系统时钟不是在你那个位置看的，是在这里，有好几个宏定义，你看你开启的是哪一个：
/* select a system clock by uncommenting the following line */
/* use IRC8M */
//#define __SYSTEM_CLOCK_IRC8M (uint32_t)(__IRC8M)
//#define __SYSTEM_CLOCK_48M_PLL_IRC8M (uint32_t)(48000000)
//#define __SYSTEM_CLOCK_72M_PLL_IRC8M (uint32_t)(72000000)
//#define __SYSTEM_CLOCK_108M_PLL_IRC8M (uint32_t)(108000000)
//#define __SYSTEM_CLOCK_120M_PLL_IRC8M (uint32_t)(120000000)
/* use HXTAL */
//#define __SYSTEM_CLOCK_HXTAL (uint32_t)(__HXTAL)
//#define __SYSTEM_CLOCK_24M_PLL_HXTAL (uint32_t)(24000000)
//#define __SYSTEM_CLOCK_36M_PLL_HXTAL (uint32_t)(36000000)
//#define __SYSTEM_CLOCK_48M_PLL_HXTAL (uint32_t)(48000000)
//#define __SYSTEM_CLOCK_56M_PLL_HXTAL (uint32_t)(56000000)
//#define __SYSTEM_CLOCK_72M_PLL_HXTAL (uint32_t)(72000000)
//#define __SYSTEM_CLOCK_96M_PLL_HXTAL (uint32_t)(96000000)
//#define __SYSTEM_CLOCK_108M_PLL_HXTAL (uint32_t)(108000000)
#define __SYSTEM_CLOCK_120M_PLL_HXTAL (uint32_t)(120000000)
如果你用的是外部晶振倍频到120M的，除了要把HXTAL_VALUE修改为8M，还需要修改system_clock_120m_hxtal这个函数，官方的用法是(25M/5)*12/5 = 12M，然后12M*10=120M，你可以修改成(8M/8)*12/8 = 12M，12M*10=120M | 
楼主
标题置顶
标题高亮
