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Having Some non specific Issues
I'm not going to give you the equation - you can Google it just fine, but I will give you a litl' rule o' thumb.   Imagine if you wanted 100uS per bit.  Then 0.2%...
Tuesday, 26 January 2021 - 19:38
Having Some non specific Issues
Ahh.  You may have slightly misunderstood the data sheet.  When the 2560 tells you that at 16MHz it has 0.2% error at 9600 baud (presuming you've set your UART registers...
Tuesday, 26 January 2021 - 19:21
Having Some non specific Issues
Do you have test gear to measure your clock?  Most multimeters won't, some expensive ones will.  An oscilloscope would be even better.  Consider programming the '...
Tuesday, 26 January 2021 - 17:03
Integrating ISP programming 6-pin header in my circuit
Oh, and on schematic drawing, avrcandies is technically correct (best kind) but I wouldn't worry too much.  Here's my take:     That's an application for his other...
Tuesday, 26 January 2021 - 13:23
Integrating ISP programming 6-pin header in my circuit
I have to admit not all, but about 99% of all the AVR boards I've ever laid out have had the programming connector on them (and those that didn't often got it strung on with...
Tuesday, 26 January 2021 - 12:58
Persist a byte of data externally, in a mutex operation
gchapman wrote:   ...   Block Diagram | AVR® DB Family UPDI Timing | AVR® DB Family       Almost wonder if we're losing the essential simplicity of the...
Saturday, 23 January 2021 - 18:57
Persist a byte of data externally, in a mutex operation
gchapman wrote: Scroungre wrote:I think you would need an awful lot of pins - or another UART - to get that sort of debugging information out of an AVR.The PDI and UPDI...
Saturday, 23 January 2021 - 16:25
Persist a byte of data externally, in a mutex operation
joakimk wrote:Well... It's 50% for fun and curiosity. Regarding the number of bits, I want a byte because I want to be able to output many different locations. If not line numbers...
Saturday, 23 January 2021 - 16:11
Persist a byte of data externally, in a mutex operation
I have another suggestion:  Just because your dedicated hardware UART is talking to an ESP gizmo doesn't mean you can't also have a bit-banged UART on a couple of other pins...
Saturday, 23 January 2021 - 14:53
Persist a byte of data externally, in a mutex operation
Note that neither of those chips will let you read back into the AVR what was written yea unto them.  They're one-way - the AVR writes the latch, and nothing comes back....
Saturday, 23 January 2021 - 14:26
Persist a byte of data externally, in a mutex operation
You could.  A 74ALS373 would be a couple dollars cheaper, but you don't get the 150mA LED drive that you might want.  S.   Edited to add linky: https://www.jameco....
Saturday, 23 January 2021 - 14:14
Persist a byte of data externally, in a mutex operation
I think you would need an awful lot of pins - or another UART - to get that sort of debugging information out of an AVR.  It would also do horrible things to your program...
Saturday, 23 January 2021 - 13:50

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