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Weird optimization failure (SAMD21 CM0 gcc)
arm gcc (the version in the Arudino package; relatively recent)   // the pin is not an output, disable pull-up if val is LOW, otherwise enable pull-up volatile...
Tue. Sep 4, 2018 - 05:57 AM
avr-gcc optimization of call-used registers...
Call-used registers (r18-r27, r30-r31): May be allocated by gcc for local data. You may use them freely in assembler subroutines. Calling C subroutines can clobber any of them -...
Thu. Aug 9, 2018 - 12:45 AM
External Recursive Makefile fails on Win64
Recursive makefiles are relatively common. For example, for the optiboot bootloader "make xplained168pb" invokes a target that does "$(MAKE) atmega168 BAUD_RATE=57600"   $(...
Fri. Jul 27, 2018 - 01:38 AM
ARM GCC for Cortex-M4F and double-precision floats
Do the arm gcc libraries for double precision floating point use the single-precision FP hardware present on an M4F? I'm getting benchmark results that seem to say "no"...  ...
Sun. Jul 22, 2018 - 09:26 PM
Device Family Packs are annoying...
I really don't want to have to type:    avr-gcc -mmcu=atmega328pb -B /home/packs/Atmel.ATmega_DFP.1.0.86/gcc/dev/atmega328pb/ -I /home/packs/Atmel.ATmega_DFP.1.0.86/...
Fri. Jul 20, 2018 - 11:30 AM
Multiple targets for an AS project?
Is there a standard, preferred, way to set up a project so that it can be compiled for more than one (similar) chip? Say I have a bootloader that will compile for ATmega88*,...
Fri. Jul 20, 2018 - 05:40 AM
avr-gcc -flto bug, maybe because weak symbols that eval. to zero?
(also sent to avr-gcc-list mailing list)   Discovered on Arduino (4.9.2-atmel3.5.4) ( http://forum.arduino.cc/index.php?topic=556674.0 ) So I have this pretty trivial avr-gcc...
Sat. Jul 7, 2018 - 01:19 AM
Compiler bug - with LTO only?
The arduino folk seem to have found a compiler bug, that occurs only when using link-time-optimization.   http://forum.arduino.cc/index.ph... How do you even collect...
Fri. Jul 6, 2018 - 10:02 AM
General Timer register Synchronization question.
The TC timers and RTC in the SAMD series have a COUNT register that requires "Read Synchronization" When executing an operation that requires synchronization, the Synchronization...
Fri. Jun 22, 2018 - 12:26 AM
instrumenting functions
Is there a way to get gcc to include some user-provided code into function prologues?  I see that there is -finstrument-functions which is close to what I want, but it...
Tue. Feb 20, 2018 - 11:43 PM
Amazon buys FreeRTOS...
https://aws.amazon.com/freertos/ https://aws.amazon.com/blogs/ope...   That's wild ...  I didn't know that such a thing was even within the realm of possibility!...
Fri. Dec 1, 2017 - 08:04 AM
ASF I2C library for SAMD does floating point, causing bloat
apparently  _i2c_master_set_config() does this poorly documented: It turns out (http://www.eevblog.com/forum/mic... ) that the ASF function _i2c_master_set_config() uses...
Tue. Nov 21, 2017 - 09:11 PM

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