Rask Ingemann Lambertsen wrote: > On Wed, Aug 26, 2009 at 09:19:31PM +0100, Dave Ball wrote: >> Álvaro Lopes wrote: >>> I must confess I agree in priciple.... but this presents some other >>> problems - it has to be programmed either before or after assembly. >>> >>> And we do not use most of CPU pins, so we can use them just for now. >> I agree. I personally like having real HW revision detection so it's >> easy to change the board revision if/when mods are made to each of the >> prototypes with solder blobs, and visually confirm the revision. > > How about using the analog inputs ANx instead? We can encode several bits > per pin that way. Some of the SMD packages are large enough that resistor > values are printed on them.
If we discard the lower (error-prone) bits I think we can do it that way, yes... >> Maybe we should move it to GPA17/18 to avoid the EINTs, but we only >> really gain if we end up using those EINTs for something else... > [...] >> I've not dug into the datasheet, but would doing something with gpa0-8 >> be less risky? > > From the datasheet: "Port A(GPA): 25-output port". > >> Freeing up the camera port for IO might be nice, but I think I'd rather >> leave those lines as they are in gta02. Less mistakes for us to make! > > Then the gta02-core will be completely uninteresting for hardware > hackers. Notice how few DIY hardware projects have been made for the GTA01 > (after two years) or the GTA02 (after one year) - really just Werner's IDBG. > That's simply because they offer so little in the way of interfacing > hardware addons. This is a mistake I would like gta02-core to avoid. Understood, and agreed. > For an example of the problems DIYers are facing with the GTA02, at least > two people have looked into adding a camera to a GTA02[3] and half a year > later they haven't succeeded. That's disappointing considering that a 1.3 > Mpix camera module costs less than $10 [4] and has a relatively simple I2C + > 8-bit parallel interface. I wonder if we should get all unused pins in some FPC connector.... cost would not be so high, would it ? Álvaro _______________________________________________ gta02-core mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/gta02-core
