Avr dude programmer

Question

I was trying to upload a hex file to my attiny85 with an arduino,and I came across this:

avrdude -c avrisp (followed by other codes and the flash address )

This doesn't work and it gave one of the most famous arduino errors : stk500_getsync() : not in sync: resp=0x00

Then I tried

   avrdude -c arduino 

And the code was successfully downloaded, but the chip itself doesn't work as intended. So this is the question, what does the -c [programmer id] actually do, for example in this case, does it download the hex file to my arduino?

Thanks in advance.

Answer 1

Try these steps:

1. Install ArduinoISP (in the examples menu) on your Arduino board.
2. Disable reset on the Arduino board by adding a 10µF capacitor between the RESET and GND pins.
3. Wire the ATTiny chip to the Arduino following this schematic.
4. Run the upload command using -c avrisp with your program's HEX file

Alternatively you can just install the boards package detailed in the schematic link and program it directly from the Arduino IDE instead of messing with the avrdude upload command.

You must also ensure that you are uploading at the right baud rate. The ArduinoISP sketch defaults to 19200 baud:

// Configure the baud rate:

#define BAUDRATE    19200
// #define BAUDRATE 115200
// #define BAUDRATE 1000000

and you must match that in your avrdude command with, for example, -b 19200.