restore shell.nix

shell.nix

@@ -0,0 +1,55 @@
+let
+    mozillaOverlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+    pkgs = import <nixpkgs> {overlays = [mozillaOverlay];};
+in with pkgs;
+let
+    migen = callPackage ./nix/migen.nix {};
+    openocd = callPackage ./nix/openocd.nix {};
+    rustPlatform = callPackage ./nix/rustPlatform.nix {};
+    itm = callPackage ./nix/itm.nix {inherit rustPlatform;};
+
+    runOpenOcdBlock = writeShellScriptBin "run-openocd-block" ''
+        openocd -f openocd/openocd.cfg
+    '';
+
+    openocdFlash = writeShellScriptBin "openocd-flash" ''
+        openocd -f openocd/openocd.cfg -f openocd/main.cfg
+    '';
+
+    publishMqtt = writeShellScriptBin "publish-mqtt" ''
+        mosquitto_pub -h localhost -t $1 -m "$2" -d
+    '';
+
+    openOCDFlashCustomised = writeShellScriptBin "openocd-flash-customised" ''
+        python3 flash.py $1 $2 $3 $4
+        openocd -f openocd/openocd.cfg \
+                -c "init 
+                    reset init 
+                    halt 
+                    stm32h7x mass_erase 1 
+                    flash write_image erase target/thumbv7em-none-eabihf/release/humpback-dds 
+                    flash write_image flash_config.bin 0x081e0000 bin 
+                    reset run 
+                    shutdown"
+    '';
+
+in
+    stdenv.mkDerivation {
+        name = "Humpback-DDS";
+        buildInputs = with rustPlatform.rust; [
+            (pkgs.python3.withPackages(ps: [ migen ]))
+            pkgs.yosys
+            pkgs.nextpnr
+            pkgs.icestorm
+            pkgs.gdb
+            pkgs.mosquitto
+            openocd
+            rustc
+            cargo
+            itm
+            runOpenOcdBlock
+            openocdFlash
+            publishMqtt
+            openOCDFlashCustomised
+        ];
+    }