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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2019 STMicroelectronics
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* SPDX-License-Identifier: Apache-2.0
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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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#if DEVICE_SLEEP
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#include "mbed_critical.h"
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extern void save_timer_ctx(void);
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extern void restore_timer_ctx(void);
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extern int serial_is_tx_ongoing(void);
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extern void PWR_EnterStopMode(void);
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extern void PWR_ExitStopMode(void);
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extern void SetSysClock(void);
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extern int mbed_sdk_inited;
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/* STM32WB has very specific needs to handling STOP mode.
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* The target has a cortex-M4 and cortex-M0 and needs to
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* handle shared ressources btw both cores.
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* Each core can sleep independantly, but the first one that
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* wakes-up needs to restore the clock tree.
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*/
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void hal_deepsleep(void)
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{
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/* WORKAROUND:
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* MBED serial driver does not handle deepsleep lock
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* to prevent entering deepsleep until HW serial FIFO is empty.
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* This is tracked in mbed issue 4408.
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* For now, we're checking all Serial HW FIFO. If any transfer is ongoing
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* we're not entering deep sleep and returning immediately. */
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if (serial_is_tx_ongoing()) {
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return;
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}
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// Disable IRQs
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core_util_critical_section_enter();
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save_timer_ctx();
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/* Prevent HAL_GetTick() from using ticker_read_us() to read the
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* us_ticker timestamp until the us_ticker context is restored. */
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mbed_sdk_inited = 0;
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PWR_EnterStopMode();
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PWR_ExitStopMode();
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/* Force complete clock reconfiguration */
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SetSysClock();
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restore_timer_ctx();
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/* us_ticker context restored, allow HAL_GetTick() to read the us_ticker
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* timestamp via ticker_read_us() again. */
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mbed_sdk_inited = 1;
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// Enable IRQs
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core_util_critical_section_exit();
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}
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#endif
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