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refactor(rng): move rng read data function to rng_ll.h and update docs of RNG source

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gaoxu
2026-05-13 15:09:55 +08:00
parent 3d7a643ff7
commit 07aaba7c7b
18 changed files with 338 additions and 22 deletions
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10
docs/en/api-reference/system/random.rst
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@@ -12,11 +12,15 @@ Every 32-bit value that the system reads from the RNG_DATA_REG register of the r
.. only:: SOC_WIFI_SUPPORTED or SOC_IEEE802154_SUPPORTED or SOC_BT_SUPPORTED
- Thermal noise comes from the high-speed ADC or SAR ADC or both. Whenever the high-speed ADC or SAR ADC is enabled, bit streams will be generated and fed into the random number generator through an XOR logic gate as random seeds.
- Noise comes from the high-speed ADC, the SAR ADC, or both. When the high-speed ADC or SAR ADC is enabled, the generated bit streams are fed into the random number generator through an XOR logic gate as random seeds.
.. only:: not SOC_WIFI_SUPPORTED and not SOC_IEEE802154_SUPPORTED and not SOC_BT_SUPPORTED
.. only:: esp32p4
- Thermal noise comes from the SAR ADC. Whenever the SAR ADC is enabled, bit streams will be generated and fed into the random number generator through an XOR logic gate as random seeds.
- Thermal noise comes from count values generated by the ring oscillator (BUF_CHAIN) implemented with BUF_CELL, together with the SAR ADC entropy source. Both act as entropy sources to generate random numbers.
.. only:: esp32s31
- Thermal noise comes from multiple entropy sources, including the ring oscillator (BUF_CHAIN) implemented with BUF_CELL, the RFADC, the SAR ADC, and the 40 MHz clock. Their outputs are continuously processed through CRC32 calculations and fed into the random number generator.
.. only:: not esp32