Winklepicker Reset Controller is a reset controller for the Oxford and Wellington boot loaders. It works in conjunction with the Easy-loader firmware upload utility.

In operation, Winklepicker monitors the serial TxD line between the host computer and the boot loader target device and will reset the device when a serial BREAK condition is present.

Two modes of operation are available with Winklepicker. In mode one, the target is reset after a BREAK condition exists for ~50ms and taken out of reset when the break condition ends. In mode two, the target reset pin is connected to an input, Eg. RTS or DTR when pass-through mode is entered and disconnected when left. Pass-through mode is enabled when the input is low at the end of a break condition and disabled when the input is high at the end of a break condition.

The first mode is the simplest and works with a large variety of UART devices, such as those pictured. The second mode is to allow more control of the reset pin (for example, with ICSP). Either mode is selected using a pin on the reset controller which is selected when the controller is reset.

Here is an example configuration for the Oxford boot loader.

Check-out

hg clone http://hg.kewl.org/pub/winklepicker/