Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_NXP/TARGET_LPC176X/sleep.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

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
<> 144:ef7eb2e8f9f7 20 void sleep(void) {
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #if (DEVICE_SEMIHOST == 1)
<> 144:ef7eb2e8f9f7 23 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 24 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 25 #endif
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 // PCON[PD] set to sleep
<> 144:ef7eb2e8f9f7 28 LPC_SC->PCON = 0x0;
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 // SRC[SLEEPDEEP] set to 0 = sleep
<> 144:ef7eb2e8f9f7 31 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 // wait for interrupt
<> 144:ef7eb2e8f9f7 34 __WFI();
<> 144:ef7eb2e8f9f7 35 }
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 /*
<> 144:ef7eb2e8f9f7 38 * The mbed lpc1768 does not support the deepsleep mode
<> 144:ef7eb2e8f9f7 39 * as a debugger is connected to it (the mbed interface).
<> 144:ef7eb2e8f9f7 40 *
<> 144:ef7eb2e8f9f7 41 * As mentionned in an application note from NXP:
<> 144:ef7eb2e8f9f7 42 *
<> 144:ef7eb2e8f9f7 43 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
<> 144:ef7eb2e8f9f7 44 *
<> 144:ef7eb2e8f9f7 45 * {{{
<> 144:ef7eb2e8f9f7 46 * The user should be aware of certain limitations during debugging.
<> 144:ef7eb2e8f9f7 47 * The most important is that, due to limitations of the Cortex-M3
<> 144:ef7eb2e8f9f7 48 * integration, the LPC17xx cannot wake up in the usual manner from
<> 144:ef7eb2e8f9f7 49 * Deep Sleep and Power-down modes. It is recommended not to use these
<> 144:ef7eb2e8f9f7 50 * modes during debug. Once an application is downloaded via JTAG/SWD
<> 144:ef7eb2e8f9f7 51 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
<> 144:ef7eb2e8f9f7 52 * should be removed from the target board, and thereafter, power cycle
<> 144:ef7eb2e8f9f7 53 * the LPC17xx to allow wake-up from deep sleep and power-down modes
<> 144:ef7eb2e8f9f7 54 * }}}
<> 144:ef7eb2e8f9f7 55 *
<> 144:ef7eb2e8f9f7 56 * As the interface firmware does not reset the target when a
<> 144:ef7eb2e8f9f7 57 * mbed_interface_disconnect() semihosting call is made, the
<> 144:ef7eb2e8f9f7 58 * core cannot wake-up from deepsleep.
<> 144:ef7eb2e8f9f7 59 *
<> 144:ef7eb2e8f9f7 60 * We treat a deepsleep() as a normal sleep().
<> 144:ef7eb2e8f9f7 61 */
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 void deepsleep(void) {
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 #if (DEVICE_SEMIHOST == 1)
<> 144:ef7eb2e8f9f7 66 // ensure debug is disconnected
<> 144:ef7eb2e8f9f7 67 mbed_interface_disconnect();
<> 144:ef7eb2e8f9f7 68 #endif
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 // PCON[PD] set to deepsleep
<> 144:ef7eb2e8f9f7 71 sleep();
<> 144:ef7eb2e8f9f7 72 }