ac74d8b652
Replace the existing Apache 2.0 boilerplate header with an SPDX tag throughout the zephyr code tree. This patch was generated via a script run over the master branch. Also updated doc/porting/application.rst that had a dependency on line numbers in a literal include. Manually updated subsys/logging/sys_log.c that had a malformed header in the original file. Also cleanup several cases that already had a SPDX tag and we either got a duplicate or missed updating. Jira: ZEP-1457 Change-Id: I6131a1d4ee0e58f5b938300c2d2fc77d2e69572c Signed-off-by: David B. Kinder <david.b.kinder@intel.com> Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
117 lines
1.9 KiB
C
117 lines
1.9 KiB
C
/*
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* Copyright (c) 2016 Nordic Semiconductor ASA
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* Copyright (c) 2016 Vinayak Kariappa Chettimada
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <soc.h>
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#include "rand.h"
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#include <bluetooth/log.h>
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#include "debug.h"
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#define RAND_RESERVED (4)
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struct rand {
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uint8_t count;
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uint8_t first;
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uint8_t last;
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uint8_t rand[1];
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};
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static struct rand *rng;
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void rand_init(uint8_t *context, uint8_t context_len)
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{
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LL_ASSERT(context_len > sizeof(struct rand));
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rng = (struct rand *)context;
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rng->count = context_len - sizeof(struct rand) + 1;
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rng->first = rng->last = 0;
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NRF_RNG->CONFIG = RNG_CONFIG_DERCEN_Msk;
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NRF_RNG->EVENTS_VALRDY = 0;
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NRF_RNG->INTENSET = RNG_INTENSET_VALRDY_Msk;
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NRF_RNG->TASKS_START = 1;
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}
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size_t rand_get(size_t octets, uint8_t *rand)
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{
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uint8_t reserved;
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uint8_t first;
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while (octets) {
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if (rng->first == rng->last) {
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break;
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}
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rand[--octets] = rng->rand[rng->first];
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first = rng->first + 1;
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if (first == rng->count) {
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first = 0;
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}
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rng->first = first;
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}
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reserved = RAND_RESERVED;
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first = rng->first;
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while (reserved--) {
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if (first == rng->last) {
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NRF_RNG->TASKS_START = 1;
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break;
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}
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first++;
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if (first == rng->count) {
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first = 0;
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}
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}
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return octets;
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}
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void isr_rand(void *param)
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{
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ARG_UNUSED(param);
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if (NRF_RNG->EVENTS_VALRDY) {
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uint8_t last;
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last = rng->last + 1;
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if (last == rng->count) {
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last = 0;
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}
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if (last == rng->first) {
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/* this condition should not happen
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* , but due to probable bug in HW
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* , new value could be generated
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* before task is stopped.
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*/
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NRF_RNG->TASKS_STOP = 1;
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NRF_RNG->EVENTS_VALRDY = 0;
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return;
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}
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rng->rand[rng->last] = NRF_RNG->VALUE;
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rng->last = last;
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last = rng->last + 1;
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if (last == rng->count) {
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last = 0;
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}
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NRF_RNG->EVENTS_VALRDY = 0;
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if (last == rng->first) {
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NRF_RNG->TASKS_STOP = 1;
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}
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}
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}
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