Add initial man page graciously contributed by Joerg Wunsch. Thanks
Joerg! git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@41 81a1dc3b-b13d-400b-aceb-764788c761c2
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.\" Copyright (c) 2001 Joerg Wunsch
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.\"
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $Id$
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.\"
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.Dd DATE January 19, 2001
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.Os
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.Dt AVRPROG 1
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.Sh NAME
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.Nm avrprog
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.Nd driver program for ``simple'' Atmel AVR MCU programmer
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.Sh SYNOPSIS
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.Nm
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.Fl p Ar partno
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.Op Fl e
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.Oo Fl E Ar exitspec Ns
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.Op \&, Ns Ar exitspec
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.Oc
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.Op Fl f Ar format
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.Op Fl F
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.Op Fl i Ar filename
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.Op Fl m Ar memtype
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.Op Fl o Ar filename
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.Op Fl P Ar parallel
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.Op Fl t
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.Sh DESCRIPTION
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.Nm Avrprog
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is a driver program for a simple programming hardware that allows to
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program Atmel AVR microcontrollers, where the programmer is connected
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directly to a
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.Xr ppi 4
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parallel port. In the simplest case, the hardware consists just of a
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cable, connecting the respective AVR signal lines to the parallel port.
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.Pp
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The MCU is programmed in
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.Em serial programming mode ,
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so the MCU signals
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.Ql /RESET ,
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.Ql SCK ,
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.Ql MISO
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and
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.Ql MOSI
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need to be connected to the parallel port. Optionally, some otherwise
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unused output pins of the parallel port can be used to supply power for
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the MCU part, so it is also possible to construct a passive standalone
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programming device.
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.Pp
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Input files can be provided, and output files can be written in
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different file formats, such as raw binary files containing the data
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to download to the chip, Intel hex format, or Motorola S-record
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format. There are a number of tools available to produce those files,
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like
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.Xr asl 1
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as a standalone assembler, or
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.Xr avr-objcopy 1
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for the final stage of the GNU toolchain for the AVR microcontroller.
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.Pp
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Both, EEPROM cells and the flash ROM can be programmed (separately).
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It is also possible to read the chip (provided it has not been
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code-protected previously, of course) and store the data in a file.
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Finally, a ``terminal'' mode is available that allows to interactively
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communicate with the MCU, and to display or program individual various
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memory cells even one at a time if desired.
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.Ss Options
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In order to control all the different operation modi, a number of options
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need to be specified to
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.Nm .
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.Bl -tag -offset indent -width indent
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.It Fl p Ar partno
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This is the only option that is mandatory for every invocation of
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.Nm .
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It specifies the type of the MCU connected to the programmer. Currently,
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the following MCU types are understood:
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.Pp
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.TS
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ll.
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\fBOption tag\fP \fBOfficial part name\fP
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1200 AT90S1200
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2313 AT90S2313
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2333 AT90S2333
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4433 AT90S4433
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4434 AT90S4434
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8515 AT90S8515
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8535 AT90S8535
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.TE
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.It Fl e
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Causes a chip erase to be executed. This will reset the contents of the
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flash ROM and EEPROM to the value
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.Ql 0xff ,
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and is basically a prerequisite command before the flash ROM can be
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reprogrammed again. The only exception would be if the new
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contents would exclusively cause bits to be programmed from the value
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.Ql 1
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to
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.Ql 0 .
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Note that in order to reprogram EERPOM cells, no explicit prior chip
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erase is required since the MCU provides an auto-erase cycle in that
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case before programming the cell.
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.It Xo Fl E Ar exitspec Ns
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.Op \&, Ns Ar exitspec
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.Xc
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By default,
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.Nm
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leaves the parallel port in the same state at exit as it has been
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found at startup. This option modifies the state of the
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.Ql /RESET
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and
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.Ql Vcc
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lines the parallel port is left at, according to the
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.Ar exitspec
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arguments provided, as follows:
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.Bl -tag -width noreset
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.It Ar reset
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The
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.Ql /RESET
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signal will be left activated at program exit, that is it will be held
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.Em low ,
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in order to keep the MCU in reset state afterwards. Note in particular
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that the programming algorithm for the AT90S1200 device mandates that
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the
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.Ql /RESET
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signal is active
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.Em before
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powering up the MCU, so in case an external power supply is used for this
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MCU type, a previous invocation of
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.Nm
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with this option specified is one of the possible ways to guarantee this
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condition.
