From 84b980994934d54b3dad6dd2184830f4464b9933 Mon Sep 17 00:00:00 2001 From: Florian Jung Date: Sun, 29 Nov 2015 00:30:43 +0100 Subject: usb hello world \o/ --- avr/README | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 avr/README (limited to 'avr/README') diff --git a/avr/README b/avr/README new file mode 100644 index 0000000..16c75d9 --- /dev/null +++ b/avr/README @@ -0,0 +1,47 @@ +This is a Rotary-Dial-to-USB-Interface, based on the USB AVR Lab +(http://www.ullihome.de/wiki/USBAVRLab/index). For the schematics +of the USB AVR Lab, see http://www.ullihome.de/wiki/USBAVRLab/Download + +This is a tiny board with an ATMEGA8 speaking USB using the V-USB +library. It features a 10-pin-port with some AVR pins routed out, +and also has a bootloader, so it can be programmed without an +ISP adapter, using USB. + + +The Rotary-Dial-to-USB-Interface expects a rotary dial to be attached against PB4/5. +When you look at the front of the connector: + ____ ____ +| 9 7 . . . | Attach the two cables for the idle switch at 9 and 0. +| 0 8 . . . | Attach the two cables for the dial pulse switch at 7 and 8. + ----------- (0 and 8 are routed to GND, 9 and 7 to PB4 and PB5.) + +The program expects the "idle"-switch to be open when the dial is idle, and to be closed +when the rotary dial is not in its idle position. +The "pulse" switch is expected to be closed most of the time, and to be only opened shortly +for each pulse. +(This can be adapted easily). + +When attached to a computer, the device acts like a USB HID keyboard, no +additional drivers are needed. + + +If you want to enter the bootloader, then generate more than 17 dial pulses by +dialing a zero, not letting the dial return fully into idle position yet, +and pulling it to zero again. + + + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + + For details, see main.c -- cgit v1.2.3