blinky: erstes Pico-2W-Projekt + README mit Setup-Stolperern

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-07 21:36:41 +02:00
parent a4e49b3139
commit 95ffb6cecb
5 changed files with 137 additions and 0 deletions
@@ -1 +1,2 @@
 reference/*
+build/
@@ -0,0 +1,28 @@
+# Zum Bauen benötigt:
+
+## Toolchain
+- cmake
+- ninja
+- arm-none-eabi-gcc
+    - Cross-Platform Compiler
+    - auf Void Linux sind das: cross-arm-none-eabi-gcc cross-arm-none-eabi-newlib cross-arm-none-eabi-libstdc++
+    - libstdc++ wird gebraucht, weil das SDK intern einen C++-Stub (`new_delete.cpp`) mitkompiliert
+- picotool
+    - wird zur Build-Zeit gebraucht (UF2-Erzeugung); fehlt es, fetcht das SDK es selbst → Internet beim ersten Build nötig
+
+## SDK-Submodules
+- nach `git clone` der pico-sdk einmalig initialisieren:
+- `git submodule update --init --recursive`
+- ohne `lib/cyw43-driver` schaltet das SDK `pico_cyw43_arch` ab → `pico/cyw43_arch.h not found`
+
+## 3 Dateien im Projektordner
+- pico_sdk_import.cmake
+- CMakeLists.txt
+- project.c
+
+## Board-Variante definieren und bauen
+- PICO_BOARD=pico2_w
+- PICO_SDK_PATH=/pfad/zur/sdk/pico-sdk
+- cmake -S . -B build -G Ninja -DPICO_BOARD=pico2_w
+- cmake --build build
+- bei Wechsel von `PICO_BOARD` (oder kaputtem Cache): `rm -rf build` vor dem nächsten cmake-Aufruf
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+cmake_minimum_required(VERSION 3.13)
+
+include(pico_sdk_import.cmake)
+
+project(blinky C CXX ASM)
+
+pico_sdk_init()
+
+add_executable(blinky
+    blinky.c
+)
+
+target_link_libraries(blinky
+    pico_stdlib
+    pico_cyw43_arch_none
+)
+
+pico_add_extra_outputs(blinky)
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+#include "pico/stdlib.h"
+#include "pico/cyw43_arch.h"
+
+#define LED_DELAY_MS 250
+
+int main(void) {
+    if (cyw43_arch_init() != 0) {
+        return -1;
+    }
+
+    while (true) {
+        cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, true);
+        sleep_ms(LED_DELAY_MS);
+        cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, false);
+        sleep_ms(LED_DELAY_MS);
+    }
+}
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+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+            )
+        endif ()
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            FetchContent_Populate(pico_sdk)
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})