klipper-firmware: init at klipper.version

- Add `klipper-genconf` helper to generate firmware configs
- Add `klipper-flash` helper to flash firmware to microcontroller

By default, klipper-firmware is built with a simulator config. Override
`firmwareConfig` with a generated config from `klipper-genconf`. To
flash the firmware, override `flashDevice` in `klipper-flash`.

pkgs/servers/klipper/klipper-firmware.nix

@@ -0,0 +1,66 @@
+{ stdenv
+, lib
+, pkg-config
+, pkgsCross
+, bintools-unwrapped
+, libffi
+, libusb1
+, wxGTK
+, python2
+, python3
+, gcc-arm-embedded
+, klipper
+, avrdude
+, stm32flash
+, mcu ? "mcu"
+, firmwareConfig ? ./simulator.cfg
+, flashDevice ? null
+}: stdenv.mkDerivation rec {
+  name = "klipper-firmware-${mcu}-${version}";
+  version = klipper.version;
+  src = klipper.src;
+
+  nativeBuildInputs = [
+    python2
+    python3
+    pkgsCross.avr.stdenv.cc
+    gcc-arm-embedded
+    bintools-unwrapped
+    libffi
+    libusb1
+    avrdude
+    stm32flash
+    pkg-config
+    wxGTK # Required for bossac
+  ];
+
+  preBuild = "cp ${firmwareConfig} ./.config";
+
+  postPatch = ''
+    patchShebangs .
+  '';
+
+  makeFlags = [
+    "V=1"
+    "KCONFIG_CONFIG=${firmwareConfig}"
+  ];
+
+  installPhase = ''
+    mkdir -p $out
+    cp ./.config $out/config
+    cp -r out/* $out
+
+    if ${lib.boolToString (!isNull flashDevice)}; then
+      make FLASH_DEVICE=${toString flashDevice} OUT=$out/ KCONFIG_CONFIG=$out/config flash
+    fi
+  '';
+
+  dontFixup = true;
+
+  meta = {
+    inherit (klipper.meta) homepage license;
+    description = "Firmware part of Klipper";
+    maintainers = with lib.maintainers; [ vtuan10 ];
+    platforms = lib.platforms.linux;
+  };
+}

pkgs/servers/klipper/klipper-flash.nix

@@ -0,0 +1,42 @@
+{ lib
+, writeShellApplication
+, gnumake
+, pkgsCross
+, klipper
+, klipper-firmware
+, python2
+, avrdude
+, stm32flash
+, mcu ? "mcu"
+, flashDevice ? "/dev/null"
+}:
+let
+  firmwareConfig = builtins.readFile "${klipper-firmware}/config";
+  isNotSupported = with builtins; isNull (match ''^.*CONFIG_BOARD_DIRECTORY="(avr|stm32|lpc176x)".*$'' firmwareConfig);
+  isNotStm = with builtins; isNull (match ''^.*CONFIG_BOARD_DIRECTORY="(stm32)".*$'' firmwareConfig);
+in
+writeShellApplication {
+  name = "klipper-flash-${mcu}";
+  runtimeInputs = [
+    python2
+    avrdude
+    stm32flash
+    pkgsCross.avr.stdenv.cc
+  ];
+  text = ''
+    NOT_SUPPORTED=${lib.boolToString isNotSupported}
+    NOT_STM=${lib.boolToString isNotStm}
+    if $NOT_SUPPORTED; then
+      printf "Flashing Klipper firmware to your board is not supported yet.\n"
+      printf "Please use the compiled firmware at ${klipper-firmware} and flash it using the tools provided for your microcontroller."
+      exit 1
+    fi
+    pushd ${klipper.src}
+    if $NOT_STM; then
+      ${gnumake}/bin/make FLASH_DEVICE="${toString flashDevice}" OUT="${klipper-firmware}/" KCONFIG_CONFIG="${klipper-firmware}/config" flash
+    else
+      ${gnumake}/bin/make FLASH_DEVICE="${toString flashDevice}" OUT="${klipper-firmware}/" KCONFIG_CONFIG="${klipper-firmware}/config" serialflash
+    fi
+    popd
+  '';
+}

pkgs/servers/klipper/klipper-genconf.nix

@@ -0,0 +1,22 @@
+{ writeShellApplication
+, klipper
+, python2
+, gnumake
+, pkgsCross
+}: writeShellApplication {
+  name = "klipper-genconf";
+  runtimeInputs = [
+    python2
+    pkgsCross.avr.stdenv.cc
+  ];
+  text = ''
+    CURRENT_DIR=$(pwd)
+    TMP=$(mktemp -d)
+    pushd ${klipper.src}
+    ${gnumake}/bin/make OUT="$TMP" KCONFIG_CONFIG="$CURRENT_DIR/config" menuconfig
+    popd
+    rm -rf "$TMP" config.old
+    printf "\nYour firmware configuration for klipper:\n\n"
+    cat config
+  '';
+}

pkgs/servers/klipper/simulator.cfg

@@ -0,0 +1,23 @@
+# CONFIG_LOW_LEVEL_OPTIONS is not set
+# CONFIG_MACH_AVR is not set
+# CONFIG_MACH_ATSAM is not set
+# CONFIG_MACH_ATSAMD is not set
+# CONFIG_MACH_LPC176X is not set
+# CONFIG_MACH_STM32 is not set
+# CONFIG_MACH_RP2040 is not set
+# CONFIG_MACH_PRU is not set
+# CONFIG_MACH_LINUX is not set
+CONFIG_MACH_SIMU=y
+CONFIG_BOARD_DIRECTORY="simulator"
+CONFIG_CLOCK_FREQ=20000000
+CONFIG_SERIAL=y
+CONFIG_SIMULATOR_SELECT=y
+CONFIG_SERIAL_BAUD=250000
+CONFIG_USB_VENDOR_ID=0x1d50
+CONFIG_USB_DEVICE_ID=0x614e
+CONFIG_USB_SERIAL_NUMBER="12345"
+CONFIG_HAVE_GPIO=y
+CONFIG_HAVE_GPIO_ADC=y
+CONFIG_HAVE_GPIO_SPI=y
+CONFIG_HAVE_GPIO_HARD_PWM=y
+CONFIG_INLINE_STEPPER_HACK=y

pkgs/top-level/all-packages.nix

@@ -3422,6 +3422,16 @@ with pkgs;
 
   klipper = callPackage ../servers/klipper { };
 
+  klipper-firmware = callPackage ../servers/klipper/klipper-firmware.nix {
+    inherit libusb1;
+  };
+
+  klipper-flash = callPackage ../servers/klipper/klipper-flash.nix {
+    inherit klipper-firmware;
+  };
+
+  klipper-genconf = callPackage ../servers/klipper/klipper-genconf.nix { };
+
   klog = qt5.callPackage ../applications/radio/klog { };
 
   krapslog = callPackage ../tools/misc/krapslog { };