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16. 09 2010

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[13:35:05] <jarek> heya
[13:35:17] <jarek> i have a general ARM question
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[13:35:34] <Guest38676> errr
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[13:38:24] <jarek319> so yea
[13:38:30] <jarek319> I have a general ARM question
[13:38:39] <jarek319> I've been using atmel microcontrollers for a while
[13:38:54] <jarek319> and I was looking to upgrade to ARM
[13:39:14] <jarek319> I asked around for cheap devkits that integrate LCD's into their bundlke
[13:39:18] <jarek319> *bundle
[13:39:22] <jarek319> and someone brought up the zipit
[13:39:42] <jarek319> my project requires reading from an accelerometer and displaying a graph on the screen
[13:40:06] <jarek319> I already have this up and working on an Arduino, and I have experience programming on Linux computers
[13:40:18] <jarek319> so I was wondering, are the GPIO pins on the zipit easy to interface?
[13:40:40] <jarek319> I'd rather not use the serial link, as I'm trying to keep the accelerometer portion as light as possible
[13:40:56] <jarek319> so if there is an ADC or interrupt pin free on the Zipit core, I'd use that
[13:41:17] <jarek319> has anyone ever done a project using any of the GPIO pins on the zipit?
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[14:34:55] <ssieb> I haven't heard of anyone using them. I don't see why you couldn't. You would either have to wire directly to the board or find the connector for the back.
[14:35:36] <jarek319> the idea would be to wire it directly into the board; this isnt going to me a big production build, just a proof of concept
[14:40:55] <ssieb> should do the job then
[14:46:45] <Marex> jarek319: there's gazilion of GPIO lines on the back connector, they can all be configured as IRQ sources
[14:52:05] <jarek319> is there a reference for using these pins in a simple program written in C? e.g. datasheets with example code, or someone's source
[14:52:22] <jarek319> just a hello world with a button would be more than enough
[14:52:56] <jarek319> if (stateofGPIOpin = HIGH) printf "it works"; or something like that
[14:59:28] <ssieb> to get the pinout of the connector you have a sign something like an NDA. but you can probably just get the PXA270 datasheet and work from that
[15:08:58] <LokiChaos> I have a mostly complete cleanroom of the rear port (and some other pinouts) a friend of mine removed the chips and used the datasheets and a multi-meter to track the pins
[15:12:56] <Marex> LokiChaos: publish it then
[15:13:21] <Marex> jarek319: you'd better write a kernel-level driver for that ... or use gpio api (/sys/class/gpio, but then you dont get the interrupt stuff)
[15:13:43] <LokiChaos> k, I need to pester him for a more complete one, but the pinout thing he sent me (still only partial) I can post
[15:13:52] <LokiChaos> http://dpaste.com/244559/
[15:20:49] <jarek319> ah, that gives me a lot of info, thanks
[15:21:04] <jarek319> would I have to muck about with drivers and such?
[15:22:28] <jarek319> interrupts aren't really that important, as the program would poll for the data
[15:23:17] <jarek319> is there some source written that includes some functions from that API you mentioned?
[15:23:33] <jarek319> i'd like to get a look at it to make sure it's within my skill level before I drop 50 on a zipit
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[15:57:37] <ssieb> you could try to poll, it depends on the data rate and how you're using the pins
[15:58:01] <ssieb> just remember that you're using a multitasking os so you're likely to get interrupted for unknown periods of time
[15:58:41] * ssieb is not familiar with the gpio api as mentioned by Marex, so you might want to check that out
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