erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

targets/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /***************************************************************************//**
elessair 0:f269e3021894 2 * @file sleep.c
elessair 0:f269e3021894 3 *******************************************************************************
elessair 0:f269e3021894 4 * @section License
elessair 0:f269e3021894 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
elessair 0:f269e3021894 6 *******************************************************************************
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * SPDX-License-Identifier: Apache-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
elessair 0:f269e3021894 11 * not use this file except in compliance with the License.
elessair 0:f269e3021894 12 * You may obtain a copy of the License at
elessair 0:f269e3021894 13 *
elessair 0:f269e3021894 14 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 15 *
elessair 0:f269e3021894 16 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
elessair 0:f269e3021894 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 19 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 20 * limitations under the License.
elessair 0:f269e3021894 21 *
elessair 0:f269e3021894 22 ******************************************************************************/
elessair 0:f269e3021894 23
elessair 0:f269e3021894 24 #include "device.h"
elessair 0:f269e3021894 25 #if DEVICE_SLEEP
elessair 0:f269e3021894 26
elessair 0:f269e3021894 27 #include "sleep_api.h"
elessair 0:f269e3021894 28 #include "sleepmodes.h"
elessair 0:f269e3021894 29 #include "cmsis.h"
elessair 0:f269e3021894 30 #include "em_emu.h"
elessair 0:f269e3021894 31 #include "critical.h"
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0};
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 /**
elessair 0:f269e3021894 36 * Sleep mode.
elessair 0:f269e3021894 37 * Enter the lowest possible sleep mode that is not blocked by ongoing activity.
elessair 0:f269e3021894 38 */
elessair 0:f269e3021894 39 void sleep(void)
elessair 0:f269e3021894 40 {
elessair 0:f269e3021894 41 if (sleep_block_counter[0] > 0) {
elessair 0:f269e3021894 42 /* Blocked everything below EM0, so just return */
elessair 0:f269e3021894 43 return;
elessair 0:f269e3021894 44 } else if (sleep_block_counter[1] > 0) {
elessair 0:f269e3021894 45 /* Blocked everything below EM1, enter EM1 */
elessair 0:f269e3021894 46 EMU_EnterEM1();
elessair 0:f269e3021894 47 } else if (sleep_block_counter[2] > 0) {
elessair 0:f269e3021894 48 /* Blocked everything below EM2, enter EM2 */
elessair 0:f269e3021894 49 EMU_EnterEM2(true);
elessair 0:f269e3021894 50 } else {
elessair 0:f269e3021894 51 /* Blocked everything below EM3, enter EM3 */
elessair 0:f269e3021894 52 EMU_EnterEM3(true);
elessair 0:f269e3021894 53 } /* Never enter EM4, as mbed has no way of configuring EM4 wakeup */
elessair 0:f269e3021894 54 return;
elessair 0:f269e3021894 55 }
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 /**
elessair 0:f269e3021894 58 * Deep Sleep mode.
elessair 0:f269e3021894 59 * Enter Energy Mode 2, turning off all high-frequency clocks.
elessair 0:f269e3021894 60 *
elessair 0:f269e3021894 61 * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
elessair 0:f269e3021894 62 * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
elessair 0:f269e3021894 63 * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still
elessair 0:f269e3021894 64 * available. This gives a high degree of autonomous operation with a current
elessair 0:f269e3021894 65 * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out
elessair 0:f269e3021894 66 * Detection and full RAM and CPU retention is also included.
elessair 0:f269e3021894 67 */
elessair 0:f269e3021894 68 void deepsleep(void)
elessair 0:f269e3021894 69 {
elessair 0:f269e3021894 70 EMU_EnterEM2(true);
elessair 0:f269e3021894 71 }
elessair 0:f269e3021894 72
elessair 0:f269e3021894 73 /** Block the microcontroller from sleeping below a certain mode
elessair 0:f269e3021894 74 *
elessair 0:f269e3021894 75 * This will block sleep() from entering an energy mode below the one given.
elessair 0:f269e3021894 76 * -- To be called by peripheral HAL's --
elessair 0:f269e3021894 77 *
elessair 0:f269e3021894 78 * After the peripheral is finished with the operation, it should call unblock with the same state
elessair 0:f269e3021894 79 *
elessair 0:f269e3021894 80 */
elessair 0:f269e3021894 81 void blockSleepMode(sleepstate_enum minimumMode)
elessair 0:f269e3021894 82 {
elessair 0:f269e3021894 83 core_util_critical_section_enter();
elessair 0:f269e3021894 84 sleep_block_counter[minimumMode]++;
elessair 0:f269e3021894 85 core_util_critical_section_exit();
elessair 0:f269e3021894 86 }
elessair 0:f269e3021894 87
elessair 0:f269e3021894 88 /** Unblock the microcontroller from sleeping below a certain mode
elessair 0:f269e3021894 89 *
elessair 0:f269e3021894 90 * This will unblock sleep() from entering an energy mode below the one given.
elessair 0:f269e3021894 91 * -- To be called by peripheral HAL's --
elessair 0:f269e3021894 92 *
elessair 0:f269e3021894 93 * This should be called after all transactions on a peripheral are done.
elessair 0:f269e3021894 94 */
elessair 0:f269e3021894 95 void unblockSleepMode(sleepstate_enum minimumMode)
elessair 0:f269e3021894 96 {
elessair 0:f269e3021894 97 core_util_critical_section_enter();
elessair 0:f269e3021894 98 if(sleep_block_counter[minimumMode] > 0) {
elessair 0:f269e3021894 99 sleep_block_counter[minimumMode]--;
elessair 0:f269e3021894 100 }
elessair 0:f269e3021894 101 core_util_critical_section_exit();
elessair 0:f269e3021894 102 }
elessair 0:f269e3021894 103
elessair 0:f269e3021894 104 #endif