Diff: targets/TARGET_STM/sleep.c

Revision:

0:85b3fd62ea1a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/sleep.c	Mon Mar 16 06:35:48 2020 +0000
@@ -0,0 +1,109 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2016, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#if DEVICE_SLEEP
+
+#include "cmsis.h"
+#include "us_ticker_api.h"
+#include "sleep_api.h"
+#include "rtc_api_hal.h"
+#include "hal_tick.h"
+#include "mbed_critical.h"
+
+extern void HAL_SuspendTick(void);
+extern void HAL_ResumeTick(void);
+
+void hal_sleep(void)
+{
+    // Disable IRQs
+    core_util_critical_section_enter();
+
+    // Stop HAL tick to avoid to exit sleep in 1ms
+    HAL_SuspendTick();
+    // Request to enter SLEEP mode
+    HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
+    // Restart HAL tick
+    HAL_ResumeTick();
+
+    // Enable IRQs
+    core_util_critical_section_exit();
+}
+
+void hal_deepsleep(void)
+{
+    // Disable IRQs
+    core_util_critical_section_enter();
+
+    // Stop HAL tick
+    HAL_SuspendTick();
+    uint32_t EnterTimeUS = us_ticker_read();
+
+    // Request to enter STOP mode with regulator in low power mode
+#if TARGET_STM32L4
+    int pwrClockEnabled = __HAL_RCC_PWR_IS_CLK_ENABLED();
+    int lowPowerModeEnabled = PWR->CR1 & PWR_CR1_LPR;
+    
+    if (!pwrClockEnabled) {
+        __HAL_RCC_PWR_CLK_ENABLE();
+    }
+    if (lowPowerModeEnabled) {
+        HAL_PWREx_DisableLowPowerRunMode();
+    }
+    
+    HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
+    
+    if (lowPowerModeEnabled) {
+        HAL_PWREx_EnableLowPowerRunMode();
+    }
+    if (!pwrClockEnabled) {
+        __HAL_RCC_PWR_CLK_DISABLE();
+    }
+#else /* TARGET_STM32L4 */
+    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
+#endif /* TARGET_STM32L4 */
+
+    // Restart HAL tick
+    HAL_ResumeTick();
+
+    // Enable IRQs
+    core_util_critical_section_exit();
+
+    // After wake-up from STOP reconfigure the PLL
+    SetSysClock();
+
+    TIM_HandleTypeDef TimMasterHandle;
+    TimMasterHandle.Instance = TIM_MST;
+    __HAL_TIM_SET_COUNTER(&TimMasterHandle, EnterTimeUS);
+
+#if DEVICE_LOWPOWERTIMER
+    rtc_synchronize();
+#endif
+}
+
+#endif