Yes of course. I added this option just to run the cape for first tries on a USB port.
Could you find any other problems? I am currently thinking to connect the SYS_RESETn of the BBB directly to the reset pin of the atmega`s? Am Montag, 15. September 2014 23:06:09 UTC+2 schrieb Gerald: > > Looks like you have shorting posts for your standalone versus cape mode. > If you ever by accident plug in the standalone mode into the BBB, then you > will damage the board for sure. > > Gerald > > > On Mon, Sep 15, 2014 at 3:51 PM, ulli <mitterma...@gmail.com <javascript:> > > wrote: > >> >> You are right, there must be something wrong but I do not know what. >> I understood that the blocking capacitor is missing. But I do not know if >> that is the only mistake and this is the reason why my beagle stopped >> working because of my cape.... >> >> I updated the circuit to that configuration like it is when I have it >> connected to the beagle. >> >> https://drive.google.com/file/d/0B8Fq4yYMgG7uTFlIRjdjcGRUYlE/edit?usp=sharing >> >> >> Am Montag, 15. September 2014 22:32:54 UTC+2 schrieb Gerald: >>> >>> So your contention is that this is all correct? Do I read you right? >>> >>> Gerald >>> >>> >>> On Mon, Sep 15, 2014 at 3:24 PM, <mitterma...@gmail.com> wrote: >>> >>>> Thanks for your quick answer and very helpful feedback! >>>> >>>> I am not sure if I understood right. >>>> >>>> Currently I have to options to power the cape. >>>> 1. Use the cape without the Beagle >>>> --> Power supply over the FTDI connector and solder header Pin2-Pin3 >>>> connected on the MCP1703 side. >>>> --> 5V solder header Pin1-Pin2 connected >>>> --> 3,3V will be generated with the MCP1703 from the input voltage >>>> VIN >>>> >>>> 2. Use the cape with the Beagle >>>> --> Power supply all over the beagle headers and solder header >>>> Pin1-Pin2 connected on the MCP1703 side. Therefore no voltages will be >>>> generated by the cape itself... >>>> --> 5V solder header Pin2-Pin3 connected. 5V from the beagle. >>>> --> 3,3V from the beagle >>>> >>>> Therefore the atmega`s can only power up when the 3.3v supply of the >>>> header is available. >>>> The 5v supply is always on thats right. But 5v is only used for LED`s >>>> and the Piezo Buzzer and this parts are >>>> disconnected with a BC817 from ground. >>>> >>>> Yes all wires which are named as GND are connected. >>>> >>>> Do you really see an issue on that? What needs to be changed? >>>> >>>> Am Montag, 15. September 2014 21:56:47 UTC+2 schrieb Gerald: >>>>> >>>>> Your regulator must be turned off until the VDD_3V3 rail comes up. >>>>> Right now it comes up almost immediately as it is powered from either the >>>>> expansion header or a weirdly designed 5V DC input. The idea of gating >>>>> the >>>>> ground to control power will not work as you already have a DC path to >>>>> ground, assuming that all of your grounds are connected together as >>>>> they should be. >>>>> >>>>> Gerald >>>>> >>>>> On Mon, Sep 15, 2014 at 2:45 PM, <mitterma...@gmail.com> wrote: >>>>> >>>>>> Oh I understood, I need to add the C1 on each Atmega 3V3 supply. --> >>>>>> blocking >>>>>> <https://dict.leo.org/ende/index_de.html#/search=blocking&searchLoc=0&resultOrder=basic&multiwordShowSingle=on> >>>>>> >>>>>> capacitor >>>>>> <https://dict.leo.org/ende/index_de.html#/search=capacitor&searchLoc=0&resultOrder=basic&multiwordShowSingle=on> >>>>>> But could that really be the issue which stopps the BBB running. I >>>>>> can also not boot the beagle up when I have removed the cape. >>>>>> When I want to boot up the beagle alone the power led flashes up one >>>>>> time...and thats it.... >>>>>> >>>>>> Am Montag, 15. September 2014 21:29:20 UTC+2 schrieb Gerald: >>>>>>> >>>>>>> IC1. Your regulator. >>>>>>> >>>>>>> Gerald >>>>>>> >>>>>>> On Mon, Sep 15, 2014 at 2:17 PM, <mitterma...@gmail.com> wrote: >>>>>>> >>>>>>>> What do you mean with C1? >>>>>>>> >>>>>>>> Am Montag, 15. September 2014 21:08:59 UTC+2 schrieb Gerald: >>>>>>>>> >>>>>>>>> Looks like C1 is not gated by the 3.3V rail from the >>>>>>>>> BBB connectors. >>>>>>>>> >>>>>>>>> >>>>>>>>> . >>>>>>>>> Gerald >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Sep 15, 2014 at 1:54 PM, <mitterma...@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> Hello all, >>>>>>>>>> >>>>>>>>>> I urgently requesting your support! I am desperate! >>>>>>>>>> I am currently developing a radio cape which has two Atmega328p, >>>>>>>>>> 3xRFM69 radio modules and some other small things on it. You can >>>>>>>>>> find the >>>>>>>>>> circuit in the following link: >>>>>>>>>> https://drive.google.com/file/d/0B8Fq4yYMgG7uQ3k3WkJUbG9icWs/ >>>>>>>>>> edit?usp=sharing >>>>>>>>>> >>>>>>>>>> When I use this cape on by BBB, the Beagle stopped working during >>>>>>>>>> operation. I tried to reboot it but it now do not boot up like the >>>>>>>>>> issue >>>>>>>>>> described in the Beagle Wiki as "Improper Power Down". I never >>>>>>>>>> unplugged >>>>>>>>>> the power cord from the board. It just stopped working. >>>>>>>>>> When the cape is connected to the beagle the components are >>>>>>>>>> sourced by VDD_3V3Exp and VDD_5V. So no external power supply. I >>>>>>>>>> additionally just have the Uart4/5 connected to my circuit.... >>>>>>>>>> >>>>>>>>>> I would really appreciate your help. Because I really do not >>>>>>>>>> understand what the matter is! >>>>>>>>>> >>>>>>>>>> THANKS A LOT! >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> 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 beagleboard...@googlegroups.com. >>>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>> 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 beagleboard...@googlegroups.com. >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> >>>>>>> >>>>>>> -- >>>>>> 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 beagleboard...@googlegroups.com. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> -- >>>> 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 beagleboard...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >> 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 beagleboard...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
