Initial version, HID and vendor echo working

2025-12-09 16:24:31 -08:00 · 2025-01-31 01:21:03 -08:00
commit 90c38b731e
20 changed files with 932 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,2 @@
+build
+compile_commands.json
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "pico-sdk"]
+	path = pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk.git
--- a/.vscode/c_cpp_properties.json
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,22 @@
+{
+    "configurations": [
+        {
+            "name": "Pico",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${userHome}/.pico-sdk/sdk/2.1.0/**"
+            ],
+            "forcedInclude": [
+                "${userHome}/.pico-sdk/sdk/2.1.0/src/common/pico_base_headers/include/pico.h",
+                "${workspaceFolder}/build/generated/pico_base/pico/config_autogen.h"
+            ],
+            "defines": [],
+            "compilerPath": "${userHome}/.pico-sdk/toolchain/13_3_Rel1/bin/arm-none-eabi-gcc",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
+            "cStandard": "c17",
+            "cppStandard": "c++14",
+            "intelliSenseMode": "linux-gcc-arm"
+        }
+    ],
+    "version": 4
+}
--- a/.vscode/cmake-kits.json
+++ 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": "${command:raspberry-pi-pico.getPythonPath}"
+        }
+    }
+]
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "marus25.cortex-debug",
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "ms-vscode.vscode-serial-monitor",
+        "raspberry-pi.raspberry-pi-pico"
+    ]
+}
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -0,0 +1,70 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Pico Debug (Cortex-Debug)",
+            "cwd": "${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/2.1.0/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/2.1.0/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 \"${command:raspberry-pi-pico.launchTargetPath}\""
+            ]
+        },
+        {
+            "name": "Pico Debug (C++ Debugger)",
+            "type": "cppdbg",
+            "request": "launch",
+            "cwd": "${workspaceRoot}",
+            "program": "${command:raspberry-pi-pico.launchTargetPath}",
+            "MIMode": "gdb",
+            "miDebuggerPath": "${command:raspberry-pi-pico.getGDBPath}",
+            "miDebuggerServerAddress": "localhost:3333",
+            "debugServerPath": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "debugServerArgs": "-f interface/cmsis-dap.cfg -f target/${command:raspberry-pi-pico.getTarget}.cfg -c \"adapter speed 5000\"",
+            "serverStarted": "Listening on port .* for gdb connections",
+            "filterStderr": true,
+            "hardwareBreakpoints": {
+                "require": true,
+                "limit": 4
+            },
+            "preLaunchTask": "Flash",
+            "svdPath": "${userHome}/.pico-sdk/sdk/2.1.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd"
+        },
+    ]
+}
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -0,0 +1,39 @@
+{
+    "cmake.options.statusBarVisibility": "hidden",
+    "cmake.options.advanced": {
+        "build": {
+            "statusBarVisibility": "hidden"
+        },
+        "launch": {
+            "statusBarVisibility": "hidden"
+        },
+        "debug": {
+            "statusBarVisibility": "hidden"
+        }
+    },
+    "cmake.configureOnEdit": false,
+    "cmake.automaticReconfigure": false,
+    "cmake.configureOnOpen": false,
+    "cmake.generator": "Ninja",
+    "cmake.cmakePath": "${userHome}/.pico-sdk/cmake/v3.29.9/bin/cmake",
+    "C_Cpp.debugShortcut": false,
+    "terminal.integrated.env.windows": {
+        "PICO_SDK_PATH": "${env:USERPROFILE}/.pico-sdk/sdk/2.1.0",
+        "PICO_TOOLCHAIN_PATH": "${env:USERPROFILE}/.pico-sdk/toolchain/13_3_Rel1",
+        "Path": "${env:USERPROFILE}/.pico-sdk/toolchain/13_3_Rel1/bin;${env:USERPROFILE}/.pico-sdk/picotool/2.1.0/picotool;${env:USERPROFILE}/.pico-sdk/cmake/v3.29.9/bin;${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1;${env:PATH}"
