main.c

来自「ARM开发例程,KEIL_ARM编译环境.」· C语言 代码 · 共 59 行

/************************************************************/
/* PROJECT NAME: GPIO	                                    */
/* Project:      LPC2100 Training course                    */
/* Engineer:     T Martin        [e-mail]        */
/* Filename:     main.c                                     */
/* Language:     C                      	                */
/* Compiler:     Keil ARM	V2.0b		                    */
/* Assembler:    				                            */
/*                                                          */
/************************************************************/
/* COPYRIGHT: Hitex UK Ltd 		2005  						*/
/* LICENSE:   THIS VERSION CREATED FOR FREE DISTRIBUTION	*/
/************************************************************/
/* Function:                                                */
/*                                                          */
/* Example 									           		*/
/*															*/
/* Demonstrates Use of the LPC2100 GPIO						*/
/*															*/	
/* Oscillator frequency 12.000 Mhz							*/
/* Target board Keil MCB21000								*/
/************************************************************/

#include <LPC21xx.H> 

void ChangeGPIOPinState(unsigned int state);


int main(void)
{
	unsigned int delay;
	unsigned int flasher = 0x00010000; 						// define locals

	IODIR1 				 = 0x00FF0000; 						// set all ports to output

	while(1)
	{

		for(delay = 0;delay<0xA0000;delay++)				//simple delay loop
		{
			;
		}

		ChangeGPIOPinState(flasher);						//set the state of the ports
		flasher = flasher << 1;								//shift the active led
		if(flasher & 0x01000000) 
		flasher = 0x00010000;								//Increment flasher led and test for overflow

	}
}

void ChangeGPIOPinState(unsigned int state)
{
	IOCLR1 	= ~state;  										//clear output pins
	IOSET1  =  state;										//set output pins	
}