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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2016 Gerhard Sittig <gerhard.sittig@gmx.net> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | ''' | |
21 | PDI (Program and Debug Interface) is an Atmel proprietary interface for | |
22 | external programming and on-chip debugging of the device. | |
23 | ||
24 | See the Atmel Application Note AVR1612 "PDI programming driver" and the | |
25 | "Program and Debug Interface" section in the Xmega A manual for details. | |
26 | ||
27 | The protocol uses two pins: the RESET pin and one dedicated DATA pin. | |
28 | The RESET pin provides a clock, the DATA pin communicates serial frames | |
29 | with a start bit, eight data bits, an even parity bit, and two stop bits. | |
30 | Data communication is bidirectional and half duplex, the device will | |
31 | provide response data after reception of a respective request. | |
32 | ||
33 | Protocol frames communicate opcodes and their arguments, which provides | |
34 | random and sequential access to the device's address space. By accessing | |
35 | the registers of internal peripherals, especially the NVM controller, | |
36 | it's possible to identify the device, read from and write to several | |
37 | kinds of memory (signature rows, fuses and lock bits, internal flash and | |
38 | EEPROM, memory mapped peripherals), and to control execution of software | |
39 | on the device. | |
40 | ''' | |
41 | ||
42 | from .pd import Decoder |