+    },
+    "terminal.integrated.env.osx": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.1.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/13_3_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/13_3_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.1.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.29.9/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "terminal.integrated.env.linux": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.1.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/13_3_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/13_3_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.1.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.29.9/bin:${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/v3.29.9/bin/cmake",
+    "raspberry-pi-pico.ninjaPath": "${HOME}/.pico-sdk/ninja/v1.12.1/ninja"
+}
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -0,0 +1,58 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Compile Project",
+            "type": "process",
+            "isBuildCommand": true,
+            "command": "${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/2.1.0/picotool/picotool",
+            "args": [
+                "load",
+                "${command:raspberry-pi-pico.launchTargetPath}",
+                "-fx"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/picotool/2.1.0/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",
+            }
+        }
+    ]
+}
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -0,0 +1,52 @@
+# == 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 2.1.0)
+set(toolchainVersion 13_3_Rel1)
+set(picotoolVersion 2.1.0)
+set(picoVscode ${USERHOME}/.pico-sdk/cmake/pico-vscode.cmake)
+if (EXISTS ${picoVscode})
+    include(${picoVscode})
+endif()
+# ====================================================================================
+set(PICO_BOARD pico CACHE STRING "Board type")
+
+cmake_minimum_required(VERSION 3.12)
+
+set(PICO_SDK_PATH ${CMAKE_SOURCE_DIR}/pico-sdk)
+include(pico_sdk_import.cmake)
+
+project(EDMFD C CXX)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+set(PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS 3000)
+pico_sdk_init()
+
+add_compile_options(
+    -Wall
+    -Wno-format          # int != int32_t as far as the compiler is concerned because gcc has int32_t as long int
+    -Wno-unused-function # we have some for the docs that aren't called
+    )
+
+if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    add_compile_options(-Wno-maybe-uninitialized)
+endif()
+
+add_executable(edmfd)
+target_include_directories(edmfd PUBLIC src)
+target_sources(edmfd PUBLIC
+    src/blink.cc
+    src/hid.cc
+    src/main.cc
+    src/usb_descriptors.cc
+    src/vendor.cc
+    )
+
+pico_enable_stdio_usb(edmfd 1)
+pico_add_extra_outputs(edmfd)
+target_link_libraries(edmfd PUBLIC pico_stdlib pico_unique_id tinyusb_device tinyusb_board)
--- a/1
+++ b/1
--- a/pico_sdk_import.cmake
+++ b/pico_sdk_import.cmake
@@ -0,0 +1,84 @@
+# 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 ()
+
+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 "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+            )
+        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})
--- a/src/blink.cc
+++ b/src/blink.cc
@@ -0,0 +1,42 @@
+#include "bsp/board_api.h"
+#include "blink.hh"
+
+namespace blink {
+namespace {
+    // Durations unit are multiples of 25ms
+    static constexpr uint16_t unit = 25;
+    const uint8_t pattern_defs[size_t(pattern::_count)-2][2] = {
+        // off,   on
+        { 100,  20},     // suspended
+        {  20,  20},     // not_mounted
+        {  40,   1},     // mounted
+        {   1,   1},     // transmit
+    };
+    pattern current_pattern = pattern::off;
+    uint32_t next_change = 0;
+    bool led_state = false;
+
+    inline const uint16_t get_duration(pattern p, bool on) { 
