代码:
#include <lm3s8962.h>
void Delay(void)
{
unsigned long Tmp = 0xFFFFFF;
while(--Tmp);
}
int main(void)
{
unsigned long RCC;
unsigned long RCC2;
RCC = SYSCTL_RCC_R;
RCC2 = SYSCTL_RCC2_R;
RCC |= SYSCTL_RCC_BYPASS;
RCC &= ~SYSCTL_RCC_USESYSDIV;
RCC2 |= SYSCTL_RCC2_BYPASS2;
SYSCTL_RCC_R = RCC;
SYSCTL_RCC2_R = RCC2;
RCC &= ~SYSCTL_RCC_MOSCDIS;
RCC |= SYSCTL_RCC_IOSCDIS;
SYSCTL_RCC_R = RCC;
Delay();
RCC |= SYSCTL_RCC_XTAL_8MHZ;
RCC |= SYSCTL_RCC_OSCSRC_MAIN;
RCC &= ~SYSCTL_RCC_PWRDN;
SYSCTL_RCC_R = RCC;
Delay();
RCC &= ~SYSCTL_RCC_SYSDIV_16;
RCC |= SYSCTL_RCC_SYSDIV_4;
RCC |= SYSCTL_RCC_USESYSDIV;
SYSCTL_RCC_R = RCC; //--------------运行了这句KEIL出错
while((SYSCTL_RIS_R & SYSCTL_RIS_PLLLRIS) == 0);
RCC &= ~SYSCTL_RCC_BYPASS;
RCC = SYSCTL_RCC_R;
SYSCTL_RCC_R = RCC;
while(1);
}
首先问题是这样:
无论用KEIL3或者KEIL4,运行完SYSCTL_RCC_R = RCC; 就会马上出错
另外,将Delay延长点也一样出错的。
板是8962 EV KIT,用8M主晶振,想倍频到50M
此帖出自
小平头技术问答
哦喔,传闻的延时处理。
看来还是用库方便点。
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