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 <javascript:>> > 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 <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.
