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".
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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...
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...
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...
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.
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". ...
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...
Great explanation, thank you.
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...
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?
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...
Found the issue. Had to call "init()" in "main". It's defined under "cores/arduino//wiring.c".
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...
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...
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.
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...
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