Yihui Xiong / mbed-src

mbed library sources

Dependents:   disable_semihost

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC176X/sleep.c@75:af844aac7b8c, 2014-01-17 (annotated)

Committer:
yihui
Date:
Fri Jan 17 03:18:47 2014 +0000
Revision:
75:af844aac7b8c
Parent:
13:0645d8841f51 
disable semihost and local file system

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 10:3bc89ef62ce7 1 /* mbed Microcontroller Library
emilmont 10:3bc89ef62ce7 2 * Copyright (c) 2006-2013 ARM Limited
emilmont 10:3bc89ef62ce7 3 *
emilmont 10:3bc89ef62ce7 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 10:3bc89ef62ce7 5 * you may not use this file except in compliance with the License.
emilmont 10:3bc89ef62ce7 6 * You may obtain a copy of the License at
emilmont 10:3bc89ef62ce7 7 *
emilmont 10:3bc89ef62ce7 8 * http://www.apache.org/licenses/LICENSE-2.0
emilmont 10:3bc89ef62ce7 9 *
emilmont 10:3bc89ef62ce7 10 * Unless required by applicable law or agreed to in writing, software
emilmont 10:3bc89ef62ce7 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 10:3bc89ef62ce7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 10:3bc89ef62ce7 13 * See the License for the specific language governing permissions and
emilmont 10:3bc89ef62ce7 14 * limitations under the License.
emilmont 10:3bc89ef62ce7 15 */
emilmont 10:3bc89ef62ce7 16 #include "sleep_api.h"
emilmont 10:3bc89ef62ce7 17 #include "cmsis.h"
emilmont 10:3bc89ef62ce7 18 #include "mbed_interface.h"
emilmont 10:3bc89ef62ce7 19
yihui 75:af844aac7b8c 20 #if (DEVICE_SEMIHOST == 0)
yihui 75:af844aac7b8c 21 #define mbed_interface_disconnect()
yihui 75:af844aac7b8c 22 #endif
yihui 75:af844aac7b8c 23
emilmont 10:3bc89ef62ce7 24 void sleep(void) {
emilmont 10:3bc89ef62ce7 25 // ensure debug is disconnected
emilmont 10:3bc89ef62ce7 26 mbed_interface_disconnect();
emilmont 10:3bc89ef62ce7 27
emilmont 10:3bc89ef62ce7 28 // PCON[PD] set to sleep
emilmont 10:3bc89ef62ce7 29 LPC_SC->PCON = 0x0;
emilmont 10:3bc89ef62ce7 30
emilmont 10:3bc89ef62ce7 31 // SRC[SLEEPDEEP] set to 0 = sleep
emilmont 10:3bc89ef62ce7 32 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
emilmont 10:3bc89ef62ce7 33
emilmont 10:3bc89ef62ce7 34 // wait for interrupt
emilmont 10:3bc89ef62ce7 35 __WFI();
emilmont 10:3bc89ef62ce7 36 }
emilmont 10:3bc89ef62ce7 37
emilmont 10:3bc89ef62ce7 38 /*
emilmont 10:3bc89ef62ce7 39 * The mbed lpc1768 does not support the deepsleep mode
emilmont 10:3bc89ef62ce7 40 * as a debugger is connected to it (the mbed interface).
emilmont 10:3bc89ef62ce7 41 *
emilmont 10:3bc89ef62ce7 42 * As mentionned in an application note from NXP:
emilmont 10:3bc89ef62ce7 43 *
emilmont 10:3bc89ef62ce7 44 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
emilmont 10:3bc89ef62ce7 45 *
emilmont 10:3bc89ef62ce7 46 * {{{
emilmont 10:3bc89ef62ce7 47 * The user should be aware of certain limitations during debugging.
emilmont 10:3bc89ef62ce7 48 * The most important is that, due to limitations of the Cortex-M3
emilmont 10:3bc89ef62ce7 49 * integration, the LPC17xx cannot wake up in the usual manner from
emilmont 10:3bc89ef62ce7 50 * Deep Sleep and Power-down modes. It is recommended not to use these
emilmont 10:3bc89ef62ce7 51 * modes during debug. Once an application is downloaded via JTAG/SWD
emilmont 10:3bc89ef62ce7 52 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
emilmont 10:3bc89ef62ce7 53 * should be removed from the target board, and thereafter, power cycle
emilmont 10:3bc89ef62ce7 54 * the LPC17xx to allow wake-up from deep sleep and power-down modes
emilmont 10:3bc89ef62ce7 55 * }}}
emilmont 10:3bc89ef62ce7 56 *
emilmont 10:3bc89ef62ce7 57 * As the interface firmware does not reset the target when a
emilmont 10:3bc89ef62ce7 58 * mbed_interface_disconnect() semihosting call is made, the
emilmont 10:3bc89ef62ce7 59 * core cannot wake-up from deepsleep.
emilmont 10:3bc89ef62ce7 60 *
emilmont 10:3bc89ef62ce7 61 * We treat a deepsleep() as a normal sleep().
emilmont 10:3bc89ef62ce7 62 */
emilmont 10:3bc89ef62ce7 63
emilmont 10:3bc89ef62ce7 64 void deepsleep(void) {
emilmont 10:3bc89ef62ce7 65 // ensure debug is disconnected
emilmont 10:3bc89ef62ce7 66 mbed_interface_disconnect();
emilmont 10:3bc89ef62ce7 67
emilmont 10:3bc89ef62ce7 68 // PCON[PD] set to deepsleep
emilmont 10:3bc89ef62ce7 69 sleep();
emilmont 10:3bc89ef62ce7 70 }