Chapter 2. API Reference
• esp_efuse_set_key_purpose() - Sets a key purpose for an eFuse key block.
• esp_efuse_set_keypurpose_dis_write() - Sets a write protection of the key purpose field for an
eFuse key block.
• esp_efuse_find_unused_key_block() - Search for an unused key block and return the first one
found.
• esp_efuse_count_unused_key_blocks() - Returns the number of unused eFuse key blocks in the
range EFUSE_BLK_KEY0..EFUSE_BLK_KEY_MAX
• esp_efuse_get_digest_revoke() - Returns the status of the Secure Boot public key digest revoca-
tion bit.
• esp_efuse_set_digest_revoke() - Sets the Secure Boot public key digest revocation bit.
• esp_efuse_get_write_protect_of_digest_revoke() - Returns a write protection of the Se-
cure Boot public key digest revocation bit.
• esp_efuse_set_write_protect_of_digest_revoke() - Sets a write protection of the Secure
Boot public key digest revocation bit.
How to add a new field
1. Find a free bits for field. Show esp_efuse_table.csv file or run idf.py show-efuse-table or the next
command:
$ ./efuse_table_gen.py esp32s2/esp_efuse_table.csv --info
eFuse coding scheme: NONE
# field_name efuse_block bit_start bit_count
1 WR_DIS_FLASH_CRYPT_CNT EFUSE_BLK0 2 1
2 WR_DIS_BLK1 EFUSE_BLK0 7 1
3 WR_DIS_BLK2 EFUSE_BLK0 8 1
4 WR_DIS_BLK3 EFUSE_BLK0 9 1
5 RD_DIS_BLK1 EFUSE_BLK0 16 1
6 RD_DIS_BLK2 EFUSE_BLK0 17 1
7 RD_DIS_BLK3 EFUSE_BLK0 18 1
8 FLASH_CRYPT_CNT EFUSE_BLK0 20 7
9 MAC_FACTORY EFUSE_BLK0 32 8
10 MAC_FACTORY EFUSE_BLK0 40 8
11 MAC_FACTORY EFUSE_BLK0 48 8
12 MAC_FACTORY EFUSE_BLK0 56 8
13 MAC_FACTORY EFUSE_BLK0 64 8
14 MAC_FACTORY EFUSE_BLK0 72 8
15 MAC_FACTORY_CRC EFUSE_BLK0 80 8
16 CHIP_VER_DIS_APP_CPU EFUSE_BLK0 96 1
17 CHIP_VER_DIS_BT EFUSE_BLK0 97 1
18 CHIP_VER_PKG EFUSE_BLK0 105 3
19 CHIP_CPU_FREQ_LOW EFUSE_BLK0 108 1
20 CHIP_CPU_FREQ_RATED EFUSE_BLK0 109 1
21 CHIP_VER_REV1 EFUSE_BLK0 111 1
22 ADC_VREF_AND_SDIO_DREF EFUSE_BLK0 136 6
23 XPD_SDIO_REG EFUSE_BLK0 142 1
24 SDIO_TIEH EFUSE_BLK0 143 1
25 SDIO_FORCE EFUSE_BLK0 144 1
26 ENCRYPT_CONFIG EFUSE_BLK0 188 4
27 CONSOLE_DEBUG_DISABLE EFUSE_BLK0 194 1
28 ABS_DONE_0 EFUSE_BLK0 196 1
29 DISABLE_JTAG EFUSE_BLK0 198 1
30 DISABLE_DL_ENCRYPT EFUSE_BLK0 199 1
31 DISABLE_DL_DECRYPT EFUSE_BLK0 200 1
32 DISABLE_DL_CACHE EFUSE_BLK0 201 1
33 ENCRYPT_FLASH_KEY EFUSE_BLK1 0 256
34 SECURE_BOOT_KEY EFUSE_BLK2 0 256
35 MAC_CUSTOM_CRC EFUSE_BLK3 0 8
36 MAC_CUSTOM EFUSE_BLK3 8 48
37 ADC1_TP_LOW EFUSE_BLK3 96 7
(continues on next page)
Espressif Systems 809
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