commit fe2b2c2e2bbe23d25cf10d3bdb36d94f22a3d210 Author: Adolfo Reyna Date: Mon Nov 17 23:34:35 2025 -0500 initial example diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..2435c20 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +build +!.vscode/* diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json new file mode 100644 index 0000000..0a6cd5a --- /dev/null +++ b/.vscode/c_cpp_properties.json @@ -0,0 +1,22 @@ +{ + "configurations": [ + { + "name": "Pico", + "includePath": [ + "${workspaceFolder}/**", + "${userHome}/.pico-sdk/sdk/2.2.0/**" + ], + "forcedInclude": [ + "${workspaceFolder}/build/generated/pico_base/pico/config_autogen.h", + "${userHome}/.pico-sdk/sdk/2.2.0/src/common/pico_base_headers/include/pico.h" + ], + "defines": [], + "compilerPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc", + "compileCommands": "${workspaceFolder}/build/compile_commands.json", + "cStandard": "c17", + "cppStandard": "c++14", + "intelliSenseMode": "linux-gcc-arm" + } + ], + "version": 4 +} diff --git a/.vscode/cmake-kits.json b/.vscode/cmake-kits.json new file mode 100644 index 0000000..b0f3815 --- /dev/null +++ b/.vscode/cmake-kits.json @@ -0,0 +1,15 @@ +[ + { + "name": "Pico", + "compilers": { + "C": "${command:raspberry-pi-pico.getCompilerPath}", + "CXX": "${command:raspberry-pi-pico.getCxxCompilerPath}" + }, + "environmentVariables": { + "PATH": "${command:raspberry-pi-pico.getEnvPath};${env:PATH}" + }, + "cmakeSettings": { + "Python3_EXECUTABLE": "${command:raspberry-pi-pico.getPythonPath}" + } + } +] \ No newline at end of file diff --git a/.vscode/extensions.json b/.vscode/extensions.json new file mode 100644 index 0000000..a940d7c --- /dev/null +++ b/.vscode/extensions.json @@ -0,0 +1,9 @@ +{ + "recommendations": [ + "marus25.cortex-debug", + "ms-vscode.cpptools", + "ms-vscode.cpptools-extension-pack", + "ms-vscode.vscode-serial-monitor", + "raspberry-pi.raspberry-pi-pico" + ] +} \ No newline at end of file diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 0000000..424aa71 --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,50 @@ +{ + "version": "0.2.0", + "configurations": [ + { + "name": "Pico Debug (Cortex-Debug)", + "cwd": "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts", + "executable": "${command:raspberry-pi-pico.launchTargetPath}", + "request": "launch", + "type": "cortex-debug", + "servertype": "openocd", + "serverpath": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe", + "gdbPath": "${command:raspberry-pi-pico.getGDBPath}", + "device": "${command:raspberry-pi-pico.getChipUppercase}", + "configFiles": [ + "interface/cmsis-dap.cfg", + "target/${command:raspberry-pi-pico.getTarget}.cfg" + ], + "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd", + "runToEntryPoint": "main", + // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected + // Also works fine for flash binaries + "overrideLaunchCommands": [ + "monitor reset init", + "load \"${command:raspberry-pi-pico.launchTargetPath}\"" + ], + "openOCDLaunchCommands": [ + "adapter speed 5000" + ] + }, + { + "name": "Pico Debug (Cortex-Debug with external OpenOCD)", + "cwd": "${workspaceRoot}", + "executable": "${command:raspberry-pi-pico.launchTargetPath}", + "request": "launch", + "type": "cortex-debug", + "servertype": "external", + "gdbTarget": "localhost:3333", + "gdbPath": "${command:raspberry-pi-pico.getGDBPath}", + "device": "${command:raspberry-pi-pico.getChipUppercase}", + "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd", + "runToEntryPoint": "main", + // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected + // Also works fine for flash binaries + "overrideLaunchCommands": [ + "monitor reset init", + "load \"${command:raspberry-pi-pico.launchTargetPath}\"" + ] + }, + ] +} diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 0000000..95be83b --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,40 @@ +{ + "cmake.showSystemKits": false, + "cmake.options.statusBarVisibility": "hidden", + "cmake.options.advanced": { + "build": { + "statusBarVisibility": "hidden" + }, + "launch": { + "statusBarVisibility": "hidden" + }, + "debug": { + "statusBarVisibility": "hidden" + } + }, + "cmake.configureOnEdit": false, + "cmake.automaticReconfigure": false, + "cmake.configureOnOpen": false, + "cmake.generator": "Ninja", + "cmake.cmakePath": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake", + "C_Cpp.debugShortcut": false, + "terminal.integrated.env.windows": { + "PICO_SDK_PATH": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0", + "PICO_TOOLCHAIN_PATH": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1", + "Path": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin;${env:USERPROFILE}/.pico-sdk/picotool/2.2.0-a4/picotool;${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin;${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1;${env:PATH}" + }, + "terminal.integrated.env.osx": { + "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0", + "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1", + "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0-a4/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}" + }, + "terminal.integrated.env.linux": { + "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0", + "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1", + "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0-a4/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}" + }, + "raspberry-pi-pico.cmakeAutoConfigure": true, + "raspberry-pi-pico.useCmakeTools": false, + "raspberry-pi-pico.cmakePath": "${HOME}/.pico-sdk/cmake/v3.31.5/bin/cmake", + "raspberry-pi-pico.ninjaPath": "${HOME}/.pico-sdk/ninja/v1.12.1/ninja" +} diff --git a/.vscode/tasks.json b/.vscode/tasks.json new file mode 100644 index 0000000..d1b3193 --- /dev/null +++ b/.vscode/tasks.json @@ -0,0 +1,102 @@ +{ + "version": "2.0.0", + "tasks": [ + { + "label": "Compile Project", + "type": "process", + "isBuildCommand": true, + "command": "${userHome}/.pico-sdk/ninja/v1.12.1/ninja", + "args": ["-C", "${workspaceFolder}/build"], + "group": "build", + "presentation": { + "reveal": "always", + "panel": "dedicated" + }, + "problemMatcher": "$gcc", + "windows": { + "command": "${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1/ninja.exe" + } + }, + { + "label": "Run Project", + "type": "process", + "command": "${env:HOME}/.pico-sdk/picotool/2.2.0-a4/picotool/picotool", + "args": [ + "load", + "${command:raspberry-pi-pico.launchTargetPath}", + "-fx" + ], + "presentation": { + "reveal": "always", + "panel": "dedicated" + }, + "problemMatcher": [], + "windows": { + "command": "${env:USERPROFILE}/.pico-sdk/picotool/2.2.0-a4/picotool/picotool.exe" + } + }, + { + "label": "Flash", + "type": "process", + "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe", + "args": [ + "-s", + "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts", + "-f", + "interface/cmsis-dap.cfg", + "-f", + "target/${command:raspberry-pi-pico.getTarget}.cfg", + "-c", + "adapter speed 5000; program \"${command:raspberry-pi-pico.launchTargetPath}\" verify reset exit" + ], + "problemMatcher": [], + "windows": { + "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe", + } + }, + { + "label": "Rescue Reset", + "type": "process", + "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe", + "args": [ + "-s", + "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts", + "-f", + "interface/cmsis-dap.cfg", + "-f", + "target/${command:raspberry-pi-pico.getChip}-rescue.cfg", + "-c", + "adapter speed 5000; reset halt; exit" + ], + "problemMatcher": [], + "windows": { + "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe", + } + }, + { + "label": "RISC-V Reset (RP2350)", + "type": "process", + "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe", + "args": [ + "-s", + "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts", + "-c", + "set USE_CORE { rv0 rv1 cm0 cm1 }", + "-f", + "interface/cmsis-dap.cfg", + "-f", + "target/rp2350.cfg", + "-c", + "adapter speed 5000; init;", + "-c", + "write_memory 0x40120158 8 { 0x3 }; echo [format \"Info : ARCHSEL 0x%02x\" [read_memory 0x40120158 8 1]];", + "-c", + "reset halt; targets rp2350.rv0; echo [format \"Info : ARCHSEL_STATUS 0x%02x\" [read_memory 0x4012015C 8 1]]; exit" + ], + "problemMatcher": [], + "windows": { + "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe", + } + } + ] +} diff --git a/CMakeLists.txt b/CMakeLists.txt new file mode 100644 index 0000000..704a560 --- /dev/null +++ b/CMakeLists.txt @@ -0,0 +1,56 @@ +# Generated Cmake Pico project file + +cmake_minimum_required(VERSION 