用这个可以发  电脑能识别

      hidEmuSendConsumerReport(0xea, 0);

      hidEmuSendConsumerReport(0, 0);

怎么直接用

    HidDev_Report(HID_RPT_ID_CONSUMER_IN, HID_REPORT_TYPE_INPUT,

                  HID_CONSUMER_IN_RPT_LEN, buf);

直接发  

  这样是能用了  

        uint8_t buf[HID_CONSUMER_IN_RPT_LEN];

        buf[0] = KEY_CONSUMER_VOLUME_UP;   // volume up
        buf[1] = 0; // volume dowm

        HidDev_Report(HID_RPT_ID_CONSUMER_IN, HID_REPORT_TYPE_INPUT,HID_CONSUMER_IN_RPT_LEN, buf);
        HidDev_Report(HID_RPT_ID_CONSUMER_IN, HID_REPORT_TYPE_INPUT,HID_CONSUMER_IN_RPT_LEN, 0);