Aravind Vadali / mbed-src-AV

mbed.h library with any bug fixes AV finds.

Dependents:   micromouse4_encoder_testing PID_Test Lab1_Test WorkingPID ... more

targets/hal/TARGET_NXP/TARGET_LPC176X/sleep.c@1:ebce2ad32f95, 2015-11-02 (annotated)

Committer:
aravindsv
Date:
Mon Nov 02 03:07:12 2015 +0000
Revision:
1:ebce2ad32f95
Parent:
0:ba7650f404af 
Changed the RCC timeout value to 500 ms, so total code startup time before program starts running is ~1s. Hopefully no side-effects from lower startup timeouts

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aravindsv 0:ba7650f404af 1 /* mbed Microcontroller Library
aravindsv 0:ba7650f404af 2 * Copyright (c) 2006-2013 ARM Limited
aravindsv 0:ba7650f404af 3 *
aravindsv 0:ba7650f404af 4 * Licensed under the Apache License, Version 2.0 (the "License");
aravindsv 0:ba7650f404af 5 * you may not use this file except in compliance with the License.
aravindsv 0:ba7650f404af 6 * You may obtain a copy of the License at
aravindsv 0:ba7650f404af 7 *
aravindsv 0:ba7650f404af 8 * http://www.apache.org/licenses/LICENSE-2.0
aravindsv 0:ba7650f404af 9 *
aravindsv 0:ba7650f404af 10 * Unless required by applicable law or agreed to in writing, software
aravindsv 0:ba7650f404af 11 * distributed under the License is distributed on an "AS IS" BASIS,
aravindsv 0:ba7650f404af 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
aravindsv 0:ba7650f404af 13 * See the License for the specific language governing permissions and
aravindsv 0:ba7650f404af 14 * limitations under the License.
aravindsv 0:ba7650f404af 15 */
aravindsv 0:ba7650f404af 16 #include "sleep_api.h"
aravindsv 0:ba7650f404af 17 #include "cmsis.h"
aravindsv 0:ba7650f404af 18 #include "mbed_interface.h"
aravindsv 0:ba7650f404af 19
aravindsv 0:ba7650f404af 20 void sleep(void) {
aravindsv 0:ba7650f404af 21
aravindsv 0:ba7650f404af 22 #if (DEVICE_SEMIHOST == 1)
aravindsv 0:ba7650f404af 23 // ensure debug is disconnected
aravindsv 0:ba7650f404af 24 mbed_interface_disconnect();
aravindsv 0:ba7650f404af 25 #endif
aravindsv 0:ba7650f404af 26
aravindsv 0:ba7650f404af 27 // PCON[PD] set to sleep
aravindsv 0:ba7650f404af 28 LPC_SC->PCON = 0x0;
aravindsv 0:ba7650f404af 29
aravindsv 0:ba7650f404af 30 // SRC[SLEEPDEEP] set to 0 = sleep
aravindsv 0:ba7650f404af 31 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
aravindsv 0:ba7650f404af 32
aravindsv 0:ba7650f404af 33 // wait for interrupt
aravindsv 0:ba7650f404af 34 __WFI();
aravindsv 0:ba7650f404af 35 }
aravindsv 0:ba7650f404af 36
aravindsv 0:ba7650f404af 37 /*
aravindsv 0:ba7650f404af 38 * The mbed lpc1768 does not support the deepsleep mode
aravindsv 0:ba7650f404af 39 * as a debugger is connected to it (the mbed interface).
aravindsv 0:ba7650f404af 40 *
aravindsv 0:ba7650f404af 41 * As mentionned in an application note from NXP:
aravindsv 0:ba7650f404af 42 *
aravindsv 0:ba7650f404af 43 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
aravindsv 0:ba7650f404af 44 *
aravindsv 0:ba7650f404af 45 * {{{
aravindsv 0:ba7650f404af 46 * The user should be aware of certain limitations during debugging.
aravindsv 0:ba7650f404af 47 * The most important is that, due to limitations of the Cortex-M3
aravindsv 0:ba7650f404af 48 * integration, the LPC17xx cannot wake up in the usual manner from
aravindsv 0:ba7650f404af 49 * Deep Sleep and Power-down modes. It is recommended not to use these
aravindsv 0:ba7650f404af 50 * modes during debug. Once an application is downloaded via JTAG/SWD
aravindsv 0:ba7650f404af 51 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
aravindsv 0:ba7650f404af 52 * should be removed from the target board, and thereafter, power cycle
aravindsv 0:ba7650f404af 53 * the LPC17xx to allow wake-up from deep sleep and power-down modes
aravindsv 0:ba7650f404af 54 * }}}
aravindsv 0:ba7650f404af 55 *
aravindsv 0:ba7650f404af 56 * As the interface firmware does not reset the target when a
aravindsv 0:ba7650f404af 57 * mbed_interface_disconnect() semihosting call is made, the
aravindsv 0:ba7650f404af 58 * core cannot wake-up from deepsleep.
aravindsv 0:ba7650f404af 59 *
aravindsv 0:ba7650f404af 60 * We treat a deepsleep() as a normal sleep().
aravindsv 0:ba7650f404af 61 */
aravindsv 0:ba7650f404af 62
aravindsv 0:ba7650f404af 63 void deepsleep(void) {
aravindsv 0:ba7650f404af 64
aravindsv 0:ba7650f404af 65 #if (DEVICE_SEMIHOST == 1)
aravindsv 0:ba7650f404af 66 // ensure debug is disconnected
aravindsv 0:ba7650f404af 67 mbed_interface_disconnect();
aravindsv 0:ba7650f404af 68 #endif
aravindsv 0:ba7650f404af 69
aravindsv 0:ba7650f404af 70 // PCON[PD] set to deepsleep
aravindsv 0:ba7650f404af 71 sleep();
aravindsv 0:ba7650f404af 72 }