3.13) + +set(CMAKE_C_STANDARD 11) +set(CMAKE_CXX_STANDARD 17) +set(CMAKE_EXPORT_COMPILE_COMMANDS ON) + +# Initialise pico_sdk from installed location +# (note this can come from environment, CMake cache etc) + +# == DO NOT EDIT THE FOLLOWING LINES for the Raspberry Pi Pico VS Code Extension to work == +if(WIN32) + set(USERHOME $ENV{USERPROFILE}) +else() + set(USERHOME $ENV{HOME}) +endif() +set(sdkVersion 2.2.0) +set(toolchainVersion 14_2_Rel1) +set(picotoolVersion 2.2.0-a4) +set(picoVscode ${USERHOME}/.pico-sdk/cmake/pico-vscode.cmake) +if (EXISTS ${picoVscode}) + include(${picoVscode}) +endif() +# ==================================================================================== +set(PICO_BOARD pico_w CACHE STRING "Board type") + +# Pull in Raspberry Pi Pico SDK (must be before project) +include(pico_sdk_import.cmake) + +project(hello_usb C CXX ASM) + +# Initialise the Raspberry Pi Pico SDK +pico_sdk_init() + +# Add executable. Default name is the project name, version 0.1 + +if (TARGET tinyusb_device) + add_executable(hello_usb + hello_usb.c + ) + + # pull in common dependencies + target_link_libraries(hello_usb pico_stdlib) + + # enable usb output, disable uart output + pico_enable_stdio_usb(hello_usb 1) + pico_enable_stdio_uart(hello_usb 0) + + # create map/bin/hex/uf2 file etc. + pico_add_extra_outputs(hello_usb) + + # add url via pico_set_program_url +elseif(PICO_ON_DEVICE) + message("Skipping hello_usb because TinyUSB submodule is not initialized in the SDK") +endif() diff --git a/hello_usb.c b/hello_usb.c new file mode 100644 index 0000000..f5c56f6 --- /dev/null +++ b/hello_usb.c @@ -0,0 +1,135 @@ +/** + * Simple USB Serial Echo Program with Timeout, Reconnect, and Backspace Logic. + * This program now correctly handles the backspace character by deleting it + * from the buffer and sending the necessary control codes to the terminal + * for visual deletion. + */ + +#include "pico/stdlib.h" +#include "pico/time.h" // Needed for time_us_64() +#include +#include + +// Define the maximum size for the input string buffer +#define MAX_INPUT_LEN 64 +// Define the timeout period: 1 second in microseconds +#define TIMEOUT_US 5000000 +// ASCII code for Backspace (often sent as 0x08) +#define ASCII_BACKSPACE 8 + +// Helper function to handle the echoing and resetting of the buffer +void echo_and_reset(char* buffer, int* index_ptr) { + if (*index_ptr > 0) { + // Null-terminate the string + buffer[*index_ptr] = '\0'; + + // Echo the string back, converting to uppercase + printf("\nEchoed (ALL CAPS): "); + for (int i = 0; buffer[i] != '\0'; i++) { + printf("%c", toupper(buffer[i])); + } + printf("\n"); + } + + // Reset buffer for next line and print a new prompt + *index_ptr = 0; + printf("> "); +} + +// Function to handle the initial waiting and reconnect waiting +void wait_for_usb_connection() { + printf("Waiting for USB host to connect...\n"); + // Wait until the USB host (e.g., terminal program) opens the serial port + while (!stdio_usb_connected()) { + sleep_ms(100); + } + // Connection established! + printf("\nConnection Established! Starting Echo Session...\n"); +} + +void run_echo_session() { + char input_buffer[MAX_INPUT_LEN]; + int buffer_index = 0; + // Track the time (in microseconds) when the last character was received + uint64_t last_char_time = time_us_64(); + + printf("--- Pico USB String Echo Program Started ---\n"); + printf("Type a sentence (up to %d chars). It will echo on Enter/Timeout.\n", MAX_INPUT_LEN - 2); + printf("--------------------------------------------\n"); + printf("> "); // Prompt for input + + // Inner loop runs ONLY while the USB connection is active + while (stdio_usb_connected()) { + + // Check for incoming character without blocking + int c = getchar_timeout_us(0); + + if (c != PICO_ERROR_TIMEOUT) { + + // Character received, update the timer + last_char_time = time_us_64(); + char input_char = (char)c; + + // 1. --- BACKSPACE HANDLING --- + if (input_char == ASCII_BACKSPACE || input_char == 127) { // 127 is sometimes sent by terminals (DEL key) + if (buffer_index > 0) { + // Decrease buffer index (remove the character) + buffer_index--; + // Send backspace, space, and backspace to erase the character on the terminal: + // \b: move cursor back + // ' ': overwrite