Generic peripheral bridge for the interdevice link

The RP2040 serves the ESP32 main firmware as a dumb bridge: I2C
transactions and bus scans execute on the local bus, GPS NMEA is
forwarded, and the SD card is exposed through chunked file transfers,
directory listings and card statistics. The link runs at 2M baud with
4KB chunks; message structs are static since they exceed the core
stack. SD init retries on demand, the slot has no card detect line.

Author: caveman99

.trunk/configs/.shellcheckrc

@@ -0,0 +1,7 @@
+enable=all
+source-path=SCRIPTDIR
+disable=SC2154
+
+# If you're having issues with shellcheck following source, disable the errors via:
+# disable=SC1090
+# disable=SC1091

.trunk/trunk.yaml

@@ -2,27 +2,31 @@
 # To learn more about the format of this file, see https://docs.trunk.io/reference/trunk-yaml
 version: 0.1
 cli:
-  version: 1.22.10
+  version: 1.24.0
 # Trunk provides extensibility via plugins. (https://docs.trunk.io/plugins)
 plugins:
   sources:
     - id: trunk
-      ref: v1.6.7
+      ref: v1.7.1
       uri: https://github.com/trunk-io/plugins
 # Many linters and tools depend on runtimes - configure them here. (https://docs.trunk.io/runtimes)
 runtimes:
   enabled:
-    - node@18.20.5
+    - go@1.21.0
+    - node@22.16.0
     - python@3.10.8
 # This is the section where you manage your linters. (https://docs.trunk.io/check/configuration)
 lint:
   enabled:
-    - markdownlint@0.44.0
-    - checkov@3.2.378
+    - oxipng@9.1.5
+    - shellcheck@0.10.0
+    - shfmt@3.6.0
+    - markdownlint@0.45.0
+    - checkov@3.2.447
     - git-diff-check
-    - prettier@3.5.2
-    - trufflehog@3.88.14
-    - yamllint@1.35.1
+    - prettier@3.6.2
+    - trufflehog@3.89.2
+    - yamllint@1.37.1
     - clang-format@16.0.3
 actions:
   disabled:

.vscode/extensions.json

@@ -1,7 +1,7 @@
 {
-    // See http://go.microsoft.com/fwlink/?LinkId=827846
-    // for the documentation about the extensions.json format
     "recommendations": [
+        "Jason2866.esp-decoder",
+        "pioarduino.pioarduino-ide",
         "platformio.platformio-ide"
     ],
     "unwantedRecommendations": [

.vscode/settings.json

@@ -0,0 +1,18 @@
+{
+  "files.associations": {
+    "random": "cpp",
+    "array": "cpp",
+    "deque": "cpp",
+    "list": "cpp",
+    "string": "cpp",
+    "unordered_map": "cpp",
+    "vector": "cpp",
+    "string_view": "cpp",
+    "format": "cpp",
+    "initializer_list": "cpp",
+    "span": "cpp",
+    "text_encoding": "cpp",
+    "regex": "cpp",
+    "chrono": "cpp"
+  }
+}

platformio.ini

@@ -1,40 +1,36 @@
-; PlatformIO Project Configuration File
-;
-;   Build options: build flags, source filter
-;   Upload options: custom upload port, speed and extra flags
-;   Library options: dependencies, extra library storages
-;   Advanced options: extra scripting
-;
-; Please visit documentation for the other options and examples
-; https://docs.platformio.org/page/projectconf.html
-
-[env:seeed_indicator_rp2040]
-platform = https://github.com/maxgerhardt/platform-raspberrypi.git#c7502925e3b08af70e9f924d54ab9d00a7e64781
-platform_packages = framework-arduinopico@https://github.com/earlephilhower/arduino-pico.git#4.4.4
-framework = arduino
-
-board = seeed_indicator_rp2040
-board_build.core = earlephilhower
-board_build.filesystem_size = 0.5m
-
-build_flags = 
-    -Wno-missing-field-initializers
-    -Wno-format
-    -Isrc
-    -Isrc/generated
-    -Wl,-Map,.pio/build/output.map
-    -Os
-    -Wno-unused-variable
-    -Wcast-align
-    -D__PLAT_RP2040__
-
-lib_deps = 
-    sensirion/Sensirion Core@0.7.1
-    sensirion/Sensirion I2C SCD4x@1.0.0
-    sensirion/Sensirion I2C SGP40@0.1.0
-    sensirion/Sensirion Gas Index Algorithm@3.2.3
-    nanopb/Nanopb@0.4.91
-    https://github.com/Seeed-Studio/Seeed_Arduino_AHT20.git#v1.0.1
-    
-
-monitor_speed = 115200
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:seeed_indicator_rp2040]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git#aa70b802be8851668053d4f09734e4089fe41932
+framework = arduino
+
+board = seeed_indicator_rp2040
+board_build.core = earlephilhower
+
+build_flags =
+    -Wno-missing-field-initializers
+    -Wno-format
+    -Isrc
+    -Wl,-Map,.pio/build/output.map
+    -Os
+    -Wno-unused-variable
+    -Wcast-align
+    -D__PLAT_RP2040__
+    -DDEBUG_RP2040_PORT=Serial
+    -DHW_SPI1_DEVICE
+
+lib_deps =
+    # renovate: datasource=custom.pio depName=Nanopb packageName=nanopb/library/Nanopb
+    nanopb/Nanopb@0.4.91
+
+monitor_speed = 115200
+
+debug_tool = cmsis-dap

protobufs

@@ -0,0 +1,10 @@
+#include "buzzer.h"
+
+ uint32_t buzz_off = 0;
+
+void beep_init(void) { pinMode(BUZZER_GPIO, OUTPUT); }
+void beep_off(void) { digitalWrite(BUZZER_GPIO, LOW); }
+void beep_on(uint32_t duration) {
+  analogWrite(BUZZER_GPIO, 127);
+  buzz_off = millis() + duration;
+}

src/buzzer.cpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#ifndef BUZZER_H
+#define BUZZER_H
+
+#define BUZZER_GPIO 19
+
+#include <Arduino.h>
+
+extern uint32_t buzz_off;
+
+void beep_init(void);
+void beep_off(void);
+void beep_on(uint32_t duration);
+
+#endif // BUZZER_H