HP Forum Archive 19

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Reverse engineering the 12C+ Message #1 Posted by Scott Newell on 3 May 2010, 2:13 a.m. 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...

Re: Reverse engineering the 12C+ Message #2 Posted by BruceH on 3 May 2010, 9:01 a.m., in response to message #1 by Scott Newell 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?

Re: Reverse engineering the 12C+ Message #3 Posted by Scott Newell on 3 May 2010, 10:02 a.m., in response to message #2 by BruceH I don't have a 12C+ SDK, and it looks like I (probably?) won't need one. I enjoy figuring out the hardware.

Re: Reverse engineering the 12C+ Message #4 Posted by cyrille de Brébisson on 3 May 2010, 10:56 a.m., in response to message #1 by Scott Newell hello, do you want a SDK for the 12c+? it might make it easier... Cyrille

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