mirror of https://github.com/ARMmbed/mbed-os.git
121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015-2016 Nuvoton
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "sleep_api.h"
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#include "serial_api.h"
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#include "lp_ticker_api.h"
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#if DEVICE_SLEEP
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#include "cmsis.h"
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#include "device.h"
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#include "objects.h"
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#include "PeripheralPins.h"
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void us_ticker_prepare_sleep(struct sleep_s *obj);
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void us_ticker_wakeup_from_sleep(struct sleep_s *obj);
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static void mbed_enter_sleep(struct sleep_s *obj);
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static void mbed_exit_sleep(struct sleep_s *obj);
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int serial_allow_powerdown(void);
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int spi_allow_powerdown(void);
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int i2c_allow_powerdown(void);
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int pwmout_allow_powerdown(void);
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/**
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* Enter Idle mode.
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*/
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void sleep(void)
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{
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struct sleep_s sleep_obj;
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sleep_obj.powerdown = 0;
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mbed_enter_sleep(&sleep_obj);
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mbed_exit_sleep(&sleep_obj);
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}
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/**
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* Enter Power-down mode while no peripheral is active; otherwise, enter Idle mode.
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*/
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void deepsleep(void)
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{
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struct sleep_s sleep_obj;
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sleep_obj.powerdown = 1;
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mbed_enter_sleep(&sleep_obj);
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mbed_exit_sleep(&sleep_obj);
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}
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static void mbed_enter_sleep(struct sleep_s *obj)
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{
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// Check if serial allows entering power-down mode
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if (obj->powerdown) {
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obj->powerdown = serial_allow_powerdown();
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}
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// Check if spi allows entering power-down mode
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if (obj->powerdown) {
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obj->powerdown = spi_allow_powerdown();
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}
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// Check if i2c allows entering power-down mode
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if (obj->powerdown) {
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obj->powerdown = i2c_allow_powerdown();
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}
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// Check if pwmout allows entering power-down mode
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if (obj->powerdown) {
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obj->powerdown = pwmout_allow_powerdown();
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}
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// TODO: Check if other peripherals allow entering power-down mode
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obj->start_us = lp_ticker_read();
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// Let us_ticker prepare for power-down or reject it.
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us_ticker_prepare_sleep(obj);
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// NOTE(STALE): To pass mbed-drivers test, timer requires to be fine-grained, so its implementation needs HIRC rather than LIRC/LXT as its clock source.
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// But as CLK_PowerDown()/CLK_Idle() is called, HIRC will be disabled and timer cannot keep counting and alarm. To overcome the dilemma,
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// just make CPU halt and compromise power saving.
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// NOTE: As CLK_PowerDown()/CLK_Idle() is called, HIRC/HXT will be disabled in normal mode, but not in ICE mode. This may cause confusion in development.
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if (obj->powerdown) { // Power-down mode (HIRC/HXT disabled, LIRC/LXT enabled)
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SYS_UnlockReg();
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CLK_PowerDown();
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SYS_LockReg();
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}
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else { // CPU halt mode (HIRC/HXT enabled, LIRC/LXT enabled)
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// NOTE: NUC472's CLK_Idle() will also disable HIRC/HXT.
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SYS_UnlockReg();
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SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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CLK->PWRCTL &= ~CLK_PWRCTL_PDEN_Msk;
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__WFI();
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SYS_LockReg();
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}
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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obj->end_us = lp_ticker_read();
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obj->period_us = (obj->end_us > obj->start_us) ? (obj->end_us - obj->start_us) : (uint32_t) ((uint64_t) obj->end_us + 0xFFFFFFFFu - obj->start_us);
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// Let us_ticker recover from power-down.
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us_ticker_wakeup_from_sleep(obj);
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}
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static void mbed_exit_sleep(struct sleep_s *obj)
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{
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// TODO: TO BE CONTINUED
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(void)obj;
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}
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#endif
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