어선아

Client_motion.c

+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+
+#define IN  0
+#define OUT 1
+#define LOW  0
+#define HIGH 1
+#define MOTION 17
+#define SPEAKER 18
+#define BUFFER_MAX 3
+#define DIRECTION_MAX 1024
+#define VALUE_MAX 40
+
+static int GPIOExport(int pin) {
+    char buffer[BUFFER_MAX];
+    ssize_t bytes_written;
+    int fd;
+
+    // GPIO 핀을 사용하기 위해 /sys/class/gpio/export 파일에 핀 번호를 기록
+    fd = open("/sys/class/gpio/export", O_WRONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Failed to open export for writing!\n");
+        return -1;
+    }
+
+    bytes_written = snprintf(buffer, BUFFER_MAX, "%d", pin);
+    write(fd, buffer, bytes_written);
+    close(fd);
+    return 0;
+}
+
+static int GPIOUnexport(int pin) {
+    char buffer[BUFFER_MAX];
+    ssize_t bytes_written;
+    int fd;
+
+    // GPIO 핀을 사용하지 않기 위해 /sys/class/gpio/unexport 파일에 핀 번호를 기록
+    fd = open("/sys/class/gpio/unexport", O_WRONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Failed to open unexport for writing!\n");
+        return -1;
+    }
+
+    bytes_written = snprintf(buffer, BUFFER_MAX, "%d", pin);
+    write(fd, buffer, bytes_written);
+    close(fd);
+    return 0;
+}
+
+static int GPIODirection(int pin, int dir) {
+    static const char s_directions_str[] = "in\0out";
+
+    char path[DIRECTION_MAX];
+    //char path[DIRECTION_MAX] = "/sys/class/gpio/gpio%d/direction";
+    int fd;
+
+    // GPIO 핀을 입력으로 설정
+    snprintf(path, DIRECTION_MAX, "/sys/class/gpio/gpio%d/direction", pin);
+
+    fd = open(path, O_WRONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Failed to open gpio direction for writing!\n");
+        return -1;
+    }
+
+    if (-1 == write(fd, &s_directions_str[IN == dir ? 0 : 3], IN == dir ? 2 : 3)) {
+        fprintf(stderr, "Failed to set direction!\n");
+        close(fd);
+        return -1;
+    }
+
+    close(fd);
+    return 0;
+}
+
+static int GPIORead(int pin) {
+    char path[VALUE_MAX];
+    char value_str[3];
+    int fd;
+
+    // GPIO 핀의 값을 읽어옴
+    snprintf(path, VALUE_MAX, "/sys/class/gpio/gpio%d/value", pin);
+    fd = open(path, O_RDONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Failed to open unexport for writing!\n");
+        return -1;
+    }
+
+    if (-1 == read(fd, value_str, 3)) {
+        fprintf(stderr, "Failed to read value!\n");
+        close(fd);
+        return -1;
+    }
+
+    close(fd);
+
+    return(atoi(value_str));
+}
+
+static int GPIOWrite(int pin, int value) {
+    static const char s_values_str[] = "01";
+
+    char path[VALUE_MAX];
+    int fd;
+
+    snprintf(path,VALUE_MAX, "/sys/class/gpio/gpio%d/value", pin);
+    fd = open(path, O_WRONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Failed to open gpio value for writing!\n");
+        return -1;
+    }
+
+    if (1 != write(fd, &s_values_str[LOW == value ? 0 : 1], 1)) {
+        fprintf(stderr, "Failed to write value!\n");
+        close(fd);
+        return -1;
+    }
+    
+    close(fd);
+    return 0;
+}
+
+void playSound(int frequency, int time) {
+    // Period = 1초 / Frequency
+    int period = 1000000 / frequency;
+    // 75% Duty Cycle 계산
+    int dutycycle = period * 0.75;
+    // 사운드 출력 횟수 (사운드를 지속할 시간을 위한 계산)
+    int num = (frequency * time) / 1000000;
+
+    for (int i = 0; i < num; i++) {
+        GPIOWrite(SPEAKER, 1);
+        usleep(dutycycle);
+        GPIOWrite(SPEAKER, 0);
+        usleep(period - dutycycle);
+    }
+}
+
+void error_handling(char *message){
+    fputs(message,stderr);
+    fputc('\n',stderr);
+    exit(1);
+}
+
+int main(int argc, char *argv[]) {
+    int sock;
+    struct sockaddr_in serv_addr;
+    char msg[2];
+    char on[2]="1";
+    int str_len;
+
+    int detected;
+    
+    if(argc!=3){
+        printf("Usage : %s <IP> <port>\n",argv[0]);
+        exit(1);
+    }
+
+     // Enable GPIO pins
+    if (GPIOExport(SPEAKER) == -1)
+        return 1;
+
+    // Set GPIO directions
+    if (GPIODirection(SPEAKER, OUT) == -1)
+        return 2;
+    
+    sock = socket(PF_INET, SOCK_STREAM, 0);
+    if(sock == -1)
+        error_handling("socket() error");
+    
+    memset(&serv_addr, 0, sizeof(serv_addr));
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
+    serv_addr.sin_port = htons(atoi(argv[2]));
+    
+    if(connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)
+        error_handling("connect() error");
+
+    while(1){
+        str_len = read(sock, msg, sizeof(msg));
+        if(str_len == -1)
+            error_handling("read() error");
+            
+        printf("Receive message from Server : %s\n",msg);
+
+        if(strncmp(on,msg,1)==0) {
+            if (GPIORead(MOTION) == 1) {
+                detected = 1;
+                printf("Motion detected\n");
+                snprintf(msg, 2, "%d", detected);
+                write(sock, msg, sizeof(msg));
+                printf("msg = %s\n", msg);
+            } else {
+                detected = 0;
+                printf("Nothing\n");
+                playSound(1000,1000000);    // 1000Hz, 1sec(1000000ms)
+                snprintf(msg, 2, "%d", detected);
+                write(sock, msg, sizeof(msg));
+                printf("msg = %s\n", msg);
+            }
+        } else {
+            write(sock, msg, sizeof(msg));
+            printf("msg = %s\n", msg);
+        }
+    }
+    close(sock);
+
+    while(1)
+    
+    //Disable GPIO pins
+    if (GPIOUnexport(SPEAKER) == -1)
+        return 3;
+
+    return(0);
+}
+