tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC81X/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
  19
  20 //#define DEEPSLEEP
  21 #define POWERDOWN
  22
  23 void sleep(void) {
  24     //Normal sleep mode for PCON:
  25     LPC_PMU->PCON &= ~0x03;
  26
  27     //Normal sleep mode for ARM core:
  28     SCB->SCR = 0;
  29
  30     //And go to sleep
  31     __WFI();
  32 }
  33
  34
  35
  36 //Deepsleep/powerdown modes assume the device is configured to use its internal RC oscillator directly
  37
  38 #ifdef DEEPSLEEP
  39 void deepsleep(void) {
  40     //Deep sleep in PCON
  41     LPC_PMU->PCON &= ~0x03;
  42     LPC_PMU->PCON |= 0x01;
  43
  44     //If brownout detection and WDT are enabled, keep them enabled during sleep
  45     LPC_SYSCON->PDSLEEPCFG = LPC_SYSCON->PDRUNCFG;
  46
  47     //After wakeup same stuff as currently enabled:
  48     LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
  49
  50     //All interrupts may wake up:
  51     LPC_SYSCON->STARTERP0 = 0xFF;
  52     LPC_SYSCON->STARTERP1 = 0xFFFF;
  53
  54     //Deep sleep for ARM core:
  55     SCB->SCR = 1<<2;
  56
  57     __WFI();
  58 }
  59 #endif
  60
  61 #ifdef POWERDOWN
  62 void deepsleep(void) {
  63     //Powerdown in PCON
  64     LPC_PMU->PCON &= ~0x03;
  65     LPC_PMU->PCON |= 0x02;
  66
  67     //If brownout detection and WDT are enabled, keep them enabled during sleep
  68     LPC_SYSCON->PDSLEEPCFG = LPC_SYSCON->PDRUNCFG;
  69
  70     //After wakeup same stuff as currently enabled:
  71     LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
  72
  73     //All interrupts may wake up:
  74     LPC_SYSCON->STARTERP0 = 0xFF;
  75     LPC_SYSCON->STARTERP1 = 0xFFFF;
  76
  77     //Deep sleep for ARM core:
  78     SCB->SCR = 1<<2;
  79
  80     __WFI();
  81 }
  82 #endif