This is my first experience with trying to upload bootloaders and I'm having issues.
I'm use a USBASP into an adruino UNO. I'm powering the board with the USBASP.
First some basic questions:
- When you upload a bootloader to an Arduino UNO, do you need a sketch, or do you just select 'Tools\Burn Bootloader'.
- What bootloader file is being uploaded if you don't select a .hex file from the 'Sketch/Add File..Arduino\Hardware\bootloaders\arduino\filename.."? Does it default to some standard bootloader, or does it upload nothing and fail?
One error message I receive after an attempt is this:
avrdude: warning: cannot set sck period. please check for usbasp firmware update.
HOWEVER, when I upload a sketch using the USBASP via 'File\Upload Using Programmer, the sketch seems to load. I've been using the blink led sketch to confirm this.
The other issue is when I go back to a plain usb cable from the Arduino UNO to the PC, I can no longer upload sketches using the standard 'Upload Sketch' option. I get the error message:
avrdude: stk500_getsync(): not in sync: resp=0x00