sai kiran / mbed-src

Watchdog Timer

Fork of mbed-src by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c@628:4fa1328d9c60, 2015-09-25 (annotated)

Committer:
mbed_official
Date:
Fri Sep 25 14:15:10 2015 +0100
Revision:
628:4fa1328d9c60
Parent:
548:1abac31e188e 
Synchronized with git revision fe238a91ab7a4d1d72c4cab9da04967c619d54ad



Full URL: https://github.com/mbedmicro/mbed/commit/fe238a91ab7a4d1d72c4cab9da04967c619d54ad/



Silicon Labs - Add support for low-power async Serial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 628:4fa1328d9c60 1 /***************************************************************************//**
mbed_official 628:4fa1328d9c60 2 * @file sleep.c
mbed_official 628:4fa1328d9c60 3 *******************************************************************************
mbed_official 628:4fa1328d9c60 4 * @section License
mbed_official 628:4fa1328d9c60 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
mbed_official 628:4fa1328d9c60 6 *******************************************************************************
mbed_official 525:c320967f86b9 7 *
mbed_official 628:4fa1328d9c60 8 * Permission is granted to anyone to use this software for any purpose,
mbed_official 628:4fa1328d9c60 9 * including commercial applications, and to alter it and redistribute it
mbed_official 628:4fa1328d9c60 10 * freely, subject to the following restrictions:
mbed_official 525:c320967f86b9 11 *
mbed_official 628:4fa1328d9c60 12 * 1. The origin of this software must not be misrepresented; you must not
mbed_official 628:4fa1328d9c60 13 * claim that you wrote the original software.
mbed_official 628:4fa1328d9c60 14 * 2. Altered source versions must be plainly marked as such, and must not be
mbed_official 628:4fa1328d9c60 15 * misrepresented as being the original software.
mbed_official 628:4fa1328d9c60 16 * 3. This notice may not be removed or altered from any source distribution.
mbed_official 525:c320967f86b9 17 *
mbed_official 628:4fa1328d9c60 18 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
mbed_official 628:4fa1328d9c60 19 * obligation to support this Software. Silicon Labs is providing the
mbed_official 628:4fa1328d9c60 20 * Software "AS IS", with no express or implied warranties of any kind,
mbed_official 628:4fa1328d9c60 21 * including, but not limited to, any implied warranties of merchantability
mbed_official 628:4fa1328d9c60 22 * or fitness for any particular purpose or warranties against infringement
mbed_official 628:4fa1328d9c60 23 * of any proprietary rights of a third party.
mbed_official 628:4fa1328d9c60 24 *
mbed_official 628:4fa1328d9c60 25 * Silicon Labs will not be liable for any consequential, incidental, or
mbed_official 628:4fa1328d9c60 26 * special damages, or any other relief, or for any claim by any third party,
mbed_official 628:4fa1328d9c60 27 * arising from your use of this Software.
mbed_official 628:4fa1328d9c60 28 *
mbed_official 628:4fa1328d9c60 29 ******************************************************************************/
mbed_official 525:c320967f86b9 30
mbed_official 525:c320967f86b9 31 #include "device.h"
mbed_official 525:c320967f86b9 32 #if DEVICE_SLEEP
mbed_official 525:c320967f86b9 33
mbed_official 525:c320967f86b9 34 #include "sleep_api.h"
mbed_official 526:7c4bdfe6a168 35 #include "sleepmodes.h"
mbed_official 525:c320967f86b9 36 #include "cmsis.h"
mbed_official 525:c320967f86b9 37 #include "em_emu.h"
mbed_official 525:c320967f86b9 38 #include "em_int.h"
mbed_official 525:c320967f86b9 39
mbed_official 525:c320967f86b9 40 uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0};
mbed_official 525:c320967f86b9 41
mbed_official 525:c320967f86b9 42 /**
mbed_official 525:c320967f86b9 43 * Sleep mode.
mbed_official 525:c320967f86b9 44 * Enter Energy Mode 1, which turns off the clock to the CPU.
mbed_official 525:c320967f86b9 45 *
mbed_official 525:c320967f86b9 46 * In EM1, the CPU is sleeping and the power consumption is only 50 μA/MHz.
mbed_official 525:c320967f86b9 47 * All peripherals, including DMA, PRS and memory system, are still available.
mbed_official 525:c320967f86b9 48 */
mbed_official 525:c320967f86b9 49 void sleep(void)
