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@@ -0,0 +1,29 @@
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cmake_minimum_required(VERSION 3.20)
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include(${CMAKE_CURRENT_SOURCE_DIR}/../../../hw/bsp/family_support.cmake)
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project(printer_to_cdc C CXX ASM)
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# Checks this example is valid for the family and initializes the project
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family_initialize_project(${PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR})
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# Espressif has its own cmake build system
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if(FAMILY STREQUAL "espressif")
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return()
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endif()
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add_executable(${PROJECT_NAME})
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# Example source
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target_sources(${PROJECT_NAME} PUBLIC
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${CMAKE_CURRENT_SOURCE_DIR}/src/main.c
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${CMAKE_CURRENT_SOURCE_DIR}/src/usb_descriptors.c
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)
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# Example include
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target_include_directories(${PROJECT_NAME} PUBLIC
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${CMAKE_CURRENT_SOURCE_DIR}/src
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)
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# Configure compilation flags and libraries for the example without RTOS.
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# See the corresponding function in hw/bsp/FAMILY/family.cmake for details.
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family_configure_device_example(${PROJECT_NAME} noos)
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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 +1,93 @@
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#### Printer to CDC
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This example demonstrates a USB composite device with a Printer class interface and a CDC serial interface. Data flows bidirectionally between the two:
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- Data sent to the Printer (from host) is forwarded to the CDC serial port
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- Data sent to the CDC serial port (from host) is forwarded to the Printer IN endpoint
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This is useful for debugging printer class communication or as a reference for implementing printer class devices.
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#### USB Descriptors
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| Interface | Class | Description |
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|-----------|-------|-------------|
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| 0 | CDC ACM | Virtual serial port |
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| 2 | Printer | USB Printer (bidirectional, protocol 2) |
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#### Configuration
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Notable `tusb_config.h` settings:
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```c
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#define CFG_TUD_CDC 1
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#define CFG_TUD_PRINTER 1
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#define CFG_TUD_CDC_RX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
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#define CFG_TUD_CDC_TX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
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#define CFG_TUD_PRINTER_RX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
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#define CFG_TUD_PRINTER_TX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
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```
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#### How to Test
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The device exposes two endpoints on the host:
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- `/dev/ttyACM0` (CDC serial port)
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- `/dev/usb/lp0` (USB printer)
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Note: the actual device numbers may vary depending on your system.
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**Prerequisites (Linux):**
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```bash
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# Load the USB printer kernel module if not already loaded
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sudo modprobe usblp
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# Check devices exist
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ls /dev/ttyACM* /dev/usb/lp*
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```
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**Test Printer to CDC (host writes to printer, reads from CDC):**
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```bash
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# Terminal 1: read from CDC
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cat /dev/ttyACM0
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# Terminal 2: write to printer
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echo "hello from printer" > /dev/usb/lp0
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# "hello from printer" appears in Terminal 1
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```
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**Test CDC to Printer (host writes to CDC, reads from printer):**
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```bash
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# Terminal 1: read from printer IN endpoint
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cat /dev/usb/lp0
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# Terminal 2: write to CDC
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echo "hello from cdc" > /dev/ttyACM0
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# "hello from cdc" appears in Terminal 1
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```
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**Interactive bidirectional test:**
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```bash
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# Terminal 1: open CDC serial port
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minicom -D /dev/ttyACM0
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# Terminal 2: send to printer
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echo "tinyusb print example" > /dev/usb/lp0
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# Text appears in minicom. Type in minicom to send data back through printer TX.
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```
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#### IEEE 1284 Device ID
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The device responds to GET_DEVICE_ID requests with:
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```
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MFG:TinyUSB;MDL:Printer to CDC;CMD:PS;CLS:PRINTER;
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```
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Verify with:
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```bash
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cat /sys/class/usbmisc/lp0/device/ieee1284_id
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```
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@@ -0,0 +1,117 @@
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2026 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
|
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* all 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
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* THE SOFTWARE.
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*
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*/
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/* This example demonstrates a USB Printer + CDC composite device.
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* Data received on the Printer interface is forwarded to the CDC serial port,
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* and data received on the CDC serial port is forwarded back to the Printer interface.
