文件列表:

usb源代码\USB.PAS (22635, 1999-01-25)
usb源代码\PCI.PAS (5102, 1999-01-25)
usb源代码\DUTILS.PAS (15079, 1998-10-02)
usb源代码\HUBDISCO.PAS (13189, 1999-01-25)
usb源代码 (0, 2008-07-13)

****************************************************************************** * * * U S B - Support for Turbo-Pascal * * * * * * (c) 19*** by Dieter R. Pawelczak * * * ****************************************************************************** For many embedded systems USB seems to be a good solution for data acquisition modules - as USB supports a frame rate of 1 ms which is fast enough for many feedback control applications. The problem now is that USB is currently only supported by Windows *** and updates of Windows 95. The design of the USB host controller again emphasizes the possibilities using USB in an embedded System: Once the USB communication is established, the host controller can work in the background using DMA-memory transfers - accompanied with a synchronous interrupt every millisecond, a real time feedback control system is easily established. For a simple motor velocity control I developped a microcontroller board with the USBN9602 controller by National Semiconductors. For a simple test environment I created some basic routines to access the USB host controller and did some experiments on the USB transfers. The following Turbo-Pascal units allow the initialization and the control of the USB host controller. As an example how to access and configure a USB device, I added the example program HUBDISCO, which enables and configures a 4-port HUB (using TUSB2040 from TI) and switches through its downstream ports. The example must be run in real mode environment as it needs the fact: physical address == linear address. These units have been created for testing purpose only and don't present a complete USB environment. It has been tested on several different main boards and processor types (Intel PIIX4,PIIX3). The units are created for Turbo-Pascal 7.0, but should run with some minor changes with Turbo-Pascal 6.0. The strange looking inline asm instructions are mainly 32 bit port access commands, which are not supported by Turbo Pascal. USB.PAS: basic USB routines PCI.PAS: access of PCI devices DUTILS.PAS: utility unit HUBDISCO.PAS: example program The units are based on the USB specification Version 1.1 and the Intel UHCI documentation. Literature USB-Spec., Version 1.1., see http://www.usb.org Intel UHCI, Intel PIIX4 documentation, see http://www.intel.com Dieter R. Pawelczak, January 1999 As I don't work on the USB-sector any longer, this is a final release of the units.

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