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I am trying to program an ATMega32u4 microcontroller through arduino IDE. I have added external oscillator(16Mhz) and capacitors and few other connections according to the Schematic. I had put a sparkfun bootloader onto it(caterina) using Avr Pocket Programmer. A usb 2.0 is connected to the microcontroller. Arduino IDE recognizes microcontroller as Arduino Leonardo with the help of this usb. Bootloader file.

I was able to upload codes into the microcontroller but the issue is, I have to put the reset pin to ground momentarily each time when the IDE goes to uploading stage. If i do not reset it, the COM Port for leonardo disappears but it never comes back until I reset it manually and therefore the uploading bar just gets stuck. I have also added the circuit connected to the Reset Pin according to the schematic but even if i remove all of it and just connect a switch, no difference can be observed. No power on reset is working.

Since one can upload codes without having to manually reset each time in Arduino Leonardo, I was wondering what could be the issue here.

Is there a way to auto reset this? Or perhaps fix the auto reset issue in this case? enter image description here

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  • how is it done on rhe Leonardo? – jsotola Jul 25 '19 at 10:51
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    How is what done on the leonardo? I'm sorry, I didn't get your question. – NaNN Jul 25 '19 at 11:37
  • did you look at the Leonardo schematic? – jsotola Jul 25 '19 at 16:22
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    Yes, I did. Also rigged the circuit connected to the reset pin but it doesn't seem to be working. Any idea what could be wrong? – NaNN Jul 26 '19 at 6:54
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    Yes, I did try that and it works. However, I would need to do that while uploading the code quickly, else the code won't upload. Again, it's not exactly an automated thing. – NaNN Jul 30 '19 at 12:21

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