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当我使用宏定义来访问imx6ull的寄存器，控制GPIO5_IO3输出高低电平控制LED时，程序烧录进去后没有反应。但是当我使用指针来访问寄存器，LED可以正常驱动，请问这是什么原因？除了寄存器访问方式外，其余.s启动文件，.lds链接文件，Makefile文件完全相同。

1. 下面代码使用指针来配置寄存器，程序正常运行。

volatile unsigned int *CCM_CCGR1                              ;volatile unsigned int *IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3;volatile unsigned int *IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3;volatile unsigned int *GPIO5_GDIR                             ;volatile unsigned int *GPIO5_DR                               ;// #define CCM_CCGR1    									((volatile unsigned int*)0x020C406C)        //CCGR1// #define IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3      	((volatile unsigned int*)0x02290014)        //IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3// #define IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3   		((volatile unsigned int*)0x02290058)    // #define GPIO5_GDIR   									((volatile unsigned int*)0x020AC004)// #define GPIO5_DR     									((volatile unsigned int*)0x020AC000)void delay(volatile unsigned int d){	while(d--);
}int  main(){	unsigned int val;
	
	CCM_CCGR1                               = (volatile unsigned int *)(0x20C406C);
	IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 = (volatile unsigned int *)(0x2290014);
	IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3 = (volatile unsigned int *)(0x2290058);
	GPIO5_GDIR                              = (volatile unsigned int *)(0x020AC000 + 0x4);
	GPIO5_DR                                = (volatile unsigned int *)(0x020AC000);	/* GPIO5_IO03 */
	/* a. 使能GPIO5
	 * set CCM to enable GPIO5
	 * CCM_CCGR1[CG15] 0x20C406C
	 */
	*CCM_CCGR1 = 0xFFFFFFFF;	
	/* b. 设置GPIO5_IO03用于GPIO
	 * set IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3
	 *      to configure GPIO5_IO03 as GPIO
	 * IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3  0x2290014
	 * bit[3:0] = 0b0101 alt5
	 */
	val = 5;
	*IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 = val;
	*IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3 = 0x10b0;	
	/* c. 设置GPIO5_IO03作为output引脚
	 * set GPIO5_GDIR to configure GPIO5_IO03 as output
	 * GPIO5_GDIR  0x020AC000 + 0x4
	 * bit[3] = 0b1
	 */
	*GPIO5_GDIR = 0xFFFFFFFF;	while(1)
	{
		*GPIO5_DR = 0x00000000; //输出低电平，点亮LED
		delay(1000000);
		*GPIO5_DR = 0xFFFFFFFF; //输出高电平，关闭LED
		delay(1000000);
	}					
	return 0;
}

1. 下面代码使用宏定义配置寄存器，程序无反应。

/*
// volatile unsigned int *CCM_CCGR1                              ;
// volatile unsigned int *IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3;
// volatile unsigned int *IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3;
// volatile unsigned int *GPIO5_GDIR                             ;
// volatile unsigned int *GPIO5_DR                               ;
*/#define CCM_CCGR1 ((volatile unsigned int*)0x020C406C)        #define IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 ((volatile unsigned int*)0x02290014)        #define IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3 ((volatile unsigned int*)0x02290058)    #define GPIO5_GDIR ((volatile unsigned int*)0x020AC004)#define GPIO5_DR ((volatile unsigned int*)0x020AC000)void delay(volatile unsigned int d){	while(d--);
}int  main(){	unsigned int val;	
	// CCM_CCGR1                               = (volatile unsigned int *)(0x20C406C);
	// IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 = (volatile unsigned int *)(0x2290014);
	// IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3 = (volatile unsigned int *)(0x2290058);
	// GPIO5_GDIR                              = (volatile unsigned int *)(0x020AC000 + 0x4);
	// GPIO5_DR                                = (volatile unsigned int *)(0x020AC000);

	/* GPIO5_IO03 */
	/* a. 使能GPIO5
	 * set CCM to enable GPIO5
	 * CCM_CCGR1[CG15] 0x20C406C
	 * bit[31:30] = 0b11
	 */
	*CCM_CCGR1 = 0xFFFFFFFF;	
	/* b. 设置GPIO5_IO03用于GPIO
	 * set IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3
	 *      to configure GPIO5_IO03 as GPIO
	 * IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3  0x2290014
	 * bit[3:0] = 0b0101 alt5
	 */
	val = 5;
	*IOMUXC_SNVS_SW_MUX_CTL_PAD_SNVS_TAMPER3 = val;
	*IOMUXC_SNVS_SW_PAD_CTL_PAD_SNVS_TAMPER3 = 0x10b0;	
	/* c. 设置GPIO5_IO03作为output引脚
	 * set GPIO5_GDIR to configure GPIO5_IO03 as output
	 * GPIO5_GDIR  0x020AC000 + 0x4
	 * bit[3] = 0b1
	 */
	*GPIO5_GDIR = 0xFFFFFFFF;	while(1)
	{

		*GPIO5_DR = 0x00000000;//输出低电平，点亮LED
		delay(1000000);
		*GPIO5_DR = 0xFFFFFFFF;//输出高电平，熄灭LED
		delay(1000000);
	}					
	return 0;
}