Attiny85 rc=-1 failure (on external clock only!)

Development Tools Uploading
1

Hi,

I normally have no problems uploading my code using the Sparkun Tiny AVR Programmer to my Attiny85. But whenever I change the clock to "8Mhz external" and Burn Bootloader I get this message:

"avrdude: initialization failed, rc=-1". After this I cant upload any code or re burn the bootlader back to that chip.

I know the connections are fine as putting another chip into the programmer poses no problems!

I use Spencer Konde AttinyCore for this.

Thanks for any insights
Dave

2

Managed to to sort it out and all good now!

I just had to stick a crystal to pins PB 3&4 (no caps required) on the Sparkfun programmer and then Burn Bootloader with clock set to "8Khz external". All working. Newbie mistake :slight_smile:

3

Solution provided: karma++

4

Thank you. My first Karma point :slight_smile: