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 "hidapi.h"

// Headers needed for sleeping.
#ifdef _WIN32
        #include <windows.h>
#else
        #include <unistd.h>
#endif

int main(int argc, char* 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, L"12345");
        handle = hid_open(0x4d8, 0x3f, NULL);
        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 shoud 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;
}