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Merge pull request #10387 from SemjonKerner/fix_nrf52_hwrng

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cpu/nrf5x: fix hwrng hang
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Martine Lenders 2018-11-14 13:39:34 +01:00 committed by GitHub
commit a98edd33a0
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1 changed files with 3 additions and 0 deletions
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3
cpu/nrf5x_common/periph/hwrng.c
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@ -39,6 +39,7 @@ void hwrng_read(void *buf, unsigned int num)
#ifdef CPU_FAM_NRF51 #ifdef CPU_FAM_NRF51
NRF_RNG->POWER = 1; NRF_RNG->POWER = 1;
#endif #endif
NRF_RNG->INTENSET = RNG_INTENSET_VALRDY_Msk;
NRF_RNG->TASKS_START = 1; NRF_RNG->TASKS_START = 1;
/* read the actual random data */ /* read the actual random data */
@ -51,9 +52,11 @@ void hwrng_read(void *buf, unsigned int num)
b[count++] = (uint8_t)NRF_RNG->VALUE; b[count++] = (uint8_t)NRF_RNG->VALUE;
/* NRF51 PAN #21 -> read value before clearing VALRDY */ /* NRF51 PAN #21 -> read value before clearing VALRDY */
NRF_RNG->EVENTS_VALRDY = 0; NRF_RNG->EVENTS_VALRDY = 0;
NVIC_ClearPendingIRQ(RNG_IRQn);
} }
/* power off RNG */ /* power off RNG */
NRF_RNG->INTENCLR = RNG_INTENSET_VALRDY_Msk;
NRF_RNG->TASKS_STOP = 1; NRF_RNG->TASKS_STOP = 1;
#ifdef CPU_FAM_NRF51 #ifdef CPU_FAM_NRF51
NRF_RNG->POWER = 0; NRF_RNG->POWER = 0;