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HP Forums › HP Museum Forums › Old HP Forum Archives v
Reverse engineering the 12C+

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Reverse engineering the 12C+


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Scott Newell Offline
Unregistered
Posts: 107
Threads: 16
Joined: Jul 2007
#4
05-03-2010, 02:13 AM

I mapped out the display and keypad today, which was enough to get the 20B hex 4 banger project ported and running. No power management at all, yet.

I'm still fiddling with the LCD settings, but so far, so good.

My biggest failure was the debug UART--I simply couldn't get it to transmit. Ended up turning the CPU clock rate way up and bit-banging a 9600 baud output, which allowed me to decipher the display and keypad. (Probably something dumb that I forgot to configure, but it doesn't really matter now.)

Now for the tough parts...

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BruceH Offline
Unregistered
Posts: 275
Threads: 38
Joined: Jul 2007
#5
05-03-2010, 09:01 AM

According to the wiki there is an SDK that contains a simple 4-banger as an example. Does this not already have the keyboard mapped out?

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▼
Scott Newell Offline
Unregistered
Posts: 107
Threads: 16
Joined: Jul 2007
#6
05-03-2010, 10:02 AM

I don't have a 12C+ SDK, and it looks like I (probably?) won't need one. I enjoy figuring out the hardware.

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cyrille de Brébisson Offline
Unregistered
Posts: 193
Threads: 10
Joined: Mar 2008
#7
05-03-2010, 10:56 AM

hello,

do you want a SDK for the 12c+? it might make it easier...

Cyrille

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