O-Clock - Fixed!

I managed to fix the left-right mirroring of sparkfun's O-Clock on my cheap 'scope by tweaking the firmware.

 

I downloaded AvrStudio4,

WinAVR-20100110,

the source &

the uploader.

 

In AvrStudio I set Configuration options|Custom Options

gcc: C:\WinAVR-20100110\bin\avr-gcc.exe

make: C:\WinAVR-20100110\utils\bin\make.exe

 

Then make the following source changes

In ClkConfig.h edit:

#define ds1307 1 // Sparkfun Hardware

#define pcf8563 0 // Dutchtronix Hardware

 

and, at the bottom, add:

#define INVERT_X 1

//#define INVERT_Y 1

 

In ClkRender.s, look for DACXYPos and DACYXPos subroutines. Both have two parts like this

#if INVERT

neg r22 ; map [X/Y] origin

#endif

 

In each subroutine, change the first occurrence to #if INVERT_X and the second to #if INVERT_Y (even though the comment may mention the other coordinate).

 

Build, then follow Firmware upgrading instructions.

 

See the set.

Done