/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include <assert.h>
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#include <stdint.h>
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#include <hal/nrf_clock.h>
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#include <time_machine.h>
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#include "mcu/nrf52_hal.h"
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#include "nrfx.h"
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#include "nimble_syscfg.h"
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#include "os/os.h"
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static uint8_t nrf52_clock_hfxo_refcnt;
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/**
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* Request HFXO clock be turned on. Note that each request must have a
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* corresponding release.
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*
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* @return int 0: hfxo was already on. 1: hfxo was turned on.
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*/
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int
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nrf52_clock_hfxo_request(void)
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{
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int started;
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uint32_t ctx;
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#if MYNEWT_VAL_CHOICE(MCU_HFCLK_SOURCE, HFINT)
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/* Cannot enable/disable hfxo if it is not present */
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assert(0);
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#endif
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started = 0;
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__HAL_DISABLE_INTERRUPTS(ctx);
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assert(nrf52_clock_hfxo_refcnt < 0xff);
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if (nrf52_clock_hfxo_refcnt == 0) {
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/* Check the current STATE and SRC of HFCLK */
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if ((NRF_CLOCK->HFCLKSTAT &
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(CLOCK_HFCLKSTAT_SRC_Msk | CLOCK_HFCLKSTAT_STATE_Msk)) !=
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(CLOCK_HFCLKSTAT_SRC_Xtal << CLOCK_HFCLKSTAT_SRC_Pos |
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CLOCK_HFCLKSTAT_STATE_Running << CLOCK_HFCLKSTAT_STATE_Pos)) {
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NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
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nrf_clock_task_trigger(NRF_CLOCK, NRF_CLOCK_TASK_HFCLKSTART);
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while (!NRF_CLOCK->EVENTS_HFCLKSTARTED) {
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#if BABBLESIM
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tm_tick();
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#endif
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}
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}
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started = 1;
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}
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++nrf52_clock_hfxo_refcnt;
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__HAL_ENABLE_INTERRUPTS(ctx);
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return started;
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}
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/**
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* Release the HFXO. This means that the caller no longer needs the HFXO to be
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* turned on. Each call to release should have been preceeded by a corresponding
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* call to request the HFXO
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*
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*
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* @return int 0: HFXO not stopped by this call (others using it) 1: HFXO
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* stopped.
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*/
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int
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nrf52_clock_hfxo_release(void)
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{
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int stopped;
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uint32_t ctx;
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#if MYNEWT_VAL_CHOICE(MCU_HFCLK_SOURCE, HFINT)
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/* Cannot enable/disable hfxo if it is not present */
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assert(0);
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#endif
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stopped = 0;
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__HAL_DISABLE_INTERRUPTS(ctx);
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assert(nrf52_clock_hfxo_refcnt != 0);
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--nrf52_clock_hfxo_refcnt;
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if (nrf52_clock_hfxo_refcnt == 0) {
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nrf_clock_task_trigger(NRF_CLOCK, NRF_CLOCK_TASK_HFCLKSTOP);
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stopped = 1;
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}
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__HAL_ENABLE_INTERRUPTS(ctx);
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return stopped;
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}
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