Update ds18b20 and move ds18b20 and sht20 into modules folder

guowenxue

2018-10-14 0007a0beea36408539e623d742787c38c03b5c80

Update ds18b20 and move ds18b20 and sht20 into modules folder

 program/ds18b20/ds18b20.c

File was deleted

 program/modules/ds18b20/ds18b20.c

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@@ -0,0 +1,119 @@
/*********************************************************************************
 *      Copyright:  (C) 2018 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  ds18b20.c
 *    Description:  This file 
 *                 
 *        Version:  1.0.0(2018/10/14)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "2018/10/14 12:13:26"
 *                 
 ********************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <time.h>
#include <errno.h>

int ds18b20_get_temperature(float *temp);

int main(int argc, char *argv[])
{
        float       temp;

        if( ds18b20_get_temperature(&temp) < 0 )
        {
                printf("ERROR: ds18b20 get temprature failure\n");
                return 1;
        }

        printf("DS19B20 get temperature: %f ℃\n", temp);
        return 0;
}


/* File Content:
   pi@raspberrypi:~/guowenxue $ cat /sys/bus/w1/devices/28-041731f7c0ff/w1_slave 
   3a 01 4b 46 7f ff 0c 10 a5 : crc=a5 YES
   3a 01 4b 46 7f ff 0c 10 a5 t=19625
 */

int ds18b20_get_temperature(float *temp)
{
    char            w1_path[50] = "/sys/bus/w1/devices/";
    char            chip[20];
    char            buf[128];
    DIR            *dirp;
    struct dirent  *direntp;
    int             fd =-1;
    char           *ptr;
    float           value;
    int             found = 0;

    if( !temp )
    {
            return -1;
    }

    /*+-------------------------------------------------------------------+
     *|  open dierectory /sys/bus/w1/devices to get chipset Serial Number |
     *+-------------------------------------------------------------------+*/
    if((dirp = opendir(w1_path)) == NULL)
    {
        printf("opendir error: %s\n", strerror(errno));
        return -2;
    }

    while((direntp = readdir(dirp)) != NULL)
    {
        if(strstr(direntp->d_name,"28-"))
        {
            /* find and get the chipset SN filename */
            strcpy(chip,direntp->d_name);
            found = 1;
        }
    }
    closedir(dirp);

    if( !found )
    {
            printf("Can not find ds18b20 in %s\n", w1_path);
            return -3;
    }

    /* get DS18B20 sample file full path: /sys/bus/w1/devices/28-xxxx/w1_slave */
    strncat(w1_path, chip, sizeof(w1_path)-strlen(w1_path));
    strncat(w1_path, "/w1_slave", sizeof(w1_path)-strlen(w1_path));

    /* open file /sys/bus/w1/devices/28-xxxx/w1_slave to get temperature */
    if( (fd=open(w1_path, O_RDONLY)) < 0 ) 
    { 
            printf("open %s error: %s\n", w1_path, strerror(errno)); 
            return -4;
    } 
    
    if(read(fd, buf, sizeof(buf)) < 0)
    {
            printf("read %s error: %s\n", w1_path, strerror(errno)); 
            return -5;
    } 
    
    ptr = strstr(buf, "t=");
    if( !ptr )
    {
            printf("ERROR: Can not get temperature\n");
            return -6;
    }

    ptr+=2;

    /* convert string value to float value */
    *temp = atof(ptr)/1000;
   
    return 0;
}

 program/modules/ds18b20/ds18b20.py

 program/modules/ds18b20/makefile

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@@ -0,0 +1,11 @@
INST_PATH=/usr/bin
BIN_NAME=ds18b20

all: 
    gcc ds18b20.c -o ${BIN_NAME}

clean: 
    rm -f ${BIN_NAME}

install: 
    @cp ${BIN_NAME} ${INST_PATH}

 program/modules/sht20/sht20.c

 program/modules/sht20/sht20.py