My question (before we jump into CAN or anything else) is, "What nodes need to talk to each other if the flight computer goes down?"
If the flight computer is down, the goal should be to get the rocket to the ground safely. I don't think there's much point in trying to use CAN to log data. Given the goal of a safe landing, what nodes *really* need to talk to each other? If it turns out that only two nodes need to talk to each other, why bother with CAN? Why not just run one serial connection between the two? I'm concerned that we're adding too much complexity for what should be a really simple backup system. Sarah On Sun, Feb 1, 2009 at 12:07 PM, Dave Camarillo <dave.camari...@gmail.com> wrote: > Hi All, it looks like Denx does have drivers for the CAN hardware on > the 5200. It appears to be a derivative work of Peak Systems > (http://www.peak-system.com) PCAN software. I skimmed the source code > and they have a driver that hooks the PCAN driver (they also support > devices such as the SJA1000 chip and a couple other products from > peak-system). The include in the source tree a command line app for > transmitting and receiving messages as well. > > Based on skimming the source code and looking at the pcan web site it > appears to support 2.4 and 2.6 kernels, and the peak site indicates > that they support the PF_CAN (SocketCAN) stuff built into newer > kernels. > > I'm wondering, maybe Josh/Jamey could bring the flight computer on > tuesday and maybe we can play with this a little? > > http://www.denx.de/en/view/Software/WebHome#Linux_Device_Drivers > http://www.peak-system.com/fileadmin/media/linux/index.htm > > > Thoughts? > > Regards, > -Dave > > > > On Sun, Feb 1, 2009 at 5:58 AM, Andrew Greenberg <and...@psas.pdx.edu> wrote: >> We've looked a bit at our schedule for the capstone, and the decision >> between CAN and a UART backchannel really, really, really have to be >> made in the next three weeks. >> >> To even consider CAN as a backchannel, we have to have the MPC5200 talk >> CAN on its native CAN peripheral. That means digging up Denx's MPC52000 >> CAN peripheral drivers and actually seeing them work, and testing them a >> bit. >> >> We'll talk about this more on Tuesday, but I just wanted to warn >> software folks - I guess mostly Dan and Dave here - that we need to know >> stuff, soon. We'll have the MPC5200 FC at the next meeting for you to >> play with, and I'll bring my CAN2USB adapter. >> >> Andrew >> >> -- >> ------------------------------------------------------- >> Andrew Greenberg >> >> Portland State Aerospace Society (http://psas.pdx.edu/) >> and...@psas.pdx.edu P: 503.788.1343 C: 503.708.7711 >> ------------------------------------------------------- >> >> _______________________________________________ >> psas-avionics mailing list >> psas-avionics@lists.psas.pdx.edu >> http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics >> > > _______________________________________________ > psas-avionics mailing list > psas-avionics@lists.psas.pdx.edu > http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics > _______________________________________________ psas-avionics mailing list psas-avionics@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-avionics
