Import Mbed OS hard-float snapshot

targets/TARGET_Silicon_Labs/TARGET_EFM32/common/mbed_overrides.c

@@ -0,0 +1,130 @@
+/***************************************************************************//**
+ * @file mbed_overrides.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 "em_chip.h"
+#include "em_device.h"
+#include "em_cmu.h"
+#include "em_emu.h"
+#include "device_peripherals.h"
+#include "device.h"
+#include "em_usart.h"
+#include "gpio_api.h"
+#include "clocking.h"
+
+gpio_t bc_enable;
+
+/* Called before main - implement here if board needs it.
+ * Otherwise, let the application override this if necessary */
+void mbed_sdk_init()
+{
+    CHIP_Init();
+
+#if defined(_SILICON_LABS_32B_SERIES_1)
+#if defined(EMU_NO_DCDC)
+    EMU_DCDCPowerOff();
+#else
+    EMU_DCDCInit_TypeDef dcdcInit = EMU_DCDCINIT_STK_DEFAULT;
+    EMU_DCDCInit(&dcdcInit);
+#endif
+
+#if (CORE_CLOCK_SOURCE == HFXO)
+    // Only init HFXO if not already done (e.g. by bootloader)
+    if (CMU_ClockSelectGet(cmuClock_HF) != cmuSelect_HFXO) {
+#if defined(_EFR_DEVICE)
+        CMU_HFXOInit_TypeDef hfxoInit = CMU_HFXOINIT_WSTK_DEFAULT;
+#else
+        CMU_HFXOInit_TypeDef hfxoInit = CMU_HFXOINIT_STK_DEFAULT;
+#endif
+        CMU_HFXOInit(&hfxoInit);
+    }
+#endif
+#endif
+
+    /* Set up the clock sources for this chip */
+#if( CORE_CLOCK_SOURCE == HFXO)
+    CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFXO);
+    SystemHFXOClockSet(HFXO_FREQUENCY);
+#elif( CORE_CLOCK_SOURCE == HFRCO)
+    CMU_ClockSelectSet(cmuClock_HF, cmuSelect_HFRCO);
+# if defined _CMU_HFRCOCTRL_BAND_MASK
+    CMU_HFRCOBandSet(HFRCO_FREQUENCY_ENUM);
+# elif defined _CMU_HFRCOCTRL_FREQRANGE_MASK
+    CMU_HFRCOFreqSet(HFRCO_FREQUENCY_ENUM);
+# else
+#  error "Can't set HFRCO frequency"
+# endif
+#else
+# error "Core clock selection not valid (mbed_overrides.c)"
+#endif
+
+    CMU_ClockEnable(cmuClock_CORELE, true);
+
+#if( LOW_ENERGY_CLOCK_SOURCE == LFXO )
+# ifdef _CMU_LFACLKEN0_MASK
+    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);
+# endif
+# ifdef _CMU_LFBCLKEN0_MASK
+    /* cmuClock_LFB (to date) only has LEUART peripherals.
+    *  This gets set automatically whenever you create serial objects using LEUART
+    */
+# endif
+# ifdef _CMU_LFECLKEN0_MASK
+    CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFXO);
+# endif
+    SystemLFXOClockSet(LFXO_FREQUENCY);
+
+#elif( LOW_ENERGY_CLOCK_SOURCE == LFRCO )
+# ifdef _CMU_LFACLKEN0_MASK
+    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFRCO);
+# endif
+# ifdef _CMU_LFBCLKEN0_MASK
+    //CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFRCO);
+# endif
+# ifdef _CMU_LFECLKEN0_MASK
+    CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFRCO);
+# endif
+
+#elif( LOW_ENERGY_CLOCK_SOURCE == ULFRCO)
+# ifdef _CMU_LFACLKEN0_MASK
+    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_ULFRCO);
+# endif
+# ifdef _CMU_LFBCLKEN0_MASK
+    CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_ULFRCO);
+# endif
+# ifdef _CMU_LFECLKEN0_MASK
+    CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_ULFRCO);
+# endif
+#else
+# error "Low energy clock selection not valid"
+#endif
+
+#if defined(RTCC_PRESENT)
+    /* Turn RTCC clock gate back on to keep RTC time correct */
+    CMU_ClockEnable(cmuClock_RTCC, true);
+#endif
+
+#if defined(EFM_BC_EN)
+    /* Enable BC line driver to avoid garbage on CDC port */
+    gpio_init_out_ex(&bc_enable, EFM_BC_EN, 1);
+#endif
+}