Key exchange

Hi,

I have just repaired a Canon G12 (lens) but the func/set key do not work anymore.
I can still take pictures but I sometimes need to use the func/set key to make changes...

So, I wonder if I could modify the chdk source code to exchange my func/set key with another one that I use less often.
I manage to configure the autoboot of chdk (mendatory to use chdk that could not be manually load without the func/set key...)

After some try to modify some kbd files and compilling the modified sources I did not manage to exchange the keys as expected.

But considering the various kbd files I found in the sources, I certainly did not modified the right one.

Could someone give me a hint of the file (files?) I have to modify ?

Thank you in advance,

AA

So, I wonder if I could modify the chdk source code to exchange my func/set key with another one that I use less often. I manage to configure the autoboot of chdk (mendatory to use chdk that could not be manually load without the func/set key...)  After some try to modify some kbd files and compilling the modified sources I did not manage to exchange the keys as expected.

The file you want is kbd.c in your G12's chdk/platform/g12 folder.   Modify the function kbd_fetch_data() so that it checks for the bit associated with the key you want to remap in the key array pointed to by *dst,  masks that bit if  its found,  and then set the bit for the FUNC/SET button instead.    The keymap[] structure in kdb.c will tell you the necessary bits and offsets.

Thank you for your answer.

In fact, I did try to modify the kbd.c file.
But (certainly because of my misknowledge) it did not worked.

I was thinking of replace the KEY_SET by the KEY_METERING.
So I exchange the 0x00002000 values.

Is it the move that had to be done ?

Could you give me an example, if not ?

Thank you aggain,

AA

Unless someone jumps in here today pointing out a mistake, I'll code this and test tonight.

It is very kind of you.

Thank you.

AA

It is very kind of you. Thank you. AA

Tested this on my G10 (with suitable mods for the different keymap).  This version should work for your G12.

#define KMETER 0x00040000
#define KSET   0x00002000

void kbd_fetch_data(long *dst)
{
    _GetKbdState(dst);
    _kbd_read_keys_r2(dst);
    if ((*dst & KMETER)==0) *dst = (*dst|KMETER) & ~KSET ;   
}


Works well.

Well done !
It is working !
Thank you very much.

I could not have found the "void" part.

I have lost my metering key but it is a price to pay 

AA

I have lost my metering key but it is a price to pay 

There is a way to fix that too.  Just change the code so that a short press of the metering button is treated as a metering button press,  and a long press (i.e. press & hold) of the metering button is treated as a Func/Set press.

Modify the patch you made to start a counter that increments while the metering key is pressed.  When the key is released, check the value of the counter.  If it's below a certain value then simulate a press of the metering key.   If it's above that value, simulate the press of the Func/Set key.

It is a very good idea.

I will check the doc to see if I can write that kind of code.

Thank you.

AA

It is a very good idea.

I will check the doc to see if I can write that kind of code.

A hint: kbd_fetch_data() is called once in every 10 milliseconds.