请问关于K10dx64的芯片怎样使用外部晶振裸奔？有代码

ffbiao

     各位高手，本人调试K10dx64的板子时，使用Kei4软件新建一个k10的工程，也使用了ARM提供的初始化代码，现在可以使用内部的时钟裸奔，但是想用外部8MHz的晶振，但是配置总是有问题，运行不了，求助高手指导。
引用ARM提供的初始化代码如下：
#define CLOCK_SETUP     1
/* Predefined clock setups
   0 ... Multipurpose Clock Generator (MCG) in FLL Engaged Internal (FEI) mode
         Reference clock source for MCG module is the slow internal clock source 32.768kHz
         Core clock = 41.94MHz, BusClock = 41.94MHz
   1 ... Multipurpose Clock Generator (MCG) in PLL Engaged External (PEE) mode
         Reference clock source for MCG module is an external crystal 8MHz
         Core clock = 48MHz, BusClock = 48MHz
   2 ... Multipurpose Clock Generator (MCG) in Bypassed Low Power External (BLPE) mode
         Core clock/Bus clock derived directly from an external crystal 8MHz with no multiplication
         Core clock = 8MHz, BusClock = 8MHz
*/
/*----------------------------------------------------------------------------
  Define clock source values
 *----------------------------------------------------------------------------*/
#if (CLOCK_SETUP == 0)
    #define CPU_XTAL_CLK_HZ                 8000000u /* Value of the external crystal or oscillator clock frequency in Hz */
    #define CPU_XTAL32k_CLK_HZ              32768u   /* Value of the external 32k crystal or oscillator clock frequency in Hz */
    #define CPU_INT_SLOW_CLK_HZ             32768u   /* Value of the slow internal oscillator clock frequency in Hz  */
    #define CPU_INT_FAST_CLK_HZ             4000000u /* Value of the fast internal oscillator clock frequency in Hz  */
    #define DEFAULT_SYSTEM_CLOCK            41943040u /* Default System clock value */
#elif (CLOCK_SETUP == 1)
    #define CPU_XTAL_CLK_HZ                 8000000u /* Value of the external crystal or oscillator clock frequency in Hz */
    #define CPU_XTAL32k_CLK_HZ              32768u   /* Value of the external 32k crystal or oscillator clock frequency in Hz */
    #define CPU_INT_SLOW_CLK_HZ             32768u   /* Value of the slow internal oscillator clock frequency in Hz  */
    #define CPU_INT_FAST_CLK_HZ             4000000u /* Value of the fast internal oscillator clock frequency in Hz  */
    #define DEFAULT_SYSTEM_CLOCK            48000000u /* Default System clock value */
#elif (CLOCK_SETUP == 2)
    #define CPU_XTAL_CLK_HZ                 8000000u /* Value of the external crystal or oscillator clock frequency in Hz */
    #define CPU_XTAL32k_CLK_HZ              32768u   /* Value of the external 32k crystal or oscillator clock frequency in Hz */
    #define CPU_INT_SLOW_CLK_HZ             32768u   /* Value of the slow internal oscillator clock frequency in Hz  */
    #define CPU_INT_FAST_CLK_HZ             4000000u /* Value of the fast internal oscillator clock frequency in Hz  */
    #define DEFAULT_SYSTEM_CLOCK            8000000u /* Default System clock value */
#endif /* (CLOCK_SETUP == 2) */

/* ----------------------------------------------------------------------------
   -- Core clock
   ---------------------------------------------------------------------------- */
uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
/* ----------------------------------------------------------------------------
   -- SystemInit()
   ---------------------------------------------------------------------------- */
void SystemInit (void) {
/* Switch to FBE Mode */
  /* OSC->CR: ERCLKEN=0,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
  OSC0->CR = (uint8_t)0x00u;
  /* SIM->SOPT2: MCGCLKSEL=0 */
  SIM->SOPT2 &= (uint8_t)~(uint8_t)0x01u;
  /* MCG->C2: ??=0,??=0,RANGE=2,HGO=0,EREFS=1,LP=0,IRCS=0 */
  MCG->C2 = (uint8_t)0x24u;
  /* MCG->C1: CLKS=2,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
  MCG->C1 = (uint8_t)0x9Au;
  /* MCG->C4: DMX32=0,DRST_DRS=0 */
  MCG->C4 &= (uint8_t)~(uint8_t)0xE0u;
  /* MCG->C5: ??=0,PLLCLKEN=0,PLLSTEN=0,PRDIV=3 */
  MCG->C5 = (uint8_t)0x03u;
  /* MCG->C5: PLLCLKEN=1 */
  MCG->C5 |= (uint8_t)0x40u;            /* Enable the PLL */
  /* MCG->C6: LOLIE=0,PLLS=0,CME=0,VDIV=0 */
  MCG->C6 = (uint8_t)0x00u;
  while((MCG->S & MCG_S_OSCINIT0_MASK) == 0u) { /* Check that the oscillator is running */总是卡住这里，请问指导！
  }
  while((MCG->S & MCG_S_IREFST_MASK) != 0u) { /* Check that the source of the FLL reference clock is the external reference clock. */
  }
  while((MCG->S & 0x0Cu) != 0x08u) {    /* Wait until external reference clock is selected as MCG output */
  }
  /* Switch to PBE Mode */
  /* MCG->C1: CLKS=2,FRDIV=0,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
  MCG->C1 = (uint8_t)0x82u;
  /* MCG->C6: LOLIE=0,PLLS=1,CME=0,VDIV=0 */
  MCG->C6 = (uint8_t)0x40u;
  /* Switch to PEE Mode */
  /* MCG->C1: CLKS=0,FRDIV=0,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
  MCG->C1 = (uint8_t)0x02u;
  /* MCG->C5: ??=0,PLLCLKEN=0,PLLSTEN=0,PRDIV=3 */
  MCG->C5 = (uint8_t)0x03u;
  /* MCG->C6: LOLIE=0,PLLS=1,CME=0,VDIV=0 */
  MCG->C6 = (uint8_t)0x40u;
  while((MCG->S & 0x0Cu) != 0x0Cu) {    /* Wait until output of the PLL is selected */
  }
  while((MCG->S & MCG_S_LOCK_MASK) == 0u) { /* Wait until locked */
  }
  /* SIM->CLKDIV1: OUTDIV1=0,OUTDIV2=0,OUTDIV3=1,OUTDIV4=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
  SIM->CLKDIV1 = (uint32_t)0x00110000u; /* Update system prescalers */
}

我知道答案 目前已有0人回答

阅读全文

小成说事

你看一下CLOCK_SETUP 是值是多少。