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rng: fix clock error handling, based on RM.

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According to L4/L0/G0 RM, in case of clock error, interrupt flag must
be cleared, and CECS flag should be cleared as soon as clock meets
requirement.

Reviewed-on: https://github.com/libopencm3/libopencm3/pull/1062
This commit is contained in:
Guillaume Revaillot 2019-02-05 17:22:55 +01:00 committed by Karl Palsson
parent 5866852a90
commit a8a92b4c11
1 changed files with 7 additions and 0 deletions
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7
lib/stm32/common/rng_common_v1.c
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@ -87,6 +87,9 @@ bool rng_get_random(uint32_t *rand_nr)
* Get a random number and block until it works. * Get a random number and block until it works.
* Unless you have a clock problem, this should always return "promptly" * Unless you have a clock problem, this should always return "promptly"
* If you have a clock problem, you will wait here forever! * If you have a clock problem, you will wait here forever!
* Check device RM for clock requirements (usually fRNGCLK > fHCLK/16 or
* fRNGCLK > fHCLK/32
* @returns a random 32bit number * @returns a random 32bit number
*/ */
uint32_t rng_get_random_blocking(void) uint32_t rng_get_random_blocking(void)
@ -104,6 +107,10 @@ uint32_t rng_get_random_blocking(void)
RNG_CR |= RNG_CR_RNGEN; RNG_CR |= RNG_CR_RNGEN;
} }
if (RNG_SR & RNG_SR_CEIS) {
RNG_SR = RNG_SR & ~RNG_SR_CEIS;
}
done = rng_get_random(&rv); done = rng_get_random(&rv);
} while (!done); } while (!done);