DualShock 4 driver test using C

hidraw_test.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

int main(int argc, char **argv) {
    if (argc != 2) {
        printf("Usage: %s hidraw_device\n", argv[0]);
        return 0;
    }

    int fd = open(argv[1], O_RDWR);
    if (fd < 0) {
        perror("Unable to open device");
        return 1;
    }

    char buf[78];
    memset(buf, 0x0, sizeof(buf));

    buf[0] = 0x11;
    buf[1] = 128;
    buf[3] = 255;

    // Rumble
    buf[6] = 0;
    buf[7] = 0;

    // LED (red, green, blue)
    buf[8] = 0;
    buf[9] = 0;
    buf[10] = 255;

    // Time to flash bright (255 = 2.5 seconds)
    buf[11] = 0;

    // Time to flash dark (255 = 2.5 seconds)
    buf[12] = 0;

    int res;

    res = write(fd, buf, 78);
    if (res < 0) {
        perror("Unable to send report");
        return 1;
    }

    for (;;) {
        res = read(fd, buf, 78);
        if (res < 0) {
            perror("Unable to read report");
            return 1;
        }

        for (int i = 0; i < res; ++i) {
            printf("%2hhx ", buf[i]);
        }

        puts("\n");
    }

    close(fd);

    return 0;
}