Hands On AVR

ArduinoISP

Arduino In-system programming (ISP) interface for the attiny13.

Step-by-step instructions:

• On the Arduino, the ArduinoISP code must be running. Open the Arduino IDE -> examples -> ArduinoISP and write.
• Install AVR toolchain: Windows, Mac
• Compile this code:

#define F_CPU 9600000	// Define software reference clock for delay duration
#include <avr/io.h>
#include <util/delay.h>
#define LED PB4 // Define led output on PB4
uint16_t d;
void delay_ms(uint16_t ms)
{
	for (uint16_t i = 0 ; i < ms ; i++) {
 		_delay_ms (1); // Loop delay
 	}
}
int main()
{
	d = 250; // delay time in ms

	DDRB |= (1 << LED); // Set direction to output for LED
	
	for (;;) {	// forever

		PORTB ^= (1 << LED);
		delay_ms(d);
	}
	return 0;
}

• run avrdude, make sure you choose the correct USB port and speed, i gave the program the name 'led.hex':

avrdude -P COM9 -b 19200 -c avrisp -p t13 -U flash:w:led.hex:i

AVR

more on AVR soon.