Re: [usb] USB Amateur desperately looking for help

[bhpchan@engmail.uwaterloo.ca]

Thanks for your replies, Vikas.  This is what I'm thinking right now.  

I'm thinking that I'll get a USB board, which basically has a basic 
connector to one side and USB connector on another.  

I'm planning to create my own IO board which consists of a couple of 
ADCs, and the output of the ADCs and the enable lines are connected 
through the connector on the USB board.  By writing firmware on the 
microcontroller on the USB board i'll enable and disable the ADC's to get 
the data I want.

This is where I'm stuck.  Do you think this idea is feasible?  I'm looking 
at the devasys.com webpage about the I2CIO board.  

I'm wondering if i have to write a driver still.  Also, I'm wondering if what 
I'm perceiving from the operation of this board is true.  Can you please 
give me some assistance?  Thank you very very much.

Bobby

----- Original Message ----- 
From: "Vikas T Rao " <vikasraot@m... > 
To: <usb@o... > 
Date: Sat, 02 Nov 2002 09:59:38 +0530 
Subject: Re: [usb] USB Amateur desperately looking for help 

> 
> 
> ** Proprietary ** 
> 
> hi, 
> 
> USBDCs(USB Device controllers) are the chips which will convert 
> user interface data to USB data and vice-versa. probably what you 
> are mentioning might also have an USBDC within that board. 
> 
> windows generic drivers might be sufficient for you if your data is 
> compatible. else you may have to wirte your own driver. 
> 
> ...vikas. 
> 
> >>> bhpchan@e...  11/02/02 06:00AM 
> >>> 
> 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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