USBDemo, something to learn USB a little bit

[Josuetas]

Hi, This really is a nice post, I am going to work with it, i will have to use 18f2550 since it is the available part around here.

1. Any problem with it being the 2550? someone said "Thank god you didn´t choose the 2550" before.

2. I guess i`ve read the answer to this but...: Usb Communications require somehow a "master"(host) and a "slave"? if this is so, i would never be able to communicate two pics through USB would I?, where i am going is that i intend to control USB devices but this could never be done if this is true, has anyone figured something without buyign those ugly USB HOST controllers? they really are a pain in the a.. you can´t find them at all(not here).

I have a uC develpment to control by serial (rS232) port some GSM phones, but the newer models dont support serial but USB, what should be done to transfer data between a uc and them?

It seems to me like an step backwards the fact that usb had lost the simplicity of RS232 communications in this matter.

thanks for the hobby time again

[mister_e]

1. There's no real problem with the 2550. It was just an inside between me and Malc about a previous thread on some behaviour to program this specific PIC with his PIC programmer. not much. Don't worry.

2. You can't use a PIC to PIC USB comm unless you really want to waste your time to develop a host controller... not something i would do. Hence why there's a few available on the market.

USB is not as simple as RS232 of course, it's another and really different animal.

Good luck!

[Noise.be]

I lately bought the book of Jan Axelson and this realy helped me. Here the link of Amazon
USB Complete: Everything You Need to Develop Custom USB Peripherals

Good Luck ;-)

[malc-c]

1. Any problem with it being the 2550? someone said "Thank god you didn´t choose the 2550" before.

Don't be put off by my comments. As Steve mentioned it was a "toung in cheek" jibe as poor old Steve and I spent days trying to get an 18F2550 programmed with some bit of code using my cheap JDM programmer and some freeware loaders !