majenko:
Press the reset button just before the upload begins?
Tried that, but it didn't work.
Here is what I tried:
Connected the USB-cp2102 stick with the computer. Connected tx and rx with tx and rx on the Arduino Leonardo, and the GND and 5V with the Arduino ones.
In the Arduino IDE, I selected Board "Arduino Leonardo", Port selected the USB-cp2102 one, Programmer: AVR ISP.
Choose the Blink example sketch, hold the reset button on the Arduino, hit the upload button. After compiling released the reset button. But it just says Uploading... and nothing happends.
I also tried to switch the tx and rx lines, and also connected external power via usb at the arduino instead of the 5v from the usb-serial stick.
@pylon
Soo you mean, compile sketch I want to upload. Press the reset button, connect power to arduino, release reset and hit immediately the upload button?