Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/mbed_overrides.c

Revision:

0:9b334a45a8ff

Child:

50:a417edff4437

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/mbed_overrides.c	Thu Oct 01 15:25:22 2015 +0300
@@ -0,0 +1,124 @@
+/***************************************************************************//**
+ * @file mbed_overrides.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
+ * obligation to support this Software. Silicon Labs is providing the
+ * Software "AS IS", with no express or implied warranties of any kind,
+ * including, but not limited to, any implied warranties of merchantability
+ * or fitness for any particular purpose or warranties against infringement
+ * of any proprietary rights of a third party.
+ *
+ * Silicon Labs will not be liable for any consequential, incidental, or
+ * special damages, or any other relief, or for any claim by any third party,
+ * arising from your use of this Software.
+ *
+ ******************************************************************************/
+
+#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"
+
+gpio_t bc_enable;
+
+void check_usart_clock(USART_TypeDef* usart, uint32_t clockmask);
+
+/* Called before main - implement here if board needs it.
+ * Otherwise, let the application override this if necessary */
+void mbed_sdk_init()
+{
+    CHIP_Init();
+
+    /* 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);
+    CMU_HFRCOBandSet(HFRCO_FREQUENCY);
+#else
+#error "Core clock selection not valid (mbed_overrides.c)"
+#endif
+
+    CMU_ClockEnable(cmuClock_CORELE, true);
+
+#if( LOW_ENERGY_CLOCK_SOURCE == LFXO )
+#ifdef CMU_LFACLKSEL_REG
+    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);
+#endif
+#ifdef CMU_LFBCLKSEL_REG
+    /* cmuClock_LFB (to date) only has LEUART peripherals.
+    *  This gets set automatically whenever you create serial objects using LEUART
+    */
+#endif
+#ifdef CMU_LFECLKSEL_REG
+    CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFXO);
+#endif
+    SystemLFXOClockSet(LFXO_FREQUENCY);
+
+#elif( LOW_ENERGY_CLOCK_SOURCE == LFRCO )
+#ifdef CMU_LFACLKSEL_REG
+    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFRCO);
+#endif
+#ifdef CMU_LFBCLKSEL_REG
+    //CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFRCO);
+#endif
+#ifdef CMU_LFECLKSEL_REG
+    CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_LFRCO);
+#endif
+    CMU_HFRCOBandSet(HFRCO_FREQUENCY);
+
+#elif( LOW_ENERGY_CLOCK_SOURCE == ULFRCO)
+#ifdef CMU_LFACLKSEL_REG
+    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_ULFRCO);
+#endif
+#ifdef CMU_LFBCLKSEL_REG
+    CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_ULFRCO);
+#endif
+#ifdef CMU_LFECLKSEL_REG
+    CMU_ClockSelectSet(cmuClock_LFE, cmuSelect_ULFRCO);
+#endif
+#else
+#error "Low energy clock selection not valid"
+#endif
+
+    /* Enable BC line driver to avoid garbage on CDC port */
+    gpio_init_out_ex(&bc_enable, EFM_BC_EN, 1);
+}
+
+void check_usart_clock(USART_TypeDef* usart, uint32_t clockmask)
+{
+    uint32_t freq = 14000000, baudrate;
+    USART_OVS_TypeDef ovs;
+
+    if(CMU->HFPERCLKEN0 & clockmask) {
+        /* Different methods for sync vs async */
+        if(usart->CTRL & USART_CTRL_SYNC) {
+            ovs  = (USART_OVS_TypeDef) (usart->CTRL & _USART_CTRL_OVS_MASK);
+            baudrate = USART_BaudrateCalc(freq, usart->CLKDIV, true, ovs);
+            USART_BaudrateSyncSet(usart, 0, baudrate);
+        } else {
+            ovs  = (USART_OVS_TypeDef) (usart->CTRL & _USART_CTRL_OVS_MASK);
+            baudrate = USART_BaudrateCalc(freq, usart->CLKDIV, false, ovs);
+            USART_BaudrateAsyncSet(usart, 0, baudrate, ovs);
+        }
+    }
+}