76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include "esp32s2/rom/usb/usb_common.h"
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#include "soc/soc.h"
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#include "soc/efuse_reg.h"
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/* USB CDC descriptor.
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* Note that we aren't using the one in ROM since it doesn't
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* set "serial" to the MAC address.
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* However overriding the descriptor is cheap - we can reuse most
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* of its components from ROM.
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*/
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/* This is not const, since the MAC address is only known at run time */
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static struct string_descriptor s_str_serial_descr = {
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.bLength = 2 + 2 * 17,
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.bDescriptorType = 0x03,
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.bString={'0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0'}
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};
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static const struct rom_usb_descriptors s_acm_usb_descriptors_override = {
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.device_descr = &general_device_descr,
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.config_descr = { &acm_config_descr },
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.string_count = 4,
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.string0_descr = &string0_descr,
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.string_descrs = {
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&str_manu_descr,
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&str_prod_descr,
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&s_str_serial_descr
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}
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};
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static inline uint16_t nibble_to_hex_u16(uint8_t b)
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{
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if (b < 0xa) {
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return '0' + b;
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} else {
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return 'a' + b - 0xa;
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}
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}
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void rom_usb_cdc_set_descriptor_patch(void)
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{
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/* Get the MAC address */
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const uint32_t mac0 = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_0_REG, EFUSE_MAC_0);
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const uint32_t mac1 = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_1_REG, EFUSE_MAC_1);
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uint8_t mac_bytes[6];
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memcpy(mac_bytes, &mac0, 4);
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memcpy(mac_bytes + 4, &mac1, 2);
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/* Convert to UTF16 string */
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uint16_t* dst = s_str_serial_descr.bString;
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for (int i = 0; i < 6; ++i) {
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uint8_t b = mac_bytes[5 - i]; /* printing from the MSB */
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*dst++ = nibble_to_hex_u16(b >> 4);
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*dst++ = nibble_to_hex_u16(b & 0xf);
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dst++;
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}
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/* Override the pointer to descriptors structure */
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rom_usb_curr_desc = &s_acm_usb_descriptors_override;
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}
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