Espressif ESP32-S2 Programming Manual page 821

Chapter 2. API Reference
38 ADC1_TP_HIGH
39 ADC2_TP_LOW
40 ADC2_TP_HIGH
41 SECURE_VERSION
42 MAC_CUSTOM_VER
Used bits in eFuse table:
EFUSE_BLK0
[2 2] [7 9] [16 18] [20 27] [32 87] [96 97] [105 109] [111 111] [136 144]
191] [194 194] [196 196] [198 201]
→
EFUSE_BLK1
[0 255]
EFUSE_BLK2
[0 255]
EFUSE_BLK3
[0 55] [96 159] [184 191]
Note: Not printed ranges are free for using. (bits in EFUSE_BLK0 are reserved
Espressif)
→
Parsing eFuse CSV input file $IDF_PATH/components/efuse/esp32s2/esp_efuse_table.
csv ...
→
Verifying eFuse table...
The number of bits not included in square brackets is free (bits in EFUSE_BLK0 are reserved for Espressif). All
fields are checked for overlapping.
2. Fill a line for field: field_name, efuse_block, bit_start, bit_count, comment.
3. Run a show_efuse_table command to check eFuse table.
efuse_common_table or efuse_custom_table command.
Debug eFuse & Unit tests
Virtual eFuses The Kconfig option
ager, so writes are emulated and no eFuse values are permanently changed. This can be useful for debugging app and
unit tests. During startup, the eFuses are copied to RAM. All eFuse operations (read and write) are performed with
RAM instead of the real eFuse registers.
In addition to the CONFIG_EFUSE_VIRTUAL
that adds a feature to keep eFuses in flash memory. To use this mode the partition_table should have the efuse
partition. partition.csv: "efuse_em, data, efuse, , 0x2000,". During startup, the eFuses are copied
from flash or, in case if flash is empty, from real eFuse to RAM and then update flash. This option allows keeping
eFuses after reboots (possible to test secure_boot and flash_encryption features with this option).
espefuse.py esptool includes a useful tool for reading/writing ESP32-S2 eFuse bits - espefuse.py.
espefuse.py -p PORT summary
Connecting....
Detecting chip type... ESP32-S2
espefuse.py v3.1-dev
EFUSE_NAME (Block)
Value] [Readable/Writeable] (Hex Value)
→
--------------------------------------------------------------------------
--------------
→
Calibration fuses:
Espressif Systems
EFUSE_BLK3
EFUSE_BLK3
EFUSE_BLK3
EFUSE_BLK3
EFUSE_BLK3
CONFIG_EFUSE_VIRTUAL
option there is CONFIG_EFUSE_VIRTUAL_KEEP_IN_FLASH
Description
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To generate source files run
will virtualize eFuse values inside the eFuse Man-
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option
Release v4.4