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@@ -0,0 +1,35 @@
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cmake_minimum_required(VERSION 3.20)
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include(${CMAKE_CURRENT_SOURCE_DIR}/../../../hw/bsp/family_support.cmake)
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project(cdc_msc_throughput C CXX ASM)
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# Checks this example is valid for the family and initializes the project
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family_initialize_project(${PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR})
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# Espressif has its own cmake build system
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if(FAMILY STREQUAL "espressif")
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return()
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endif()
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if (RTOS STREQUAL zephyr)
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set(EXE_NAME app)
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else()
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set(EXE_NAME ${PROJECT_NAME})
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add_executable(${EXE_NAME})
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endif()
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# Example source
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target_sources(${EXE_NAME} PRIVATE
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${CMAKE_CURRENT_SOURCE_DIR}/src/main.c
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${CMAKE_CURRENT_SOURCE_DIR}/src/usb_descriptors.c
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)
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# Example include
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target_include_directories(${EXE_NAME} PUBLIC
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${CMAKE_CURRENT_SOURCE_DIR}/src
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)
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# Configure compilation flags and libraries for the example without RTOS.
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# See the corresponding function in hw/bsp/FAMILY/family.cmake for details.
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family_configure_device_example(${EXE_NAME} ${RTOS})
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@@ -0,0 +1,6 @@
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{
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"version": 6,
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"include": [
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"../../../hw/bsp/BoardPresets.json"
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]
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}
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@@ -0,0 +1,11 @@
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include ../../../hw/bsp/family_support.mk
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INC += \
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src \
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# Example source
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EXAMPLE_SOURCE += $(wildcard src/*.c)
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SRC_C += $(addprefix $(EXAMPLE_PATH)/, $(EXAMPLE_SOURCE))
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include ../../../hw/bsp/family_rules.mk
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@@ -0,0 +1,70 @@
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# CDC + MSC Throughput
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A deliberately minimal CDC + MSC composite device for measuring **pure USB bulk
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throughput** — the ceiling set by the USB link and the TinyUSB driver, with no
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backing storage or per-byte work in the way.
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## How it measures the ceiling, not storage
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- **MSC** advertises a 1 GiB logical disk (2 Mi × 512-byte blocks) but has no real
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backing store. Writes are discarded; reads zero-fill only the low LBAs the host
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scans during enumeration (partition table / GPT header) and otherwise return
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whatever is already in the transfer buffer — so no `memset`/copy cost skews the result.
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- **CDC** drains its RX in `tud_cdc_rx_cb` and sources TX from a static zero filler,
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so `dd` can push data in either direction over `/dev/ttyACMx`.
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The 1 GiB capacity lets `dd` run long enough for the rate to stabilise; high-speed peripherals show the most headroom.
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## USB Descriptors
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| Interface | Class driver |
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|-----------|--------------|
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| 0–1 | CDC (virtual serial) |
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| 2 | MSC (mass storage) |
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## Configuration
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Notable `tusb_config.h` settings (tuned for throughput):
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```c
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#define CFG_TUD_CDC 1
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#define CFG_TUD_MSC 1
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#define CFG_TUD_MSC_EP_BUFSIZE (TUD_OPT_HIGH_SPEED ? 4096 : 1024) // large MSC bulk buffer
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#define CFG_TUD_CDC_RX_EPSIZE (TUD_OPT_HIGH_SPEED ? 2*512 : 2*64)
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#define CFG_TUD_CDC_TX_EPSIZE CFG_TUD_CDC_RX_EPSIZE
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#define CFG_TUD_CDC_RX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 2*512 : 2*64)
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#define CFG_TUD_CDC_TX_BUFSIZE CFG_TUD_CDC_RX_BUFSIZE
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```
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## Building
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CMake:
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```bash
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mkdir build && cd build
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cmake -DBOARD=raspberry_pi_pico ..
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cmake --build .
