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