+        if (p <= pattern::on) return 0;
+        return unit * pattern_defs[static_cast<uint8_t>(p)-2][on];
+    }
+}
+
+void set_pattern(pattern pat) {
+    if (pat == current_pattern) return;
+    led_state = (pat == pattern::on);
+    next_change = board_millis() + get_duration(pat, led_state);
+    current_pattern = pat;
+    board_led_write(led_state);
+}
+
+void task(uint32_t time) {
+    if (current_pattern == pattern::off || time < next_change)
+        return;
+
+    led_state = !led_state;
+    next_change = time + get_duration(current_pattern, led_state);
+    board_led_write(led_state);
+}
+
+} // namespace blink
--- a/src/blink.hh
+++ b/src/blink.hh
@@ -0,0 +1,19 @@
+#pragma once
+#include <stdint.h>
+
+namespace blink {
+
+enum class pattern : uint8_t {
+    off,
+    on,
+    suspended,
+    not_mounted,
+    mounted,
+    transmit,
+    _count,
+};
+
+void set_pattern(pattern pat);
+void task(uint32_t time);
+
+} // namespace blink
--- a/src/hid.cc
+++ b/src/hid.cc
@@ -0,0 +1,131 @@
+#include "bsp/board_api.h"
+
+#include "blink.hh"
+#include "hid.hh"
+#include "usb_descriptors.hh"
+#include "hid/hid_device.h"
+
+extern "C" {
+    // TinyUSB Callbacks
+    void tud_hid_report_complete_cb(uint8_t, uint8_t const*, uint16_t);
+    uint16_t tud_hid_get_report_cb(uint8_t, uint8_t, hid_report_type_t, uint8_t*, uint16_t);
+    void tud_hid_set_report_cb(uint8_t, uint8_t, hid_report_type_t, uint8_t const*, uint16_t);
+}
+
+namespace hid {
+
+void send_report(descriptor desc, uint32_t btn)
+{
+    // skip if hid is not ready yet
+    if ( !tud_hid_ready() ) return;
+
+    switch(desc)
+    {
+        case descriptor::gamepad: {
+            // use to avoid send multiple consecutive zero report for keyboard
+            static bool has_gamepad_key = false;
+
+            hid_gamepad_report_t report = {
+                .x   = 0, .y = 0, .z = 0, .rz = 0, .rx = 0, .ry = 0,
+                .hat = 0, .buttons = 0
+            };
+
+            if ( btn ) {
+                report.hat = GAMEPAD_HAT_UP;
+                report.buttons = GAMEPAD_BUTTON_A;
+                tud_hid_report(static_cast<uint8_t>(desc), &report, sizeof(report));
+                has_gamepad_key = true;
+            } else {
+                report.hat = GAMEPAD_HAT_CENTERED;
+                report.buttons = 0;
+                if (has_gamepad_key) tud_hid_report(static_cast<uint8_t>(desc), &report, sizeof(report));
+                has_gamepad_key = false;
+            }
+        }
+        break;
+
+        default: break;
+    }
+}
+
+// Every 10ms, we will sent 1 report for each HID profile (keyboard, mouse etc ..)
+// tud_hid_report_complete_cb() is used to send the next report after previous one is complete
+void task(uint32_t time)
+{
+    // Poll every 10ms
+    static constexpr uint32_t interval_ms = 10;
+    static uint32_t next_update = 0;
+
+    if (time < next_update) return; // not enough time
+    next_update = time + interval_ms;
+
+    uint32_t const btn = board_button_read();
+
+    // Remote wakeup
+    if ( tud_suspended() && btn )
+    {
+        // Wake up host if we are in suspend mode
+        // and REMOTE_WAKEUP feature is enabled by host
+        tud_remote_wakeup();
+    }else
+    {
+        // Send the 1st of report chain, the rest will be sent by tud_hid_report_complete_cb()
+        send_report(descriptor::gamepad, btn);
+    }
+}
+
+} // namespace hid
+
+// Invoked when sent REPORT successfully to host
+// Application can use this to send the next report
+// Note: For composite reports, report[0] is report ID
+void tud_hid_report_complete_cb(uint8_t instance, uint8_t const* report, uint16_t len)
+{
+    (void) instance;
+    (void) len;
+
+    auto next_report_id = descriptor(report[0] + 1u);
+    if (next_report_id < descriptor::_count) {
+        hid::send_report(next_report_id, board_button_read());
+    }
+}
+
+// Invoked when received GET_REPORT control request
+// Application must fill buffer report's content and return its length.
