mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
Parent:
22:9c52de9bc1d7 
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 2 * @file sleep.c
<> 144:ef7eb2e8f9f7 3 *******************************************************************************
<> 144:ef7eb2e8f9f7 4 * @section License
<> 144:ef7eb2e8f9f7 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
<> 144:ef7eb2e8f9f7 6 *******************************************************************************
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * SPDX-License-Identifier: Apache-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 144:ef7eb2e8f9f7 11 * not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 12 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 13 *
<> 144:ef7eb2e8f9f7 14 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 144:ef7eb2e8f9f7 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 19 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 20 * limitations under the License.
<> 144:ef7eb2e8f9f7 21 *
<> 144:ef7eb2e8f9f7 22 ******************************************************************************/
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 #include "device.h"
<> 144:ef7eb2e8f9f7 25 #if DEVICE_SLEEP
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 #include "sleep_api.h"
<> 144:ef7eb2e8f9f7 28 #include "sleepmodes.h"
<> 144:ef7eb2e8f9f7 29 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 30 #include "em_emu.h"
<> 144:ef7eb2e8f9f7 31 #include "critical.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0};
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 /**
<> 144:ef7eb2e8f9f7 36 * Sleep mode.
<> 144:ef7eb2e8f9f7 37 * Enter the lowest possible sleep mode that is not blocked by ongoing activity.
<> 144:ef7eb2e8f9f7 38 */
<> 144:ef7eb2e8f9f7 39 void sleep(void)
<> 144:ef7eb2e8f9f7 40 {
<> 144:ef7eb2e8f9f7 41 if (sleep_block_counter[0] > 0) {
<> 144:ef7eb2e8f9f7 42 /* Blocked everything below EM0, so just return */
<> 144:ef7eb2e8f9f7 43 return;
<> 144:ef7eb2e8f9f7 44 } else if (sleep_block_counter[1] > 0) {
<> 144:ef7eb2e8f9f7 45 /* Blocked everything below EM1, enter EM1 */
<> 144:ef7eb2e8f9f7 46 EMU_EnterEM1();
<> 144:ef7eb2e8f9f7 47 } else if (sleep_block_counter[2] > 0) {
<> 144:ef7eb2e8f9f7 48 /* Blocked everything below EM2, enter EM2 */
<> 144:ef7eb2e8f9f7 49 EMU_EnterEM2(true);
<> 144:ef7eb2e8f9f7 50 } else {
<> 144:ef7eb2e8f9f7 51 /* Blocked everything below EM3, enter EM3 */
<> 144:ef7eb2e8f9f7 52 EMU_EnterEM3(true);
<> 144:ef7eb2e8f9f7 53 } /* Never enter EM4, as mbed has no way of configuring EM4 wakeup */
<> 144:ef7eb2e8f9f7 54 return;
<> 144:ef7eb2e8f9f7 55 }
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 /**
<> 144:ef7eb2e8f9f7 58 * Deep Sleep mode.
<> 144:ef7eb2e8f9f7 59 * Enter Energy Mode 2, turning off all high-frequency clocks.
<> 144:ef7eb2e8f9f7 60 *
<> 144:ef7eb2e8f9f7 61 * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
<> 144:ef7eb2e8f9f7 62 * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
<> 144:ef7eb2e8f9f7 63 * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still
<> 144:ef7eb2e8f9f7 64 * available. This gives a high degree of autonomous operation with a current
<> 144:ef7eb2e8f9f7 65 * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out
<> 144:ef7eb2e8f9f7 66 * Detection and full RAM and CPU retention is also included.
<> 144:ef7eb2e8f9f7 67 */
<> 144:ef7eb2e8f9f7 68 void deepsleep(void)
<> 144:ef7eb2e8f9f7 69 {
<> 144:ef7eb2e8f9f7 70 EMU_EnterEM2(true);
<> 144:ef7eb2e8f9f7 71 }
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 /** Block the microcontroller from sleeping below a certain mode
<> 144:ef7eb2e8f9f7 74 *
<> 144:ef7eb2e8f9f7 75 * This will block sleep() from entering an energy mode below the one given.
<> 144:ef7eb2e8f9f7 76 * -- To be called by peripheral HAL's --
<> 144:ef7eb2e8f9f7 77 *
<> 144:ef7eb2e8f9f7 78 * After the peripheral is finished with the operation, it should call unblock with the same state
<> 144:ef7eb2e8f9f7 79 *
<> 144:ef7eb2e8f9f7 80 */
<> 144:ef7eb2e8f9f7 81 void blockSleepMode(sleepstate_enum minimumMode)
<> 144:ef7eb2e8f9f7 82 {
<> 144:ef7eb2e8f9f7 83 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 84 sleep_block_counter[minimumMode]++;
<> 144:ef7eb2e8f9f7 85 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 86 }
<> 144:ef7eb2e8f9f7 87
<> 144:ef7eb2e8f9f7 88 /** Unblock the microcontroller from sleeping below a certain mode
<> 144:ef7eb2e8f9f7 89 *
<> 144:ef7eb2e8f9f7 90 * This will unblock sleep() from entering an energy mode below the one given.
<> 144:ef7eb2e8f9f7 91 * -- To be called by peripheral HAL's --
<> 144:ef7eb2e8f9f7 92 *
<> 144:ef7eb2e8f9f7 93 * This should be called after all transactions on a peripheral are done.
<> 144:ef7eb2e8f9f7 94 */
<> 144:ef7eb2e8f9f7 95 void unblockSleepMode(sleepstate_enum minimumMode)
<> 144:ef7eb2e8f9f7 96 {
<> 144:ef7eb2e8f9f7 97 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 98 if(sleep_block_counter[minimumMode] > 0) {
<> 144:ef7eb2e8f9f7 99 sleep_block_counter[minimumMode]--;
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 102 }
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 #endif