change from mono-home-manager to full flake multi-system configuration

home/embedded.nix

@@ -0,0 +1,83 @@
+# You should run espup-init once per user to install toolchains.
+# 
+# For STM32/RP2040, you’ll likely configure chip names in flash-stm.
+# 
+# Add .cargo/config.toml for probe-rs targets like:
+# [target.riscv32imac-unknown-none-elf]
+# runner = "probe-rs run"
+# 
+# Set up arduino-cli using:
+# arduino-cli config init
+# arduino-cli core update-index
+# arduino-cli core install arduino:avr
+# 
+
+{ config, pkgs, lib, ... }:
+
+let
+  cfg = config.homeModules.embedded;
+in
+
+lib.mkIf cfg.enable {
+  home.packages = with pkgs; [
+    # General embedded tools
+    rustup
+    binutils
+    cargo-binutils
+    llvmPackages.bintools
+    openocd
+    dfu-util
+    minicom
+    picocom
+    lldb
+    gcc
+    gdb
+    # qemu # quick emulator
+    # gnumake 
+    # pkg-config
+
+    # ARM toolchains
+    gcc-arm-embedded
+
+    # Espressif ESP32
+    espup
+    espflash
+    #espmonitor
+    ldproxy
+    cargo-espflash
+
+    # ST-Link / J-Link / Debug probes
+    probe-rs
+    #jlink
+
+    # Arduino
+    arduino-cli
+  ];
+
+  # Optional system envs for toolchains or common paths
+  home.sessionVariables = {
+    ESPUP_INSTALL_PATH = "${config.home.homeDirectory}/.espressif";
+    RUSTUP_HOME = "${config.home.homeDirectory}/.rustup";
+    CARGO_HOME = "${config.home.homeDirectory}/.cargo";
+  };
+
+  # Udev rules for embedded devices (ESP, STLink, J-Link, Arduino)
+  # These must be placed on a NixOS system-wide level; for non-NixOS we print a helper
+  home.activation.printUdevHint = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    echo "📎 Embedded development: Make sure you have correct udev rules installed for USB devices."
+    echo "Examples:"
+    echo " - https://github.com/espressif/esp-idf/blob/master/tools/udev/60-esper-devices.rules"
+    echo " - https://probe.rs/docs/getting-started/installation/#udev-rules"
+    echo " - https://www.arduino.cc/en/guide/linux"
+    echo " - For STLink and J-Link adapters: udev rules are required for non-root flashing."
+  '';
+
+  # Optional: shell aliases to speed up common flows
+  programs.zsh.shellAliases = {
+    espup-init = "espup install";
+    flash-esp = "cargo espflash";
+    monitor-esp = "espmonitor";
+    flash-stm = "cargo flash --chip";
+    embed = "cargo embed";
+  };
+}