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