mbed library sources
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targets/hal/TARGET_NXP/TARGET_LPC11UXX/sleep.c
- Committer:
- mbed_official
- Date:
- 2015-09-30
- Revision:
- 636:a11c0372f0ba
- Parent:
- 75:99bf659e4489
File content as of revision 636:a11c0372f0ba:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "sleep_api.h" #include "cmsis.h" #include "mbed_interface.h" void sleep(void) { // ensure debug is disconnected #if DEVICE_SEMIHOST mbed_interface_disconnect(); #endif // PCON[PD] set to sleep LPC_PMU->PCON = 0x0; // SRC[SLEEPDEEP] set to 0 = sleep SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk; // wait for interrupt __WFI(); } /* * The mbed lpc1768 does not support the deepsleep mode * as a debugger is connected to it (the mbed interface). * * As mentionned in an application note from NXP: * * http://www.po-star.com/public/uploads/20120319123122_141.pdf * * {{{ * The user should be aware of certain limitations during debugging. * The most important is that, due to limitations of the Cortex-M3 * integration, the LPC17xx cannot wake up in the usual manner from * Deep Sleep and Power-down modes. It is recommended not to use these * modes during debug. Once an application is downloaded via JTAG/SWD * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example) * should be removed from the target board, and thereafter, power cycle * the LPC17xx to allow wake-up from deep sleep and power-down modes * }}} * * As the interface firmware does not reset the target when a * mbed_interface_disconnect() semihosting call is made, the * core cannot wake-up from deepsleep. * * We treat a deepsleep() as a normal sleep(). */ void deepsleep(void) { // ensure debug is disconnected #if DEVICE_SEMIHOST mbed_interface_disconnect(); #endif // PCON[PD] set to deepsleep LPC_PMU->PCON = 0x1; // SRC[SLEEPDEEP] set to 1 = deep sleep SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; // Power up everything after powerdown LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800; // wait for interrupt __WFI(); }