tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC82X/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 {
  25     //Normal sleep mode for PCON:
  26     LPC_PMU->PCON &= ~0x03;
  27
  28     //Normal sleep mode for ARM core:
  29     SCB->SCR = 0;
  30
  31     //And go to sleep
  32     __WFI();
  33 }
  34
  35 // Deepsleep/powerdown modes assume the device is configured to use its internal RC oscillator directly
  36
  37 void deepsleep(void)
  38 {
  39     //Deep sleep in PCON
  40     LPC_PMU->PCON &= ~0x03;
  41
  42 #if defined(DEEPSLEEP)
  43     LPC_PMU->PCON |= 0x01;
  44 #elif defined(POWERDOWN)
  45     LPC_PMU->PCON |= 0x02;
  46 #endif
  47
  48     //If brownout detection and WDT are enabled, keep them enabled during sleep
  49     LPC_SYSCON->PDSLEEPCFG = LPC_SYSCON->PDRUNCFG;
  50
  51     //After wakeup same stuff as currently enabled:
  52     LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
  53
  54     //All interrupts may wake up:
  55     LPC_SYSCON->STARTERP0 = 0xFF;
  56     LPC_SYSCON->STARTERP1 = 0xFFFF;
  57
  58     //Deep sleep for ARM core:
  59     SCB->SCR = 1<<2;
  60
  61     __WFI();
  62 }