[STM32F7xx] Sleep API factorization

In order to enable sleep API factorization, HAL_Suspend/ResumeTick
functions have been implemented in hal_tick.c for each platform.

Author: Erwan GOURIOU

hal/targets/cmsis/TARGET_STM/TARGET_STM32F7/TARGET_DISCO_F746NG/hal_tick.c

@@ -126,6 +126,21 @@ HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
     return HAL_OK;
 }
 
+__INLINE void HAL_SuspendTick(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+
+    // Disable HAL tick and us_ticker update interrupts (used for 32 bit counter)
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
+
+__INLINE void HAL_ResumeTick(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+
+	// Enable HAL tick and us_ticker update interrupts (used for 32 bit counter)
+	__HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
 /**
   * @}
   */

hal/targets/cmsis/TARGET_STM/TARGET_STM32F7/TARGET_NUCLEO_F746ZG/hal_tick.c

@@ -126,6 +126,21 @@ HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
     return HAL_OK;
 }
 
+__INLINE void HAL_SuspendTick(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+
+    // Disable HAL tick and us_ticker update interrupts (used for 32 bit counter)
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
+
+__INLINE void HAL_ResumeTick(void)
+{
+    TimMasterHandle.Instance = TIM_MST;
+
+	// Enable HAL tick and us_ticker update interrupts (used for 32 bit counter)
+	__HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+}
 /**
   * @}
   */

hal/targets/hal/TARGET_STM/TARGET_STM32F7/sleep.c

@@ -33,20 +33,13 @@
 
 #include "cmsis.h"
 
-static TIM_HandleTypeDef TimMasterHandle;
-
-void sleep(void)
-{
-    TimMasterHandle.Instance = TIM5;
-
-    // Disable HAL tick interrupt
-    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC2);
-
+void sleep(void) {
+    // Stop HAL systick
+    HAL_SuspendTick();
     // Request to enter SLEEP mode
     HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
-
-    // Enable HAL tick interrupt
-    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC2);
+    // Restart HAL systick
+    HAL_ResumeTick();
 }
 
 void deepsleep(void)