It has to be HW or the application and use of the hardware. Maybe you have a short or some other issue with your assembly.
Gerald On Tue, Sep 16, 2014 at 11:13 AM, Ulli <mittermaier.u...@gmail.com> wrote: > @Gerald: What else can be wrong except the hardware design? > > Am Montag, 15. September 2014 23:25:11 UTC+2 schrieb Ulli: > >> >> I am not sure what you mean with "to disable the buffer before until you >> come up". >> Directly connect the Beagle SYS_RESETn pin to the pin 29 of the Atmega`s? >> >> What would be the positive effect by using the SYS_5V. I think it is >> directly connected to the Beagle DC plug. So, it can drive more current? >> >> Two more ideas: >> * would it be helpful to add a 0,1µF capacitor to the beagle voltage >> supply pins on the header, between VDD_3v3 and Gnd very close to the beagle >> headers? >> * would it be better to completely supply my cape from SYS_5V and create >> the 3v for the Atmegas and the other components on the cape with the >> MCP1703? >> >> Am Montag, 15. September 2014 23:14:45 UTC+2 schrieb Gerald: >>> >>> Nothing else jumps out at me. The 5V rail you are using is on before >>> the board is powered up, but I don't think that should matter. You could >>> switch to SYS_5V, no reason not to.As you only have four wires to the BBB, >>> you might try adding some isolation there, and use the RESET signal to >>> disable the buffer before until you cone up. >>> >>> There may be something else in your setup. But, schematic wise >>> I don't see anything else. >>> >>> Gerald >>> >>> >>> On Mon, Sep 15, 2014 at 4:09 PM, <mitterma...@gmail.com> wrote: >>> >>>> 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> 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. >>>>>> 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+unsubscr...@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. 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