mbed_official 525:c320967f86b9 50 {
mbed_official 548:1abac31e188e 51 if (sleep_block_counter[0] > 0) {
mbed_official 628:4fa1328d9c60 52 /* Blocked everything below EM0, so just return */
mbed_official 548:1abac31e188e 53 return;
mbed_official 548:1abac31e188e 54 } else if (sleep_block_counter[1] > 0) {
mbed_official 628:4fa1328d9c60 55 /* Blocked everything below EM1, enter EM1 */
mbed_official 548:1abac31e188e 56 EMU_EnterEM1();
mbed_official 548:1abac31e188e 57 } else if (sleep_block_counter[2] > 0) {
mbed_official 628:4fa1328d9c60 58 /* Blocked everything below EM2, enter EM2 */
mbed_official 548:1abac31e188e 59 EMU_EnterEM2(true);
mbed_official 548:1abac31e188e 60 } else if (sleep_block_counter[3] > 0) {
mbed_official 628:4fa1328d9c60 61 /* Blocked everything below EM3, enter EM3 */
mbed_official 548:1abac31e188e 62 EMU_EnterEM3(true);
mbed_official 628:4fa1328d9c60 63 } else{
mbed_official 628:4fa1328d9c60 64 /* Nothing is blocked, enter EM4 */
mbed_official 628:4fa1328d9c60 65 EMU_EnterEM4();
mbed_official 548:1abac31e188e 66 }
mbed_official 525:c320967f86b9 67 return;
mbed_official 525:c320967f86b9 68 }
mbed_official 525:c320967f86b9 69
mbed_official 525:c320967f86b9 70 /**
mbed_official 525:c320967f86b9 71 * Deep Sleep mode.
mbed_official 525:c320967f86b9 72 * Enter Energy Mode 2, turning off all high-frequency clocks.
mbed_official 525:c320967f86b9 73 *
mbed_official 525:c320967f86b9 74 * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
mbed_official 525:c320967f86b9 75 * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
mbed_official 525:c320967f86b9 76 * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still
mbed_official 525:c320967f86b9 77 * available. This gives a high degree of autonomous operation with a current
mbed_official 525:c320967f86b9 78 * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out
mbed_official 525:c320967f86b9 79 * Detection and full RAM and CPU retention is also included.
mbed_official 525:c320967f86b9 80 */
mbed_official 525:c320967f86b9 81 void deepsleep(void)
mbed_official 525:c320967f86b9 82 {
mbed_official 525:c320967f86b9 83 EMU_EnterEM2(true);
mbed_official 525:c320967f86b9 84 }
mbed_official 525:c320967f86b9 85
mbed_official 525:c320967f86b9 86 /** Block the microcontroller from sleeping below a certain mode
mbed_official 525:c320967f86b9 87 *
mbed_official 525:c320967f86b9 88 * This will block sleep() from entering an energy mode below the one given.
mbed_official 525:c320967f86b9 89 * -- To be called by peripheral HAL's --
mbed_official 525:c320967f86b9 90 *
mbed_official 525:c320967f86b9 91 * After the peripheral is finished with the operation, it should call unblock with the same state
mbed_official 525:c320967f86b9 92 *
mbed_official 525:c320967f86b9 93 */
mbed_official 548:1abac31e188e 94 void blockSleepMode(sleepstate_enum minimumMode)
mbed_official 525:c320967f86b9 95 {
mbed_official 548:1abac31e188e 96 INT_Disable();
mbed_official 548:1abac31e188e 97 sleep_block_counter[minimumMode]++;
mbed_official 548:1abac31e188e 98 INT_Enable();
mbed_official 525:c320967f86b9 99 }
mbed_official 525:c320967f86b9 100
mbed_official 525:c320967f86b9 101 /** Unblock the microcontroller from sleeping below a certain mode
mbed_official 525:c320967f86b9 102 *
mbed_official 525:c320967f86b9 103 * This will unblock sleep() from entering an energy mode below the one given.
mbed_official 525:c320967f86b9 104 * -- To be called by peripheral HAL's --
mbed_official 525:c320967f86b9 105 *
mbed_official 525:c320967f86b9 106 * This should be called after all transactions on a peripheral are done.
mbed_official 525:c320967f86b9 107 */
mbed_official 548:1abac31e188e 108 void unblockSleepMode(sleepstate_enum minimumMode)
mbed_official 525:c320967f86b9 109 {
mbed_official 548:1abac31e188e 110 INT_Disable();
mbed_official 548:1abac31e188e 111 if(sleep_block_counter[minimumMode] > 0) {
mbed_official 548:1abac31e188e 112 sleep_block_counter[minimumMode]--;
mbed_official 548:1abac31e188e 113 }
mbed_official 548:1abac31e188e 114 INT_Enable();
mbed_official 525:c320967f86b9 115 }
mbed_official 525:c320967f86b9 116
mbed_official 525:c320967f86b9 117 #endif