[PIC] How to get the data into microcontroller through USB port

[giz.mo]

Hello all,

I am working on a project with microcontrollers, but i am not very experienced at that area. My task is to transfer data from an 8-bit parallel bus via USB port into microcontroller and process that data through microcontroller (PIC18F47J53 plug-in-module). I use PIC18 to program it and write my codes in C language. Currently i am stuck with the first part. Is there anyone who can help me out of this? I have read all the data sheets of the microcontrollers and USB libraries of Microchip but it really didn't help. I don't even know where to start. :-(
Any tips and advices would be very appreciated.

Thank you.

 

[amit.kumar11]

Hi,

Please check the USB protocol. Manufacturer must have given some example related to USB.

 

[giz.mo]

Hi,

Please check the USB protocol. Manufacturer must have given some example related to USB.

Thank you very much for your responce amit.kumar11. Nevertheless, i think i need more explanation. Now i am trying to find something useful on 'Microchip MCHPFUSB v2.3.1' in which the manufacturer provided some functions. Any suggestions?

 

[jolly jacob]

Hi,

First you start with some generic device class example code. Later please move on to your specific device class.

Below link may be useful for you.
https://sites.google.com/site/coole...utorial-list/usb-commnication-using-ccs-pic-c
https://sites.google.com/site/coolembeddedlaboratory/home/pic18f4550

Thanks,
Jolly

 

[KlausST]

Hi,

My task is to transfer data from an 8-bit parallel bus via USB port into microcontroller

Do I understand right?
From a Parallel bus via UB to microcontroller? No PC involved?

For USB transfer you need a USB master called "host", in your case is this the PIC?
And the USB device is the parallel input?

****
If my suggestons are true, then i don´t recommend to use an USB.

What data rate? What distance?

Klaus

 

[giz.mo]

Hi,

Yes exactly no PC involved in this communication! I want to transfer the data directly from 8-bit parallel bus to the microcontroller.

Why do you not recommend USB? The plug-in-module that i am using features full speed USB2.0 (12 Mbps) and the data rate on the bus is 1,7 Mbps.

Gizem

 

[KlausST]

Hi,

The plug-in-module that i am using features full speed USB2.0 (12 Mbps) and the data rate on the bus is 1,7 Mbps.

What type is it ?

Is it a USB HOST?
Can you tell more about it?

***
Why not USB.
It depends on the answers to my questions on data rate and distance.

But i see USB is a realtively big hardware and software effort for just transmitting parallel data.
It is useful if you want to drive removable standard devices like USB sticks, USB bluetooth, printers, HID...

Klaus

 

[horace1]

Hi,
Is it a USB HOST?
Can you tell more about it?

if the first post #1 a PIC18F47J53 was mentioned which only supports USB device
not sure what the USB is for ? if the project is to received data from a parallel bus why not interface the bus directly to the PIC (possibly thru level changers)?