1 // Copyright 2021 Espressif Systems (Shanghai) CO LTD
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #include "esp_rom_efuse.h"
16 
esp_crc8(uint8_t const * p,uint32_t len)17 static uint8_t esp_crc8(uint8_t const * p, uint32_t len)
18 {
19     unsigned char i = 0;
20     unsigned char crc = 0;
21 
22     while (len--) {
23         crc = crc ^ (*p++);
24 
25         for (i = 0; i < 8; i++) {
26             if ((crc) & 0x01) {
27                 crc = (crc >> 1) ^ (0x8c) ;
28             } else {
29                 crc = crc >> 1;
30             }
31         }
32     }
33 
34     return (crc);
35 }
36 
esp_rom_efuse_mac_address_crc8(const uint8_t * data,uint32_t len)37 uint8_t esp_rom_efuse_mac_address_crc8(const uint8_t *data, uint32_t len)
38 {
39     return esp_crc8(data, len);
40 }
41 
esp_rom_efuse_get_flash_gpio_info(void)42 uint32_t esp_rom_efuse_get_flash_gpio_info(void)
43 {
44     return 0;
45 }
46 
esp_rom_efuse_get_flash_wp_gpio(void)47 uint32_t esp_rom_efuse_get_flash_wp_gpio(void)
48 {
49     return 0;
50 }
51 
esp_rom_efuse_is_secure_boot_enabled(void)52 bool esp_rom_efuse_is_secure_boot_enabled(void)
53 {
54     return false;
55 }
56