mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
/*
|
|
* Copyright (C) 2017 Freie Universität Berlin
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU Lesser
|
|
* General Public License v2.1. See the file LICENSE in the top level
|
|
* directory for more details.
|
|
*/
|
|
|
|
/**
|
|
* @ingroup cpu_nrf5x_common
|
|
* @{
|
|
*
|
|
* @file
|
|
* @brief Clock initialization code
|
|
*
|
|
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
|
|
* @}
|
|
*/
|
|
|
|
#include "cpu.h"
|
|
#include "irq.h"
|
|
#include "assert.h"
|
|
#include "nrf_clock.h"
|
|
#include "periph_conf.h"
|
|
|
|
/* make HFCLK clock is configured */
|
|
#ifndef CLOCK_HFCLK
|
|
#error "Clock init: CLOCK_HFCLK is not defined by your board!"
|
|
#endif
|
|
|
|
/* Add compatibility wrapper defines for nRF families with Cortex-M33 core */
|
|
#ifdef NRF_CLOCK_S
|
|
#define NRF_CLOCK NRF_CLOCK_S
|
|
#endif
|
|
|
|
static unsigned _hfxo_requests = 0;
|
|
|
|
void clock_init_hf(void)
|
|
{
|
|
/* for the nRF51 we can chose the XTAL frequency */
|
|
#ifdef CPU_FAM_NRF51
|
|
#if (CLOCK_HFCLK == 32)
|
|
NRF_CLOCK->XTALFREQ = CLOCK_XTALFREQ_XTALFREQ_32MHz;
|
|
#elif (CLOCK_HFCLK == 16)
|
|
NRF_CLOCK->XTALFREQ = CLOCK_XTALFREQ_XTALFREQ_16MHz;
|
|
#endif
|
|
#endif
|
|
|
|
/* allow to always enable the HFXO as non-default option */
|
|
#if CLOCK_HFXO_ONBOOT
|
|
clock_hfxo_request();
|
|
#endif
|
|
}
|
|
|
|
void clock_hfxo_request(void)
|
|
{
|
|
unsigned state = irq_disable();
|
|
++_hfxo_requests;
|
|
if (_hfxo_requests == 1) {
|
|
NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
|
|
NRF_CLOCK->TASKS_HFCLKSTART = 1;
|
|
while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0) {}
|
|
}
|
|
irq_restore(state);
|
|
}
|
|
|
|
void clock_hfxo_release(void)
|
|
{
|
|
/* if this function is called while the counter is zero the state in a
|
|
* driver requesting the HFXO is broken! */
|
|
assert(_hfxo_requests);
|
|
|
|
unsigned state = irq_disable();
|
|
--_hfxo_requests;
|
|
if (_hfxo_requests == 0) {
|
|
NRF_CLOCK->TASKS_HFCLKSTOP = 1;
|
|
}
|
|
irq_restore(state);
|
|
}
|
|
|
|
void clock_start_lf(void)
|
|
{
|
|
/* abort if LF clock is already running */
|
|
if (NRF_CLOCK->LFCLKSTAT & CLOCK_LFCLKSTAT_STATE_Msk) {
|
|
return;
|
|
}
|
|
|
|
/* Select LFCLK source */
|
|
NRF_CLOCK->LFCLKSRC = CLOCK_LFCLK;
|
|
|
|
/* enable LF clock */
|
|
NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
|
|
NRF_CLOCK->TASKS_LFCLKSTART = 1;
|
|
while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) {}
|
|
|
|
/* calibrate the RC LF clock if applicable */
|
|
#if (CLOCK_HFCLK && (CLOCK_LFCLK == 0))
|
|
NRF_CLOCK->EVENTS_DONE = 0;
|
|
NRF_CLOCK->TASKS_CAL = 1;
|
|
while (NRF_CLOCK->EVENTS_DONE == 0) {}
|
|
#endif
|
|
}
|
|
|
|
void clock_stop_lf(void)
|
|
{
|
|
NRF_CLOCK->TASKS_LFCLKSTOP = 1;
|
|
while (NRF_CLOCK->LFCLKSTAT & CLOCK_LFCLKSTAT_STATE_Msk) {}
|
|
}
|