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```
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Make:
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```bash
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make BOARD=raspberry_pi_pico all
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```
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## Measuring throughput (Linux)
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The MSC disk appears as a raw block device (e.g. `/dev/sdX`); the CDC port as `/dev/ttyACMx`.
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```bash
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# MSC read (device → host)
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sudo dd if=/dev/sdX of=/dev/null bs=1M count=256 iflag=direct
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# MSC write (host → device, discarded)
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sudo dd if=/dev/zero of=/dev/sdX bs=1M count=256 oflag=direct
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# CDC read (device → host)
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dd if=/dev/ttyACM0 of=/dev/null bs=64k count=4096
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```
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> Pick the right `/dev/sdX` carefully — writing to the wrong block device destroys data.
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@@ -0,0 +1,151 @@
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Ha Thach (tinyusb.org)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
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* SOFTWARE.
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*
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*/
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#include "bsp/board_api.h"
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#include "tusb.h"
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// cdc_msc_throughput: minimal CDC+MSC device aimed at measuring pure USB bulk throughput.
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// MSC read/write callbacks don't touch any backing storage - write discards the
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// data and read only zero-fills the low LBAs the host scans during enumeration
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// (partition table, GPT header). Higher LBAs return whatever is already in the
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// transfer buffer, so `dd` numbers reflect the USB/driver ceiling, not any
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// simulated storage or per-byte memset cost.
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// CDC path drains RX in tud_cdc_rx_cb and sources TX from a static filler in the
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// main loop so `dd` can target /dev/ttyACMx in either direction.
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static void cdc_throughput_task(void);
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//--------------------------------------------------------------------+
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// Main
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//--------------------------------------------------------------------+
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int main(void) {
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board_init();
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tusb_rhport_init_t dev_init = {.role = TUSB_ROLE_DEVICE, .speed = TUSB_SPEED_AUTO};
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tusb_init(BOARD_TUD_RHPORT, &dev_init);
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board_init_after_tusb();
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while (1) {
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tud_task();
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cdc_throughput_task();
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}
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}
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//--------------------------------------------------------------------+
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// CDC callbacks + tasks
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//--------------------------------------------------------------------+
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void tud_cdc_rx_cb(uint8_t itf) {
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(void) itf;
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tud_cdc_read_flush(); // Drain RX
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}
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static void cdc_throughput_task(void) {
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if (!tud_cdc_connected()) return;
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// Source TX: fill whatever write room is free.
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static uint8_t const filler[CFG_TUD_CDC_TX_EPSIZE] = {0};
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uint32_t room = tud_cdc_write_available();
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while (room > 0) {
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uint32_t n = tud_cdc_write(filler, tu_min32(room, sizeof(filler)));
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if (n == 0) {
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break;
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}
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room -= n;
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}
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tud_cdc_write_flush();
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}
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//--------------------------------------------------------------------+
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// MSC callbacks
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//--------------------------------------------------------------------+
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// 1 GiB logical capacity so `dd` can run long enough for stable numbers.
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// No real backing store - block content is synthesised on read, discarded on write.
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enum {
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DISK_BLOCK_SIZE = 512,
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DISK_BLOCK_COUNT = 0x00200000u, // 2 Mi blocks = 1 GiB
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// Kernel probes partition-table / filesystem-superblock locations near the
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// start of the disk during enumeration. Zero-fill only this head range so the
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// block layer sees "no partition, no filesystem" and leaves us alone; higher
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// LBAs skip the memset so `dd` measures pure USB/driver throughput.
