You are here: start » projects » winklepicker

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
projects:winklepicker [2017/02/18 00:33] – [Winklepicker Reset Controller] darronprojects:winklepicker [2019/09/09 16:16] (current) – [Operation] darron
Line 4: Line 4:
 </wrap> </wrap>
  
-Winklepicker Reset Controller is a serial reset controller for the [[:projects:oxford|Oxford]] and [[:projects:wellington|Wellington]] boot loaders. It works in conjunction with the [[:projects:easyloader|Easy-loader]] firmware upload utility.+Winklepicker Reset Controller is a RS232 BREAK detector using either a PIC12F1501 or PIC12F1571 microcontroller. 
 + 
 +It has been designed specifically for the [[:projects:cowboy|Cowboy]], [[:projects:oxford|Oxford]] and [[:projects:wellington|Wellington]] boot loaders and it works in conjunction with the [[:projects:easyloader|Easy-loader]] firmware upload utility.
 === Licence === === Licence ===
  
Line 15: Line 17:
 === Operation === === Operation ===
  
-Winklepicker monitors the serial Tx line between the a host computer and a target device and will reset that device when a serial BREAK condition is detected.+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.
  
-Two modes of operation are available with Winklepicker.+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 at power-up.
  
 ==Mode 1== ==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. 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 in the picture above.
  
 ==Mode 2== ==Mode 2==
Line 27: Line 33:
 The RTS output of the host computer is routed to the target device reset input, under BREAK condition control. The RTS output of the host computer is routed to the target device reset input, under BREAK condition control.
  
-Routing is enable when RTS is low during a BREAK condition and disabled when RTS is high during a BREAK condition. +Routing is enabled when RTS is low during a BREAK condition and disabled when RTS is high during a BREAK condition.
- +
-Mode 1 is the simplest and works with a large variety of UART devices, such as those pictured. The second mode is to allow fine grained control of the reset pin (for example, with ICSP).+
  
-Either mode is selected using a pin on the controller which is loaded during controller start up.+This mode can be used to simply reset the device or allow fine grained control of the reset pin for ICSP. It has also been designed to allow RTS to perform regular serial duties when not routed through to the target reset pin.
  
 === Demonstration === === Demonstration ===