战舰时钟配置问题

Scy · 发表于 2014-3-31 16:44:47

void Stm32_Clock_HSE_72M_Init()
{
(*((unsigned long *)(0x40021000)))|=0x00010000;         //HSE ON
while(!*((unsigned long *)(0x40021000))&((unsigned long)1<<17));          //等待HSE就绪
(*((unsigned long *)(0x40021000+0x04)))|=0x001d0080;       //PLLXTPRE=0，PLLSRC=1,PLLMUL=0111,HPRE=1000
(*((unsigned long *)(0x40021000)))|=0x01000000;      //使能PLL
while(!*((unsigned long *)(0x40021000))>>25);         //等待PLL锁定
(*((unsigned long *)(0x40021000+0x04)))|=0x00000002;     //PLL作为系统时钟,SW=10
}

void delay()
{
unsigned long i=1000000;
while(i--);
}

int main(void)
{
Stm32_Clock_HSE_72M_Init();

*((unsigned long *)(0x40021000+0x18))=1<<3; //APB2 GPIOB使能

*((unsigned long *)(0x40010c00))=0x00100000;    //PB5   LED 0


while(1)
{
  *((unsigned long *)(0x40010c00+0x0c))=0x0000;    //PB5   0
  delay();

*((unsigned long *)(0x40010c00+0x0c))=0x0020; //PB5 1
delay();
}
}

这是我通过操作寄存器来配置外部8m时钟经过PLL倍频后作为系统时钟，同学通过修改分频倍频系数发现，超过4X13（HSE二分频后13倍频）以后程序就跑飞了，有没有人可以解答一下？
我看了战舰带的库函数程序里面，好像对FLASH进行了操作，是不是因为初始化时钟的时候闪存没有跟上导致程序跑飞了？