Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/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 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 2 * @file sleep.c
<> 144:ef7eb2e8f9f7 3 *******************************************************************************
<> 144:ef7eb2e8f9f7 4 * @section License
<> 144:ef7eb2e8f9f7 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
<> 144:ef7eb2e8f9f7 6 *******************************************************************************
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * SPDX-License-Identifier: Apache-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 144:ef7eb2e8f9f7 11 * not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 12 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 13 *
<> 144:ef7eb2e8f9f7 14 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 144:ef7eb2e8f9f7 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 19 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 20 * limitations under the License.
<> 144:ef7eb2e8f9f7 21 *
<> 144:ef7eb2e8f9f7 22 ******************************************************************************/
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 #include "device.h"
<> 144:ef7eb2e8f9f7 25 #if DEVICE_SLEEP
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 #include "sleep_api.h"
<> 144:ef7eb2e8f9f7 28 #include "sleepmodes.h"
<> 144:ef7eb2e8f9f7 29 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 30 #include "em_emu.h"
<> 144:ef7eb2e8f9f7 31 #include "critical.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0};
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 /**
<> 144:ef7eb2e8f9f7 36 * Sleep mode.
<> 144:ef7eb2e8f9f7 37 * Enter the lowest possible sleep mode that is not blocked by ongoing activity.
<> 144:ef7eb2e8f9f7 38 */
<> 144:ef7eb2e8f9f7 39 void sleep(void)
<> 144:ef7eb2e8f9f7 40 {
<> 144:ef7eb2e8f9f7 41 if (sleep_block_counter[0] > 0) {
<> 144:ef7eb2e8f9f7 42 /* Blocked everything below EM0, so just return */
<> 144:ef7eb2e8f9f7 43 return;
<> 144:ef7eb2e8f9f7 44 } else if (sleep_block_counter[1] > 0) {
<> 144:ef7eb2e8f9f7 45 /* Blocked everything below EM1, enter EM1 */
<> 144:ef7eb2e8f9f7 46 EMU_EnterEM1();
<> 144:ef7eb2e8f9f7 47 } else if (sleep_block_counter[2] > 0) {
<> 144:ef7eb2e8f9f7 48 /* Blocked everything below EM2, enter EM2 */
<> 144:ef7eb2e8f9f7 49 EMU_EnterEM2(true);
<> 144:ef7eb2e8f9f7 50 } else {
<> 144:ef7eb2e8f9f7 51 /* Blocked everything below EM3, enter EM3 */
<> 144:ef7eb2e8f9f7 52 EMU_EnterEM3(true);
<> 144:ef7eb2e8f9f7 53 } /* Never enter EM4, as mbed has no way of configuring EM4 wakeup */
<> 144:ef7eb2e8f9f7 54 return;
<> 144:ef7eb2e8f9f7 55 }
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 /**
<> 144:ef7eb2e8f9f7 58 * Deep Sleep mode.
<> 144:ef7eb2e8f9f7 59 * Enter Energy Mode 2, turning off all high-frequency clocks.
<> 144:ef7eb2e8f9f7 60 *
<> 144:ef7eb2e8f9f7 61 * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
<> 144:ef7eb2e8f9f7 62 * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
<> 144:ef7eb2e8f9f7 63 * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still
<> 144:ef7eb2e8f9f7 64 * available. This gives a high degree of autonomous operation with a current
<> 144:ef7eb2e8f9f7 65 * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out
<> 144:ef7eb2e8f9f7 66 * Detection and full RAM and CPU retention is also included.
<> 144:ef7eb2e8f9f7 67 */
<> 144:ef7eb2e8f9f7 68 void deepsleep(void)
<> 144:ef7eb2e8f9f7 69 {
<> 144:ef7eb2e8f9f7 70 EMU_EnterEM2(true);
<> 144:ef7eb2e8f9f7 71 }
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 /** Block the microcontroller from sleeping below a certain mode
<> 144:ef7eb2e8f9f7 74 *
<> 144:ef7eb2e8f9f7 75 * This will block sleep() from entering an energy mode below the one given.
<> 144:ef7eb2e8f9f7 76 * -- To be called by peripheral HAL's --
<> 144:ef7eb2e8f9f7 77 *
<> 144:ef7eb2e8f9f7 78 * After the peripheral is finished with the operation, it should call unblock with the same state
<> 144:ef7eb2e8f9f7 79 *
<> 144:ef7eb2e8f9f7 80 */
<> 144:ef7eb2e8f9f7 81 void blockSleepMode(sleepstate_enum minimumMode)
<> 144:ef7eb2e8f9f7 82 {
<> 144:ef7eb2e8f9f7 83 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 84 sleep_block_counter[minimumMode]++;
<> 144:ef7eb2e8f9f7 85 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 86 }
<> 144:ef7eb2e8f9f7 87
<> 144:ef7eb2e8f9f7 88 /** Unblock the microcontroller from sleeping below a certain mode
<> 144:ef7eb2e8f9f7 89 *
<> 144:ef7eb2e8f9f7 90 * This will unblock sleep() from entering an energy mode below the one given.
<> 144:ef7eb2e8f9f7 91 * -- To be called by peripheral HAL's --
<> 144:ef7eb2e8f9f7 92 *
<> 144:ef7eb2e8f9f7 93 * This should be called after all transactions on a peripheral are done.
<> 144:ef7eb2e8f9f7 94 */
<> 144:ef7eb2e8f9f7 95 void unblockSleepMode(sleepstate_enum minimumMode)
<> 144:ef7eb2e8f9f7 96 {
<> 144:ef7eb2e8f9f7 97 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 98 if(sleep_block_counter[minimumMode] > 0) {
<> 144:ef7eb2e8f9f7 99 sleep_block_counter[minimumMode]--;
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 102 }
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 #endif