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mbed SDK library sources

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Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11XX/sleep.c@19:398f4c622e1b, 2013-08-19 (annotated)

Committer:
bogdanm
Date:
Mon Aug 19 18:17:02 2013 +0300
Revision:
19:398f4c622e1b
Sync with official mbed library release 66

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 19:398f4c622e1b 1 /* mbed Microcontroller Library
bogdanm 19:398f4c622e1b 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 19:398f4c622e1b 3 *
bogdanm 19:398f4c622e1b 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 19:398f4c622e1b 5 * you may not use this file except in compliance with the License.
bogdanm 19:398f4c622e1b 6 * You may obtain a copy of the License at
bogdanm 19:398f4c622e1b 7 *
bogdanm 19:398f4c622e1b 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 19:398f4c622e1b 9 *
bogdanm 19:398f4c622e1b 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 19:398f4c622e1b 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 19:398f4c622e1b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 19:398f4c622e1b 13 * See the License for the specific language governing permissions and
bogdanm 19:398f4c622e1b 14 * limitations under the License.
bogdanm 19:398f4c622e1b 15 */
bogdanm 19:398f4c622e1b 16 #include "sleep_api.h"
bogdanm 19:398f4c622e1b 17 #include "cmsis.h"
bogdanm 19:398f4c622e1b 18 #include "mbed_interface.h"
bogdanm 19:398f4c622e1b 19
bogdanm 19:398f4c622e1b 20 void sleep(void) {
bogdanm 19:398f4c622e1b 21 // ensure debug is disconnected
bogdanm 19:398f4c622e1b 22 mbed_interface_disconnect();
bogdanm 19:398f4c622e1b 23
bogdanm 19:398f4c622e1b 24 // PCON[DPDEN] set to sleep
bogdanm 19:398f4c622e1b 25 LPC_PMU->PCON = 0x0;
bogdanm 19:398f4c622e1b 26
bogdanm 19:398f4c622e1b 27 // SRC[SLEEPDEEP] set to 0 = sleep
bogdanm 19:398f4c622e1b 28 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
bogdanm 19:398f4c622e1b 29
bogdanm 19:398f4c622e1b 30 // wait for interrupt
bogdanm 19:398f4c622e1b 31 __WFI();
bogdanm 19:398f4c622e1b 32 }
bogdanm 19:398f4c622e1b 33
bogdanm 19:398f4c622e1b 34 /*
bogdanm 19:398f4c622e1b 35 * The mbed lpc1768 does not support the deepsleep mode
bogdanm 19:398f4c622e1b 36 * as a debugger is connected to it (the mbed interface).
bogdanm 19:398f4c622e1b 37 *
bogdanm 19:398f4c622e1b 38 * As mentionned in an application note from NXP:
bogdanm 19:398f4c622e1b 39 *
bogdanm 19:398f4c622e1b 40 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
bogdanm 19:398f4c622e1b 41 *
bogdanm 19:398f4c622e1b 42 * {{{
bogdanm 19:398f4c622e1b 43 * The user should be aware of certain limitations during debugging.
bogdanm 19:398f4c622e1b 44 * The most important is that, due to limitations of the Cortex-M3
bogdanm 19:398f4c622e1b 45 * integration, the LPC17xx cannot wake up in the usual manner from
bogdanm 19:398f4c622e1b 46 * Deep Sleep and Power-down modes. It is recommended not to use these
bogdanm 19:398f4c622e1b 47 * modes during debug. Once an application is downloaded via JTAG/SWD
bogdanm 19:398f4c622e1b 48 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
bogdanm 19:398f4c622e1b 49 * should be removed from the target board, and thereafter, power cycle
bogdanm 19:398f4c622e1b 50 * the LPC17xx to allow wake-up from deep sleep and power-down modes
bogdanm 19:398f4c622e1b 51 * }}}
bogdanm 19:398f4c622e1b 52 *
bogdanm 19:398f4c622e1b 53 * As the interface firmware does not reset the target when a
bogdanm 19:398f4c622e1b 54 * mbed_interface_disconnect() semihosting call is made, the
bogdanm 19:398f4c622e1b 55 * core cannot wake-up from deepsleep.
bogdanm 19:398f4c622e1b 56 *
bogdanm 19:398f4c622e1b 57 * We treat a deepsleep() as a normal sleep().
bogdanm 19:398f4c622e1b 58 */
bogdanm 19:398f4c622e1b 59
bogdanm 19:398f4c622e1b 60 void deepsleep(void) {
bogdanm 19:398f4c622e1b 61 // ensure debug is disconnected
bogdanm 19:398f4c622e1b 62 mbed_interface_disconnect();
bogdanm 19:398f4c622e1b 63
bogdanm 19:398f4c622e1b 64 // PCON[DPDEN] set to deepsleep
bogdanm 19:398f4c622e1b 65 LPC_PMU->PCON = 0x2;
bogdanm 19:398f4c622e1b 66
bogdanm 19:398f4c622e1b 67 // SRC[SLEEPDEEP] set to 1 = deep sleep
bogdanm 19:398f4c622e1b 68 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
bogdanm 19:398f4c622e1b 69
bogdanm 19:398f4c622e1b 70 // Power up everything after powerdown
bogdanm 19:398f4c622e1b 71 LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;
bogdanm 19:398f4c622e1b 72
bogdanm 19:398f4c622e1b 73 // wait for interrupt
bogdanm 19:398f4c622e1b 74 __WFI();
bogdanm 19:398f4c622e1b 75 }