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Title: usb connect - need help Post by: terval on November 20, 2007, 08:52:12 20:52 any one can help me on :
i need usb connectivity to pc (pic18f2550 or pic18f4550) to everything ,port(x), i2c, serial ,adc ? any idea or soft. Best regards to all. Title: Re: usb connect - need help Post by: 8K51 on November 20, 2007, 09:00:33 21:00 Hi
If you don't want to developp your own firmware UBW board is an answer : http://greta.dhs.org/UBW/ (http://greta.dhs.org/UBW/) Regards Title: Re: usb connect - need help Post by: FlvAnm on November 20, 2007, 09:09:50 21:09 Perhaps this link (http://www.alanmacek.com/usb/ (http://www.alanmacek.com/usb/)) - USB and PIC Microprocessors 16C745 and 18F2455 could be usefull.
it's quite old, but interesting. Best Regards, FLV Title: Re: usb connect - need help Post by: microled on November 20, 2007, 09:40:12 21:40 If you check the picbasic forum you will find all the answers you need, plus quite a few more!!
Title: Re: usb connect - need help Post by: frasenci on November 21, 2007, 02:32:51 02:32 @terval
All suggestions given already are ok but maybe you get confused analyzing already made examples that are more complicated than needed. I would say , try to keep it always as simple as the proyect at hands permits. 1.- First establish a clean link between PIC and Pc , that you can accomplish easy with CDC ( USb Serial ) or HID ( Both supported by MS Visual on Pc and BASIC for PIC ) 2.- Develop an communication code to talk between both platforms wich includes the commands and type of info you want to share. 3.- Write the code to handle the messages on both sides based on 2.- For example , one message coming from Pc to PIC could be the string "AAAC01XXX" where AAA = Flag to announce message start , C01 = Command for PIC to sample analog port 1 , XXX = Flag to indicate termination off message. To this , PIC could answer with another message "AAAV010985XXX" . In this mesage , AAA and XXX can have the same meaning as before and V010985 will indicate V01 = value of variable 01 , 0985 = value 985 On Pc side it will be easy to manage the polling of serial port with function OnCom() ( prescence of data on com port ). On PIC side it can be more tricky but you will soon find a way to poll the port with needed timing and let the code handle the messages from there on. Hope this simple description helps you as a very basic startpoint For CDC and HID see examples in Proteus,Proton and PBPro Greetings Title: Re: usb connect - need help Post by: terval on November 27, 2007, 08:12:22 20:12 Hi frasenci
Now i understand much more about, using your information,and it seem´s not so dificult,this protocol looks an easy way to work. regards Title: Re: usb connect - need help Post by: aj49m on November 27, 2007, 08:57:58 20:57 Certainly class CDC is easier for working with transfer data usb, Programming PC Simplifies
Title: Re: usb connect - need help Post by: drovik on November 28, 2007, 11:06:17 11:06 www.microchip.com :) or Proteus 7.2 (samples CDC, HID, GeneralUSB with temperature sensor for 18F4550)
Title: Re: usb connect - need help Post by: bogdantk on November 28, 2007, 02:25:19 14:25 Hello
The easy way is to coonect via the serial port and an FT245R adapter to USB Check http://www.ftdichip.com/Products/FT245R.htm you will find the driver also it will map the usb to a com port very easy to use Title: Re: usb connect - need help Post by: micro_2000 on November 28, 2007, 07:20:28 19:20 Hi.. The FT232R also easy to used as USB to serial converter too.
Need not additional external component. |