mbed library sources. Supersedes mbed-src.
Fork of mbed-dev by
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c
- Committer:
- mbed_official
- Date:
- 2015-11-17
- Revision:
- 22:9c52de9bc1d7
- Parent:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
File content as of revision 22:9c52de9bc1d7:
/***************************************************************************//** * @file sleep.c ******************************************************************************* * @section License * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> ******************************************************************************* * * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * * 1. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. * 2. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * 3. This notice may not be removed or altered from any source distribution. * * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no * obligation to support this Software. Silicon Labs is providing the * Software "AS IS", with no express or implied warranties of any kind, * including, but not limited to, any implied warranties of merchantability * or fitness for any particular purpose or warranties against infringement * of any proprietary rights of a third party. * * Silicon Labs will not be liable for any consequential, incidental, or * special damages, or any other relief, or for any claim by any third party, * arising from your use of this Software. * ******************************************************************************/ #include "device.h" #if DEVICE_SLEEP #include "sleep_api.h" #include "sleepmodes.h" #include "cmsis.h" #include "em_emu.h" #include "em_int.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) { INT_Disable(); sleep_block_counter[minimumMode]++; INT_Enable(); } /** 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) { INT_Disable(); if(sleep_block_counter[minimumMode] > 0) { sleep_block_counter[minimumMode]--; } INT_Enable(); } #endif