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Part 1 : How to build a USB device with a PIC 18F4550 or 18F

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Posted by Vijay, on 22-12-2007 16:00, IP 91.189.0.206

1. Inquiry about PIC 18F4550 programmer

i am doing a project on USB interfacing. i want to send the the data to USB port to control various electronic device interfaced with PIC 18F4550.PC(Host) will have some coding in C/C++ and will send the data to USB port.i want USB driver for The IC18F4550.i have downloaded the MCHPFSUSB.exe.but i don't know how to use it to write the program in turboC/C++.
I want programmer circuit and software for PIC18F4550.in your project you have used the Olimex tiny-ICSD programmer..can you tell me from where will it be available?

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Posted by direk, on 30-12-2007 12:21, IP 83.13.192.34

2. Error on PCB?

On schematic R5 is connected between +5V and RB4. Why on PCB it's connected to GND instead of +5V? Am I wrong, or there's a little mistake? :-)

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Posted by m.ashrafpur, on 09-02-2008 16:19, IP 82.99.254.4

3. question

hi.thanks for your useful web page.
2 question:
1-in which compiler do u compile your code?
2-how I can program the 18f2550/4555... usp version pic's
request:
ur labview program is very simple and very useful.may u create a labview programing training part for usb communication in ur site?
in datasheet of pic18f2455/.. family in first page note that "...programing (ICSP)via two point". is it same as 16f877A in circuit program able or is it support bootloader programer that use serial port?

thanks a lot for ur reply

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Posted by stefan, on 26-02-2008 15:02, IP 194.138.39.56

4. access to transmitted data

Hi,
I would like to use the PIC18F4550 USB Demo Board to read out an SPI-Interface and send these data via USB to the PC. The compiler I use is the C18 compiler. I belief, that I am able to implement the SPI interface at the PIC. But I don't know which .h and .c files from the firmware are required. Do you have some examples?
The second question I have is how can I visualize the transmitted data on the PC? The software I am going to use is Visual Basic 2008 (Freeware). Have you some basic instructions?

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Posted by Amilion, on 14-04-2008 03:33, IP 70.53.195.22

5. CDC program and Timer on 18F4550

I have built a demo board using a 18F4550. I modified the cdc example in order to send data to the PC using the USB interface. I want to time stamp the messages, to do this i use Timer0 as a real time clock. The timer works in the simulation mode, but does not work on the real board. Does anyone have a clue to solve this problem ?

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