gpioa.c

来自「嵌入式系统mcf5272华恒光盘开发板附源代码gpio」· C语言 代码 · 共 33 行

#define MCF5272_GPIO_PACNT (0x0080)
#define MCF5272_GPIO_PADDR (0x0084)
#define MCF5272_GPIO_PADAT (0x0086)
#define MCF_MBAR 0x10000000


main()
{
	
	//configure port A pins,and determine the signal direction 
	*(volatile unsigned int*)(MCF_MBAR + MCF5272_GPIO_PACNT) = 0x00000000;
	*(volatile unsigned short*)(MCF_MBAR + MCF5272_GPIO_PADDR) = 0xff00;
	
	while(1)
	{

		//transmit data to GPIO port A9
		*(volatile unsigned short*)(MCF_MBAR + MCF5272_GPIO_PADAT) = 0x0100;
		usleep(300000);
		//transmit data to GPIO port A10
		*(volatile unsigned short*)(MCF_MBAR + MCF5272_GPIO_PADAT) = 0x0200;
		usleep(300000);
		//transmit data to GPIO port A11
		*(volatile unsigned short*)(MCF_MBAR + MCF5272_GPIO_PADAT) = 0x0400;
		usleep(300000);
		//transmit data to GPIO port A12
		*(volatile unsigned short*)(MCF_MBAR + MCF5272_GPIO_PADAT) = 0x0800;
		usleep(300000);
	}
			
	
}