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/*
* 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 0x4019
#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_TUSB_MCU == OPT_MCU_LPC175X_6X || CFG_TUSB_MCU == OPT_MCU_LPC177X_8X || CFG_TUSB_MCU == OPT_MCU_LPC40XX
// LPC 17xx and 40xx endpoint type (bulk/interrupt/iso) are fixed by its number
// 0 control, 1 In, 2 Bulk, 3 Iso, 4 In, 5 Bulk etc ...
#define EPNUM_CDC_NOTIF 0x81
#define EPNUM_CDC_OUT 0x02
#define EPNUM_CDC_IN 0x82
#define EPNUM_PRINTER_OUT 0x05
#define EPNUM_PRINTER_IN 0x85
#elif 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;
}
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