gabidanpremier: I have inspected both signals with my oscilloscope and I didn't see anything there. If it's a problem of noise on the Rx with my setup, I think some people would have experienced the same problem with the Arduino Mega2560.
Maybe the bootloader is really waiting for something. But what and why ?
No signal seen at all, no steady low, no steady high? Maybe you forgot to turn on the scope?
Hey I have the same exact issue with my mega2560. But mine is a genuine arduino I bought. It works perfectly but if I open serial monitor it take about 10 secs to start running again. BUT if I open the serial monitor I can press the reset on the mega and it will start right away?
I don't understand why I need the phillip resistors one either Tx or Rx pins. I will try that. Also I'm kinda new to arduinos. How do I edit the fuses?
Btw my brother had a mega2560 and has same problem. It's not really a big problem just wondering why it does that.
Cautiously. If you change the wrong things you may brick the processor. Make sure you understand what you are doing. Preferably key in your existing fuse values into a calculator, and then just change one bit.
Reply #21 appears to indicate that reset goes low only briefly.
However apart from the presence of the capacitor which is charged when RTS goes low, I can't see any reason why the two different reset methods should behave differently.
Your correct again as usual. This thread has been going so long I forgot I even posted on it before.
I've got to admit this is one of the more unsual and puzzeling symptom problems that I can recall here.
Almost remind me of the rare but repeatable DTR auto-reset 'lock-up problem' that that led to arduino adding the reverse biased diode from reset pin to Vcc on Rev3 boards, which 'fixed' that problem.
The final thing I can think to ask is what bootloader do you have on the chip? Older bootloaders used to wait about 8 seconds from reset for possible reprogram commands before launching the main code. I don't have a mega so I'm not sure if it ever had this old style bootloader but when your clutching at straws...
Almost remind me of the rare but repeatable DTR auto-reset 'lock-up problem' that that led to arduino adding the reverse biased diode from reset pin to Vcc on Rev3 boards, which 'fixed' that problem.
I have a Mega that looks like an real Arduino but, I suspect it is a clone. I have serial upload problems that do seem to be related to the DTR "lock-up" and sometimes when the upload is working, it freezes before the upload is complete.
I will try out the diode idea and the fuse change to see if it works. Currently, my board is almost unusable as I can rarely get a successful upload!