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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... |
Tuesday, 11 December 2018 - 11:25 |
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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... |
Tuesday, 27 November 2018 - 02:35 |
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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... |
Monday, 26 November 2018 - 04:04 |
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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 "-... |
Monday, 5 November 2018 - 03:10 |
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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):... |
Monday, 8 October 2018 - 10:08 |
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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"... |
Monday, 8 October 2018 - 00:53 |
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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... |
Tuesday, 25 September 2018 - 00:31 |
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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... |
Tuesday, 4 September 2018 - 05:57 |
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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 -... |
Thursday, 9 August 2018 - 00:45 |
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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" $(... |
Friday, 27 July 2018 - 01:38 |
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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"... ... |
Sunday, 22 July 2018 - 21:26 |
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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/... |
Friday, 20 July 2018 - 11:30 |