I didn't mean it that way Olin. I ment that you didn't understand my motives. I want continous, uninterrupted high speed capture. Not a 1024 sample burst. I don't know what signal I'm going to grab, I just know I want to make something that can log whatever continously. Here-in lies the challenge. Anyone can do a burst to some memory, then pump that over some bus at their leisure. I'm trying to make something a little more worth-while here. KreAture ----- Original Message ----- From: "Olin Lathrop" To: Sent: Monday, January 20, 2003 2:09 PM Subject: Re: [PIC]: Interfacing a PIC to a computer via USB2.0 ? > > > I don't see the scope to host bandwidth as that much of a big deal. > Your > > > capture bandwidth is what counts. You will have to capture to RAM > anyway, > > > so uploading the data to the host can wait a few milliseconds. You > only > > > need to send to the host what you can look at. A decent trace would > be > > 1024 > > > points by 10 bits. Even packed into 16 bits this is only 2Kbytes. In > > > reality, I'd rather have a fast 8 bits than slower 10 bits. Either > way, > > > upload traces doesn't sound like a bottleneck. > > > > Wrong. 16 bit capture with LPT connection would mean max 1.5 Mbyte/sec > or > > 786432 samples a second if no overhead is used. > > This would give you 3 samples pr period of a 262144 Hz waveform. That's > 262 > > kHz people, not all that great. > > You didn't understand what I was trying to say. I see several problems > with what you are attempting, but since I'm just plain "wrong" elaborating > would be pointless. > > > ***************************************************************** > Embed Inc, embedded system specialists in Littleton Massachusetts > (978) 742-9014, http://www.embedinc.com > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body