Hey :) According to Derek Molloys header pin overview ( http://exploringbeaglebone.com/wp-content/uploads/resources/BBBP9Header.pdf ) some of the pins are used by the HDMI, but I have disabled that. It seems that all the eMMC pins are located on the P8 header. If this was the problem, I should be able to see the same problem when I set the values of all the GPIO to 1, even without putting the cape on, right?
Den mandag den 4. april 2016 kl. 17.58.17 UTC+2 skrev Chris Morgan: > > On Mon, Apr 4, 2016 at 11:53 AM, Martin Wiingaard <[email protected] > <javascript:>> wrote: > >> Hey There, >> >> I'm running BeagleBone Black Rev C. >> I have developed my own custom cape, it is using the following IO-pins: >> >> BBB-header no >> >> BBB GPIO no >> >> P9_42 >> >> 7 >> >> P9_18 >> >> 4 >> >> P9_17 >> >> 5 >> >> P9_15 >> >> 48 >> >> P9_28 >> >> 113 >> >> P9_23 >> >> 49 >> >> P9_31 >> >> 110 >> >> P9_12 >> >> 60 >> >> P9_29 >> >> 111 >> >> P9_27 >> >> 115 >> >> P9_25 >> >> 117 >> >> I have developed a device tree overlay, that's declaring all the pins as >> GPIOs, and I have set all pins to output with value 0. Other than that am I >> using the VDD_3V3 and VDD_5V. >> >> When I put the cape on, I get some error mesaages on dmesg: >> >> [ 159.482950] mmcblk0: error -110 sending status command, retrying >> >> [ 159.489379] mmcblk0: error -110 sending status command, aborting >> >> [ 159.495725] end_request: I/O error, dev mmcblk0, sector 497760 >> >> >> At this point I can still type in some simple commands to the commandline >> (such as ls and cd) but more demanding commands fails (such as top and >> shutdown), it gives me an I/O error. >> >> >> So it seems that the MMC-card for some reason is unreachable. The cape >> doesn't seem to affect the supply voltage, is was measured on VDD_3V3 >> (P9_3) to be 3,15V both before and after I put the cape on. >> >> >> Does anybody have any clues, or any suggestions to how I could do further >> debugging? >> >> >> Thanks :) >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > Are you sure none of those pins are being used by the emmc? It sure sounds > like they might be... > > Chris > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
