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Watchdog RNG questions
I've got a project where I want to use the watchdog timer vs. the main oscillator (internal 8MHz) as an RNG.  I've done this before a few times while playing with RNG's....
Sat. Jan 5, 2019 - 12:26 AM
Sleep/wakeup problrem with mega1284p
I've used this method before on a couple of different megas and it worked fine.   I'm trying it on a mega1284p and it does not wakeup.        ...
Tue. Dec 25, 2018 - 10:53 PM
Did I see something about 24 bit integer support in AS7?
Hi Everyone,   Should there be a uint24_t ?   I am processing a grid keyboard in an ISR and I've always been able to fit them into a single 32 bit variable.  This...
Sat. Dec 22, 2018 - 03:24 PM
Detect Overflow In C
Hi Everyone,   In assembly when you add a number to another number, you have the carry flag to detect if the add resulted in an overflow.   In C, what is the best/most...
Tue. Aug 28, 2018 - 11:05 PM
I'm finally going to see what I can do with UPDI
One thing right off that bat that is odd is:   ICE pdf:  01=UPDI Datasheet from AT1614 shows 01=RESET !!!!   It shows default fuse is 01 - why call it Reset...
Thu. Jun 14, 2018 - 08:12 PM
Current with atmega640 - figured it out but interesting
I hadn't seen this before, but once I got a qfp-100 atmega640 on a giant DIP adapter from protoadvantage (they finally added pin numbering, woo hoo!), I noticed that the current...
Tue. May 15, 2018 - 12:02 PM
Slow compiling - win10 update issue maybe?
My Studio 7 usually rips through compiling, but I can see it now run each command almost like slow motion.  rm -rf main.o, then rm-rf main.d, etc., etc., It went from <1s...
Tue. May 15, 2018 - 02:13 AM
ISP mystery question - why PDI/PDO
On the atmega64a I was playing with they have the serial pin mapping using SCK from the SPI, but instead of MOSI and MISO, they are using PDI/PDO which ends up being RXD0/RXD1....
Thu. May 10, 2018 - 05:48 PM
low footprint USB virtual serial
I've been working on a secure bootloader for one of my products with a traditional USART and I have that working great.  Now I'm turning my focus on my autoprogrammer project...
Fri. Apr 20, 2018 - 09:21 PM
inline assember - set/get a uint32_t to registers...
I have a bootloader that acquires its serial number from the bootloader section, but I don't want the app to be able to read the bootloader section so I will have the fuse bits...
Wed. Apr 18, 2018 - 09:00 PM
Do the boot.h functions require using atomic/cli ?
Like boot_page_fill() - can I call this function with interrupts enabled, or must I disable them first or use an atomic block?
Wed. Apr 11, 2018 - 01:09 AM
Couple of TWI questions...
Does Atmel now Microchip have an AVR### type document where they make an ISR driven driver for TWI master and/or slave?   Does it make sense (save CPU cycles) to do the...
Mon. Apr 2, 2018 - 02:06 AM

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