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RNG: Delay after an RCC peripheral clock enabling

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mcudev 2017-10-12 15:29:38 -04:00 committed by Pavol Rusnak
parent c5dfa37f3e
commit 7103404b90
1 changed files with 4 additions and 1 deletions
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5
embed/trezorhal/rng.c
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@ -2,7 +2,10 @@
int rng_init(void) int rng_init(void)
{ {
RCC->AHB2ENR |= RCC_AHB2ENR_RNGEN; // enable TRNG peripheral clock // enable TRNG peripheral clock
// use the HAL version due to section 2.1.6 of STM32F42xx Errata sheet
// "Delay after an RCC peripheral clock enabling"
__HAL_RCC_RNG_CLK_ENABLE();
RNG->CR = RNG_CR_RNGEN; // enable TRNG RNG->CR = RNG_CR_RNGEN; // enable TRNG
return 0; return 0;
} }