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documentation: document esp32s2-saola-1:efuse defconfig

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Adds description for the efuse defconfig on esp32s2-saola-1 board.

Signed-off-by: Filipe Cavalcanti <filipe.cavalcanti@espressif.com>
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Filipe Cavalcanti 2026-02-20 11:16:51 -03:00 • committed by simbit18
parent 2916e091ff
commit 76e1c97642
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36
Documentation/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.rst
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@ -232,6 +232,42 @@ was successful by running ``cxxtest``::
Invalid file! /invalid
File /proc/version exists!
efuse
-----
This configuration demonstrates the use of the E-Fuse driver. It can be accessed
through the ``/dev/efuse`` device file.
Virtual E-Fuse mode can be used by enabling `CONFIG_ESPRESSIF_EFUSE_VIRTUAL`
option to prevent possible damages on chip.
The following snippet demonstrates how to read MAC address:
.. code-block:: C
int fd;
int ret;
uint8_t mac[6];
struct efuse_param_s param;
struct efuse_desc_s mac_addr =
{
.bit_offset = 1,
.bit_count = 48
};
const efuse_desc_t* desc[] =
{
&mac_addr,
NULL
};
param.field = desc;
param.size = 48;
param.data = mac;
fd = open("/dev/efuse", O_RDONLY);
ret = ioctl(fd, EFUSEIOC_READ_FIELD, &param);
To find offset and count variables for related E-Fuse, please refer to Espressif's Technical Reference Manuals.
gpio
----