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*
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* To test:
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* 1. Flash the device
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* 2. Open a serial terminal on the CDC port (e.g. /dev/ttyACM0)
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* 3. Send data to the printer: echo "hello" > /dev/usb/lp0
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* 4. The data appears on the CDC serial terminal
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* 5. Type in the serial terminal to send data back through the printer TX
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "bsp/board_api.h"
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#include "tusb.h"
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#include "usb_descriptors.h"
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// -------------------------------------------------------------------+
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// Tasks
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// -------------------------------------------------------------------+
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// Forward data from Printer RX to CDC TX
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static void printer_to_cdc_task(void) {
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uint32_t avail = tud_printer_read_available();
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if (avail == 0 || !tud_cdc_write_available()) {
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return;
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}
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uint8_t buf[64];
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uint32_t count = tud_printer_read(buf, TU_MIN(sizeof(buf), tud_cdc_write_available()));
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if (count > 0) {
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tud_cdc_write(buf, count);
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tud_cdc_write_flush();
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}
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}
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// Forward data from CDC RX to Printer TX
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static void cdc_to_printer_task(void) {
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uint32_t avail = tud_printer_write_available();
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if (tud_cdc_available() == 0 || avail == 0) {
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return;
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}
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uint8_t buf[64];
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uint32_t count = tud_cdc_read(buf, TU_MIN(sizeof(buf), avail));
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if (count > 0) {
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tud_printer_write(buf, count);
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tud_printer_write_flush();
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}
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}
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int main(void) {
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board_init();
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// init device stack on configured roothub port
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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(); // tinyusb device task
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printer_to_cdc_task(); // forward printer data to CDC
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cdc_to_printer_task(); // forward CDC data to printer
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}
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}
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//--------------------------------------------------------------------+
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// Printer callbacks
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//--------------------------------------------------------------------+
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void tud_printer_rx_cb(uint8_t itf) {
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(void)itf;
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}
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// IEEE 1284 Device ID: first 2 bytes are big-endian total length (including the 2 length bytes).
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// The rest is the Device ID string using standard abbreviated keys.
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static const char printer_device_id[] =
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"\x00\x34" // total length = 52 = 0x0034 (big-endian)
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"MFG:TinyUSB;"
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"MDL:Printer to CDC;"
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"CMD:PS;"
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"CLS:PRINTER;";
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TU_VERIFY_STATIC(sizeof(printer_device_id) - 1 == 52, "device ID length mismatch");
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uint8_t const *tud_printer_get_device_id_cb(uint8_t itf) {
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(void)itf;
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return (uint8_t const *)printer_device_id;
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}
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@@ -0,0 +1,120 @@
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2026 Ha Thach (tinyusb.org)
|
||||
*
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||||
* 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" {
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#endif
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//--------------------------------------------------------------------+
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// Board Specific Configuration
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//--------------------------------------------------------------------+
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// RHPort number used for device can be defined by board.mk, default to port 0
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#ifndef BOARD_TUD_RHPORT
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#define BOARD_TUD_RHPORT 0
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#endif
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// RHPort max operational speed can defined by board.mk
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#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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//--------------------------------------------------------------------
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// defined by compiler flags for flexibility
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#ifndef CFG_TUSB_MCU
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#error CFG_TUSB_MCU must be defined
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#endif
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#ifndef CFG_TUSB_OS
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#define CFG_TUSB_OS OPT_OS_NONE
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#endif
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#ifndef CFG_TUSB_DEBUG
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#define CFG_TUSB_DEBUG 0
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||||
#endif
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||||
|
||||
// Enable Device stack
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||||
#define CFG_TUD_ENABLED 1
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|
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// Default is max speed that hardware controller could support with on-chip PHY
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||||
#define CFG_TUD_MAX_SPEED BOARD_TUD_MAX_SPEED
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||||
|
||||
/* 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)))
|
||||
*/
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||||
#ifndef CFG_TUSB_MEM_SECTION
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#define CFG_TUSB_MEM_SECTION
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#endif
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|
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#ifndef CFG_TUSB_MEM_ALIGN
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||||
#define CFG_TUSB_MEM_ALIGN __attribute__((aligned(4)))
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#endif
|
||||
|
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//--------------------------------------------------------------------
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||||
// DEVICE CONFIGURATION
|
||||
//--------------------------------------------------------------------
|
||||
|
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#ifndef CFG_TUD_ENDPOINT0_SIZE
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#define CFG_TUD_ENDPOINT0_SIZE 64
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#endif
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|
||||
//------------- CLASS -------------//
|
||||
#define CFG_TUD_HID 0
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||||
#define CFG_TUD_CDC 1
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#define CFG_TUD_MSC 0
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||||
#define CFG_TUD_MIDI 0
|
||||
#define CFG_TUD_VENDOR 0
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||||
#define CFG_TUD_PRINTER 1
|
||||
|
||||
// CDC FIFO size of TX and RX
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||||
#define CFG_TUD_CDC_RX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
#define CFG_TUD_CDC_TX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
|
||||
// CDC Endpoint transfer buffer size, default to max bulk packet size (HS 512, FS 64). Larger is faster.
