#include?
#include?
#include?
#include?

int?main（int?argc?char?**argv）
{
????int?i;
????int?ret;
????int?fd;
????int?press_cnt[4];
????
????fd?=?open（“/dev/buttons“?0）;??//?打開設備
????if?（fd?????????printf（“Can‘t?open?/dev/buttons\n“）;
????????return?-1;
????}

????//?這是個無限循環，進程有可能在read函數中休眠，當有按鍵被按下時，它才返回
????while?（1）?{
????????//?讀出按鍵被按下的次數
????????ret?=?read（fd?press_cnt?sizeof（press_cnt））;
????????if?（ret?????????????printf（“read?err!\n“）;
????????????continue;
????????}?

????????for?（i?=?0;?i?????????????//?如果被按下的次數不為0，打印出來
????????????if?（press_cnt[i]）
????????????????printf（“K%d?has?been?pressed?%d?times!\n“?i+1?press_cnt[i]）;
????????}
????}
????
????close（fd）;
????return?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????872??2008-01-23?03:33??drivers_and_test\buttons\button_test.c

?????文件????????137??2008-01-23?03:33??drivers_and_test\buttons\Makefile

?????文件???????4842??2008-01-23?03:33??drivers_and_test\buttons\s3c24xx_buttons.c

?????目錄??????????0??2009-08-13?14:15??drivers_and_test\buttons

?????文件??????20706??2008-01-23?03:33??drivers_and_test\fb_test\fb.h

?????文件??????11827??2008-01-23?03:33??drivers_and_test\fb_test\fb_test.c

?????文件?????????81??2008-01-23?03:33??drivers_and_test\fb_test\Makefile

?????目錄??????????0??2009-08-13?14:15??drivers_and_test\fb_test

?????文件?????585928??2009-07-28?21:30??drivers_and_test\leds\led_test

?????文件????????989??2008-01-23?03:33??drivers_and_test\leds\led_test.c

?????文件????????122??2008-01-23?03:33??drivers_and_test\leds\Makefile

?????文件???????3266??2008-01-23?03:33??drivers_and_test\leds\s3c24xx_leds.c

?????目錄??????????0??2009-08-13?14:15??drivers_and_test\leds

?????文件????????127??2008-01-23?03:33??drivers_and_test\regeditor\Makefile

?????文件???????8340??2008-01-23?03:33??drivers_and_test\regeditor\regeditor.c

?????目錄??????????0??2009-08-13?14:15??drivers_and_test\regeditor

?????目錄??????????0??2009-08-13?14:15??drivers_and_test

-----------?---------??----------?-----??----

???????????????637237????????????????????17