Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/hal/TARGET_NXP/TARGET_LPC176X/sleep.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
Parent:
0:9b334a45a8ff 
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "sleep_api.h"
<> 144:ef7eb2e8f9f7 17 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 18 #include "mbed_interface.h"
<> 144:ef7eb2e8f9f7 19
<> 144:ef7eb2e8f9f7 20 void sleep(void) {
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #if (DEVICE_SEMIHOST == 1)
<> 144:ef7eb2e8f9f7 23 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 24 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 25 #endif
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 // PCON[PD] set to sleep
<> 144:ef7eb2e8f9f7 28 LPC_SC->PCON = 0x0;
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 // SRC[SLEEPDEEP] set to 0 = sleep
<> 144:ef7eb2e8f9f7 31 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 // wait for interrupt
<> 144:ef7eb2e8f9f7 34 __WFI();
<> 144:ef7eb2e8f9f7 35 }
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 /*
<> 144:ef7eb2e8f9f7 38 * The mbed lpc1768 does not support the deepsleep mode
<> 144:ef7eb2e8f9f7 39 * as a debugger is connected to it (the mbed interface).
<> 144:ef7eb2e8f9f7 40 *
<> 144:ef7eb2e8f9f7 41 * As mentionned in an application note from NXP:
<> 144:ef7eb2e8f9f7 42 *
<> 144:ef7eb2e8f9f7 43 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
<> 144:ef7eb2e8f9f7 44 *
<> 144:ef7eb2e8f9f7 45 * {{{
<> 144:ef7eb2e8f9f7 46 * The user should be aware of certain limitations during debugging.
<> 144:ef7eb2e8f9f7 47 * The most important is that, due to limitations of the Cortex-M3
<> 144:ef7eb2e8f9f7 48 * integration, the LPC17xx cannot wake up in the usual manner from
<> 144:ef7eb2e8f9f7 49 * Deep Sleep and Power-down modes. It is recommended not to use these
<> 144:ef7eb2e8f9f7 50 * modes during debug. Once an application is downloaded via JTAG/SWD
<> 144:ef7eb2e8f9f7 51 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
<> 144:ef7eb2e8f9f7 52 * should be removed from the target board, and thereafter, power cycle
<> 144:ef7eb2e8f9f7 53 * the LPC17xx to allow wake-up from deep sleep and power-down modes
<> 144:ef7eb2e8f9f7 54 * }}}
<> 144:ef7eb2e8f9f7 55 *
<> 144:ef7eb2e8f9f7 56 * As the interface firmware does not reset the target when a
<> 144:ef7eb2e8f9f7 57 * mbed_interface_disconnect() semihosting call is made, the
<> 144:ef7eb2e8f9f7 58 * core cannot wake-up from deepsleep.
<> 144:ef7eb2e8f9f7 59 *
<> 144:ef7eb2e8f9f7 60 * We treat a deepsleep() as a normal sleep().
<> 144:ef7eb2e8f9f7 61 */
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 void deepsleep(void) {
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 #if (DEVICE_SEMIHOST == 1)
<> 144:ef7eb2e8f9f7 66 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 67 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 68 #endif
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 // PCON[PD] set to deepsleep
<> 144:ef7eb2e8f9f7 71 sleep();
<> 144:ef7eb2e8f9f7 72 }