mbed library sources. Supersedes mbed-src.
Fork of mbed-dev by
Diff: targets/TARGET_NUVOTON/TARGET_M451/sleep.c
- Revision:
- 153:9398a535854b
- Parent:
- 152:9a67f0b066fc
diff -r 9a67f0b066fc -r 9398a535854b targets/TARGET_NUVOTON/TARGET_M451/sleep.c --- a/targets/TARGET_NUVOTON/TARGET_M451/sleep.c Thu Dec 15 11:48:27 2016 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,118 +0,0 @@ -/* mbed Microcontroller Library - * Copyright (c) 2015-2016 Nuvoton - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "sleep_api.h" -#include "serial_api.h" -#include "lp_ticker_api.h" - -#if DEVICE_SLEEP - -#include "cmsis.h" -#include "device.h" -#include "objects.h" -#include "PeripheralPins.h" - -void us_ticker_prepare_sleep(struct sleep_s *obj); -void us_ticker_wakeup_from_sleep(struct sleep_s *obj); -static void mbed_enter_sleep(struct sleep_s *obj); -static void mbed_exit_sleep(struct sleep_s *obj); - -int serial_allow_powerdown(void); -int spi_allow_powerdown(void); -int i2c_allow_powerdown(void); -int pwmout_allow_powerdown(void); - -/** - * Enter Idle mode. - */ -void sleep(void) -{ - struct sleep_s sleep_obj; - sleep_obj.powerdown = 0; - mbed_enter_sleep(&sleep_obj); - mbed_exit_sleep(&sleep_obj); -} - -/** - * Enter Power-down mode while no peripheral is active; otherwise, enter Idle mode. - */ -void deepsleep(void) -{ - struct sleep_s sleep_obj; - sleep_obj.powerdown = 1; - mbed_enter_sleep(&sleep_obj); - mbed_exit_sleep(&sleep_obj); -} - - -void mbed_enter_sleep(struct sleep_s *obj) -{ - // Check if serial allows entering power-down mode - if (obj->powerdown) { - obj->powerdown = serial_allow_powerdown(); - } - // Check if spi allows entering power-down mode - if (obj->powerdown) { - obj->powerdown = spi_allow_powerdown(); - } - // Check if i2c allows entering power-down mode - if (obj->powerdown) { - obj->powerdown = i2c_allow_powerdown(); - } - // Check if pwmout allows entering power-down mode - if (obj->powerdown) { - obj->powerdown = pwmout_allow_powerdown(); - } - // TODO: Check if other peripherals allow entering power-down mode - - obj->start_us = lp_ticker_read(); - // Let us_ticker prepare for power-down or reject it. - us_ticker_prepare_sleep(obj); - - // 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. - // But as CLK_PowerDown()/CLK_Idle() is called, HIRC will be disabled and timer cannot keep counting and alarm. To overcome the dilemma, - // just make CPU halt and compromise power saving. - // 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. - - if (obj->powerdown) { // Power-down mode (HIRC/HXT disabled, LIRC/LXT enabled) - SYS_UnlockReg(); - CLK_PowerDown(); - SYS_LockReg(); - } - else { // CPU halt mode (HIRC/HXT enabled, LIRC/LXT enabled) - SYS_UnlockReg(); - CLK_Idle(); - SYS_LockReg(); - } - __NOP(); - __NOP(); - __NOP(); - __NOP(); - - obj->end_us = lp_ticker_read(); - 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); - // Let us_ticker recover from power-down. - us_ticker_wakeup_from_sleep(obj); -} - -void mbed_exit_sleep(struct sleep_s *obj) -{ - // TODO: TO BE CONTINUED - - (void)obj; -} - -#endif