USB HID Host PICkit Bridge - PIC32MX

1(OK). Check Configuration Words for CPU/Peripheral System Frequency 48MHz in HardwareProfile.h
     Osc: 20 MHz
     try 48MHz first, if not stable, try 40MHz...(TCHIP-USB-MX250F128B is 40MHz)

2(OK). Check Baud Rate: 38400 first, then 921600. in HardwareProfile.h
    #define BAUDRATE2       38400UL //57600UL
    #define BRG_DIV2        4
    #define BRGH2           1

3(OK). Modify usbTPL[] in usb_config.c,  in usb_config.h
   #define NUM_TPL_ENTRIES 1

4(OK). usb_host_local.h
#define USB_SOF_THRESHOLD_64                0x5A    //0x4A will cause frame error

5. change io_mapping

    in HardwareProfile.h

    

6(OK). modify timer in InitializeTimer()

7. Test Timer/SYSCLK setup  Blink LED

8. ERRATA Don't turn cache and ... on due to Double Write on Peripheral
    Implement DMA (done)

9. Latency of the HC-06 bluetooth module is about 40ms.  The latency of a regulator PIC18F2550 USB Serial COM Port is about 1.4ms.

10. Implement Circular Buffer (Queue) for Commands.  It can only improve the regular write command, but not read command due to the latency of the bluetooth module.

================
modify usb_config.h usb_config.c
modify usb_host_local.h