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DISK_ZEROFILL_LBA = 64, // 32 KiB
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};
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void tud_msc_inquiry_cb(uint8_t lun, uint8_t vendor_id[8], uint8_t product_id[16], uint8_t product_rev[4]) {
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(void) lun;
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const char vid[] = "TinyUSB";
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const char pid[] = "Mass Storage";
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const char rev[] = "1.0";
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(void) strncpy((char*) vendor_id, vid, 8);
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(void) strncpy((char*) product_id, pid, 16);
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(void) strncpy((char*) product_rev, rev, 4);
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}
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bool tud_msc_test_unit_ready_cb(uint8_t lun) {
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(void) lun;
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return true;
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}
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void tud_msc_capacity_cb(uint8_t lun, uint32_t *block_count, uint16_t *block_size) {
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(void) lun;
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*block_count = DISK_BLOCK_COUNT;
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*block_size = DISK_BLOCK_SIZE;
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}
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bool tud_msc_start_stop_cb(uint8_t lun, uint8_t power_condition, bool start, bool load_eject) {
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(void) lun; (void) power_condition; (void) start; (void) load_eject;
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return true;
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}
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bool tud_msc_is_writable_cb(uint8_t lun) {
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(void) lun;
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return true;
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}
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// READ10: zero-fill only the head range the kernel inspects, skip memset everywhere
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// else so we measure the USB / driver path rather than memset cost.
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int32_t tud_msc_read10_cb(uint8_t lun, uint32_t lba, uint32_t offset, void *buffer, uint32_t bufsize) {
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(void) lun; (void) offset;
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if (lba < DISK_ZEROFILL_LBA) {
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memset(buffer, 0, bufsize);
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} else {
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(void) buffer;
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}
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return (int32_t) bufsize;
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}
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// WRITE10: discard the received data entirely - this is the pure USB-speed test.
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int32_t tud_msc_write10_cb(uint8_t lun, uint32_t lba, uint32_t offset, uint8_t *buffer, uint32_t bufsize) {
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(void) lun; (void) lba; (void) offset; (void) buffer;
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return (int32_t) bufsize;
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}
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// Unknown SCSI commands: stall with Invalid Command sense.
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int32_t tud_msc_scsi_cb(uint8_t lun, uint8_t const scsi_cmd[16], void *buffer, uint16_t bufsize) {
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(void) scsi_cmd; (void) buffer; (void) bufsize;
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tud_msc_set_sense(lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00);
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return -1;
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}
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@@ -0,0 +1,103 @@
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/*
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||||
* 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_
|
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#define TUSB_CONFIG_H_
|
||||
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||||
#ifdef __cplusplus
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||||
extern "C" {
|
||||
#endif
|
||||
|
||||
//--------------------------------------------------------------------
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// Board Specific Configuration
|
||||
//--------------------------------------------------------------------
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||||
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||||
#ifndef BOARD_TUD_RHPORT
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#define BOARD_TUD_RHPORT 0
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||||
#endif
|
||||
|
||||
#ifndef BOARD_TUD_MAX_SPEED
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||||
#define BOARD_TUD_MAX_SPEED OPT_MODE_DEFAULT_SPEED
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||||
#endif
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||||
|
||||
//--------------------------------------------------------------------
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||||
// Common Configuration
|
||||
//--------------------------------------------------------------------
|
||||
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||||
#ifndef CFG_TUSB_MCU
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||||
#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
|
||||
#define CFG_TUD_MAX_SPEED BOARD_TUD_MAX_SPEED
|
||||
|
||||
#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
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||||
#define CFG_TUD_ENDPOINT0_SIZE 64
|
||||
#endif
|
||||
|
||||
//------------- CLASS -------------//
|
||||
#define CFG_TUD_CDC 1
|
||||
#define CFG_TUD_MSC 1
|
||||
|
||||
// Large MSC bulk buffer: host transfers big CBW payloads (e.g. dd bs=1M does 64KiB
|
||||
// chunks). A 4K per-bulk-IO buffer lets the class driver amortise the per-CBW
|
||||
// overhead across many USB packets, approximating the maximum USB bulk throughput.
|
||||
#define CFG_TUD_MSC_EP_BUFSIZE (TUD_OPT_HIGH_SPEED ? 4096 : 1024)
|
||||
|
||||
// #define CFG_TUD_CDC_TX_PERSISTENT 1
|
||||
|
||||
// CDC throughput: size for HS; tinyusb will auto-scale for FS via TUD_OPT_HIGH_SPEED.