+// Return zero will cause the stack to STALL request
+uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen)
+{
+    // TODO not Implemented
+    (void) instance;
+    (void) report_id;
+    (void) report_type;
+    (void) buffer;
+    (void) reqlen;
+
+    return 0;
+}
+
+// Invoked when received SET_REPORT control request or
+// received data on OUT endpoint ( Report ID = 0, Type = 0 )
+void tud_hid_set_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)
+{
+    (void) instance;
+    const auto desc = descriptor(report_id);
+
+    if (report_type == HID_REPORT_TYPE_OUTPUT) {
+        // Set button LEDs
+        if (desc == descriptor::gamepad) {
+            // bufsize should be (at least) 1
+            if ( bufsize < 1 ) return;
+
+            uint8_t const btn_leds = buffer[0];
+            if (btn_leds & 1) {
+                // Capslock On: disable blink, turn led on
+                blink::set_pattern(blink::pattern::on);
+            } else {
+                // Caplocks Off: back to normal blink
+                blink::set_pattern(blink::pattern::mounted);
+            }
+        }
+    }
+}
--- a/src/hid.hh
+++ b/src/hid.hh
@@ -0,0 +1,7 @@
+#pragma once
+
+namespace hid {
+
+void task(uint32_t time);
+
+} // namespace hid
--- a/src/main.cc
+++ b/src/main.cc
@@ -0,0 +1,88 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "tusb_config.h"
+#include "bsp/board_api.h"
+#include "tusb.h"
+
+#include "blink.hh"
+#include "hid.hh"
+
+extern "C" {
+    // TinyUSB callbacks
+    void tud_mount_cb();
+    void tud_unmount_cb();
+    void tud_suspend_cb(bool);
+    void tud_resume_cb();
+}
+
+extern "C"
+int main(void)
+{
+    board_init();
+
+    tud_init(BOARD_TUD_RHPORT);
+
+    if (board_init_after_tusb)
+        board_init_after_tusb();
+
+    while (1) {
+        uint32_t time = board_millis();
+        tud_task(); // tinyusb device task
+        blink::task(time);
+        hid::task(time);
+    }
+}
+
+//--------------------------------------------------------------------+
+// Device callbacks
+//--------------------------------------------------------------------+
+
+// Invoked when device is mounted
+void tud_mount_cb() {
+    blink::set_pattern(blink::pattern::mounted);
+}
+
+// Invoked when device is unmounted
+void tud_umount_cb() {
+    blink::set_pattern(blink::pattern::not_mounted);
+}
+
+// Invoked when usb bus is suspended
+// argumen : if host allow us  to perform remote wakeup
+// Within 7ms, device must draw an average of current less than 2.5 mA from bus
+void tud_suspend_cb(bool) {
+    blink::set_pattern(blink::pattern::suspended);
+}
+
+// Invoked when usb bus is resumed
+void tud_resume_cb() {
+    blink::pattern pat = tud_mounted() ? blink::pattern::mounted : blink::pattern::not_mounted;
+    blink::set_pattern(pat);
+}
--- a/src/tusb_config.h
+++ b/src/tusb_config.h
@@ -0,0 +1,110 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#ifndef _TUSB_CONFIG_H_
+#define _TUSB_CONFIG_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Board Specific Configuration
+//--------------------------------------------------------------------+
+
+// RHPort number used for device can be defined by board.mk, default to port 0
+#ifndef BOARD_TUD_RHPORT
+#define BOARD_TUD_RHPORT      0
+#endif
+
+// RHPort max operational speed can defined by board.mk
+#ifndef BOARD_TUD_MAX_SPEED
+#define BOARD_TUD_MAX_SPEED   OPT_MODE_DEFAULT_SPEED
+#endif
+
+//--------------------------------------------------------------------
+// COMMON CONFIGURATION
+//--------------------------------------------------------------------
+
+// defined by compiler flags for flexibility
+#ifndef CFG_TUSB_MCU
+#error CFG_TUSB_MCU must be defined
+#endif
+
+#ifndef CFG_TUSB_OS
+#define CFG_TUSB_OS           OPT_OS_NONE
+#endif
+
+#ifndef CFG_TUSB_DEBUG
+#define CFG_TUSB_DEBUG        0
+#endif
+
+// Enable Device stack
+#define CFG_TUD_ENABLED       1
+
+// Default is max speed that hardware controller could support with on-chip PHY
+#define CFG_TUD_MAX_SPEED     BOARD_TUD_MAX_SPEED
+
+/* USB DMA on some MCUs can only access a specific SRAM region with restriction on alignment.
+ * Tinyusb use follows macros to declare transferring memory so that they can be put
+ * into those specific section.
