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targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF51/lp_ticker.c@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
mbed-dev library. Release version 162

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /* mbed Microcontroller Library
Anna Bridge 186:707f6e361f3e 2 * Copyright (c) 2015 ARM Limited
Anna Bridge 186:707f6e361f3e 3 *
Anna Bridge 186:707f6e361f3e 4 * Licensed under the Apache License, Version 2.0 (the "License");
Anna Bridge 186:707f6e361f3e 5 * you may not use this file except in compliance with the License.
Anna Bridge 186:707f6e361f3e 6 * You may obtain a copy of the License at
Anna Bridge 186:707f6e361f3e 7 *
Anna Bridge 186:707f6e361f3e 8 * http://www.apache.org/licenses/LICENSE-2.0
Anna Bridge 186:707f6e361f3e 9 *
Anna Bridge 186:707f6e361f3e 10 * Unless required by applicable law or agreed to in writing, software
Anna Bridge 186:707f6e361f3e 11 * distributed under the License is distributed on an "AS IS" BASIS,
Anna Bridge 186:707f6e361f3e 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Anna Bridge 186:707f6e361f3e 13 * See the License for the specific language governing permissions and
Anna Bridge 186:707f6e361f3e 14 * limitations under the License.
Anna Bridge 186:707f6e361f3e 15 */
Anna Bridge 186:707f6e361f3e 16 #include "lp_ticker_api.h"
Anna Bridge 186:707f6e361f3e 17 #include "common_rtc.h"
Anna Bridge 186:707f6e361f3e 18 #include "platform/mbed_critical.h"
Anna Bridge 186:707f6e361f3e 19
Anna Bridge 186:707f6e361f3e 20 #if DEVICE_LPTICKER
Anna Bridge 186:707f6e361f3e 21
Anna Bridge 186:707f6e361f3e 22 /* LP ticker is driven by 32kHz clock and counter length is 24 bits. */
Anna Bridge 186:707f6e361f3e 23 const ticker_info_t* lp_ticker_get_info()
Anna Bridge 186:707f6e361f3e 24 {
Anna Bridge 186:707f6e361f3e 25 static const ticker_info_t info = {
Anna Bridge 186:707f6e361f3e 26 RTC_FREQ,
Anna Bridge 186:707f6e361f3e 27 RTC_COUNTER_BITS
Anna Bridge 186:707f6e361f3e 28 };
Anna Bridge 186:707f6e361f3e 29 return &info;
Anna Bridge 186:707f6e361f3e 30 }
Anna Bridge 186:707f6e361f3e 31
Anna Bridge 186:707f6e361f3e 32 void lp_ticker_init(void)
Anna Bridge 186:707f6e361f3e 33 {
Anna Bridge 186:707f6e361f3e 34 common_rtc_init();
Anna Bridge 186:707f6e361f3e 35 }
Anna Bridge 186:707f6e361f3e 36
Anna Bridge 186:707f6e361f3e 37 void lp_ticker_free(void)
Anna Bridge 186:707f6e361f3e 38 {
Anna Bridge 186:707f6e361f3e 39 // A common counter is used for RTC, lp_ticker and us_ticker, so it can't be
Anna Bridge 186:707f6e361f3e 40 // disabled here, but this does not cause any extra cost.
Anna Bridge 186:707f6e361f3e 41 }
Anna Bridge 186:707f6e361f3e 42
Anna Bridge 186:707f6e361f3e 43 uint32_t lp_ticker_read()
Anna Bridge 186:707f6e361f3e 44 {
Anna Bridge 186:707f6e361f3e 45 return nrf_rtc_counter_get(COMMON_RTC_INSTANCE);
Anna Bridge 186:707f6e361f3e 46 }
Anna Bridge 186:707f6e361f3e 47
Anna Bridge 186:707f6e361f3e 48 void lp_ticker_set_interrupt(timestamp_t timestamp)
Anna Bridge 186:707f6e361f3e 49 {
Anna Bridge 186:707f6e361f3e 50 common_rtc_set_interrupt(timestamp,
Anna Bridge 186:707f6e361f3e 51 LP_TICKER_CC_CHANNEL, LP_TICKER_INT_MASK);
Anna Bridge 186:707f6e361f3e 52 }
Anna Bridge 186:707f6e361f3e 53
Anna Bridge 186:707f6e361f3e 54 void lp_ticker_fire_interrupt(void)
Anna Bridge 186:707f6e361f3e 55 {
Anna Bridge 186:707f6e361f3e 56 core_util_critical_section_enter();
Anna Bridge 186:707f6e361f3e 57
Anna Bridge 186:707f6e361f3e 58 lp_ticker_interrupt_fire = true;
Anna Bridge 186:707f6e361f3e 59
Anna Bridge 186:707f6e361f3e 60 NVIC_SetPendingIRQ(RTC1_IRQn);
Anna Bridge 186:707f6e361f3e 61
Anna Bridge 186:707f6e361f3e 62 core_util_critical_section_exit();
Anna Bridge 186:707f6e361f3e 63 }
Anna Bridge 186:707f6e361f3e 64
Anna Bridge 186:707f6e361f3e 65 void lp_ticker_disable_interrupt(void)
Anna Bridge 186:707f6e361f3e 66 {
Anna Bridge 186:707f6e361f3e 67 nrf_rtc_int_disable(COMMON_RTC_INSTANCE, LP_TICKER_INT_MASK);
Anna Bridge 186:707f6e361f3e 68 }
Anna Bridge 186:707f6e361f3e 69
Anna Bridge 186:707f6e361f3e 70 void lp_ticker_clear_interrupt(void)
Anna Bridge 186:707f6e361f3e 71 {
Anna Bridge 186:707f6e361f3e 72 nrf_rtc_event_clear(COMMON_RTC_INSTANCE, LP_TICKER_EVENT);
Anna Bridge 186:707f6e361f3e 73 }
Anna Bridge 186:707f6e361f3e 74
Anna Bridge 186:707f6e361f3e 75 #endif // DEVICE_LPTICKER