Import Mbed OS hard-float snapshot

targets/TARGET_NUVOTON/TARGET_NANO100/device/system_Nano100Series.c

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+/******************************************************************************
+ * @file     system_Nano100Series.c
+ * @version  V1.00
+ * $Revision: 4 $
+ * $Date: 14/01/29 4:09p $
+ * @brief    Nano100 series system clock init code and assert handler
+ *
+ * @note
+ * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
+*****************************************************************************/
+
+#include <stdint.h>
+#include "Nano100Series.h"
+
+
+/*----------------------------------------------------------------------------
+  Clock Variable definitions
+ *----------------------------------------------------------------------------*/
+uint32_t SystemCoreClock  = __HSI;              /*!< System Clock Frequency (Core Clock) */
+uint32_t CyclesPerUs      = (__HSI / 1000000);  /*!< Cycles per micro second */
+
+/**
+  * @brief  Calculate current PLL clock frequency.
+  * @param  None.
+  * @return PLL clock frequency. The clock UNIT is in Hz.
+  */
+uint32_t SysGet_PLLClockFreq(void)
+{
+    uint32_t u32Freq =0, u32PLLSrc;
+    uint32_t u32NO, u32NR, u32IN_DV, u32PllReg;
+
+    u32PllReg = CLK->PLLCTL;
+
+    if (u32PllReg & CLK_PLLCTL_PD)
+        return 0;    /* PLL is in power down mode */
+
+    if (u32PllReg & CLK_PLLCTL_PLL_SRC_Msk)
+        u32PLLSrc = __HIRC12M;
+    else
+        u32PLLSrc = __HXT;
+
+    u32NO = (u32PllReg & CLK_PLLCTL_OUT_DV) ? 2: 1;
+
+    u32IN_DV = (u32PllReg & CLK_PLLCTL_IN_DV_Msk) >> 8;
+    if (u32IN_DV == 0)
+        u32NR = 2;
+    else if (u32IN_DV == 1)
+        u32NR = 4;
+    else if (u32IN_DV == 2)
+        u32NR = 8;
+    else
+        u32NR = 16;
+
+    u32Freq = u32PLLSrc * ((u32PllReg & CLK_PLLCTL_FB_DV_Msk) +32) / u32NR / u32NO;
+
+    return u32Freq;
+}
+
+
+/**
+  * @brief  Get current HCLK clock frequency.
+  * @param  None.
+  * @return HCLK clock frequency. The clock UNIT is in Hz.
+  */
+uint32_t SysGet_HCLKFreq(void)
+{
+
+    uint32_t u32Freqout, u32AHBDivider, u32ClkSel;
+
+    u32ClkSel = CLK->CLKSEL0 & CLK_CLKSEL0_HCLK_S_Msk;
+
+    if (u32ClkSel == CLK_CLKSEL0_HCLK_S_HXT) {  /* external HXT crystal clock */
+        u32Freqout = __HXT;
+    } else if(u32ClkSel == CLK_CLKSEL0_HCLK_S_LXT) {    /* external LXT crystal clock */
+        u32Freqout = __LXT;
+    } else if(u32ClkSel == CLK_CLKSEL0_HCLK_S_PLL) {    /* PLL clock */
+        u32Freqout = SysGet_PLLClockFreq();
+    } else if(u32ClkSel == CLK_CLKSEL0_HCLK_S_LIRC) { /* internal LIRC oscillator clock */
+        u32Freqout = __LIRC;
+    } else {                                /* internal HIRC oscillator clock */
+        u32Freqout = __HIRC12M;
+    }
+    u32AHBDivider = (CLK->CLKDIV0 & CLK_CLKDIV0_HCLK_N_Msk) + 1 ;
+
+    return (u32Freqout/u32AHBDivider);
+}
+
+
+/**
+  * @brief  This function is used to update the variable SystemCoreClock
+  *   and must be called whenever the core clock is changed.
+  * @param  None.
+  * @retval None.
+  */
+
+void SystemCoreClockUpdate (void)
+{
+
+    SystemCoreClock = SysGet_HCLKFreq();
+    CyclesPerUs = (SystemCoreClock + 500000) / 1000000;
+}
+
+#if USE_ASSERT
+
+/**
+ * @brief      Assert Error Message
+ *
+ * @param[in]  file  the source file name
+ * @param[in]  line  line number
+ *
+ * @return     None
+ *
+ * @details    The function prints the source file name and line number where
+ *             the ASSERT_PARAM() error occurs, and then stops in an infinite loop.
+ */
+void AssertError(uint8_t * file, uint32_t line)
+{
+
+    printf("[%s] line %d : wrong parameters.\r\n", file, line);
+
+    /* Infinite loop */
+    while(1) ;
+}
+#endif
+
+/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/