mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_NXP/TARGET_LPC176X/sleep.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
186:707f6e361f3e 
mbed library release version 165

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
Anna Bridge 186:707f6e361f3e 20 /*
Anna Bridge 186:707f6e361f3e 21 * @note
Anna Bridge 186:707f6e361f3e 22 * The mbed interface semihosting is disconnected as part of going to sleep, and can not be restored.
Anna Bridge 186:707f6e361f3e 23 * Flash re-programming and the USB serial port will remain active, but the mbed program will no longer be
Anna Bridge 186:707f6e361f3e 24 * able to access the LocalFileSystem
Anna Bridge 186:707f6e361f3e 25 */
Anna Bridge 186:707f6e361f3e 26
<> 160:d5399cc887bb 27 void hal_sleep(void) {
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 #if (DEVICE_SEMIHOST == 1)
<> 144:ef7eb2e8f9f7 30 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 31 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 32 #endif
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 // PCON[PD] set to sleep
<> 144:ef7eb2e8f9f7 35 LPC_SC->PCON = 0x0;
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 // SRC[SLEEPDEEP] set to 0 = sleep
<> 144:ef7eb2e8f9f7 38 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 // wait for interrupt
<> 144:ef7eb2e8f9f7 41 __WFI();
<> 144:ef7eb2e8f9f7 42 }
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 /*
<> 144:ef7eb2e8f9f7 45 * The mbed lpc1768 does not support the deepsleep mode
<> 144:ef7eb2e8f9f7 46 * as a debugger is connected to it (the mbed interface).
<> 144:ef7eb2e8f9f7 47 *
<> 144:ef7eb2e8f9f7 48 * As mentionned in an application note from NXP:
<> 144:ef7eb2e8f9f7 49 *
<> 144:ef7eb2e8f9f7 50 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
<> 144:ef7eb2e8f9f7 51 *
<> 144:ef7eb2e8f9f7 52 * {{{
<> 144:ef7eb2e8f9f7 53 * The user should be aware of certain limitations during debugging.
<> 144:ef7eb2e8f9f7 54 * The most important is that, due to limitations of the Cortex-M3
<> 144:ef7eb2e8f9f7 55 * integration, the LPC17xx cannot wake up in the usual manner from
<> 144:ef7eb2e8f9f7 56 * Deep Sleep and Power-down modes. It is recommended not to use these
<> 144:ef7eb2e8f9f7 57 * modes during debug. Once an application is downloaded via JTAG/SWD
<> 144:ef7eb2e8f9f7 58 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
<> 144:ef7eb2e8f9f7 59 * should be removed from the target board, and thereafter, power cycle
<> 144:ef7eb2e8f9f7 60 * the LPC17xx to allow wake-up from deep sleep and power-down modes
<> 144:ef7eb2e8f9f7 61 * }}}
<> 144:ef7eb2e8f9f7 62 *
<> 144:ef7eb2e8f9f7 63 * As the interface firmware does not reset the target when a
<> 144:ef7eb2e8f9f7 64 * mbed_interface_disconnect() semihosting call is made, the
<> 144:ef7eb2e8f9f7 65 * core cannot wake-up from deepsleep.
<> 144:ef7eb2e8f9f7 66 *
<> 144:ef7eb2e8f9f7 67 * We treat a deepsleep() as a normal sleep().
<> 144:ef7eb2e8f9f7 68 */
<> 144:ef7eb2e8f9f7 69
<> 160:d5399cc887bb 70 void hal_deepsleep(void) {
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 #if (DEVICE_SEMIHOST == 1)
<> 144:ef7eb2e8f9f7 73 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 74 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 75 #endif
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 // PCON[PD] set to deepsleep
<> 160:d5399cc887bb 78 hal_sleep();
<> 144:ef7eb2e8f9f7 79 }