Initial commit

.gitignore

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+.direnv/
+.devenv/

firmware/.envrc

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+watch_file default.nix
+use flake ..#firmware --override-input rootdir "file+file://"<(printf %s "$PWD")

firmware/.gitignore

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+/build/
+sdkconfig
+sdkconfig.old

firmware/CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(valconomy)

firmware/default.nix

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+{
+  perSystem = { libMy, pkgs, ... }: {
+    devenv.shells.firmware = libMy.withRootdir {
+      packages = with pkgs; [
+        esp-idf-esp32s3
+        picocom
+      ];
+
+      env = {
+        # PICO_SDK_PATH = "${pkgs.pico-sdk}/lib/pico-sdk";
+      };
+
+      scripts = {
+        # build.exec = ''
+        #   cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -D PICO_STDIO_SEMIHOSTING=1
+        #   cmake --build build --parallel
+        # '';
+        init.exec = ''
+          idf.py set-target esp32s3
+        '';
+      };
+    };
+  };
+}

firmware/main/CMakeLists.txt

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+idf_component_register(SRCS "valconomy.c"
+                    INCLUDE_DIRS ".")

firmware/main/valconomy.c

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+#include <stdio.h>
+#include <inttypes.h>
+
+#include "sdkconfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_chip_info.h"
+#include "esp_flash.h"
+#include "esp_system.h"
+
+void app_main(void) {
+  printf("Hello world!\n");
+
+  /* Print chip information */
+  esp_chip_info_t chip_info;
+  uint32_t flash_size;
+  esp_chip_info(&chip_info);
+  printf("This is %s chip with %d CPU core(s), %s%s%s%s, ",
+         CONFIG_IDF_TARGET,
+         chip_info.cores,
+         (chip_info.features & CHIP_FEATURE_WIFI_BGN) ? "WiFi/" : "",
+         (chip_info.features & CHIP_FEATURE_BT) ? "BT" : "",
+         (chip_info.features & CHIP_FEATURE_BLE) ? "BLE" : "",
+         (chip_info.features & CHIP_FEATURE_IEEE802154) ? ", 802.15.4 (Zigbee/Thread)" : "");
+
+  unsigned major_rev = chip_info.revision / 100;
+  unsigned minor_rev = chip_info.revision % 100;
+  printf("silicon revision v%d.%d, ", major_rev, minor_rev);
+  if(esp_flash_get_size(NULL, &flash_size) != ESP_OK) {
+    printf("Get flash size failed");
+    return;
+  }
+
+  printf("%" PRIu32 "MB %s flash\n", flash_size / (uint32_t)(1024 * 1024),
+         (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");
+
+  printf("Minimum free heap size: %" PRIu32 " bytes\n", esp_get_minimum_free_heap_size());
+
+  for (int i = 10; i >= 0; i--) {
+    printf("Restarting in %d seconds...\n", i);
+    vTaskDelay(1000 / portTICK_PERIOD_MS);
+  }
+  printf("Restarting now.\n");
+  fflush(stdout);
+  esp_restart();
+}

firmware/sdkconfig.defaults

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+# This file was generated using idf.py save-defconfig. It can be edited manually.
+# Espressif IoT Development Framework (ESP-IDF) 5.3.1 Project Minimal Configuration
+#
+CONFIG_ESP_WIFI_DPP_SUPPORT=y

flake.nix

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+{
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    devenv.url = "github:cachix/devenv";
+    devenv.inputs.nixpkgs.follows = "nixpkgs";
+
+    esp-dev.url = "github:mirrexagon/nixpkgs-esp-dev";
+    esp-dev.inputs.nixpkgs.follows = "nixpkgs";
+
+    rootdir = {
+      url = "file+file:///dev/null";
+      flake = false;
+    };
+  };
+
+  outputs = inputs@{ nixpkgs, flake-parts, devenv, esp-dev, rootdir, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        devenv.flakeModule
+
+        ./firmware
+      ];
+      systems = [ "x86_64-linux" ];
+
+      perSystem = { inputs', system, lib, pkgs, config, ... }:
+      let
+        inherit (lib) mkMerge;
+
+        rootdirOpt =
+          let
+            rootFileContent = builtins.readFile rootdir.outPath;
+          in
+          pkgs.lib.mkIf (rootFileContent != "") rootFileContent;
+      in
+      {
+        _module.args = {
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [
+              esp-dev.overlays.default
+            ];
+          };
+
+          libMy = {
+            withRootdir = c: mkMerge [
+              c
+              { devenv.root = rootdirOpt; }
+            ];
+          };
+        };
+      };
+    };
+}