From: Marko Mäkelä (msmakela_at_gmail.com)
Date: 2008-03-05 14:41:07
On Wed, Mar 05, 2008 at 02:08:05PM +0100, Antitrack@networld.at wrote: > > Quoting Spiro Trikaliotis <email@example.com>: > > > Hello Alex, > > > > You need to be able to gather (and send) data at 1.5 Mbit/s for USB 1.1 > > low speed. > > Ouch, such a high speed is really required? What is my USB mouse doing, then? > Is it also sending the x/y coordinates data at _that_ speed? Yes, when the host polls it for data. USB is a packet-oriented master-slave serial bus with a tree topology. > And there is no "inofficial" trick to circumvent the speed problem in sight? Not that I know. Besides, Christian Starkjohann from obdev.at (the guy behind the AVR-USB bitbanging driver for Atmel AVR microcontrollers, http://www.obdev.at/products/avrusb/index.html) wrote me some time ago: >> Es gibt zwar eine Low Speed USB Host Implementation in Firmware fuer >> den AVR, aber es gibt keine USB memory sticks in low speed und das GPS >> ist sicher auch Full Speed. I was interested in implementing a data logger that would talk to a GPS receiver and a USB Storage device. According to him, these devices most likely except the host to do 12 Mb/s or 480 Mb/s, which requires dedicated hardware. (For the record, I decided to wait for a decent programmable GPS-enabled mobile phone.) There are some USB host interface chips that could be useful. Some time ago, I read that there is a USB HID (keyboard and mouse) driver for the Atari 8-bit computers. Probably it was using some parallel-to-USB or SPI-to-USB chip, such as the MAX3421E. (Please don't confuse these with the likes of the FTDI FT232 or FT245; they are for USB devices.) Marko Message was sent through the cbm-hackers mailing list
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