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usb-descriptors.c
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usb-descriptors.c
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// SPDX-License-Identifier: MIT
/*
* Copyright (c) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
*
* This file is based on a file originally part of the
* MicroPython project, http://micropython.org/
*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
* Copyright (c) 2019 Damien P. George
*/
#include <hardware/flash.h>
#include <tusb.h>
#define DESC_STR_MAX 20
#define USBD_VID 0x2E8A /* Raspberry Pi */
#define USBD_PID 0x000A /* Raspberry Pi Pico SDK CDC */
#define USBD_DESC_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN * CFG_TUD_CDC)
#define USBD_MAX_POWER_MA 500
#define USBD_ITF_CDC_0 0
#define USBD_ITF_CDC_1 2
#define USBD_ITF_MAX 4
#define USBD_CDC_0_EP_CMD 0x81
#define USBD_CDC_1_EP_CMD 0x83
#define USBD_CDC_0_EP_OUT 0x01
#define USBD_CDC_1_EP_OUT 0x03
#define USBD_CDC_0_EP_IN 0x82
#define USBD_CDC_1_EP_IN 0x84
#define USBD_CDC_CMD_MAX_SIZE 8
#define USBD_CDC_IN_OUT_MAX_SIZE 64
#define USBD_STR_0 0x00
#define USBD_STR_MANUF 0x01
#define USBD_STR_PRODUCT 0x02
#define USBD_STR_SERIAL 0x03
#define USBD_STR_SERIAL_LEN 17
#define USBD_STR_CDC 0x04
static const tusb_desc_device_t usbd_desc_device = {
.bLength = sizeof(tusb_desc_device_t),
.bDescriptorType = TUSB_DESC_DEVICE,
.bcdUSB = 0x0200,
.bDeviceClass = TUSB_CLASS_MISC,
.bDeviceSubClass = MISC_SUBCLASS_COMMON,
.bDeviceProtocol = MISC_PROTOCOL_IAD,
.bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
.idVendor = USBD_VID,
.idProduct = USBD_PID,
.bcdDevice = 0x0100,
.iManufacturer = USBD_STR_MANUF,
.iProduct = USBD_STR_PRODUCT,
.iSerialNumber = USBD_STR_SERIAL,
.bNumConfigurations = 1,
};
static const uint8_t usbd_desc_cfg[USBD_DESC_LEN] = {
TUD_CONFIG_DESCRIPTOR(1, USBD_ITF_MAX, USBD_STR_0, USBD_DESC_LEN,
TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, USBD_MAX_POWER_MA),
TUD_CDC_DESCRIPTOR(USBD_ITF_CDC_0, USBD_STR_CDC, USBD_CDC_0_EP_CMD,
USBD_CDC_CMD_MAX_SIZE, USBD_CDC_0_EP_OUT, USBD_CDC_0_EP_IN,
USBD_CDC_IN_OUT_MAX_SIZE),
TUD_CDC_DESCRIPTOR(USBD_ITF_CDC_1, USBD_STR_CDC, USBD_CDC_1_EP_CMD,
USBD_CDC_CMD_MAX_SIZE, USBD_CDC_1_EP_OUT, USBD_CDC_1_EP_IN,
USBD_CDC_IN_OUT_MAX_SIZE),
};
static char usbd_serial[USBD_STR_SERIAL_LEN] = "000000000000";
static const char *const usbd_desc_str[] = {
[USBD_STR_MANUF] = "Raspberry Pi",
[USBD_STR_PRODUCT] = "Pico",
[USBD_STR_SERIAL] = usbd_serial,
[USBD_STR_CDC] = "Board CDC",
};
const uint8_t *tud_descriptor_device_cb(void)
{
return (const uint8_t *) &usbd_desc_device;
}
const uint8_t *tud_descriptor_configuration_cb(uint8_t index)
{
return usbd_desc_cfg;
}
const uint16_t *tud_descriptor_string_cb(uint8_t index, uint16_t langid)
{
static uint16_t desc_str[DESC_STR_MAX];
uint8_t len;
if (index == 0) {
desc_str[1] = 0x0409;
len = 1;
} else {
const char *str;
char serial[USBD_STR_SERIAL_LEN];
if (index >= sizeof(usbd_desc_str) / sizeof(usbd_desc_str[0]))
return NULL;
str = usbd_desc_str[index];
for (len = 0; len < DESC_STR_MAX - 1 && str[len]; ++len)
desc_str[1 + len] = str[len];
}
desc_str[0] = (TUSB_DESC_STRING << 8) | (2 * len + 2);
return desc_str;
}
void usbd_serial_init(void)
{
uint8_t id[8];
flash_get_unique_id(id);
snprintf(usbd_serial, USBD_STR_SERIAL_LEN, "%02X%02X%02X%02X%02X%02X%02X%02X",
id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7]);
}