Kbd availability on boot - General Discussion and Assistance - CHDK Forum
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Kbd availability on boot

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Offline jeff666

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  • A720IS
Kbd availability on boot
« on: 08 / December / 2007, 08:06:28 »
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Hi,

one of the first things I tried with my A720 was to read the keyboard button state to get some minimal interactivity during my tests.

Unfortunately the address never changed its content.

In a loop I read 0xC0220200, -04 and -08 as indicated in CHDK.

The memory region doesn't seem to have changed since the A720 Firmware reads them, as well. See:

Code: [Select]
ROM:FFC37034 GetKbdState                             ; CODE XREF: sub_FFC130CC+24p
ROM:FFC37034                 LDR     R1, =0xC0220000
ROM:FFC37038                 LDR     R2, [R1,#0x200]
ROM:FFC3703C                 STR     R2, [R0]
ROM:FFC37040                 LDR     R2, [R1,#0x204]
ROM:FFC37044                 STR     R2, [R0,#4]
ROM:FFC37048                 LDR     R1, [R1,#0x208]
ROM:FFC3704C                 MOV     R1, R1,LSL#16
ROM:FFC37050                 MOV     R1, R1,LSR#16
ROM:FFC37054                 STR     R1, [R0,#8]
ROM:FFC37058                 BX      LR
ROM:FFC37058 ; End of function GetKbdState

Now I wonder if the keyboard needs some initialization?

Cheers.
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