I know this that when you try to program a pro mini without a DTR pin it will give you a error as the atmega needs to be reset during programming. So I had a doubt why does the microcontroller needs to be reset and clearly at which time you know at which moment does it reset ?
asked Apr 30, 2017 at 10:17
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1 Answer
A Reset is necessary to activate the Bootloader and allow programming. Without the DTR signal the Reset button has to be pressed just before starting the upload from the Arduino IDE.
answered Apr 30, 2017 at 10:24
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Is there any serial traffic before upload or is there anything like that the compiler sends any notification to the device. Commented Apr 30, 2017 at 10:39
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The compiler does not know about the upload. It is avrdude that does the upload. The reset is generated by pulling the DTR signal. Please see playground.arduino.cc/Learning/AutoResetRetrofit for more information about the auto-reset feature. Commented Apr 30, 2017 at 10:44
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If the software is somehow unable to send the reset signal then how could I create reset signal without manually pressing the reset button. Commented Apr 30, 2017 at 10:51
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What FTDI (USB-Serial bridge) are you using? Does it lack a DTR pin? Commented Apr 30, 2017 at 11:03
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Actually I don't really have a DTR pin I have only TX RX and GND pin. Commented Apr 30, 2017 at 11:35