Fawwaz Nadzmy / mbed-STM

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
22:9c52de9bc1d7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 2 * @file sleep.c
bogdanm 0:9b334a45a8ff 3 *******************************************************************************
bogdanm 0:9b334a45a8ff 4 * @section License
bogdanm 0:9b334a45a8ff 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
bogdanm 0:9b334a45a8ff 6 *******************************************************************************
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * Permission is granted to anyone to use this software for any purpose,
bogdanm 0:9b334a45a8ff 9 * including commercial applications, and to alter it and redistribute it
bogdanm 0:9b334a45a8ff 10 * freely, subject to the following restrictions:
bogdanm 0:9b334a45a8ff 11 *
bogdanm 0:9b334a45a8ff 12 * 1. The origin of this software must not be misrepresented; you must not
bogdanm 0:9b334a45a8ff 13 * claim that you wrote the original software.
bogdanm 0:9b334a45a8ff 14 * 2. Altered source versions must be plainly marked as such, and must not be
bogdanm 0:9b334a45a8ff 15 * misrepresented as being the original software.
bogdanm 0:9b334a45a8ff 16 * 3. This notice may not be removed or altered from any source distribution.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
bogdanm 0:9b334a45a8ff 19 * obligation to support this Software. Silicon Labs is providing the
bogdanm 0:9b334a45a8ff 20 * Software "AS IS", with no express or implied warranties of any kind,
bogdanm 0:9b334a45a8ff 21 * including, but not limited to, any implied warranties of merchantability
bogdanm 0:9b334a45a8ff 22 * or fitness for any particular purpose or warranties against infringement
bogdanm 0:9b334a45a8ff 23 * of any proprietary rights of a third party.
bogdanm 0:9b334a45a8ff 24 *
bogdanm 0:9b334a45a8ff 25 * Silicon Labs will not be liable for any consequential, incidental, or
bogdanm 0:9b334a45a8ff 26 * special damages, or any other relief, or for any claim by any third party,
bogdanm 0:9b334a45a8ff 27 * arising from your use of this Software.
bogdanm 0:9b334a45a8ff 28 *
bogdanm 0:9b334a45a8ff 29 ******************************************************************************/
bogdanm 0:9b334a45a8ff 30
bogdanm 0:9b334a45a8ff 31 #include "device.h"
bogdanm 0:9b334a45a8ff 32 #if DEVICE_SLEEP
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #include "sleep_api.h"
bogdanm 0:9b334a45a8ff 35 #include "sleepmodes.h"
bogdanm 0:9b334a45a8ff 36 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 37 #include "em_emu.h"
bogdanm 0:9b334a45a8ff 38 #include "em_int.h"
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0};
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 /**
bogdanm 0:9b334a45a8ff 43 * Sleep mode.
bogdanm 0:9b334a45a8ff 44 * Enter Energy Mode 1, which turns off the clock to the CPU.
bogdanm 0:9b334a45a8ff 45 *
bogdanm 0:9b334a45a8ff 46 * In EM1, the CPU is sleeping and the power consumption is only 50 μA/MHz.
bogdanm 0:9b334a45a8ff 47 * All peripherals, including DMA, PRS and memory system, are still available.
bogdanm 0:9b334a45a8ff 48 */
bogdanm 0:9b334a45a8ff 49 void sleep(void)
bogdanm 0:9b334a45a8ff 50 {
bogdanm 0:9b334a45a8ff 51 if (sleep_block_counter[0] > 0) {
bogdanm 0:9b334a45a8ff 52 /* Blocked everything below EM0, so just return */
bogdanm 0:9b334a45a8ff 53 return;
bogdanm 0:9b334a45a8ff 54 } else if (sleep_block_counter[1] > 0) {
bogdanm 0:9b334a45a8ff 55 /* Blocked everything below EM1, enter EM1 */
bogdanm 0:9b334a45a8ff 56 EMU_EnterEM1();
bogdanm 0:9b334a45a8ff 57 } else if (sleep_block_counter[2] > 0) {
bogdanm 0:9b334a45a8ff 58 /* Blocked everything below EM2, enter EM2 */
bogdanm 0:9b334a45a8ff 59 EMU_EnterEM2(true);
bogdanm 0:9b334a45a8ff 60 } else if (sleep_block_counter[3] > 0) {
bogdanm 0:9b334a45a8ff 61 /* Blocked everything below EM3, enter EM3 */
bogdanm 0:9b334a45a8ff 62 EMU_EnterEM3(true);
bogdanm 0:9b334a45a8ff 63 } else{
bogdanm 0:9b334a45a8ff 64 /* Nothing is blocked, enter EM4 */
bogdanm 0:9b334a45a8ff 65 EMU_EnterEM4();
bogdanm 0:9b334a45a8ff 66 }
bogdanm 0:9b334a45a8ff 67 return;
bogdanm 0:9b334a45a8ff 68 }
bogdanm 0:9b334a45a8ff 69
bogdanm 0:9b334a45a8ff 70 /**
bogdanm 0:9b334a45a8ff 71 * Deep Sleep mode.
