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Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_NXP/TARGET_LPC176X/sleep.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 * Copyright (c) 2006-2013 ARM Limited
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Licensed under the Apache License, Version 2.0 (the "License");
group-onsemi 0:098463de4c5d 5 * you may not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 6 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 7 *
group-onsemi 0:098463de4c5d 8 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 9 *
group-onsemi 0:098463de4c5d 10 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 11 * distributed under the License is distributed on an "AS IS" BASIS,
group-onsemi 0:098463de4c5d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 13 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 14 * limitations under the License.
group-onsemi 0:098463de4c5d 15 */
group-onsemi 0:098463de4c5d 16 #include "sleep_api.h"
group-onsemi 0:098463de4c5d 17 #include "cmsis.h"
group-onsemi 0:098463de4c5d 18 #include "mbed_interface.h"
group-onsemi 0:098463de4c5d 19
group-onsemi 0:098463de4c5d 20 void sleep(void) {
group-onsemi 0:098463de4c5d 21
group-onsemi 0:098463de4c5d 22 #if (DEVICE_SEMIHOST == 1)
group-onsemi 0:098463de4c5d 23 // ensure debug is disconnected
group-onsemi 0:098463de4c5d 24 mbed_interface_disconnect();
group-onsemi 0:098463de4c5d 25 #endif
group-onsemi 0:098463de4c5d 26
group-onsemi 0:098463de4c5d 27 // PCON[PD] set to sleep
group-onsemi 0:098463de4c5d 28 LPC_SC->PCON = 0x0;
group-onsemi 0:098463de4c5d 29
group-onsemi 0:098463de4c5d 30 // SRC[SLEEPDEEP] set to 0 = sleep
group-onsemi 0:098463de4c5d 31 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
group-onsemi 0:098463de4c5d 32
group-onsemi 0:098463de4c5d 33 // wait for interrupt
group-onsemi 0:098463de4c5d 34 __WFI();
group-onsemi 0:098463de4c5d 35 }
group-onsemi 0:098463de4c5d 36
group-onsemi 0:098463de4c5d 37 /*
group-onsemi 0:098463de4c5d 38 * The mbed lpc1768 does not support the deepsleep mode
group-onsemi 0:098463de4c5d 39 * as a debugger is connected to it (the mbed interface).
group-onsemi 0:098463de4c5d 40 *
group-onsemi 0:098463de4c5d 41 * As mentionned in an application note from NXP:
group-onsemi 0:098463de4c5d 42 *
group-onsemi 0:098463de4c5d 43 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
group-onsemi 0:098463de4c5d 44 *
group-onsemi 0:098463de4c5d 45 * {{{
group-onsemi 0:098463de4c5d 46 * The user should be aware of certain limitations during debugging.
group-onsemi 0:098463de4c5d 47 * The most important is that, due to limitations of the Cortex-M3
group-onsemi 0:098463de4c5d 48 * integration, the LPC17xx cannot wake up in the usual manner from
group-onsemi 0:098463de4c5d 49 * Deep Sleep and Power-down modes. It is recommended not to use these
group-onsemi 0:098463de4c5d 50 * modes during debug. Once an application is downloaded via JTAG/SWD
group-onsemi 0:098463de4c5d 51 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
group-onsemi 0:098463de4c5d 52 * should be removed from the target board, and thereafter, power cycle
group-onsemi 0:098463de4c5d 53 * the LPC17xx to allow wake-up from deep sleep and power-down modes
group-onsemi 0:098463de4c5d 54 * }}}
group-onsemi 0:098463de4c5d 55 *
group-onsemi 0:098463de4c5d 56 * As the interface firmware does not reset the target when a
group-onsemi 0:098463de4c5d 57 * mbed_interface_disconnect() semihosting call is made, the
group-onsemi 0:098463de4c5d 58 * core cannot wake-up from deepsleep.
group-onsemi 0:098463de4c5d 59 *
group-onsemi 0:098463de4c5d 60 * We treat a deepsleep() as a normal sleep().
group-onsemi 0:098463de4c5d 61 */
group-onsemi 0:098463de4c5d 62
group-onsemi 0:098463de4c5d 63 void deepsleep(void) {
group-onsemi 0:098463de4c5d 64
group-onsemi 0:098463de4c5d 65 #if (DEVICE_SEMIHOST == 1)
group-onsemi 0:098463de4c5d 66 // ensure debug is disconnected
group-onsemi 0:098463de4c5d 67 mbed_interface_disconnect();
group-onsemi 0:098463de4c5d 68 #endif
group-onsemi 0:098463de4c5d 69
group-onsemi 0:098463de4c5d 70 // PCON[PD] set to deepsleep
group-onsemi 0:098463de4c5d 71 sleep();
group-onsemi 0:098463de4c5d 72 }