with a space + // \b: move cursor back again, ready for the next character + printf("\b \b"); + } + // 2. --- End of Input (Newline/CR) --- + } else if (input_char == '\r' || input_char == '\n') { + echo_and_reset(input_buffer, &buffer_index); + + // 3. --- Collect regular characters --- + } else if (buffer_index < (MAX_INPUT_LEN - 1) && isprint(input_char)) { + + // Echo character locally so the user sees what they type + printf("%c", input_char); + + // Store character in the buffer + input_buffer[buffer_index] = input_char; + buffer_index++; + } + // Ignore non-printable characters and overflowed buffer input + } + + // 4. Timeout Check + if (buffer_index > 0 && (time_us_64() - last_char_time) > TIMEOUT_US) { + printf("\n--- Timeout Reached (5.0s silence) ---\n"); + echo_and_reset(input_buffer, &buffer_index); + last_char_time = time_us_64(); // Reset time to prevent immediate re-trigger + } + + // Add a small delay to prevent the loop from consuming too much CPU time + sleep_us(100); + } + + // Connection lost or closed by host + printf("\nHost disconnected. Ending Echo Session.\n"); +} + + +int main() { + // Initialize Standard I/O (stdio) to use the USB backend + stdio_init_all(); + + // Outer loop: Allows the program to run continuously and restart the + // session after a disconnection. + while (true) { + + // 1. Wait for a connection + wait_for_usb_connection(); + + // 2. Run the program logic while connected + run_echo_session(); + + // Loop repeats, going back to wait_for_usb_connection() + } + + // Note: main should not return +} \ No newline at end of file diff --git a/pico_sdk_import.cmake b/pico_sdk_import.cmake new file mode 100644 index 0000000..d493cc2 --- /dev/null +++ b/pico_sdk_import.cmake @@ -0,0 +1,121 @@ +# This is a copy of /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() + +# Copyright 2020 (c) 2020 Raspberry Pi (Trading) Ltd. +# +# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the +# following conditions are met: +# +# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following +# disclaimer. +# +# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following +# disclaimer in the documentation and/or other materials provided with the distribution. +# +# 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products +# derived from this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, +# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, +# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +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 () + +if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG)) + set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG}) + message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')") +endif () + +if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG) + set(PICO_SDK_FETCH_FROM_GIT_TAG "master") + message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG") +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 "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK") +set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for 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 () + FetchContent_Declare( + pico_sdk + GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk + GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG} + ) + + if (NOT pico_sdk) + message("Downloading Raspberry Pi Pico SDK") + # GIT_SUBMODULES_RECURSE was added in 3.17 + if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0") + FetchContent_Populate( + pico_sdk + QUIET + GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk + GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG} + GIT_SUBMODULES_RECURSE FALSE + + SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src + BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build + SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild + ) + else () + FetchContent_Populate( + pico_sdk + QUIET + GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk + GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG} + + SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src + BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build + SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild + ) + endif () + + 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})