lzbp li / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_Freescale/TARGET_K20XX/sleep.c@445:3312ed629f01, 2015-01-15 (annotated)

Committer:
mbed_official
Date:
Thu Jan 15 19:30:07 2015 +0000
Revision:
445:3312ed629f01
Child:
489:119543c9f674
Synchronized with git revision e21c65041d9a718f866ed6438e5791b13f9c6d91



Full URL: https://github.com/mbedmicro/mbed/commit/e21c65041d9a718f866ed6438e5791b13f9c6d91/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 445:3312ed629f01 1 /* mbed Microcontroller Library
mbed_official 445:3312ed629f01 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 445:3312ed629f01 3 *
mbed_official 445:3312ed629f01 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 445:3312ed629f01 5 * you may not use this file except in compliance with the License.
mbed_official 445:3312ed629f01 6 * You may obtain a copy of the License at
mbed_official 445:3312ed629f01 7 *
mbed_official 445:3312ed629f01 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 445:3312ed629f01 9 *
mbed_official 445:3312ed629f01 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 445:3312ed629f01 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 445:3312ed629f01 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 445:3312ed629f01 13 * See the License for the specific language governing permissions and
mbed_official 445:3312ed629f01 14 * limitations under the License.
mbed_official 445:3312ed629f01 15 */
mbed_official 445:3312ed629f01 16 #include "sleep_api.h"
mbed_official 445:3312ed629f01 17 #include "cmsis.h"
mbed_official 445:3312ed629f01 18
mbed_official 445:3312ed629f01 19 //Normal wait mode
mbed_official 445:3312ed629f01 20 void sleep(void)
mbed_official 445:3312ed629f01 21 {
mbed_official 445:3312ed629f01 22 SMC->PMPROT = SMC_PMPROT_AVLLS_MASK | SMC_PMPROT_ALLS_MASK | SMC_PMPROT_AVLP_MASK;
mbed_official 445:3312ed629f01 23
mbed_official 445:3312ed629f01 24 //Normal sleep mode for ARM core:
mbed_official 445:3312ed629f01 25 SCB->SCR = 0;
mbed_official 445:3312ed629f01 26 __WFI();
mbed_official 445:3312ed629f01 27 }
mbed_official 445:3312ed629f01 28
mbed_official 445:3312ed629f01 29 //Very low-power stop mode
mbed_official 445:3312ed629f01 30 void deepsleep(void)
mbed_official 445:3312ed629f01 31 {
mbed_official 445:3312ed629f01 32 //Check if PLL/FLL is enabled:
mbed_official 445:3312ed629f01 33 uint32_t PLL_FLL_en = (MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(0);
mbed_official 445:3312ed629f01 34
mbed_official 445:3312ed629f01 35 SMC->PMPROT = SMC_PMPROT_AVLLS_MASK | SMC_PMPROT_ALLS_MASK | SMC_PMPROT_AVLP_MASK;
mbed_official 445:3312ed629f01 36 SMC->PMCTRL = SMC_PMCTRL_STOPM(2);
mbed_official 445:3312ed629f01 37
mbed_official 445:3312ed629f01 38 //Deep sleep for ARM core:
mbed_official 445:3312ed629f01 39 SCB->SCR = 1<<SCB_SCR_SLEEPDEEP_Pos;
mbed_official 445:3312ed629f01 40
mbed_official 445:3312ed629f01 41 __WFI();
mbed_official 445:3312ed629f01 42
mbed_official 445:3312ed629f01 43 //Switch back to PLL as clock source if needed
mbed_official 445:3312ed629f01 44 //The interrupt that woke up the device will run at reduced speed
mbed_official 445:3312ed629f01 45 if (PLL_FLL_en) {
mbed_official 445:3312ed629f01 46 if (MCG->C6 & (1<<MCG_C6_PLLS_SHIFT) != 0) /* If PLL */
mbed_official 445:3312ed629f01 47 while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U); /* Wait until locked */
mbed_official 445:3312ed629f01 48 MCG->C1 &= ~MCG_C1_CLKS_MASK;
mbed_official 445:3312ed629f01 49 }
mbed_official 445:3312ed629f01 50
mbed_official 445:3312ed629f01 51 }