My serial programmer is directly on the board. The ATmega328PB is connected to a +5V rail and clocked with a ceramic resonator at 16MHz. I tried many different bootloaders and I get the same result with all of them. But if I wait 30s before programming it through serial I get this error :Īvrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xc1 If I try to upload a sketch right after I burn the bootloader it program the ATmega328PB through serial but the code seems to be "randomly executed". My problem occur when I'm trying to upload a sketch from serial. ) with an arduino UNO connected to it through ICSP pin header and it worked just fine. I tried MiniCore to burn the bootloader (and many others. I'm trying to develop a new board using an ATmega328PB-MU.
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