+ * e.g
+ * - CFG_TUSB_MEM SECTION : __attribute__ (( section(".usb_ram") ))
+ * - CFG_TUSB_MEM_ALIGN   : __attribute__ ((aligned(4)))
+ */
+#ifndef CFG_TUSB_MEM_SECTION
+#define CFG_TUSB_MEM_SECTION
+#endif
+
+#ifndef CFG_TUSB_MEM_ALIGN
+#define CFG_TUSB_MEM_ALIGN          __attribute__ ((aligned(4)))
+#endif
+
+//--------------------------------------------------------------------
+// DEVICE CONFIGURATION
+//--------------------------------------------------------------------
+
+#ifndef CFG_TUD_ENDPOINT0_SIZE
+#define CFG_TUD_ENDPOINT0_SIZE    64
+#endif
+
+//------------- CLASS -------------//
+#define CFG_TUD_HID               1
+#define CFG_TUD_CDC               0
+#define CFG_TUD_MSC               0
+#define CFG_TUD_MIDI              0
+#define CFG_TUD_VENDOR            1
+
+// HID buffer size Should be sufficient to hold ID (if any) + Data
+#define CFG_TUD_HID_EP_BUFSIZE    16
+
+#define CFG_TUD_VENDOR_TX_BUFSIZE 64
+#define CFG_TUD_VENDOR_RX_BUFSIZE 64
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_CONFIG_H_ */
--- a/src/usb_descriptors.cc
+++ b/src/usb_descriptors.cc
@@ -0,0 +1,154 @@
+#include "bsp/board_api.h"
+#include "tusb.h"
+#include "usb_descriptors.hh"
+
+/* A combination of interfaces must have a unique product id, since PC will save device driver after the first plug.
+ * Same VID/PID with different interface e.g MSC (first), then CDC (later) will possibly cause system error on PC.
+ *
+ * Auto ProductID layout's Bitmap:
+ *   [MSB]         HID | MSC | CDC          [LSB]
+ */
+#define _PID_MAP(itf, n)  ( (CFG_TUD_##itf) << (n) )
+#define USB_PID           (0x0000 | _PID_MAP(CDC, 0) | _PID_MAP(MSC, 1) | _PID_MAP(HID, 2) | \
+                           _PID_MAP(MIDI, 3) | _PID_MAP(VENDOR, 4) )
+
+#define USB_VID   0x4a33 // J3 in ascii
+#define USB_BCD   0x0200
+
+extern "C" {
+    // TinyUSB callbacks
+    uint8_t const * tud_descriptor_device_cb();
+    uint8_t const * tud_hid_descriptor_report_cb(uint8_t);
+    uint8_t const * tud_descriptor_configuration_cb(uint8_t);
+    uint16_t const * tud_descriptor_string_cb(uint8_t, uint16_t);
+}
+
+//--------------------------------------------------------------------+
+// Device Descriptors
+//--------------------------------------------------------------------+
+tusb_desc_device_t const desc_device = {
+    .bLength            = sizeof(tusb_desc_device_t),
+    .bDescriptorType    = TUSB_DESC_DEVICE,
+    .bcdUSB             = USB_BCD,
+    .bDeviceClass       = TUSB_CLASS_MISC,
+    .bDeviceSubClass    = MISC_SUBCLASS_COMMON,
+    .bDeviceProtocol    = MISC_PROTOCOL_IAD,
+    .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,
+
+    .idVendor           = USB_VID,
+    .idProduct          = USB_PID,
+    .bcdDevice          = 0x0100,
+
+    .iManufacturer      = 0x01,
+    .iProduct           = 0x02,
+    .iSerialNumber      = 0x03,
+
+    .bNumConfigurations = 0x01
+};
+
+// Invoked when received GET DEVICE DESCRIPTOR
+// Application return pointer to descriptor
+uint8_t const * tud_descriptor_device_cb(void) {
+    return (uint8_t const *) &desc_device;
+}
+
+//--------------------------------------------------------------------+
+// HID Report Descriptor
+//--------------------------------------------------------------------+
+
+uint8_t const desc_hid_report[] = {
+    TUD_HID_REPORT_DESC_GAMEPAD ( HID_REPORT_ID(static_cast<uint8_t>(descriptor::gamepad)) )
+};
+
+// Invoked when received GET HID REPORT DESCRIPTOR
+// Application return pointer to descriptor
+// Descriptor contents must exist long enough for transfer to complete
+uint8_t const * tud_hid_descriptor_report_cb(uint8_t) {
+    return desc_hid_report;
+}
+
+//--------------------------------------------------------------------+
+// String Descriptors
+//--------------------------------------------------------------------+
+
+enum class strings : uint8_t {
+    language_id,
+    manufacturer,
+    product,
+    serial,
+    interface,
+    _count
+};
+
+// array of pointer to string descriptors
