Mateusz Kowalik / Application

USB Serial application

Fork of USBSerial_HelloWorld by Samuel Mokrani

mbed-dev/targets/TARGET_NXP/TARGET_LPC11UXX/sleep.c@10:41552d038a69, 2017-01-10 (annotated)

Committer:
Zaitsev
Date:
Tue Jan 10 20:42:26 2017 +0000
Revision:
10:41552d038a69
USB Serial bi-directional bridge

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Zaitsev 10:41552d038a69 1 /* mbed Microcontroller Library
Zaitsev 10:41552d038a69 2 * Copyright (c) 2006-2013 ARM Limited
Zaitsev 10:41552d038a69 3 *
Zaitsev 10:41552d038a69 4 * Licensed under the Apache License, Version 2.0 (the "License");
Zaitsev 10:41552d038a69 5 * you may not use this file except in compliance with the License.
Zaitsev 10:41552d038a69 6 * You may obtain a copy of the License at
Zaitsev 10:41552d038a69 7 *
Zaitsev 10:41552d038a69 8 * http://www.apache.org/licenses/LICENSE-2.0
Zaitsev 10:41552d038a69 9 *
Zaitsev 10:41552d038a69 10 * Unless required by applicable law or agreed to in writing, software
Zaitsev 10:41552d038a69 11 * distributed under the License is distributed on an "AS IS" BASIS,
Zaitsev 10:41552d038a69 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Zaitsev 10:41552d038a69 13 * See the License for the specific language governing permissions and
Zaitsev 10:41552d038a69 14 * limitations under the License.
Zaitsev 10:41552d038a69 15 */
Zaitsev 10:41552d038a69 16 #include "sleep_api.h"
Zaitsev 10:41552d038a69 17 #include "cmsis.h"
Zaitsev 10:41552d038a69 18 #include "mbed_interface.h"
Zaitsev 10:41552d038a69 19
Zaitsev 10:41552d038a69 20 void sleep(void) {
Zaitsev 10:41552d038a69 21 // ensure debug is disconnected
Zaitsev 10:41552d038a69 22 #if DEVICE_SEMIHOST
Zaitsev 10:41552d038a69 23 mbed_interface_disconnect();
Zaitsev 10:41552d038a69 24 #endif
Zaitsev 10:41552d038a69 25
Zaitsev 10:41552d038a69 26 // PCON[PD] set to sleep
Zaitsev 10:41552d038a69 27 LPC_PMU->PCON = 0x0;
Zaitsev 10:41552d038a69 28
Zaitsev 10:41552d038a69 29 // SRC[SLEEPDEEP] set to 0 = sleep
Zaitsev 10:41552d038a69 30 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
Zaitsev 10:41552d038a69 31
Zaitsev 10:41552d038a69 32 // wait for interrupt
Zaitsev 10:41552d038a69 33 __WFI();
Zaitsev 10:41552d038a69 34 }
Zaitsev 10:41552d038a69 35
Zaitsev 10:41552d038a69 36 /*
Zaitsev 10:41552d038a69 37 * The mbed lpc1768 does not support the deepsleep mode
Zaitsev 10:41552d038a69 38 * as a debugger is connected to it (the mbed interface).
Zaitsev 10:41552d038a69 39 *
Zaitsev 10:41552d038a69 40 * As mentionned in an application note from NXP:
Zaitsev 10:41552d038a69 41 *
Zaitsev 10:41552d038a69 42 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
Zaitsev 10:41552d038a69 43 *
Zaitsev 10:41552d038a69 44 * {{{
Zaitsev 10:41552d038a69 45 * The user should be aware of certain limitations during debugging.
Zaitsev 10:41552d038a69 46 * The most important is that, due to limitations of the Cortex-M3
Zaitsev 10:41552d038a69 47 * integration, the LPC17xx cannot wake up in the usual manner from
Zaitsev 10:41552d038a69 48 * Deep Sleep and Power-down modes. It is recommended not to use these
Zaitsev 10:41552d038a69 49 * modes during debug. Once an application is downloaded via JTAG/SWD
Zaitsev 10:41552d038a69 50 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
Zaitsev 10:41552d038a69 51 * should be removed from the target board, and thereafter, power cycle
Zaitsev 10:41552d038a69 52 * the LPC17xx to allow wake-up from deep sleep and power-down modes
Zaitsev 10:41552d038a69 53 * }}}
Zaitsev 10:41552d038a69 54 *
Zaitsev 10:41552d038a69 55 * As the interface firmware does not reset the target when a
Zaitsev 10:41552d038a69 56 * mbed_interface_disconnect() semihosting call is made, the
Zaitsev 10:41552d038a69 57 * core cannot wake-up from deepsleep.
Zaitsev 10:41552d038a69 58 *
Zaitsev 10:41552d038a69 59 * We treat a deepsleep() as a normal sleep().
Zaitsev 10:41552d038a69 60 */
Zaitsev 10:41552d038a69 61
Zaitsev 10:41552d038a69 62 void deepsleep(void) {
Zaitsev 10:41552d038a69 63 // ensure debug is disconnected
Zaitsev 10:41552d038a69 64 #if DEVICE_SEMIHOST
Zaitsev 10:41552d038a69 65 mbed_interface_disconnect();
Zaitsev 10:41552d038a69 66 #endif
Zaitsev 10:41552d038a69 67
Zaitsev 10:41552d038a69 68 // PCON[PD] set to deepsleep
Zaitsev 10:41552d038a69 69 LPC_PMU->PCON = 0x1;
Zaitsev 10:41552d038a69 70
Zaitsev 10:41552d038a69 71 // SRC[SLEEPDEEP] set to 1 = deep sleep
Zaitsev 10:41552d038a69 72 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
Zaitsev 10:41552d038a69 73
Zaitsev 10:41552d038a69 74 // Power up everything after powerdown
Zaitsev 10:41552d038a69 75 LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;
Zaitsev 10:41552d038a69 76
Zaitsev 10:41552d038a69 77 // wait for interrupt
Zaitsev 10:41552d038a69 78 __WFI();
Zaitsev 10:41552d038a69 79 }