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doc: Update hmac article

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KonstantinKondrashov 2023-01-03 23:30:36 +08:00
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docs/en/api-reference/peripherals/hmac.rst
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@ -104,6 +104,14 @@ Setup
.. note:: The API *esp_efuse_write_field_cnt(ESP_EFUSE_SOFT_DIS_JTAG, ESP_EFUSE_SOFT_DIS_JTAG[0]->bit_count)* can be used to burn "soft JTAG disable" bits on {IDF_TARGET_NAME}.
.. only:: esp32s2 or esp32s3
.. note:: If ``HARD_DIS_JTAG`` eFuse is set, then ``SOFT_DIS_JTAG`` functionality does not work because JTAG is permanently disabled.
.. only:: not esp32s2 and not esp32s3
.. note:: If ``DIS_PAD_JTAG`` eFuse is set, then ``SOFT_DIS_JTAG`` functionality does not work because JTAG is permanently disabled.
JTAG enable
1. The key to re-enable JTAG is the output of the HMAC-SHA256 function using the secret key in eFuse and 32 0x00 bytes as the message.