switch.c

来自「fr-400 嵌入式系统板的 图形 api」· C语言 代码 · 共 55 行

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include "switch.h"
#include "sw_val.h"

static int swfd;

int sw_init()
{
	if((swfd = open("/dev/switch", O_RDWR)) >= 0)
		return swfd;
	else
		return -1;
}

int reset_sw()
{
	int sw_val;

	do {
		ioctl(swfd, FPGA_SW_READ, &sw_val);
	} while (!(sw_val == SW_OFF));
}

int chk_sw()
{
	int sw_val;

	reset_sw();

	do {
		ioctl(swfd, FPGA_SW_READ, &sw_val);
	} while (sw_val == SW_OFF);

	return(sw_val);
}

int chk_sw_now()
{
	int sw_val;

	ioctl(swfd, FPGA_SW_READ, &sw_val);
	return(sw_val);
}

int chk_led_now()
{
	int sw_val;
	ioctl(swfd,FPGA_SW_READ,&sw_val);	// to be checked!!!
	return(sw_val);
}