|
||||
// Larger RX_EPSIZE requires CFG_TUD_CDC_RX_NEED_ZLP = 1 and host ZLP support
|
||||
#define CFG_TUD_CDC_RX_EPSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
#define CFG_TUD_CDC_TX_EPSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
|
||||
// Printer buffer sizes
|
||||
#define CFG_TUD_PRINTER_RX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
#define CFG_TUD_PRINTER_TX_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
#define CFG_TUD_PRINTER_RX_EPSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
#define CFG_TUD_PRINTER_TX_EPSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* _TUSB_CONFIG_H_ */
|
||||
@@ -0,0 +1,217 @@
|
||||
/*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright (c) 2026 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"
|
||||
|
||||
#include "usb_descriptors.h"
|
||||
|
||||
#define USB_VID 0xCafe
|
||||
#define USB_PID 0x4005
|
||||
#define USB_BCD 0x0200
|
||||
|
||||
//--------------------------------------------------------------------+
|
||||
// Device Descriptors
|
||||
//--------------------------------------------------------------------+
|
||||
static tusb_desc_device_t const desc_device = {
|
||||
.bLength = sizeof(tusb_desc_device_t),
|
||||
.bDescriptorType = TUSB_DESC_DEVICE,
|
||||
.bcdUSB = USB_BCD,
|
||||
|
||||
// Use Interface Association Descriptor (IAD) for CDC
|
||||
// As required by USB Specs IAD's subclass must be common class (2) and protocol must be IAD (1)
|
||||
.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;
|
||||
}
|
||||
|
||||
//--------------------------------------------------------------------+
|
||||
// Configuration Descriptor
|
||||
//--------------------------------------------------------------------+
|
||||
|
||||
// Endpoint numbers
|
||||
#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_PRINTER_OUT 0x0A
|
||||
#define EPNUM_PRINTER_IN 0x8B
|
||||
#else
|
||||
#define EPNUM_CDC_NOTIF 0x81
|
||||
#define EPNUM_CDC_OUT 0x02
|
||||
#define EPNUM_CDC_IN 0x83
|
||||
#define EPNUM_PRINTER_OUT 0x04
|
||||
#define EPNUM_PRINTER_IN 0x85
|
||||
#endif
|
||||
#else
|
||||
#define EPNUM_CDC_NOTIF 0x81
|
||||
#define EPNUM_CDC_OUT 0x02
|
||||
#define EPNUM_CDC_IN 0x82
|
||||
#define EPNUM_PRINTER_OUT 0x03
|
||||
#define EPNUM_PRINTER_IN 0x83
|
||||
#endif
|
||||
|
||||
// full speed configuration
|
||||
static uint8_t const desc_fs_configuration[] = {
|
||||
// Config number, interface count, string index, total length, attribute, power in mA
|
||||
TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
|
||||
|
||||
// Interface number, string index, EP notification address and size, EP data address (out, in) and size.
|
||||
TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 16, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
|
||||
|
||||
// Interface number, string index, EP Bulk Out address, EP Bulk In address, EP size
|
||||
TUD_PRINTER_DESCRIPTOR(ITF_NUM_PRINTER, 5, EPNUM_PRINTER_OUT, EPNUM_PRINTER_IN, 64),
|
||||
};
|
||||
|
||||
#if TUD_OPT_HIGH_SPEED
|
||||
// high speed configuration
|
||||
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_PRINTER_DESCRIPTOR(ITF_NUM_PRINTER, 5, EPNUM_PRINTER_OUT, EPNUM_PRINTER_IN, 512),
|
||||
};
|
||||
|
||||
// other speed configuration
|
||||
static uint8_t desc_other_speed_config[CONFIG_TOTAL_LEN];
|
||||
|
||||
// device qualifier is mostly similar to device descriptor since we don't change configuration based on speed
|
||||
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 = TUSB_CLASS_MISC,
|
||||
.bDeviceSubClass = MISC_SUBCLASS_COMMON,
|
||||
.bDeviceProtocol = MISC_PROTOCOL_IAD,
|
||||
|
||||
.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;
|
||||
|
||||
// if link speed is high return fullspeed config, and vice versa
|
||||
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 // TUD_OPT_HIGH_SPEED
|
||||
|
||||
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
|
||||
}
|
||||
|
||||
//--------------------------------------------------------------------+
|
||||
// String Descriptors
|
||||
//--------------------------------------------------------------------+
|
||||
|
||||
enum {
|
||||
STRID_LANGID = 0,
|
||||
STRID_MANUFACTURER,
|
||||
STRID_PRODUCT,
|
||||
STRID_SERIAL,
|
||||
STRID_CDC,
|
||||
STRID_PRINTER,
|
||||
};
|
||||
|
||||
static char const *string_desc_arr[] = {
|
||||
(const char[]) { 0x09, 0x04 }, // 0: supported language is English (0x0409)
|
||||
"TinyUSB", // 1: Manufacturer
|
||||
"TinyUSB Device", // 2: Product
|
||||
NULL, // 3: Serial, use unique ID if possible
|
||||
"TinyUSB CDC", // 4: CDC Interface
|
||||
"TinyUSB Printer", // 5: Printer Interface
|
||||
};
|
||||
|
||||
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;
|
||||
}
|
||||
@@ -0,0 +1,37 @@
|
||||
/*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright (c) 2026 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 USB_DESCRIPTORS_H_
|
||||
#define USB_DESCRIPTORS_H_
|
||||
|
||||
enum {
|
||||
ITF_NUM_CDC,
|
||||
ITF_NUM_CDC_DATA,
|
||||
ITF_NUM_PRINTER,
|
||||
ITF_NUM_TOTAL,
|
||||
};
|
||||
|
||||
#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_PRINTER_DESC_LEN)
|
||||
|
||||
#endif /* USB_DESCRIPTORS_H_ */
|
||||
Reference in new issue
Block a user