如何使用CysB.DLL的基于C++的应用程序访问HID设备的应用

USPFSyStestAPI描述没有提到第二个参数的使用。该参数启用/禁用Vddd和D+线被拉到的电位之间的内部调节器。我们需要注意的是，第二个参数正确地反映了我们正在使用的VDDD电压来操作IC。假设如果你在VDDD＝5V下工作，但是你使用这个参数作为UsBuTARGE1 1V3VY操作，则将D+上拉电压调节到3.3V的内部调节器被禁用，它简单地将VDDD电压传递到D+上拉。因此，在这种情况下，当通过5dV到D+上拉时，它使D+被驱动到+4V。这是无效的，按照规范，输出高电压的范围是2.8～3.6V。在这种情况下，PC的USB端口可能无法与设备通信，而您将看到，如果使用在PC机之间的外部轮毂-设备能够通信。
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固件和应用程序CPP HID CysBydLL.Zip
9.4兆字节



     以下为原文
  The USBFS_Start API description does not mention about the use of the second argument. The argument enables / disables the internal regulator between Vddd and the potential to which the D+ line is pulled-up.
We need to take care that the second argument correctly relfects the Vddd voltage we are using to operate the IC.

Suppose if you are operating at Vddd = 5V but you use the argument as USBUART_1_3V_OPERATION, the internal regulator for regulating the D+ pull-up voltage to 3.3V is disabled and it simply passes the Vddd voltage to the D+ pull-up. So in this case, when you pass 5V over to the D+ pull-up, it made the D+ be driven to >4V. This is invalid as per the specification, the range for a output high voltage is 2.8-3.6V. In this case, the USB port of a PC might not communicate with the device, whereas you will see that if you use an external hub in between the PC - the device is able to communicate.
    Find the package attached.
     
    Cheers.!!!

•   Firmware and Application Cpp HID cyu***_dll.zip 9.4 MB