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111 lines
2.1 KiB
C
111 lines
2.1 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_nrf51822
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* @{
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*
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* @file rtt.c
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* @brief Real-time timer driver implementation
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "cpu.h"
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#include "board.h"
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#include "sched.h"
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#include "thread.h"
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#include "periph_conf.h"
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#include "periph/rtt.h"
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/* guard file in case no RTC device was specified */
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#if RTT_NUMOF
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/*
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* callback and argument for an active alarm
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*/
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static rtt_alarm_cb_t alarm_cb;
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static void *alarm_arg;
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void rtt_init(void)
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{
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rtt_poweron();
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/* configure interrupt */
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NVIC_SetPriority(RTT_IRQ, RTT_IRQ_PRIO);
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NVIC_EnableIRQ(RTT_IRQ);
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/* set prescaler */
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RTT_DEV->PRESCALER = RTT_PRESCALER;
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/* enable the low-frequency clock */
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NRF_CLOCK->TASKS_LFCLKSTART = 1;
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/* start the actual RTT thing */
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RTT_DEV->TASKS_START = 1;
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}
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uint32_t rtt_get_counter(void)
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{
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return RTT_DEV->COUNTER;
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}
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void rtt_set_counter(uint32_t counter)
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{
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/* not supported for the NRF51822? -> could not find out how to do this */
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}
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void rtt_set_alarm(uint32_t alarm, rtt_alarm_cb_t cb, void *arg)
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{
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alarm_cb = cb;
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alarm_arg = arg;
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RTT_DEV->CC[0] = (alarm & RTT_MAX_VALUE);
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RTT_DEV->INTENSET = RTC_INTENSET_COMPARE0_Msk;
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}
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uint32_t rtt_get_alarm(void)
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{
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return RTT_DEV->CC[0];
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}
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void rtt_clear_alarm(void)
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{
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RTT_DEV->INTENCLR = RTC_INTENSET_COMPARE0_Msk;
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}
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void rtt_poweron(void)
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{
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RTT_DEV->POWER = 1;
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}
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void rtt_poweroff(void)
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{
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RTT_DEV->POWER = 0;
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}
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__attribute__((naked)) void RTT_ISR(void)
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{
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ISR_ENTER();
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if (RTT_DEV->EVENTS_COMPARE[0] ==1) {
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RTT_DEV->EVENTS_COMPARE[0] = 0;
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RTT_DEV->INTENCLR = RTC_INTENSET_COMPARE0_Msk;
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alarm_cb(alarm_arg);
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}
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if (sched_context_switch_request) {
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thread_yield();
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}
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ISR_EXIT();
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}
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#endif /* RTT_NUMOF */
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