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esp_hw_support: Clarify the documentation about hardware RNG entropy

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Angus Gratton
2021-05-06 16:59:02 +10:00
parent 3dbafb9a13
commit 4d4e094d81
2 changed files with 26 additions and 14 deletions
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13
components/bootloader_support/include/bootloader_random.h
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@@ -24,13 +24,14 @@ extern "C" {
* @brief Enable early entropy source for RNG
*
* Uses the SAR ADC to feed entropy into the HWRNG. The ADC is put
* into a test mode that reads the 1.1V internal reference source and
* feeds the LSB of data into the HWRNG.
* into a test mode that reads an internal reference voltage and
* constantly feeds the LSB of data into the HWRNG. Consult the
* SoC Technical Reference Manual for more information.
*
* Can also be used from app code early during operation, if entropy
* is required before WiFi stack is initialised. Call this function
* from app code only if WiFi/BT are not yet enabled and I2S and SAR
* ADC are not in use.
* Can also be used from app code early during operation, if true
* random numbers are required before WiFi stack is initialised.
* Call this function from app code only if WiFi/BT are not yet
* enabled and I2S and ADC are not in use.
*
* Call bootloader_random_disable() when done.
*/