hidtest.cpp

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/*******************************************************
 Windows HID simplification
 
 Alan Ott
 Signal 11 Software
 
 8/22/2009
 
 Copyright 2009
 
 This contents of this file may be used by anyone
 for any reason without any conditions and may be
 used as a starting point for your own applications
 which use HIDAPI.
********************************************************/
 
#include <stdio.h>
#include <wchar.h>
#include <string.h>
#include <stdlib.h>
#include "indi_hidapi.h"
 
// Headers needed for sleeping.
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif
 
int main(int argc, char* argv[])
{
    (void)argc;
    (void)argv;
    int res;
    unsigned char buf[256];
#define MAX_STR 255
    wchar_t wstr[MAX_STR];
    hid_device *handle;
    int i;
 
#ifdef _WIN32
    UNREFERENCED_PARAMETER(argc);
    UNREFERENCED_PARAMETER(argv);
#endif
 
    struct hid_device_info *devs, *cur_dev;
 
    if (hid_init())
        return -1;
 
    devs = hid_enumerate(0x0, 0x0);
    cur_dev = devs;
    while (cur_dev)
    {
        printf("Device Found\n  type: %04hx %04hx\n  path: %s\n  serial_number: %ls", cur_dev->vendor_id, cur_dev->product_id,
               cur_dev->path, cur_dev->serial_number);
        printf("\n");
        printf("  Manufacturer: %ls\n", cur_dev->manufacturer_string);
        printf("  Product:      %ls\n", cur_dev->product_string);
        printf("  Release:      %hx\n", cur_dev->release_number);
        printf("  Interface:    %d\n",  cur_dev->interface_number);
        printf("\n");
        cur_dev = cur_dev->next;
    }
    hid_free_enumeration(devs);
 
    // Set up the command buffer.
    memset(buf, 0x00, sizeof(buf));
    buf[0] = 0x01;
    buf[1] = 0x81;
 
 
    // Open the device using the VID, PID,
    // and optionally the Serial number.
    handle = hid_open(0x4d8, 0x3f, nullptr);
    if (!handle)
    {
        printf("unable to open device\n");
        return 1;
    }
 
    // Read the Manufacturer String
    wstr[0] = 0x0000;
    res = hid_get_manufacturer_string(handle, wstr, MAX_STR);
    if (res < 0)
        printf("Unable to read manufacturer string\n");
    printf("Manufacturer String: %ls\n", wstr);
 
    // Read the Product String
    wstr[0] = 0x0000;
    res = hid_get_product_string(handle, wstr, MAX_STR);
    if (res < 0)
        printf("Unable to read product string\n");
    printf("Product String: %ls\n", wstr);
 
    // Read the Serial Number String
    wstr[0] = 0x0000;
    res = hid_get_serial_number_string(handle, wstr, MAX_STR);
    if (res < 0)
        printf("Unable to read serial number string\n");
    printf("Serial Number String: (%d) %ls", wstr[0], wstr);
    printf("\n");
 
    // Read Indexed String 1
    wstr[0] = 0x0000;
    res = hid_get_indexed_string(handle, 1, wstr, MAX_STR);
    if (res < 0)
        printf("Unable to read indexed string 1\n");
    printf("Indexed String 1: %ls\n", wstr);
 
    // Set the hid_read() function to be non-blocking.
    hid_set_nonblocking(handle, 1);
 
    // Try to read from the device. There should be no
    // data here, but execution should not block.
    res = hid_read(handle, buf, 17);
 
    // Send a Feature Report to the device
    buf[0] = 0x2;
    buf[1] = 0xa0;
    buf[2] = 0x0a;
    buf[3] = 0x00;
    buf[4] = 0x00;
    res = hid_send_feature_report(handle, buf, 17);
    if (res < 0)
    {
        printf("Unable to send a feature report.\n");
    }
 
    memset(buf, 0, sizeof(buf));
 
    // Read a Feature Report from the device
    buf[0] = 0x2;
    res = hid_get_feature_report(handle, buf, sizeof(buf));
    if (res < 0)
    {
        printf("Unable to get a feature report.\n");
        printf("%ls", hid_error(handle));
    }
    else
    {
        // Print out the returned buffer.
        printf("Feature Report\n   ");
        for (i = 0; i < res; i++)
            printf("%02hhx ", buf[i]);
        printf("\n");
    }
 
    memset(buf, 0, sizeof(buf));
 
    // Toggle LED (cmd 0x80). The first byte is the report number (0x1).
    buf[0] = 0x1;
    buf[1] = 0x80;
    res = hid_write(handle, buf, 17);
    if (res < 0)
    {
        printf("Unable to write()\n");
        printf("Error: %ls\n", hid_error(handle));
    }
 
 
    // Request state (cmd 0x81). The first byte is the report number (0x1).
    buf[0] = 0x1;
    buf[1] = 0x81;
    hid_write(handle, buf, 17);
    if (res < 0)
        printf("Unable to write() (2)\n");
 
    // Read requested state. hid_read() has been set to be
    // non-blocking by the call to hid_set_nonblocking() above.
    // This loop demonstrates the non-blocking nature of hid_read().
    res = 0;
    while (res == 0)
    {
        res = hid_read(handle, buf, sizeof(buf));
        if (res == 0)
            printf("waiting...\n");
        if (res < 0)
            printf("Unable to read()\n");
#ifdef _WIN32
        Sleep(500);
#else
        usleep(500 * 1000);
#endif
    }
 
    printf("Data read:\n   ");
    // Print out the returned buffer.
    for (i = 0; i < res; i++)
        printf("%02hhx ", buf[i]);
    printf("\n");
 
    hid_close(handle);
 
    /* Free static HIDAPI objects. */
    hid_exit();
 
#ifdef _WIN32
    system("pause");
#endif
 
    return 0;
}