Mac OSX Arduino with FTDI: upload only works once per USB plug/unplug

Development Tools IDE 1.x
1

I have this arduino Duemillanove with FTDI chip. It works fine on my PC. I uploaded code several times in a row. No problem. I updated the bootloader to UNO/optiboot a long time ago. But when I am using in on my Mac OSX, it only works once per USB plug/unplug. After first upload, the code works and I can open serial port on my Mac and see data printed to the monitor. But, I just can't upload a second time without disconnecting it and connecting it again. There is nothing connected to it.

Any idea what I may have not done to make it work?

2

What's the error?

You might drop to a terminal and do "lsof | grep usbserial" and see if avrdude (or another process) is grabbing the serial port.

3

If it's the same problem I'm having, AVRDUDE lowers RTS to reset the Arduino, but never raises it again, so next time it doesn't work.

I also have an older computer that had Arduino 1.6.1 that works normally, and updating to 1.6.5 also works. Newer computer that only had 1.6.5 doesn't.

4

Thanks guys. I've not touched the computer since then. I am using Arduino 1.6.5-r5 and the error was not in sync. I'll take another look. Last time I tried to log on it is frozen (updated to el capitan).