bogdanm 0:9b334a45a8ff 72 * Enter Energy Mode 2, turning off all high-frequency clocks.
bogdanm 0:9b334a45a8ff 73 *
bogdanm 0:9b334a45a8ff 74 * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
bogdanm 0:9b334a45a8ff 75 * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
bogdanm 0:9b334a45a8ff 76 * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still
bogdanm 0:9b334a45a8ff 77 * available. This gives a high degree of autonomous operation with a current
bogdanm 0:9b334a45a8ff 78 * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out
bogdanm 0:9b334a45a8ff 79 * Detection and full RAM and CPU retention is also included.
bogdanm 0:9b334a45a8ff 80 */
bogdanm 0:9b334a45a8ff 81 void deepsleep(void)
bogdanm 0:9b334a45a8ff 82 {
bogdanm 0:9b334a45a8ff 83 EMU_EnterEM2(true);
bogdanm 0:9b334a45a8ff 84 }
bogdanm 0:9b334a45a8ff 85
bogdanm 0:9b334a45a8ff 86 /** Block the microcontroller from sleeping below a certain mode
bogdanm 0:9b334a45a8ff 87 *
bogdanm 0:9b334a45a8ff 88 * This will block sleep() from entering an energy mode below the one given.
bogdanm 0:9b334a45a8ff 89 * -- To be called by peripheral HAL's --
bogdanm 0:9b334a45a8ff 90 *
bogdanm 0:9b334a45a8ff 91 * After the peripheral is finished with the operation, it should call unblock with the same state
bogdanm 0:9b334a45a8ff 92 *
bogdanm 0:9b334a45a8ff 93 */
bogdanm 0:9b334a45a8ff 94 void blockSleepMode(sleepstate_enum minimumMode)
bogdanm 0:9b334a45a8ff 95 {
bogdanm 0:9b334a45a8ff 96 INT_Disable();
bogdanm 0:9b334a45a8ff 97 sleep_block_counter[minimumMode]++;
bogdanm 0:9b334a45a8ff 98 INT_Enable();
bogdanm 0:9b334a45a8ff 99 }
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 /** Unblock the microcontroller from sleeping below a certain mode
bogdanm 0:9b334a45a8ff 102 *
bogdanm 0:9b334a45a8ff 103 * This will unblock sleep() from entering an energy mode below the one given.
bogdanm 0:9b334a45a8ff 104 * -- To be called by peripheral HAL's --
bogdanm 0:9b334a45a8ff 105 *
bogdanm 0:9b334a45a8ff 106 * This should be called after all transactions on a peripheral are done.
bogdanm 0:9b334a45a8ff 107 */
bogdanm 0:9b334a45a8ff 108 void unblockSleepMode(sleepstate_enum minimumMode)
bogdanm 0:9b334a45a8ff 109 {
bogdanm 0:9b334a45a8ff 110 INT_Disable();
bogdanm 0:9b334a45a8ff 111 if(sleep_block_counter[minimumMode] > 0) {
bogdanm 0:9b334a45a8ff 112 sleep_block_counter[minimumMode]--;
bogdanm 0:9b334a45a8ff 113 }
bogdanm 0:9b334a45a8ff 114 INT_Enable();
bogdanm 0:9b334a45a8ff 115 }
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 #endif