Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c@150:02e0a0aed4ec, 2016-11-08 (annotated)

Committer:
<>
Date:
Tue Nov 08 17:45:16 2016 +0000
Revision:
150:02e0a0aed4ec
Parent:
149:156823d33999
Child:
160:d5399cc887bb
This updates the lib to the mbed lib v129

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 "em_emu.h"
<> 144:ef7eb2e8f9f7 30 #include "critical.h"
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0};
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 /**
<> 144:ef7eb2e8f9f7 35 * Sleep mode.
<> 144:ef7eb2e8f9f7 36 * Enter the lowest possible sleep mode that is not blocked by ongoing activity.
<> 144:ef7eb2e8f9f7 37 */
<> 144:ef7eb2e8f9f7 38 void sleep(void)
<> 144:ef7eb2e8f9f7 39 {
<> 144:ef7eb2e8f9f7 40 if (sleep_block_counter[0] > 0) {
<> 144:ef7eb2e8f9f7 41 /* Blocked everything below EM0, so just return */
<> 144:ef7eb2e8f9f7 42 return;
<> 144:ef7eb2e8f9f7 43 } else if (sleep_block_counter[1] > 0) {
<> 144:ef7eb2e8f9f7 44 /* Blocked everything below EM1, enter EM1 */
<> 144:ef7eb2e8f9f7 45 EMU_EnterEM1();
<> 144:ef7eb2e8f9f7 46 } else if (sleep_block_counter[2] > 0) {
<> 144:ef7eb2e8f9f7 47 /* Blocked everything below EM2, enter EM2 */
<> 144:ef7eb2e8f9f7 48 EMU_EnterEM2(true);
<> 144:ef7eb2e8f9f7 49 } else {
<> 144:ef7eb2e8f9f7 50 /* Blocked everything below EM3, enter EM3 */
<> 144:ef7eb2e8f9f7 51 EMU_EnterEM3(true);
<> 144:ef7eb2e8f9f7 52 } /* Never enter EM4, as mbed has no way of configuring EM4 wakeup */
<> 144:ef7eb2e8f9f7 53 return;
<> 144:ef7eb2e8f9f7 54 }
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 /**
<> 144:ef7eb2e8f9f7 57 * Deep Sleep mode.
<> 144:ef7eb2e8f9f7 58 * Enter Energy Mode 2, turning off all high-frequency clocks.
<> 144:ef7eb2e8f9f7 59 *
<> 144:ef7eb2e8f9f7 60 * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
<> 144:ef7eb2e8f9f7 61 * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
<> 144:ef7eb2e8f9f7 62 * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still
<> 144:ef7eb2e8f9f7 63 * available. This gives a high degree of autonomous operation with a current
<> 144:ef7eb2e8f9f7 64 * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out
<> 144:ef7eb2e8f9f7 65 * Detection and full RAM and CPU retention is also included.
<> 144:ef7eb2e8f9f7 66 */
<> 144:ef7eb2e8f9f7 67 void deepsleep(void)
<> 144:ef7eb2e8f9f7 68 {
<> 144:ef7eb2e8f9f7 69 EMU_EnterEM2(true);
<> 144:ef7eb2e8f9f7 70 }
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 /** Block the microcontroller from sleeping below a certain mode
<> 144:ef7eb2e8f9f7 73 *
<> 144:ef7eb2e8f9f7 74 * This will block sleep() from entering an energy mode below the one given.
<> 144:ef7eb2e8f9f7 75 * -- To be called by peripheral HAL's --
<> 144:ef7eb2e8f9f7 76 *
<> 144:ef7eb2e8f9f7 77 * After the peripheral is finished with the operation, it should call unblock with the same state
<> 144:ef7eb2e8f9f7 78 *
<> 144:ef7eb2e8f9f7 79 */
<> 144:ef7eb2e8f9f7 80 void blockSleepMode(sleepstate_enum minimumMode)
<> 144:ef7eb2e8f9f7 81 {
<> 144:ef7eb2e8f9f7 82 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 83 sleep_block_counter[minimumMode]++;
<> 144:ef7eb2e8f9f7 84 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 85 }
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 /** Unblock the microcontroller from sleeping below a certain mode
<> 144:ef7eb2e8f9f7 88 *
<> 144:ef7eb2e8f9f7 89 * This will unblock sleep() from entering an energy mode below the one given.
<> 144:ef7eb2e8f9f7 90 * -- To be called by peripheral HAL's --
<> 144:ef7eb2e8f9f7 91 *
<> 144:ef7eb2e8f9f7 92 * This should be called after all transactions on a peripheral are done.
<> 144:ef7eb2e8f9f7 93 */
<> 144:ef7eb2e8f9f7 94 void unblockSleepMode(sleepstate_enum minimumMode)
<> 144:ef7eb2e8f9f7 95 {
<> 144:ef7eb2e8f9f7 96 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 97 if(sleep_block_counter[minimumMode] > 0) {
<> 144:ef7eb2e8f9f7 98 sleep_block_counter[minimumMode]--;
<> 144:ef7eb2e8f9f7 99 }
<> 144:ef7eb2e8f9f7 100 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 101 }
<> 144:ef7eb2e8f9f7 102
<> 144:ef7eb2e8f9f7 103 #endif