Attiny85 bootloader

Development Tools IDE 1.x
1

hi all

Can i write below code to Attiny85. im getting error while burning to chip. please help me im in a trouble.

const int buttonPin = 2;
const int ledPin = 0;

byte ledFlag = 0;
byte enableFlag = 0;
unsigned long ledTime;
unsigned long flashTime;
const unsigned long flashRate = 100UL;

int buttonState = 0;

void setup()
{

pinMode(ledPin, OUTPUT);

pinMode(buttonPin, INPUT_PULLUP);
}

void loop()
{
buttonState = digitalRead(buttonPin);

if (buttonState == HIGH && ledFlag == 0)
{
digitalWrite(ledPin, HIGH);
ledFlag = 1;
enableFlag = 1;
ledTime = millis();
flashTime = millis();
}

if (enableFlag == 1 && millis() - ledTime <= 4500UL)
{
if (millis() - flashTime >= flashRate)
{
flashTime = millis();
digitalWrite(ledPin, !digitalRead(ledPin));
}
}
else
{
enableFlag = 0;
digitalWrite(ledPin, LOW);
}

if (buttonState == LOW)
{
ledFlag = 0;
enableFlag = 0;
digitalWrite(ledPin, LOW);
}

}

2

People usually do not use a bootloader to program the ATTiny85. You upload to them using an ISP programmer (either an Arduino with ArduinoAsISP sketch and 10uf cap between reset and ground, or one of the many purpose-made ISP programmers like the USB Asp) - this does not involve any bootloader (though you still use "burn bootloader" to set the speed it runs at - they come by default programmed at 1mhz internal, and you normally want them at 8mhz internal).

However, there are some special Tiny85 based boards like the digispark that do have some wierd custom bootloader.

So - are you using a normal ATTiny on breadboard or simple breakout, or something weird like a digispark?

What ISP programmer are you using? (I recommend USB Asp or ArduinoAsISP sketch on an Uno/Nano)

What error do you get? Always post the exact text of any and all errors you receive, when asking for technical help with anything that gives an error message. The errors have meaning.