Trinket requires reset before every upload

[ocdee]

Hi,

I have an Adafruit Pro Trinket - 5V 16MHz
connected to a
Bluefruit EZ-Link - Bluetooth Serial Link & Arduino Programmer - v1.3

I can successfully upload sketches via bluetooth but find that I need to press the reset button on the Trinket every time I want to upload a sketch. If I don't I get the following error from in the Arduino IDE...

"avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)"

Any thoughts on how to fix this?

[adafruit_support_mike]

That's how the Trinket works.

The Trinket doesn't have any USB hardware, so you have to do a physical reset to launch the bootloader, which then emulates a USB connection long enough to download the firmware. That's why it's so small and only costs $7.

[hiduino]

If you are uploading using the EZ-Link Serial to the Trinket Pro FTDI interface then it should automatically be triggering the bootloader. Do you have all six wires between the EZ-Link and Trinket Pro FTDI interface? The EZ-Link DTR pin should be going to the RST pin on the Trinket Pro, which should normally trigger the bootloader.

[nizer]

did this ever get fixed?

[adafruit_support_mike]

There wasn't anything to fix. That's the designed behavior.