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micropython/docs/samd

History

robert-hh 76cf98c35b samd/mcu: Implement a hardware seed for the SAMD21 random module. By using the phase jitter between the DFLL48M clock and the FDPLL96M clock. Even if both use the same reference source, they have a different jitter. SysTick is driven by FDPLL96M, the us counter by DFLL48M. As a random source, the us counter is read out on every SysTick and the value is used to accumulate a simple multiply, add and xor register. According to tests it creates about 30 bit random bit-flips per second. That mechanism will pass quite a few RNG tests, has a suitable frequency distribution and serves better than just the time after boot to seed the PRNG.		2 years ago
..
img	docs/samd: Add documentation for the samd port.	2 years ago
tutorial	docs/samd: Add documentation for the samd port.	2 years ago
general.rst	docs/samd: Add documentation for the samd port.	2 years ago
pinout.rst	docs/samd/pinout: Fix the pin numbering for the default assignments.	2 years ago
quickref.rst	samd/mcu: Implement a hardware seed for the SAMD21 random module.	2 years ago