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Running Arduino code on an ATmega4809 Xplained-Pro board...
I'm not really that interested in WiFi, so I figured I'd see if I could get the new "Arduino WiFi v2" (which uses the ATmega4809, and mEDBG chip, and an ESP32 module, plus some...
Tue. Dec 11, 2018 - 11:25 AM
avr-gcc optimization of xor incorrectly eliminates volatile access!
Has anyone else seen this?  Any ideas?   avr-gcc (AVR_8_bit_GNU_Toolchain_3.6.1_495) 5.4.0   #include <avr/io.h> int aRead() { uint8_t h,l; l = ADCL...
Tue. Nov 27, 2018 - 02:35 AM
RSTPINCFG (enable RESET functionality) on ATmega4809 can interfere with UPDI?
So I wanted to make the RESET button on my ATmega4809 Xplained Pro actually reset the CPU (not the default, apparently), and went into the Device Programming Panel of AS7, to set...
Mon. Nov 26, 2018 - 04:04 AM
Knowing compile-time options within source code?
Is there a way to tell which compiler options have been specified on the command line, so as to take appropriate action or issue warnings?   I'm interested in know whether "-...
Mon. Nov 5, 2018 - 03:10 AM
MPLABX first users
Split form here JS https://www.avrfreaks.net/commen...   Copy of a message I sent off to AVRSupport@microchip (as they request for people trying to use MPLAB for AVR):...
Mon. Oct 8, 2018 - 10:08 AM
avr-gcc weird (non)optimization
This is avr-gcc (AVR_8_bit_GNU_Toolchain_3.6.1_495) 5.4.0 Edit: It's an ATmega4809, with those new-fangled structure-based IO register definitions.   Supposed I am "somehow"...
Mon. Oct 8, 2018 - 12:53 AM
Optiboot version 8.0 release
Optiboot version 8 is available. The major points relevant to Arduino users include: Cleanup of the MCUSR (reset reason) behavior. Ability to jump to the bootloader "as a service...
Tue. Sep 25, 2018 - 12:31 AM
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

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