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<title>AVRDUDE: 2.2 Programmers accepting extended parameters</title>
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<a name="Programmers-accepting-extended-parameters"></a>
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<a name="Programmers-accepting-extended-parameters-1"></a>
<h2 class="section">2.2 Programmers accepting extended parameters</h2>
<dl compact="compact">
<dt><code>JTAG ICE mkII</code></dt>
<dt><code>AVR Dragon</code></dt>
<dd>
<p>When using the JTAG ICE mkII or AVR Dragon in JTAG mode, the
following extended parameter is accepted:
</p><dl compact="compact">
<dt><code>‘<samp>jtagchain=UB,UA,BB,BA</samp>’</code></dt>
<dd><p>Setup the JTAG scan chain for <var>UB</var> units before, <var>UA</var> units
after, <var>BB</var> bits before, and <var>BA</var> bits after the target AVR,
respectively.
Each AVR unit within the chain shifts by 4 bits.
Other JTAG units might require a different bit shift count.
</p></dd>
</dl>
</dd>
<dt><code>AVR910</code></dt>
<dd>
<p>The AVR910 programmer type accepts the following extended parameter:
</p><dl compact="compact">
<dt><code>‘<samp>devcode=VALUE</samp>’</code></dt>
<dd><p>Override the device code selection by using <var>VALUE</var>
as the device code.
The programmer is not queried for the list of supported
device codes, and the specified <var>VALUE</var>
is not verified but used directly within the
<code>T</code> command sent to the programmer.
<var>VALUE</var> can be specified using the conventional number notation of the
C programming language.
</p></dd>
<dt><code>‘<samp>no_blockmode</samp>’</code></dt>
<dd><p>Disables the default checking for block transfer capability.
Use
‘<samp>no_blockmode</samp>’ only if your ‘<samp>AVR910</samp>’
programmer creates errors during initial sequence.
</p></dd>
</dl>
</dd>
<dt><code>BusPirate</code></dt>
<dd>
<p>The BusPirate programmer type accepts the following extended parameters:
</p><dl compact="compact">
<dt><code>‘<samp>reset=cs,aux,aux2</samp>’</code></dt>
<dd><p>The default setup assumes the BusPirate’s CS output pin connected to
the RESET pin on AVR side. It is however possible to have multiple AVRs
connected to the same BP with MISO, MOSI and SCK lines common for all of them.
In such a case one AVR should have its RESET connected to BusPirate’s
<em>CS</em>
pin, second AVR’s RESET connected to BusPirate’s
<em>AUX</em>
pin and if your BusPirate has an
<em>AUX2</em>
pin (only available on BusPirate version v1a with firmware 3.0 or newer)
use that to activate RESET on the third AVR.
</p>
<p>It may be a good idea to decouple the BusPirate and the AVR’s SPI buses from
each other using a 3-state bus buffer. For example 74HC125 or 74HC244 are some
good candidates with the latches driven by the appropriate reset pin (cs,
aux or aux2). Otherwise the SPI traffic in one active circuit may interfere
with programming the AVR in the other design.
</p>
</dd>
<dt><code>‘<samp>speed=<var>0..7</var></samp>’</code></dt>
<dd><dl compact="compact">
<dt><code>0</code></dt>
<dd><p>30 kHz (default)
</p></dd>
<dt><code>1</code></dt>
<dd><p>125 kHz
</p></dd>
<dt><code>2</code></dt>
<dd><p>250 kHz
</p></dd>
<dt><code>3</code></dt>
<dd><p>1 MHz
</p></dd>
<dt><code>4</code></dt>
<dd><p>2 MHz
</p></dd>
<dt><code>5</code></dt>
<dd><p>2.6 MHz
</p></dd>
<dt><code>6</code></dt>
<dd><p>4 MHz
</p></dd>
<dt><code>7</code></dt>
<dd><p>8 MHz
</p></dd>
</dl>
</dd>
<dt><code>‘<samp>ascii</samp>’</code></dt>
<dd><p>Use ASCII mode even when the firmware supports BinMode (binary mode).
BinMode is supported in firmware 2.7 and newer, older FW’s either don’t
have BinMode or their BinMode is buggy. ASCII mode is slower and makes
the above
‘<samp>reset=</samp>’
and
‘<samp>speed=</samp>’
parameters unavailable.
</p></dd>
</dl>
</dd>
<dt><code>Wiring</code></dt>
<dd>
<p>When using the Wiring programmer type, the
following optional extended parameter is accepted:
</p><dl compact="compact">
<dt><code>‘<samp>snooze=<var>0..32767</var></samp>’</code></dt>
<dd><p>After performing the port open phase, AVRDUDE will wait/snooze for
<var>snooze</var> milliseconds before continuing to the protocol sync phase.
No toggling of DTR/RTS is performed if <var>snooze</var> > 0.
</p></dd>
</dl>
</dd>
</dl>
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