Martin Gurtner / HKC_MiniCheetah

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mbed-dev/targets/TARGET_NXP/TARGET_LPC176X/sleep.c@60:8399756e1ba1, 2021-01-22 (annotated)

Committer:
MartinGurtner
Date:
Fri Jan 22 13:10:37 2021 +0000
Revision:
60:8399756e1ba1
.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MartinGurtner 60:8399756e1ba1 1 /* mbed Microcontroller Library
MartinGurtner 60:8399756e1ba1 2 * Copyright (c) 2006-2013 ARM Limited
MartinGurtner 60:8399756e1ba1 3 *
MartinGurtner 60:8399756e1ba1 4 * Licensed under the Apache License, Version 2.0 (the "License");
MartinGurtner 60:8399756e1ba1 5 * you may not use this file except in compliance with the License.
MartinGurtner 60:8399756e1ba1 6 * You may obtain a copy of the License at
MartinGurtner 60:8399756e1ba1 7 *
MartinGurtner 60:8399756e1ba1 8 * http://www.apache.org/licenses/LICENSE-2.0
MartinGurtner 60:8399756e1ba1 9 *
MartinGurtner 60:8399756e1ba1 10 * Unless required by applicable law or agreed to in writing, software
MartinGurtner 60:8399756e1ba1 11 * distributed under the License is distributed on an "AS IS" BASIS,
MartinGurtner 60:8399756e1ba1 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MartinGurtner 60:8399756e1ba1 13 * See the License for the specific language governing permissions and
MartinGurtner 60:8399756e1ba1 14 * limitations under the License.
MartinGurtner 60:8399756e1ba1 15 */
MartinGurtner 60:8399756e1ba1 16 #include "sleep_api.h"
MartinGurtner 60:8399756e1ba1 17 #include "cmsis.h"
MartinGurtner 60:8399756e1ba1 18 #include "mbed_interface.h"
MartinGurtner 60:8399756e1ba1 19
MartinGurtner 60:8399756e1ba1 20 void hal_sleep(void) {
MartinGurtner 60:8399756e1ba1 21
MartinGurtner 60:8399756e1ba1 22 #if (DEVICE_SEMIHOST == 1)
MartinGurtner 60:8399756e1ba1 23 // ensure debug is disconnected
MartinGurtner 60:8399756e1ba1 24 mbed_interface_disconnect();
MartinGurtner 60:8399756e1ba1 25 #endif
MartinGurtner 60:8399756e1ba1 26
MartinGurtner 60:8399756e1ba1 27 // PCON[PD] set to sleep
MartinGurtner 60:8399756e1ba1 28 LPC_SC->PCON = 0x0;
MartinGurtner 60:8399756e1ba1 29
MartinGurtner 60:8399756e1ba1 30 // SRC[SLEEPDEEP] set to 0 = sleep
MartinGurtner 60:8399756e1ba1 31 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
MartinGurtner 60:8399756e1ba1 32
MartinGurtner 60:8399756e1ba1 33 // wait for interrupt
MartinGurtner 60:8399756e1ba1 34 __WFI();
MartinGurtner 60:8399756e1ba1 35 }
MartinGurtner 60:8399756e1ba1 36
MartinGurtner 60:8399756e1ba1 37 /*
MartinGurtner 60:8399756e1ba1 38 * The mbed lpc1768 does not support the deepsleep mode
MartinGurtner 60:8399756e1ba1 39 * as a debugger is connected to it (the mbed interface).
MartinGurtner 60:8399756e1ba1 40 *
MartinGurtner 60:8399756e1ba1 41 * As mentionned in an application note from NXP:
MartinGurtner 60:8399756e1ba1 42 *
MartinGurtner 60:8399756e1ba1 43 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
MartinGurtner 60:8399756e1ba1 44 *
MartinGurtner 60:8399756e1ba1 45 * {{{
MartinGurtner 60:8399756e1ba1 46 * The user should be aware of certain limitations during debugging.
MartinGurtner 60:8399756e1ba1 47 * The most important is that, due to limitations of the Cortex-M3
MartinGurtner 60:8399756e1ba1 48 * integration, the LPC17xx cannot wake up in the usual manner from
MartinGurtner 60:8399756e1ba1 49 * Deep Sleep and Power-down modes. It is recommended not to use these
MartinGurtner 60:8399756e1ba1 50 * modes during debug. Once an application is downloaded via JTAG/SWD
MartinGurtner 60:8399756e1ba1 51 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
MartinGurtner 60:8399756e1ba1 52 * should be removed from the target board, and thereafter, power cycle
MartinGurtner 60:8399756e1ba1 53 * the LPC17xx to allow wake-up from deep sleep and power-down modes
MartinGurtner 60:8399756e1ba1 54 * }}}
MartinGurtner 60:8399756e1ba1 55 *
MartinGurtner 60:8399756e1ba1 56 * As the interface firmware does not reset the target when a
MartinGurtner 60:8399756e1ba1 57 * mbed_interface_disconnect() semihosting call is made, the
MartinGurtner 60:8399756e1ba1 58 * core cannot wake-up from deepsleep.
MartinGurtner 60:8399756e1ba1 59 *
MartinGurtner 60:8399756e1ba1 60 * We treat a deepsleep() as a normal sleep().
MartinGurtner 60:8399756e1ba1 61 */
MartinGurtner 60:8399756e1ba1 62
MartinGurtner 60:8399756e1ba1 63 void hal_deepsleep(void) {
MartinGurtner 60:8399756e1ba1 64
MartinGurtner 60:8399756e1ba1 65 #if (DEVICE_SEMIHOST == 1)
MartinGurtner 60:8399756e1ba1 66 // ensure debug is disconnected
MartinGurtner 60:8399756e1ba1 67 mbed_interface_disconnect();
MartinGurtner 60:8399756e1ba1 68 #endif
MartinGurtner 60:8399756e1ba1 69
MartinGurtner 60:8399756e1ba1 70 // PCON[PD] set to deepsleep
MartinGurtner 60:8399756e1ba1 71 hal_sleep();
MartinGurtner 60:8399756e1ba1 72 }