|
||||
#define CFG_TUD_CDC_RX_EPSIZE (TUD_OPT_HIGH_SPEED ? 2*512 : 2*64)
|
||||
#define CFG_TUD_CDC_TX_EPSIZE CFG_TUD_CDC_RX_EPSIZE
|
||||
|
||||
#define CFG_TUD_CDC_RX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 2*512 : 2*64)
|
||||
#define CFG_TUD_CDC_TX_BUFSIZE CFG_TUD_CDC_RX_BUFSIZE
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* TUSB_CONFIG_H_ */
|
||||
+186
@@ -0,0 +1,186 @@
|
||||
/*
|
||||
* 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 "bsp/board_api.h"
|
||||
#include "tusb.h"
|
||||
|
||||
#define USB_PID (0x4000 | ((CFG_TUD_CDC) ? (1 << 0) : 0) | ((CFG_TUD_MSC) ? (1 << 1) : 0))
|
||||
#define USB_VID 0xCafe
|
||||
#define USB_BCD 0x0200
|
||||
|
||||
static tusb_desc_device_t const desc_device = {
|
||||
.bLength = sizeof(tusb_desc_device_t),
|
||||
.bDescriptorType = TUSB_DESC_DEVICE,
|
||||
.bcdUSB = USB_BCD,
|
||||
|
||||
// IAD required for composite CDC + MSC
|
||||
.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,
|
||||
};
|
||||
|
||||
uint8_t const *tud_descriptor_device_cb(void) {
|
||||
return (uint8_t const *) &desc_device;
|
||||
}
|
||||
|
||||
enum {
|
||||
ITF_NUM_CDC = 0,
|
||||
ITF_NUM_CDC_DATA,
|
||||
ITF_NUM_MSC,
|
||||
ITF_NUM_TOTAL,
|
||||
};
|
||||
|
||||
// Place bulk endpoints on EP>=8 for MAX32690 class parts (bigger FIFO, DPB-capable).
|
||||
#if CFG_TUD_ENDPOINT_ONE_DIRECTION_ONLY
|
||||
#if TU_CHECK_MCU(OPT_MCU_MAX32650, OPT_MCU_MAX32666, OPT_MCU_MAX32690, OPT_MCU_MAX78002)
|
||||
// Put bulk on EP>=8 so the 2048/4096-byte FIFOs can back double packet buffering
|
||||
#define EPNUM_CDC_NOTIF 0x81
|
||||
#define EPNUM_CDC_OUT 0x08
|
||||
#define EPNUM_CDC_IN 0x89
|
||||
#define EPNUM_MSC_OUT 0x0A
|
||||
#define EPNUM_MSC_IN 0x8B
|
||||
#else
|
||||
#define EPNUM_CDC_NOTIF 0x81
|
||||
#define EPNUM_CDC_OUT 0x02
|
||||
#define EPNUM_CDC_IN 0x83
|
||||
#define EPNUM_MSC_OUT 0x04
|
||||
#define EPNUM_MSC_IN 0x85
|
||||
#endif
|
||||
#else
|
||||
#define EPNUM_CDC_NOTIF 0x81
|
||||
#define EPNUM_CDC_OUT 0x02
|
||||
#define EPNUM_CDC_IN 0x82
|
||||
#define EPNUM_MSC_OUT 0x03
|
||||
#define EPNUM_MSC_IN 0x83
|
||||
#endif
|
||||
|
||||
#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_MSC_DESC_LEN)
|
||||
|
||||
static uint8_t const desc_fs_configuration[] = {
|
||||
TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
|
||||
TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 16, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
|
||||
TUD_MSC_DESCRIPTOR(ITF_NUM_MSC, 5, EPNUM_MSC_OUT, EPNUM_MSC_IN, 64),
|
||||
};
|
||||
|
||||
#if TUD_OPT_HIGH_SPEED
|
||||
static uint8_t const desc_hs_configuration[] = {
|
||||
TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
|
||||
TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 16, EPNUM_CDC_OUT, EPNUM_CDC_IN, 512),
