diff --git a/src/stk500.c b/src/stk500.c index 44f1c739..0aef1947 100644 --- a/src/stk500.c +++ b/src/stk500.c @@ -111,6 +111,14 @@ int stk500_getsync(PROGRAMMER * pgm) max_sync_attempts = MAX_SYNC_ATTEMPTS; for (attempt = 0; attempt < max_sync_attempts; attempt++) { + // Restart Arduino bootloader for every sync attempt + if (strcmp(pgm->type, "Arduino") == 0 && attempt > 0) { + serial_set_dtr_rts(&pgm->fd, 0); // Set DTR and RTS low + usleep(250*1000); + serial_set_dtr_rts(&pgm->fd, 1); // Set DTR and RTS back to high + usleep(50*1000); + stk500_drain(pgm, 0); + } stk500_send(pgm, buf, 2); stk500_recv(pgm, resp, 1); if (resp[0] == Resp_STK_INSYNC){