tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/sleep.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "sleep_api.h"
  17 #include "cmsis.h"
  18 #include "mbed_interface.h"
  19
  20 void sleep(void) {
  21
  22     // PCON[DPDEN] set to sleep
  23     LPC_PMU->PCON = 0x0;
  24
  25     // SRC[SLEEPDEEP] set to 0 = sleep
  26     SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
  27
  28     // wait for interrupt
  29     __WFI();
  30 }
  31
  32 void deepsleep(void) {
  33
  34     // PCON[DPDEN] set to deepsleep
  35     LPC_PMU->PCON = 0;
  36
  37     // SRC[SLEEPDEEP] set to 1 = deep sleep
  38     SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  39
  40     //According to user manual it is kinda picky about reserved bits, so we follow that nicely
  41     //Keep WDOSC and BOD in same state as they are now during deepsleep
  42     LPC_SYSCON->PDSLEEPCFG = 0x000018B7 | (LPC_SYSCON->PDRUNCFG & (PDRUNCFG_WDTOSC_PD | PDRUNCFG_BOD_PD));
  43
  44     // Power up same as before powerdown
  45     LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
  46
  47     // wait for interrupt
  48     __WFI();
  49 }