?? key.c
字號:
/*
* int0.c - int0 api & driver
*
* Author: li ming <admin@lumit.org>
* Date: 2008-4-16
* Copyleft: http://www.lumit.org
*/
#include "key.h"
/*
; hardware connection
; PIO8 (gpio)
; 1 (int0)
; so output value = 0x00000100 = (0b0000 0000 0000 0000 0000 0001 0000 0000)
*/
/* define the relative gpio register */
#define SYSCFG 0x03FF0000
#define IOPMOD (*((volatile unsigned *)(SYSCFG+0x5000)))
#define IOPDATA (*((volatile unsigned *)(SYSCFG+0x5008)))
/* set int0 related gpio */
int key_init(void)
{
// External interrupt 0 source number is 0
// set gpio's direction: set IOPMOD register mode bit to 0 = input
IOPMOD = IOPMOD & (~0x00000100);
return 0;
}
int key_is_down(void)
{
if(IOPDATA & (1 << 8))
return 1;
return 0;
}
int key_is_up(void)
{
if(IOPDATA & (1 << 8))
return 0;
return 1;
}
int status = 0;
int key_test(void)
{
key_init();
while(1)
{
status = key_is_up();
status = key_is_down();
}
return status;
}
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