Re: [usb] USB Amateur desperately looking for help

[bhpchan@engmail.uwaterloo.ca]

Hi vikas,

Thanks for your input.  Well where can I find these USBDC's?  Are they 
those boards that have a USB connector on one side and serial 
connectors on the other with a USB chip in between?  These boards 
boast that I can send serial data to it and it'll convert it to USB signals.  

Do I have to write a driver for the USB?  or is Window's generic 
joystick/game controller driver good enough?

Bobby

----- Original Message ----- 
From: "Vikas T Rao " <vikasraot@m... > 
To: <usb@o... > 
Date: Fri, 01 Nov 2002 16:29:46 +0530 
Subject: Re: [usb] USB Amateur desperately looking for help 

> 
> 
> ** Proprietary ** 
> 
> hi, 
> 
> possibly your system(product - device) may look as described below. 
> 
> it's always better to choose a micro-controller(MC) to process 
> those sensory information because MC will have additional resources 
> than micro-processor. even u can make use of ADCs inbuilt in an MC. 
> so u have to choose proper MC having your necessary features(ADCs, 
> RAM, ROM etc). choosing an MC depends on what u want to process 
and 
> send (also speed matters). this probably u can only have a fair 
> idea to do so. 
> 
> after choosing an MC for processing the info, u have to choose an 
> appropriate USB device controller (USBDC) to send the data. MC will 
> send the info to this USBDC. USBDC will then convert this 
> info(ordinary data) into USB framed data. even USBDC has to take 
> the commands from the PC host and store those commands in it's 
> internal RAM. then USBDC should give an interrupt to MC. MC will 
> access the RAm of USBDC and process those commands and it will 
> write appropriate data to USBDC RAM. and MC should give 
acknowledge 
> to USBDC. USBDC will send that data to the the PC host upon getting 
> a request. 
> 
> now, firmware for the MC has to be written by you appropriately so 
> as the MC will function accordingly. USBDC may/may not have the 
> capability to do itself the bus enumeration (USB device 
> configuration) process.if it has then u have to program the USBDC 
> according to your needs. else you also have to write firmware for 
> the bus enumeration process to happen. in this firmware or 
> programming the USBDC itself, u have to specify how and what your 
> product will send the information (as you said it should be 
> recognised as game controller). 
> 
> so u have to select proper MC, USBDC and then you have to write 
> firmware for it. 
> 
> hope you have understood the data flow and the components and 
their 
> roles involved in your system. 
> 
> regards, 
> vikas. 
> 
> >>> bhpchan@e...  11/01/02 12:52PM 
> >>> 
> Hi, 
> 
> This is the system I'm planning to build. There are three sensors I 
> need 
> to monitor, and the sensor inputs goes through an ADC into a 
> processor 
> system. The processor system then has to (somehow) send 
information 
> to the USB port of my computer SO THAT my USB recognizes the 
inputs 
> as a game controller. 
> 
> How can I achieve that? Can anyone please help me expand 
> the "somehow" in between? I'm really lost. I've been looking at a 
> lot of 
> systems that boasts the capability to link "anything" to the USB 
> using 
> one of their pre-made cards that links serial to USB (or something 
> like 
> that). Can I use those? I really need desperate help. Also, if 
> anyone can 
> tell me exactly what I need for the processor system (processor, 
> RAM, 
> etc) it'll be great. I'll be building my own board for this 
> project. 
> 
> Thanks!! 
> 
> Bobby 
> 
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