+char16_t const *string_desc_arr[size_t(strings::_count)] = {
+    u"\u0409",          // 0: is supported language is English (0x0409)
+    u"j3gaming",        // 1: Manufacturer
+    u"EDMFD",           // 2: Product
+    nullptr,            // 3: Serials will use unique ID if possible
+    u"screen control",  // 4: screen interface
+};
+
+static constexpr size_t desc_len = 32;
+static uint16_t desc_str[desc_len + 1];
+
+// Invoked when received GET STRING DESCRIPTOR request
+// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
+uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
+    (void) langid;
+    size_t chr_count = 0;
+    strings string_id = static_cast<strings>(index);
+
+    switch (string_id) {
+    case strings::serial:
+        chr_count = board_usb_get_serial(desc_str + 1, desc_len);
+        break;
+
+    default:
+        if (string_id >= strings::_count) return nullptr;
+        uint16_t const *src = reinterpret_cast<uint16_t const*>(string_desc_arr[index]);
+        uint16_t *dest = desc_str + 1;
+        while (*src) {
+            *dest++ = *src++;
+            ++chr_count;
+        }
+        break;
+    }
+
+    // first byte is length (including header), second byte is string type
+    desc_str[0] = (uint16_t) ((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
+    return desc_str;
+}
+
+//--------------------------------------------------------------------+
+// Configuration Descriptor
+//--------------------------------------------------------------------+
+
+static constexpr size_t config_total_len = TUD_CONFIG_DESC_LEN + TUD_HID_DESC_LEN + TUD_VENDOR_DESC_LEN;
+enum class interface : uint8_t { HID, vendor, _count };
+enum class endpoint : uint8_t { HID = 0x81, vendor_out = 0x02, vendor_in = 0x82 };
+
+uint8_t const desc_configuration[config_total_len] = {
+    // Config number, interface count, string index, total length, attribute, power in mA
+    TUD_CONFIG_DESCRIPTOR(1, uint8_t(interface::_count), 0, config_total_len, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
+
+    // Interface number, string index, protocol, report descriptor len, EP In address, size & polling interval
+    TUD_HID_DESCRIPTOR(uint8_t(interface::HID), 0, HID_ITF_PROTOCOL_NONE, sizeof(desc_hid_report), uint8_t(endpoint::HID), CFG_TUD_HID_EP_BUFSIZE, 5),
+
+    // Interface number, string index, EP Out & IN address, EP size
+    TUD_VENDOR_DESCRIPTOR(uint8_t(interface::vendor), uint8_t(strings::interface), uint8_t(endpoint::vendor_out), uint8_t(endpoint::vendor_in), 64)
+
+    // CDC: Interface number, string index, EP notification address and size, EP data address (out, in) and size.
+    //TUD_CDC_DESCRIPTOR(uint8_t(interface::CDC), 4, uint8_t(endpoint::CDCnotify), 8, uint8_t(endpoint::CDCout), uint8_t(endpoint::CDCin), 64)
+};
+
+
+// Invoked when received GET CONFIGURATION DESCRIPTOR
+// Application return pointer to descriptor
+// Descriptor contents must exist long enough for transfer to complete
+uint8_t const * tud_descriptor_configuration_cb(uint8_t index) {
+    (void) index; // for multiple configurations
+
+    // This example use the same configuration for both high and full speed mode
+    return desc_configuration;
+}
--- a/src/usb_descriptors.hh
+++ b/src/usb_descriptors.hh
@@ -0,0 +1,6 @@
+#pragma once
+
+enum class descriptor {
+    gamepad = 1,
+    _count
+};
--- a/src/vendor.cc
+++ b/src/vendor.cc
@@ -0,0 +1,20 @@
+#include "bsp/board_api.h"
+#include "vendor/vendor_device.h"
+#include "blink.hh"
+
+extern "C" {
+    // TinyUSB callbacks
+    void tud_vendor_rx_cb(uint8_t, uint8_t const*, uint16_t);
+    void tud_vendor_tx_cb(uint8_t, uint32_t);
+}
+
+// Invoked when received new data
+void tud_vendor_rx_cb(uint8_t, uint8_t const* buffer, uint16_t bufsize) {
+    tud_vendor_write(buffer, bufsize);
+    tud_vendor_read_flush();
+}
+
+// Invoked when last rx (tx?) transfer finished
+void tud_vendor_tx_cb(uint8_t itf, uint32_t sent_bytes) {
+    tud_vendor_write_flush();
+}