esp-idf/components/esp_rom/esp32s2/usb_patches.c
Ivan Grokhotkov 4a91ccf4ce
esp_rom: implement usb deinit functions added in S3 ROM for S2
This cleans up usb_console.c and prepares it for S3 support.
2023-04-12 11:08:43 +02:00

84 lines
2.4 KiB
C

/*
* SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include "esp32s2/rom/usb/usb_common.h"
#include "soc/soc.h"
#include "hal/efuse_hal.h"
/* USB CDC descriptor.
* Note that we aren't using the one in ROM since it doesn't
* set "serial" to the MAC address.
* However overriding the descriptor is cheap - we can reuse most
* of its components from ROM.
*/
/* This is not const, since the MAC address is only known at run time */
static struct string_descriptor s_str_serial_descr = {
.bLength = 2 + 2 * 17,
.bDescriptorType = 0x03,
.bString={'0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0'}
};
static const struct rom_usb_descriptors s_acm_usb_descriptors_override = {
.device_descr = &general_device_descr,
.config_descr = { &acm_config_descr },
.string_count = 4,
.string0_descr = &string0_descr,
.string_descrs = {
&str_manu_descr,
&str_prod_descr,
&s_str_serial_descr
}
};
static inline uint16_t nibble_to_hex_u16(uint8_t b)
{
if (b < 0xa) {
return '0' + b;
} else {
return 'a' + b - 0xa;
}
}
void rom_usb_cdc_set_descriptor_patch(void)
{
uint8_t mac_bytes[6];
efuse_hal_get_mac(mac_bytes);
/* Convert to UTF16 string */
#pragma GCC diagnostic push
#if __GNUC__ >= 9
#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
#endif
uint16_t* dst = s_str_serial_descr.bString;
for (int i = 0; i < 6; ++i) {
uint8_t b = mac_bytes[5 - i]; /* printing from the MSB */
*dst++ = nibble_to_hex_u16(b >> 4);
*dst++ = nibble_to_hex_u16(b & 0xf);
dst++;
}
#pragma GCC diagnostic pop
/* Override the pointer to descriptors structure */
rom_usb_curr_desc = &s_acm_usb_descriptors_override;
}
/* On ESP32-S2, ROM doesn't provide interfaces to clear usb_dev and usb_dw_ctrl structures.
* Starting from ESP32-S3, usb_dev_deinit and usb_dw_ctrl_deinit ROM functions are available.
* Here we implement the missing functionality for the ESP32-S2.
*/
void usb_dev_deinit(void)
{
extern char rom_usb_dev, rom_usb_dev_end;
memset((void *) &rom_usb_dev, 0, &rom_usb_dev_end - &rom_usb_dev);
}
void usb_dw_ctrl_deinit(void)
{
extern char rom_usb_dw_ctrl, rom_usb_dw_ctrl_end;
memset((void *) &rom_usb_dw_ctrl, 0, &rom_usb_dw_ctrl_end - &rom_usb_dw_ctrl);
}