buttonsample.c

linux下面 drv button 设计 定时器使用

/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
File Name:
	buttonsample.c
Abstract:
	demo program for using button bond/restore buttons(connected to gpg0/gpg2) driver
Author:
	Huiqing Guo
Revision History:
	2007.10		created
---------------------------------------------------------------------------*/
#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>

void bond_button_thread(void)
{
	int fileno;
	char readvalue;
	struct sched_param threadparam;
	int staticpriority;

	//NOTE:
	//In order to decrease the delay time,we should set this thread to be real-time thread.
	//And the static priority should be configured according to the real environment in which
	//this thread running.
	staticpriority = sched_get_priority_min(SCHED_FIFO);
	threadparam.__sched_priority = staticpriority;

	sched_setscheduler(0,SCHED_FIFO,&threadparam);

	fileno = open("/dev/btn_update",O_RDONLY);
	if (fileno == -1){
		printf("open device bondbutton error!\n");
		return ;
		}

	while(1){
		if(read(fileno, &readvalue,1)==-1){
			printf("read failure\n");
			close(fileno);
			return ;
			}
		
		if(readvalue=='1'){
			printf("bondbutton checked a short time button press!\n");
			}
		else{
			printf("bondbutton checked a long time button press!\n");
			}
		}

	close(fileno);

	return;
}

void restore_button_thread(void)
{
        int fileno;
        int readvalue;
        struct sched_param threadparam;
        int staticpriority;

        //NOTE:
        //In order to decrease the delay time,we should set this thread to be real-time thread.
        //And the static priority should be configured according to the real environment in which
        //this thread running.
        staticpriority = sched_get_priority_min(SCHED_FIFO);
        threadparam.__sched_priority = staticpriority;

        sched_setscheduler(0,SCHED_FIFO,&threadparam);

        fileno = open("/dev/btn_upload",O_RDONLY);
        if (fileno == -1){
                printf("open device bondbutton error!\n");
                return ;
                }

        while(1)
	 {
                if(read(fileno, &readvalue,1)==-1)
		  {
                        printf("read failure\n");
                        close(fileno);
                        return ;
                 }

                if(readvalue <= 100)
		  {
                        printf("restorebutton checked a short time button press!\n");
                }
                else
		   {
                        printf("restorebutton checked a long time button press!\n");
                  }
      	 }

        close(fileno);

        return;
}

int main(void)
{
	pthread_t threadid;

	pthread_create(&threadid,NULL,(void*)bond_button_thread,NULL);//create the dameon thread
        pthread_create(&threadid,NULL,(void*)restore_button_thread,NULL);//create the dameon thread

	pthread_join(threadid,NULL);//wait,until the dameon thread terminate
	return 0;
}