I'm trying to write an usb cdc driver program. its cummunicate between pc and arduino due.actually my aim is reciveing the data form arduino and I read in visual c++ (command prompt).how to suppose i read the data in vc++. I don't the flow(sequence of the process) of cdc driver porgram . please explain me ?...........
You could look at HID application examples that Keil provides. Or it might be easier to communicate using RS232 program. Since there are several windows Visual C++ examples of that type of communication program.
I have decided to look into CDC programs also. So far it looks like ATMEL provides demos of ARM/AVR CDC programs. And PIC from Microchip has examples.
Found some code for PC and for a TI Board. processors.wiki.ti.com/.../USB_CDC_Benchmarking
I found out that the MCB2300 Board has a USBCDC program. Started looking at it. The way it looks is that the USBCDC is a virtual com port and requires a terminal program like teraterm to communicate with the port.
The test on the MCB2300 board uses two ports one is a uart port which is to pass characters to the Virtual com port it the uart receives characters. and the other way around.
I have not gotten it to work yet. Not sure about the actual baud rate of which UART Com port should be used.
Thank u for your continued support Mrs.Gary , Actually I have one doubt "Which one is easiest and most efficient way to create a USB CDC driver program , 'C++' or 'C#' ? "
Not really.
CDC is the USB Communications Device Class; Windows presents it (or part of it) to applications as a Virtual COM Port (VCP).
en.wikipedia.org/.../USB_communications_device_class
http://www.keil.com/pack/doc/mw/USB/html/_c_d_c.html
"requires a terminal program"
It doesn't specifically require a terminal program - though that's a good way to start experimenting
... 'C++' or 'C#' ?
Well, C# is a Microsoft language - only applicable to their .Net platforms.
So, presumably, this means that you're talking about the PC Host end - not the microcontroller end?
In which case, you don't need to create a Driver - because that is already provided by the Operating System.
Hi Andrew , still i'm confusing between USB CDC host and device program . Because i'm trying to send the ADC data from MCU(Arduino due) to pc . So i'm choosing USB CDC host program. because my MCU has a host.....so my question Why can't i choose USB CDC device program ?
If your MCU has a USB host it means it can communicate with USB devices.
But a PC is already a USB host in which case I can't understand why you want to try to run the embedded device as a host too - you think you can get two USB hosts to communicate?
Then you need to take some time to study the basics of USB!
USB always works with a Host (or "master") controlling a number of Devices (or "slaves").
The PC will be a Host.
You can't connect two Hosts directly together - that's why you can't directly connect two PCs with a simple USB cable!
http://janaxelson.com/usb.htm
en.wikipedia.org/.../USB
http://www.keil.com/books/usbbooks.asp
electronics.stackexchange.com/.../what-exactly-are-the-difference-between-a-usb-host-and-device
www.computer-solutions.co.uk/.../usb_tutorial.htm
Finally got the MCB2300 Demo working. I had to use the driver stuff that comes with the DEMO so that it would start working. I loaded the program into flash. It took me a few days to get it working. But really not sure why I could not get it working right away. The first time I loaded the driver it gave an error. But the error went away the next time I powered the PC up.
Today I took a good look in Device manager and saw that not the COM Ports of my USB to RS232 adapter AND the USB VCOM port were set to 9600. I brought up Tera Term twice one instance for each port. Then I would type characters into one Tera Term window and see the characters go to the other Tera Term window. There was no echo occurring in the Tera Term window I was typing in. Also the program worked in both directions.