Ron Bean wrote: > Are the Beagleboard and the Gumstix Overo-Water similar enough that > the Beagleboard port is likely to run on the Overo? > > Maybe. The CPI is the same. The Beagle has a video interface, I'm not clear if the Gumstix boards have that. If not, just make sure that X11 doesn't try to load. > I'm disappointed in the small number of GPIO pins available on the > Beagleboard. Oddly, I haven't been able to find a straightforward > breakout board for the OMAP 3530-- they all seem to assume you want > everything *except* GPIO pins, despite the large number of them > available on the chip itself. > Yup, few people use bare GPIO, and the documentation, all 3700 pages of it, has the info but it is REALLY hard to figure out how to set up the GPIO pins to use them. They don't even bring out a byte-aligned 8-bit field of GPIO, you have to shift it over by 2 bits to find 8 in a row. The real kicker is that the GPIO is slow, 240 ns per access! You can theoretically access 32 GPIO pins at a time, but due to what is brought out, there are only about a dozen pins really available. Probably the best way to use the thing is to use an IIC controller and set up an FPGA to handle the protocol. It can do 32 MHz, so if you have larger blocks of data to move, that works well. > The Gumstix Overo-Water is pretty close, though. All pins are available > on a pair of *tiny* connectors (two rows of 35 pins in about 5/8", which > works out to about two pins per mm-- not sure if this can be soldered > without expensive equipment). And they have an expansion board with 60 > normal-sized header pins that has a lot of potential. Price is only > slightly higher than the Beagleboard. > Yeah, so you get less functionality for more $.
Jon ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
