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Topic: Serial to Mega2560 (Read 533 times) previous topic - next topic

Gibson486

I am trying to by pass the USB to serial converter chip on the 2560. I see lots of tutorials on how to do it with uno, but I am trying to do it with the 2560. I desoldered RN4 from the board (next to RX LED) and C7 (next to RESET-EN). HOwever, it does not seem to work. I rebuilt the MAX232 (and a I even tried a MAX202) several times. It is still a no go. Am I missing something? It just blinks like it is not even receiving a signal at all.

PaulS

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I am trying to by pass the USB to serial converter chip on the 2560.

Why? Only one of the 4 hardware serial ports (Serial) goes through the USB to serial converter. The other three (Serial1, Serial2, and Serial3) do not.


Gibson486

Well, I wanted to upload the programs via serial. I essentially just copied how it was done on Unos. I did not really think about the fact that the 2560 has 4 ports while the Uno has one, which is the reason why people bypassed that USB to serial chip on Unos to begin with. I really do not have to bypass the serial, I guess. Either way, I still cannot get it to upload the program with the arduino IDE....

PaulS

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Either way, I still cannot get it to upload the program with the arduino IDE....

Did you solder the resistor and capacitor back on?

Gibson486

Yes, but I still just trying to upload via the ports now....All I have to control is the reset and the 2 serial pins, right?

PaulS

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Yes, but I still just trying to upload via the ports now

Which port(s) The bootloader only listens to one of the serial ports (Serial/RX and TX).

Gibson486

I got it working....

turns out that the schematic in the datasheet (MAX 202) is not right for what I needed it for. The cap on pin 2 is shown with the neg side going to the supply. I brought it to ground instead and now it works. That was frustrating.

thanks!

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