FastModel: add HAL sleep implementation

Author: Qinghao Shi

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/sleep_api.c

@@ -0,0 +1,64 @@
+
+/** \addtogroup hal */
+/** @{*/
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 Arm Limited
+ *
+ * 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 "us_ticker_api.h"
+
+#include "PeripheralNames.h"
+#define US_TICKER_COUNTER     CMSDK_DUALTIMER1
+#define US_TICKER_INTERRUPT   CMSDK_DUALTIMER2
+#define US_TICKER_TIMER_IRQn  DUALTIMER_IRQn
+
+
+#if DEVICE_SLEEP
+
+void hal_sleep(void)
+{
+    __WFI();
+}
+
+/* Since there is no power management function implemented in MPS2,
+ * Also Deep Sleep mode mean to save power which is not practical on a simulator.
+ * So mbed HAL Deep sleep is mocked by Sleep,
+ * representing a "Waiting For Interrupt" state,
+ * but disabling the Microsec ticker in addition */
+
+void hal_deepsleep(void)
+{
+#if DEVICE_USTICKER
+    uint32_t val = US_TICKER_COUNTER->TimerValue;
+    US_TICKER_COUNTER->TimerControl &= ~CMSDK_DUALTIMER1_CTRL_EN_Msk;
+    US_TICKER_INTERRUPT->TimerControl &= ~CMSDK_DUALTIMER2_CTRL_EN_Msk;
+    US_TICKER_INTERRUPT->TimerControl &= ~CMSDK_DUALTIMER2_CTRL_INTEN_Msk;
+#endif
+
+    __WFI();
+
+#if DEVICE_USTICKER
+    US_TICKER_COUNTER->TimerLoad = val;
+    US_TICKER_COUNTER->TimerControl |= CMSDK_DUALTIMER1_CTRL_EN_Msk;
+    US_TICKER_INTERRUPT->TimerControl |= CMSDK_DUALTIMER1_CTRL_INTEN_Msk;
+    US_TICKER_INTERRUPT->TimerControl |= CMSDK_DUALTIMER2_CTRL_EN_Msk;
+#endif
+}
+
+#endif
+
+/**@}*/