SmartPDCode/pro/ui/gpio.c

#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include "gpio.h"
#include "elog.h"


#if 1
    #define LOGD  log_d
    #define LOGE  log_e
#else
    #define LOGD  printf
    #define LOGE  printf
#endif


int gpio_init(int gpio, int io)
{
    int r,fd;
    char tmp[20],path[100];
    
    sprintf(path,"/sys/class/gpio/export");
    fd = open(path, O_WRONLY);
	if(fd< 0){
		return -1;
	}
	sprintf(tmp, "%d", gpio);
    write(fd, tmp, strlen(tmp));
    close(fd);
    
    sprintf(path,"/sys/class/gpio/gpio%d/direction", gpio);
	fd = open(path, O_WRONLY);
	if(fd< 0){
		LOGE("open %s error\n", path);
		return -1;
	}
	
    if(io==GPIO_IN) {
	    sprintf(tmp, "in");
    }
    else {
        sprintf(tmp, "out");
    }
	r = write(fd, tmp, strlen(tmp));
	if(r<0){
	    LOGE("write gpio direction failed\n");
		return -1;
    }
    close(fd);
    
    sprintf(path,"/sys/class/gpio/gpio%d/value", gpio);
	fd = open(path, O_WRONLY);
	if(fd< 0){
		LOGE("open gpio value failed\n");
		return -1;
	}
    
    return fd;
}

int gpio_deinit(int fd)
{
    close(fd);
    return 0;
}

int gpio_set(int fd, int hl)
{
    int r;
    char tmp[20];
	
	sprintf(tmp, "%d", hl);
	r = write(fd, tmp, strlen(tmp));
	if(r<0){
		LOGE("gpio_set failed\n");
		return -1;
    }
	
	return 0;
}


int gpio_get(int fd)
{
    int r;
    char tmp[20];
    
    r = read(fd, tmp, sizeof(tmp)-1);  
    if (r<0) {  
        return -1;  
    }    
    
    if (tmp[0]=='0'){
        return 1;
    } else{
        return 0;
    }  
}