|
||||
TUD_MSC_DESCRIPTOR(ITF_NUM_MSC, 5, EPNUM_MSC_OUT, EPNUM_MSC_IN, 512),
|
||||
};
|
||||
|
||||
static uint8_t desc_other_speed_config[CONFIG_TOTAL_LEN];
|
||||
|
||||
static tusb_desc_device_qualifier_t const desc_device_qualifier = {
|
||||
.bLength = sizeof(tusb_desc_device_qualifier_t),
|
||||
.bDescriptorType = TUSB_DESC_DEVICE_QUALIFIER,
|
||||
.bcdUSB = USB_BCD,
|
||||
.bDeviceClass = 0x00,
|
||||
.bDeviceSubClass = 0x00,
|
||||
.bDeviceProtocol = 0x00,
|
||||
.bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
|
||||
.bNumConfigurations = 0x01,
|
||||
.bReserved = 0x00,
|
||||
};
|
||||
|
||||
uint8_t const *tud_descriptor_device_qualifier_cb(void) {
|
||||
return (uint8_t const *) &desc_device_qualifier;
|
||||
}
|
||||
|
||||
uint8_t const *tud_descriptor_other_speed_configuration_cb(uint8_t index) {
|
||||
(void) index;
|
||||
memcpy(desc_other_speed_config,
|
||||
(tud_speed_get() == TUSB_SPEED_HIGH) ? desc_fs_configuration : desc_hs_configuration,
|
||||
CONFIG_TOTAL_LEN);
|
||||
desc_other_speed_config[1] = TUSB_DESC_OTHER_SPEED_CONFIG;
|
||||
return desc_other_speed_config;
|
||||
}
|
||||
#endif
|
||||
|
||||
uint8_t const *tud_descriptor_configuration_cb(uint8_t index) {
|
||||
(void) index;
|
||||
#if TUD_OPT_HIGH_SPEED
|
||||
return (tud_speed_get() == TUSB_SPEED_HIGH) ? desc_hs_configuration : desc_fs_configuration;
|
||||
#else
|
||||
return desc_fs_configuration;
|
||||
#endif
|
||||
}
|
||||
|
||||
enum {
|
||||
STRID_LANGID = 0,
|
||||
STRID_MANUFACTURER,
|
||||
STRID_PRODUCT,
|
||||
STRID_SERIAL,
|
||||
};
|
||||
|
||||
static char const *string_desc_arr[] = {
|
||||
(const char[]) { 0x09, 0x04 },
|
||||
"TinyUSB",
|
||||
"Throughput",
|
||||
NULL,
|
||||
"TinyUSB CDC",
|
||||
"TinyUSB MSC",
|
||||
};
|
||||
|
||||
static uint16_t _desc_str[32 + 1];
|
||||
|
||||
uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
|
||||
(void) langid;
|
||||
size_t chr_count;
|
||||
|
||||
switch (index) {
|
||||
case STRID_LANGID:
|
||||
memcpy(&_desc_str[1], string_desc_arr[0], 2);
|
||||
chr_count = 1;
|
||||
break;
|
||||
|
||||
case STRID_SERIAL:
|
||||
chr_count = board_usb_get_serial(_desc_str + 1, 32);
|
||||
break;
|
||||
|
||||
default:
|
||||
if (!(index < sizeof(string_desc_arr) / sizeof(string_desc_arr[0]))) return NULL;
|
||||
const char *str = string_desc_arr[index];
|
||||
chr_count = strlen(str);
|
||||
size_t const max_count = sizeof(_desc_str) / sizeof(_desc_str[0]) - 1;
|
||||
if (chr_count > max_count) chr_count = max_count;
|
||||
for (size_t i = 0; i < chr_count; i++) _desc_str[1 + i] = str[i];
|
||||
break;
|
||||
}
|
||||
|
||||
_desc_str[0] = (uint16_t) ((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
|
||||
return _desc_str;
|
||||
}
|
||||
Reference in new issue
Block a user