add: avr_powerup(fd);
context: int avr_initialize ( int fd ){  int rc;  int tries;  ppi_clr(fd, PPIDATA, AVR_CLOCK);  ppi_clr(fd, PPIDATA, AVR_RESET);  ppi_toggle(fd, PPIDATA, AVR_RESET);  usleep(20000); /* 20 ms */  tries = 0;  do {    rc = avr_program_enable ( fd );    if (rc == 0)      break;    ppi_toggle(fd, PPIDATA, AVR_CLOCK);    tries++;  } while (tries < 32);  if (tries == 32) {    fprintf ( stderr, "%s: AVR device not responding\n", progname );    return -1;  }  return 0;}