GPIO23低电平点亮

周期性改变GPIO23电平，使得LED闪烁

void main(void)

{

InitSysCtrl(); //初始化系统时钟

InitGpio(); //初始化 GPI0

EALLOW; //允许保护

GpioCtrlRegs.GPAMUX2.bit.GPI023=0; //将GP1023设置为GPIO

GpioCtrlRegs.GPADIR.bit.GPI023=1; //将GP1023设置为输出引脚

EDIS;

DINT; //Clear all interrupts and initialize PIE vector table 禁止CPU的所有中断

InitPieCtrl(); //Initialize the PIE control registers to their default state初始化中断控制寄存器

IER = 0x0000; //Disable Cpu interrupts and clear all CPU interrupt flags 禁止CPU中断

IFR =0x0800; //清除所有CPU的中断标志位

InitPieVectTable(); //Initialize the PIE vector table with pointers to the shell Interrup't Service Routines (ISR).

EINT; //打开CPU的全局中断使能

for(;;)

{

GpioDataRegs.GPACLEAR.bit.GPI023=1; // GPI023输出低电平，灯亮

DELAY_US(500000L); //延时500000微秒=0.5秒

GpioDataRegs.GPASET.bit.GPI023=1; // GPI023输出高电平，灯不亮

DELAY_US(500000L);

}

}