mbed-os/targets/TARGET_NUVOTON/TARGET_M2351/sleep.c

/* mbed Microcontroller Library
 * Copyright (c) 2017-2018 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"

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.
 */


#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
__attribute__((cmse_nonsecure_entry))
void hal_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.
 */
__attribute__((cmse_nonsecure_entry))
void hal_deepsleep(void)
{
    struct sleep_s sleep_obj;
    sleep_obj.powerdown = 1;
    mbed_enter_sleep(&sleep_obj);
    mbed_exit_sleep(&sleep_obj);
}
#endif

static void mbed_enter_sleep(struct sleep_s *obj)
{
#if 0
    // 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
#endif
  
    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();
}

static void mbed_exit_sleep(struct sleep_s *obj)
{
    // TODO: TO BE CONTINUED
    
    (void)obj;
}

#endif