mkconfig

#!/bin/sh -eu
# -*- coding: utf-8; mode: sh; tab-width: 3; indent-tabs-mode: nil -*-
#
# Copyright 2022 Raffaello D. Di Napoli
#
# This file is part of RAWR.
#
# RAWR is free software: you can redistribute it and/or modify it under the terms of version 2.1 of the GNU
# Lesser General Public License as published by the Free Software Foundation.
#
# RAWR is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
# for more details.
#-------------------------------------------------------------------------------------------------------------

begin_shade() {
   printf '\033[1;30m' >&2
}

end_shade() {
   printf '\033[0m' >&2
}

printf 'Enter %s [%s]: ' 'MCU model' 'detect with avrdude' >&2
read MCU
if [ -z "${MCU}" ]; then
   begin_shade
   # Note that we don’t actually use the signature bytes read, because we instead extract avrdude’s guess at
   # which MCU it connected to.
   MCU=$(
      ${AVRDUDE} -p m328 -U signature:r:-:h 2>&1 |
      tee /dev/stderr |
      sed -ne 's/^avrdude: Device signature = 0x[^ ]\+ (probably \([^)]\+\))$/\1/p' |
      sed -ne '
         s/^c/AT90CAN/p; t
         s/^m/ATmega/p; t
         s/^t/ATtiny/p; t
         s/^usb/AT90USB/p; t
         s/^x/ATxmega/p; t
         s/^[0-9]/AT90S&/p; t
      '
   )
   end_shade
   if [ -z "${MCU}" ]; then
      echo 'Unable to detect MCU; aborting' >&2
      exit 1
   fi
   echo "Detected MCU: ${MCU}" >&2
fi
echo "MCU?=${MCU}"

printf 'Enter %s [%s]: ' 'in-circuit CPU frequency (F_CPU) in Hz' '1000000' >&2
read F_CPU
if [ -z "${F_CPU}" ]; then
   F_CPU=1000000
fi
echo "F_CPU?=${F_CPU}"