How to send/receive a byte to/from a USB port?

[opkarmalkar]

I want to interface 8051 mcu to pc using USB port.
I want to know that how can i send/receive a byte from pc to 8051 mcu via USB port using C language?

is there any C program availaible which can write data on usb port as well as read data from USB port?

Please help

[Banfa]

You don't read/write to/from a USB port, you have a device connected through a driver in the USB driver stack.

It is not like a serial port you can just open and write to.

What interface you you plan to use/is there on the 8051 board?

[opkarmalkar]

i m just plannig to attach a manipulator.... in more sipmle words, there will be 4 or 5 motors which will rotate clockwise or counterclockwis e accrding to keys pressed on keyboard. This program will be in C & read the user input from keyboard & just send it on a USB port. On this port there will be a USB to UART bridge which will send data to serial port of 8051.

But i dont know is how to send hex code of key (which is pressed) on a USB port.

Also i want to know how to take input from USB port using C language.

[opkarmalkar]

You don't read/write to/from a USB port, you have a device connected through a driver in the USB driver stack.

It is not like a serial port you can just open and write to.

What interface you you plan to use/is there on the 8051 board?

i m just plannig to attach a manipulator.... in more sipmle words, there will be 4 or 5 motors which will rotate clockwise or counterclockwis e accrding to keys pressed on keyboard. This program will be in C & read the user input from keyboard & just send it on a USB port. On this port there will be a USB to UART bridge which will send data to serial port of 8051.

But i dont know is how to send hex code of key (which is pressed) on a USB port.

Also i want to know how to take input from USB port using C language.

[newb16]

If there is a usb to serial bridge, there must be a driver provided by the bridge manufacturer, that makes the bridge appear like a serial port to application software. So you do not need to interact with USB, only with the serial port.