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Is it possible to tell between data in PROGMEM or SRAM at runtime?
Hi all,   If I do this: static const uint8_t bitmap[] __attribute__((progmem)) = { 0x7F, 0x04, 0x08, 0x10, 0x7F, 0x00, };  or this: static const...
Wednesday, 6 May 2020 - 20:07
ATMega8u2 strange problem
Hi all.   I have a clone Arduino MEGA board which uses an ATmega8u2 as the USB to serial link. It works fine.   What I did was to change the low fuse of the 8u2 from...
Monday, 4 May 2020 - 04:20
Question about PROGMEM and __flash: can I eliminate a step?
Hi all,   I have lots of bitmap files (character font data for a graphics VFD display) in PROGMEM as such: #ifndef IBM_8X16_H #define IBM_8X16_H #define ibm_8x16 (...
Saturday, 25 April 2020 - 13:26
[SOLVED] Question: AVR, interrupts and ISR
Hi all,   I searched here and found quite a few posts about ISRs and interrupts, but none answered my question. Please consider this example code:   volatile uint8_t x...
Sunday, 29 March 2020 - 20:33
SO8N package - pin 1?
Hi all,   I've got some 8 pin SOIC package chips in a tape. Pin 1 is not marked in any way on the chip!  There is no notch on the pin 1 end, no dot molded into the part...
Tuesday, 10 March 2020 - 23:23
Wetted switch contacts
Hi all,   I tried an experiment today which was completely successful and the info may be of use to some.   I have a small quantity of GALINSTAN which is an eutectic...
Monday, 9 March 2020 - 05:25
Calling a function by address
Hi all, I would like to know if it is possible to call a function by address as well as pass data to it and return data from it? For example, if I write a function that takes two...
Saturday, 7 March 2020 - 06:00
AVR xml files
Hi all,   I use Linux and therefore cannot use or install AVR Studio. I don't even want to, but I do want to get a copy of all the AVR xml files that have individual chip...
Thursday, 5 March 2020 - 10:36
Strange operator - what does this mean and/or do?
Hi all,   I was looking at the file wiring_shift.cpp in my Arduino setup and saw something I've never seen before:   void shiftOut (int dataPin, int clockPin, uint8_t...
Saturday, 18 January 2020 - 23:07
Possible to use a variable to point to Serial or LCD or other char devices?
Hi all,   What I'm trying to figure out is how to use a variable to point to different character devices. Here's an example of what I want to do:   static LiquidCrystal...
Monday, 23 December 2019 - 23:18
Question about flash memory as used in an SSD or MCU
I hope this is in the correct forum. If not, mods please move it and my apologies. OK... we know that EEPROM and FLASH memory must be erased prior to writing (that is, bytes or...
Friday, 13 December 2019 - 07:31
SMD crystal package modification question
Hi all, I like to use crystals vs resonators for AVR boards (both Arduino and home made standalone). To replace the resonator on an Arduino board, a 2 smd no-lead package of size...
Tuesday, 22 October 2019 - 14:09

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