LAUNCHXL-F28379D: 系统时钟频率比理论的200MHZ少了一半

futian jishu 说：

也就是说我的板子此时系统频率是100MHZ，比手册上说的200MHZ少了一半。

您是想设置200MHz的系统时钟？在例程内有如下定义，默认的系统时钟就是200MHz的系统时钟

您是如何测量的系统时钟呢？

//
// 200MHz SYSCLK frequency based on the above DEVICE_SETCLOCK_CFG. Update the
// code below if a different clock configuration is used!
//
#define DEVICE_SYSCLK_FREQ          ((DEVICE_OSCSRC_FREQ * 40 * 1) / 2) 

您可以使用下面的函数来获取系统频率

//*****************************************************************************
//
//! Calculates the system clock frequency (SYSCLK).
//!
//! \param clockInHz is the frequency of the oscillator clock source (OSCCLK).
//!
//! This function determines the frequency of the system clock based on the
//! frequency of the oscillator clock source (from \e clockInHz) and the PLL
//! and clock divider configuration registers.
//!
//! \return Returns the system clock frequency. If a missing clock is detected,
//! the function will return the INTOSC1 frequency. This needs to be
//! corrected and cleared (see SysCtl_resetMCD()) before trying to call this
//! function again.
//
//*****************************************************************************
extern uint32_t
SysCtl_getClock(uint32_t clockInHz);

好的，感谢您的耐心回答，谢谢！