall -Os -mmcu=attiny13a -o tmp.elf tmp.o
avr-size tmp.elf
avr-objcopy -j .text -j .data -O ihex tmp.elf tmp.hex

or put in a batch file (build.bat) with pause at the end to read output when double-clicked

2) Using a makefile

Just type make in cmd prompt of directory where makefile is located

Program Arduino as ISP

Use ISP sketch in Arduino program (Examples -> Arduino ISP)
Change baud rate to 9600

Put an LED and series resistor on the following pins to see the programming status:

9	Heartbeat		shows the programmer is running
8	Error			Lights up if something goes wrong
7	Programming		In communication with the slave

Connect Arduino and ATTiny13a as follows:

Signal name		ArduinoISP	ATtiny13A
SCK				13			7
MISO			12			6
MOSI			11			5
SS/reset		10			1
GND				GND         4
VCC				5V			8

Description of pins:

SCK		serial clock (output from master)
MISO	master input, slave output (output from slave)
MOSI	master output, slave input (output from master)
SS		slave select (active low, output from master)

Program Fuse bits

avrdude -p attiny13 -P com4 -c stk500v1  -b 9600 -q -U lfuse:w:0x7a:m -U hfuse:w:0xff:m

Uploading program

avrdude -p attiny13 -c stk500v1 -P com4 -b 9600 -q -U flash:w:tmp.hex

Notes from http://letsmakerobots.com/node/31379

dwaq/How to program ATTINY13A with Arduino as ISP.md