Triggered by the impending release of FreeBSD 6.3 and 7.0 (yes, they
prepare a stable and a bleeding edge release almost in parallel), most
of the AVR opensource tools have got new releases as well. In detail
This is a "sneak preview" of the avr-libc development tree. Its
primary intention is to provide some kind of public gamma testing for
the new features in it. In no particular order, the list of new
- A completely rewritten floating-point library, contributed by
Dmitry Xmelkov. It is smaller and faster, but as it's an almost full
rewrite, this triggered the intention to prepare a public release from
the development source code base.
- A rewritten and much extended
, contributed by Dean Camera. This re-introduces the availability for a macro that can
be used to declare an ISR that starts with interrupts initially
enabled, but also simplifies declaring "naked" ISRs, and includes ISR
aliasing features as well.
The older ISR_ALIAS() macro has been deprecated in favour of the
ISR_ALIASOF() attribute to the rewritten ISR() macro.
helper file, contributed by Cliff Lawson and Carlos Lamas. The idea behind that file is to provide a simple
preprocessor logic for the calculation of AVR baud rate prescaler
values, which also includes a check against a pre-defined acceptable
baud-rate tolerance (2 % by default), and also automatically
suggesting the use of the U2X bit when it's necessary in order to
achieve the baud-rate tolerance.
, also contributed by Dean Camera. This offers a nice wrapper to make certain brace-blocks in an application atomic
with respect to being not interrupted.
So please test it, folks! By its time, the code base that can be seen
there will eventually become release 1.6.0, forming a new stable
This is the current release of avr-libc from the stable branch.
Please see the NEWS file for a list of changes, compared to 1.4.6:
- Add support for the USBtinyISP programmer (patch #6233)
- Add support for the C2N232I serial bitbang programmer (patch #6121)
New CPU support added:
- AT90PWM2B/AT90PWM3B (same as AT90PWM2/3 but different signature)
New features added:
- Software breakpoints are now also supported when using JTAG.
Summary of important bug fixes:
- Complete overhaul of the USB communication, making it much more robust, and less resource-consuming.
- DebugWire bug fix submittted by Shaun Jackman.
The FreeBSD ports of avr-binutils and avr-gcc have been updated to
binutils 2.18, and GCC 4.2.2, respectively. This includes updating
the patches contained therein, which are apparently used by others as
reference for own porting efforts.
I'd like to thank everyone who contributed to these efforts! Thank
you, merci, gracias, danke schoen, mange tak, spasibo bolshoye!