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STM32L4: correct RNG clock source #9035

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Merged
merged 1 commit into from
Dec 12, 2018
Merged

STM32L4: correct RNG clock source #9035

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15 changes: 15 additions & 0 deletions targets/TARGET_STM/trng_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,21 @@ void trng_init(trng_t *obj)
error("Only 1 RNG instance supported\r\n");
}

#if defined(RCC_PERIPHCLK_RNG)
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;

/*Select PLLQ output as RNG clock source */
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RNG;
#if ((CLOCK_SOURCE) & USE_PLL_MSI)
PeriphClkInitStruct.RngClockSelection = RCC_RNGCLKSOURCE_MSI;
#else
PeriphClkInitStruct.RngClockSelection = RCC_RNGCLKSOURCE_PLL;
#endif
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
error("RNG clock configuration error\n");
}
#endif

/* RNG Peripheral clock enable */
__HAL_RCC_RNG_CLK_ENABLE();

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