Windows 7无法通过USB识别PIC24FJGB002

嗨，我修改了“USB设备HydSuth固件Exp16PoPIC24FJ64 GBB44PIP.x”，对于PIC24FJGBB2，当试图通过USB快速连接MCU时，我得到了“未知设备”的错误。MPLAB驱动程序用于Windows已经安装Windows 7并用于PIC18F2550。我有10UF TANTALCAP FAVUSB引脚（23），并连接到GND。Vbus pin是不连接的。不使用USB VCC和GND PINSI只使用+，D-我配置寄存器如下：我尝试MCU与LED闪烁的周期为200毫秒，秒。成功地编程和工作。我使用8MHz晶体，期望得到32 MHz振荡器FRQ使用16MHz进行正常操作，但我没有实现使它通过USB连接到PC，可能会产生什么问题？谢谢帮助



      以下为原文

    Hi,

I modified "u***devicehid_customfirmwareexp16_pic24fj64gb004_pim.x" for PIC24FJGB002 and I am getting "unknown device" error when trying to connect MCU via USB Fast Speed. MPLAB driver for windows already installed on Windows 7 and used to work for PIC18F2550.

I have 10uF tantal cap for Vu*** pin (23) and connected to GND.
Vbus pin is unconnected
I don't use USB Vcc and GND pins
I only use D+,D-

My config registers as follows:

/** CONFIGURATION Bits **********************************************/
// CONFIG4
#pragma config DSWDTPS = DSWDTPS3 // DSWDT Postscale Select (1:128 (132 ms))
#pragma config DSWDTOSC = LPRC // Deep Sleep Watchdog Timer Oscillator Select (DSWDT uses Low Power RC Oscillator (LPRC))
#pragma config RTCOSC = SOSC // RTCC Reference Oscillator Select (RTCC uses Secondary Oscillator (SOSC))
#pragma config DSBOREN = OFF // Deep Sleep BOR Enable bit (BOR disabled in Deep Sleep)
#pragma config DSWDTEN = OFF // Deep Sleep Watchdog Timer (DSWDT disabled)

// CONFIG3
#pragma config WPFP = WPFP0 // Write Protection Flash Page Segment Boundary (Page 0 (0x0))
#pragma config SOSCSEL = SOSC // Secondary Oscillator Pin Mode Select (SOSC pins in Default (high drive-strength) Oscillator Mode)
#pragma config WUTSEL = LEG // Voltage Regulator Wake-up Time Select (Default regulator start-up time used)
#pragma config WPDIS = WPDIS // Segment Write Protection Disable (Segmented code protection disabled)
#pragma config WPCFG = WPCFGDIS // Write Protect Configuration Page Select (Last page and Flash Configuration words are unprotected)
#pragma config WPEND = WPENDMEM // Segment Write Protection End Page Select (Write Protect from WPFP to the last page of memory)

// CONFIG2
#pragma config POSCMOD = HS // Primary Oscillator Select (HS Oscillator mode selected)
#pragma config I2C1SEL = PRI // I2C1 Pin Select bit (Use default SCL1/SDA1 pins for I2C1 )
#pragma config IOL1WAY = OFF // IOLOCK One-Way Set Enable (The IOLOCK bit can be set and cleared using the unlock sequence)
#pragma config OSCIOFNC = ON // OSCO Pin Configuration (OSCO pin functions as port I/O (RA3))
#pragma config FCKSM = CSDCMD // Clock Switching and Fail-Safe Clock Monitor (Sw Disabled, Mon Disabled)
#pragma config FNOSC = PRIPLL // Initial Oscillator Select (Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL))
#pragma config PLL96MHZ = ON // 96MHz PLL Startup Select (96 MHz PLL Startup is enabled automatically on start-up)
#pragma config PLLDIV = DIV2 // USB 96 MHz PLL Prescaler Select (Oscillator input divided by 2 (8 MHz input))
#pragma config IESO = OFF // Internal External Switchover (IESO mode (Two-Speed Start-up) disabled)

// CONFIG1
#pragma config WDTPS = PS1 // Watchdog Timer Postscaler (1:1)
#pragma config FWPSA = PR32 // WDT Prescaler (Prescaler ratio of 1:32)
#pragma config WINDIS = OFF // Windowed WDT (Standard Watchdog Timer enabled,(Windowed-mode is disabled))
#pragma config FWDTEN = OFF // Watchdog Timer (Watchdog Timer is disabled)
#pragma config ICS = PGx1 // Emulator Pin Placement Select bits (Emulator functions are shared with PGEC1/PGED1)
#pragma config GWRP = OFF // General Segment Write Protect (Writes to program memory are allowed)
#pragma config GCP = OFF // General Segment Code Protect (Code protection is disabled)
#pragma config JTAGEN = OFF // JTAG Port Enable (JTAG port is disabled)
#define _XTAL_FREQ 48000000

/*********************************************************************

I tried MCU with LED blinking with period of 200ms, successfully programmed and  worked.
I use 8MHz Crystal and
I expect to get 32MHz Oscillator freq to use 16MHz for normal operations  
But I did not achieve to get it connected via USB to PC,
what may cause such problem?
Please help

Thank you
Regards