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.It Ar noreset
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The
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.Ql /RESET
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line will be deactivated at program exit, thus allowing the MCU target
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program to run while the programming hardware remains connected.
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.It Ar vcc
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This option will leave those parallel port pins active
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.Pq \&i. \&e. Em high
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that can be used to supply
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.Ql Vcc
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power to the MCU.
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.It Ar novcc
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This option will pull the
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.Ql Vcc
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pins of the parallel port down at program exit.
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.El
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.Pp
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Multiple
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.Ar exitspec
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arguments can be separated with commas.
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.It Fl f Ar format
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This option specifies the file format for the input or output files
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to be processed.
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.Ar Format
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can be one of:
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.Bl -tag -width sss
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.It Ar i
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Intel Hex
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.It Ar s
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Motorola S-record
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.It Ar r
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raw binary; little-endian byte order, in the case of the flash ROM data
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.It Ar a
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auto detect; valid for input only, and only if the input is not
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provided at
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.Em stdin .
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.El
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.Pp
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The default is to use auto detection for input files, and raw binary
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format for output files.
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.It Fl F
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Normally,
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.Nm
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tries to verify that the device signature read from the part is
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reasonable before continuing. Since it can happen from time to time
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that a device has a broken (erased or overwritten) device signature
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but is otherwise operating normally, this options is provided to
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override the check.
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.It Fl i Ar filename
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Specifies the input file to be programmed into the MCU. Can be specified
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as
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.Ql \&-
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to use
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.Em stdin
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as the input.
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.It Fl m Ar memtype
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Specifies which program area of the MCU to read or write; allowable
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values are
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.Em eeprom
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for the EEPROM, or
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.Em flash
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for the flash ROM, which is also the default.
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.It Fl o Ar filename
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Specifies the name of the output file to write, and causes the respective
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memory area to be read from the MCU. Can be specified as
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.Ql \&-
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to write to
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.Em stdout .
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.It Fl P Ar parallel
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Use
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.Ar parallel
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as the
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.Xr ppi 4
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device to communicate with, instead of the default
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.Pa /dev/ppi0 .
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.It Fl t
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Tells
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.Nm
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to enter the interactive ``terminal'' mode instead of up- or downloading
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files. See below for a detailed description of the terminal mode.
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.El
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.Ss Terminal mode
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In this mode,
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.Nm
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only initializes communication with the MCU, and then awaits user
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commands on standard input. Commands and parameters may be
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abbreviated to the shortest unambiguous form. Terminal mode provides
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a command history using
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.Xr readline 3 ,
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so previously entered command lines can be recalled and edited. The
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following commands are currently implemented:
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.Bl -tag -offset indent -width indent
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.It Ar dump eeprom\&|flash addr nbytes
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Read
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.Ar nbytes
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bytes from the specified memory area, and display them in the usual
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hexadecimal and ASCII form.
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.It Ar dump
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Continue dumping the memory contents for another
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.Ar nbytes
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where the previous
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.Ar dump
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command left off.
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.It Ar write eeprom\&|flash addr byte1 ... byteN
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Manually program the respective memory cells, starting at address
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.Ar addr ,
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using the values
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.Ar byte1
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through
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.Ar byteN .
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.It Ar erase
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Perform a chip erase.
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.It Ar sig
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Display the device signature bytes.
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.It Ar part
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Display the current part settings.
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.It Ar \&?
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.It Ar help
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Give a short on-line summary of the available commands.
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.It Ar quit
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Leave terminal mode and thus
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.Nm avrprog .
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.El
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.Sh FILES
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.Bl -tag -offset indent -width /dev/ppi0XXX
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.It Pa /dev/ppi0
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default device to be used for communication with the programming
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hardware
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.It Pa ~/.inputrc
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Initialization file for the
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.Xr readline 3
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library
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.El
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.\" .Sh EXAMPLES
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.\" .Sh DIAGNOSTICS
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.Sh SEE ALSO
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.Xr asl 1 ,
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.Xr avr-objcopy 1 ,
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.Xr ppi 4 ,
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.Xr readline 3
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.Pp
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The AVR microcontroller product description can be found at
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.Pp
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.Dl "http://www.atmel.com/atmel/products/prod23.htm"
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.\" .Sh HISTORY
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.Sh AUTHORS
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.Nm Avrprog
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was written by Brian S. Dean.
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.Pp
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This man page by
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.ie t J\(:org Wunsch.
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.el Joerg Wunsch.
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.Sh BUGS
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Motorola S-record files are not yet implemented.
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