tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11U6X/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 #if DEVICE_SLEEP
  21
  22 void sleep(void) {
  23
  24 #if (DEVICE_SEMIHOST == 1)
  25     // ensure debug is disconnected
  26     mbed_interface_disconnect();
  27 #endif
  28
  29     // PCON[PM] (bits 2:0) set to 0
  30     LPC_PMU->PCON &= ~0x03;
  31
  32     // SRC[SLEEPDEEP] set to 0 = sleep
  33     SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
  34
  35     // wait for interrupt
  36     __WFI();
  37 }
  38
  39
  40 void deepsleep(void) {
  41
  42 #if (DEVICE_SEMIHOST == 1)
  43     // ensure debug is disconnected
  44     mbed_interface_disconnect();
  45 #endif
  46
  47   // PCON[PM] (bits 2:0) set to 1
  48   LPC_PMU->PCON &= ~0x03;
  49   LPC_PMU->PCON |= 0x01;
  50
  51   //According to user manual it is kinda picky about reserved bits, so we follow that nicely
  52   //Keep WDOSC and BOD in same state as they are now during deepsleep
  53   LPC_SYSCON->PDSLEEPCFG = 0x00000037 | (LPC_SYSCON->PDRUNCFG & (0x00000048));
  54
  55   // Power up same as before powerdown
  56   LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG;
  57
  58   // All interrupts can wake
  59   LPC_SYSCON->STARTERP0 = 0xFF;
  60   LPC_SYSCON->STARTERP1 = 0xFFFFFFFF;
  61
  62   // SRC[SLEEPDEEP] set to 1 = deep sleep
  63   SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
  64
  65   // wait for interrupt
  66   __WFI();
  67 }
  68
  69 #endif