Chapter 2. API Reference
• [in] number_of_keys: The number of keys to write (up to 6 keys).
esp_err_t esp_secure_boot_read_key_digests(ets_secure_boot_key_digests_t *trusted_keys)
Read key digests from efuse. Any revoked/missing digests will be marked as NULL.
Return
• ESP_OK: Successful.
• ESP_FAIL: If trusted_keys is NULL or there is no valid digest.
Parameters
• [out] trusted_keys: The number of digest in range 0..2
Structures
struct esp_efuse_desc_t
Type definition for an eFuse field.
Public Members
esp_efuse_block_t efuse_block : 8
Block of eFuse
uint8_t bit_start
Start bit [0..255]
uint16_t bit_count
Length of bit field [1..-]
Macros
ESP_ERR_EFUSE
Base error code for efuse api.
ESP_OK_EFUSE_CNT
OK the required number of bits is set.
ESP_ERR_EFUSE_CNT_IS_FULL
Error field is full.
ESP_ERR_EFUSE_REPEATED_PROG
Error repeated programming of programmed bits is strictly forbidden.
ESP_ERR_CODING
Error while a encoding operation.
ESP_ERR_NOT_ENOUGH_UNUSED_KEY_BLOCKS
Error not enough unused key blocks available
ESP_ERR_DAMAGED_READING
Error. Burn or reset was done during a reading operation leads to damage read data. This error is internal to
the efuse component and not returned by any public API.
Enumerations
enum esp_efuse_rom_log_scheme_t
Type definition for ROM log scheme.
Values:
ESP_EFUSE_ROM_LOG_ALWAYS_ON
Always enable ROM logging
ESP_EFUSE_ROM_LOG_ON_GPIO_LOW
ROM logging is enabled when specific GPIO level is low during start up
ESP_EFUSE_ROM_LOG_ON_GPIO_HIGH
ROM logging is enabled when specific GPIO level is high during start up
Espressif Systems 824
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