Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/hal/TARGET_NXP/TARGET_LPC11UXX/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 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 22 #if DEVICE_SEMIHOST
<> 144:ef7eb2e8f9f7 23 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 24 #endif
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 // PCON[PD] set to sleep
<> 144:ef7eb2e8f9f7 27 LPC_PMU->PCON = 0x0;
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 // SRC[SLEEPDEEP] set to 0 = sleep
<> 144:ef7eb2e8f9f7 30 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 // wait for interrupt
<> 144:ef7eb2e8f9f7 33 __WFI();
<> 144:ef7eb2e8f9f7 34 }
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 /*
<> 144:ef7eb2e8f9f7 37 * The mbed lpc1768 does not support the deepsleep mode
<> 144:ef7eb2e8f9f7 38 * as a debugger is connected to it (the mbed interface).
<> 144:ef7eb2e8f9f7 39 *
<> 144:ef7eb2e8f9f7 40 * As mentionned in an application note from NXP:
<> 144:ef7eb2e8f9f7 41 *
<> 144:ef7eb2e8f9f7 42 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
<> 144:ef7eb2e8f9f7 43 *
<> 144:ef7eb2e8f9f7 44 * {{{
<> 144:ef7eb2e8f9f7 45 * The user should be aware of certain limitations during debugging.
<> 144:ef7eb2e8f9f7 46 * The most important is that, due to limitations of the Cortex-M3
<> 144:ef7eb2e8f9f7 47 * integration, the LPC17xx cannot wake up in the usual manner from
<> 144:ef7eb2e8f9f7 48 * Deep Sleep and Power-down modes. It is recommended not to use these
<> 144:ef7eb2e8f9f7 49 * modes during debug. Once an application is downloaded via JTAG/SWD
<> 144:ef7eb2e8f9f7 50 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
<> 144:ef7eb2e8f9f7 51 * should be removed from the target board, and thereafter, power cycle
<> 144:ef7eb2e8f9f7 52 * the LPC17xx to allow wake-up from deep sleep and power-down modes
<> 144:ef7eb2e8f9f7 53 * }}}
<> 144:ef7eb2e8f9f7 54 *
<> 144:ef7eb2e8f9f7 55 * As the interface firmware does not reset the target when a
<> 144:ef7eb2e8f9f7 56 * mbed_interface_disconnect() semihosting call is made, the
<> 144:ef7eb2e8f9f7 57 * core cannot wake-up from deepsleep.
<> 144:ef7eb2e8f9f7 58 *
<> 144:ef7eb2e8f9f7 59 * We treat a deepsleep() as a normal sleep().
<> 144:ef7eb2e8f9f7 60 */
<> 144:ef7eb2e8f9f7 61
<> 144:ef7eb2e8f9f7 62 void deepsleep(void) {
<> 144:ef7eb2e8f9f7 63 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 64 #if DEVICE_SEMIHOST
<> 144:ef7eb2e8f9f7 65 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 66 #endif
<> 144:ef7eb2e8f9f7 67
<> 144:ef7eb2e8f9f7 68 // PCON[PD] set to deepsleep
<> 144:ef7eb2e8f9f7 69 LPC_PMU->PCON = 0x1;
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 // SRC[SLEEPDEEP] set to 1 = deep sleep
<> 144:ef7eb2e8f9f7 72 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 // Power up everything after powerdown
<> 144:ef7eb2e8f9f7 75 LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 // wait for interrupt
<> 144:ef7eb2e8f9f7 78 __WFI();
<> 144:ef7eb2e8f9f7 79 }