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Why doing a loop-back test requires pulling the RESET low?
No I a actually tried those steps Without grounding the reset pin and echo did not work so was wondering how Tx/Rx could be in use by M328 if it's not outputting anything.
Tuesday, 30 June 2020 - 22:02
Why doing a loop-back test requires pulling the RESET low?
almost clear. You mentioned "because it too is connected to the TX and RX pins, and you don't want two devices both trying to drive the bridges RX line at the same time".  ...
Tuesday, 30 June 2020 - 21:17
Why doing a loop-back test requires pulling the RESET low?
The loopback would need a jumper between Arduino pins 0 to 1 to make the "loop back" happen. What do you mean by that? (sorry not an electrical engineer). Tx/Rx lines seems to be...
Tuesday, 30 June 2020 - 20:48
Why does the Arduino Uno board have 2 external Oscillators?
Great explanation, thank you.
Tuesday, 30 June 2020 - 19:48
Why doing a loop-back test requires pulling the RESET low?
But holding the M328 in reset also puts it in ICSP programming mode, which should put it in some "listening" mode?   When the reset is not low, I cannot see...
Tuesday, 30 June 2020 - 19:47
What does constantly pulling the RESET pin low do?
Who-me wrote:reset the Program Counter, which points to the next byte to execute.  Resets it to a predefined memory address? or to 0?
Tuesday, 30 June 2020 - 12:19
What does constantly pulling the RESET pin low do?
DocJC wrote: When reset is NOT pulled low, what happens to the same set of instructions sent to the MCU? As Brian said, pulling the Reset\ pin low can initiate an ISP...
Monday, 29 June 2020 - 23:24
Use the unix Screen program to interact with Arduino via UART
Found the issue. Had to call "init()" in "main". It's defined under "cores/arduino//wiring.c".  
Tuesday, 23 June 2020 - 13:04
Use the unix Screen program to interact with Arduino via UART
Yes I just tired it using these instructions: https://forum.arduino.cc/index.php?topic=73748.0   And it worked, I could see characters I type appear on the "Screen...
Tuesday, 23 June 2020 - 01:53
Use the unix Screen program to interact with Arduino via UART
Yes that's the one.    I thought I have it setup correctly. It doesn't have to be Screen, I can just do a normal "cat" and "echo" on"/dev/cu.usbmodem14201" and I...
Monday, 22 June 2020 - 21:58
Use the unix Screen program to interact with Arduino via UART
set up the code in your remote device to echo! Or, maybe screen has an echo mode? That's the second part which is supposed to write it back to my PC.
Monday, 22 June 2020 - 21:49
Difference between UART and SPI
Thanks, so with this definition, I don't get why UART ever existed? I mean all it does is generate pulses similar to other protocols, can't the CPU have done it, like it does...
Friday, 12 June 2020 - 17:38

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