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targets/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c
- Committer:
- <>
- Date:
- 2016-10-28
- Revision:
- 149:156823d33999
- Parent:
- targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c@ 144:ef7eb2e8f9f7
- Child:
- 150:02e0a0aed4ec
File content as of revision 149:156823d33999:
/***************************************************************************//** * @file sleep.c ******************************************************************************* * @section License * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> ******************************************************************************* * * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ******************************************************************************/ #include "device.h" #if DEVICE_SLEEP #include "sleep_api.h" #include "sleepmodes.h" #include "cmsis.h" #include "em_emu.h" #include "critical.h" uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0}; /** * Sleep mode. * Enter the lowest possible sleep mode that is not blocked by ongoing activity. */ void sleep(void) { if (sleep_block_counter[0] > 0) { /* Blocked everything below EM0, so just return */ return; } else if (sleep_block_counter[1] > 0) { /* Blocked everything below EM1, enter EM1 */ EMU_EnterEM1(); } else if (sleep_block_counter[2] > 0) { /* Blocked everything below EM2, enter EM2 */ EMU_EnterEM2(true); } else { /* Blocked everything below EM3, enter EM3 */ EMU_EnterEM3(true); } /* Never enter EM4, as mbed has no way of configuring EM4 wakeup */ return; } /** * Deep Sleep mode. * Enter Energy Mode 2, turning off all high-frequency clocks. * * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER, * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still * available. This gives a high degree of autonomous operation with a current * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out * Detection and full RAM and CPU retention is also included. */ void deepsleep(void) { EMU_EnterEM2(true); } /** Block the microcontroller from sleeping below a certain mode * * This will block sleep() from entering an energy mode below the one given. * -- To be called by peripheral HAL's -- * * After the peripheral is finished with the operation, it should call unblock with the same state * */ void blockSleepMode(sleepstate_enum minimumMode) { core_util_critical_section_enter(); sleep_block_counter[minimumMode]++; core_util_critical_section_exit(); } /** Unblock the microcontroller from sleeping below a certain mode * * This will unblock sleep() from entering an energy mode below the one given. * -- To be called by peripheral HAL's -- * * This should be called after all transactions on a peripheral are done. */ void unblockSleepMode(sleepstate_enum minimumMode) { core_util_critical_section_enter(); if(sleep_block_counter[minimumMode] > 0) { sleep_block_counter[minimumMode]--; } core_util_critical_section_exit(); } #endif