This is an old revision of the document!


Winklepicker Reset Controller

Winklepicker

Winklepicker Reset Controller is a RS232 BREAK detector using either PIC12F1501 or PIC12F1571 micro-controller.

It has been designed specifically for the Oxford and Wellington boot loaders and it works in conjunction with the Easy-loader firmware upload utility.

Licence

Winklepicker Reset Controller is licensed under the GPL version 3.

Credits and Thanks

Winklepicker Reset Controller is developed by Darron M Broad.

Operation

Winklepicker monitors the serial Tx line between a host computer and a target device and will reset that device when a serial BREAK condition is detected.

This is used to enter the boot loader on the target, for firmware maintenance tasks.

Two modes of operation are available with Winklepicker. The mode is selected using a pin on the controller which is inspected as power-up.

Mode 1

The target device is reset after a BREAK condition is sent from the host with a duration of ~50ms. The target is taken out of reset when the BREAK condition ends.

This mode works with a large variety of UART devices which may only have Tx/Rx connections, some devices can be seen pictured above.

Mode 2

The RTS output of the host computer is routed to the target device reset input, under BREAK condition control.

Routing is enabled when RTS is low during a BREAK condition and disabled when RTS is high during a BREAK condition.

This mode can be used to simply reset the device or allow fine grained control of the reset pin for ICSP.

Demonstration

Here is an example configuration for the Oxford boot loader.

Winklepicker

Checkout

hg clone http://hg.kewl.org/pub/winklepicker
cd winklepicker
make
This website uses cookies. By using the website, you agree with storing cookies on your computer. Also you acknowledge that you have read and understand our Privacy Policy. If you do not agree leave the website.More information about cookies