@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, <[email protected]> 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 <[email protected]> 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, <[email protected]> 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, <[email protected]> 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, <[email protected]> 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, <[email protected]> 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 [email protected]. >>>>>>>>>>>>> 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 [email protected]. >>>>>>>>>>> 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 [email protected]. >>>>>>>>> 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 [email protected]. >>>>>>> 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 [email protected]. >>>>> 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 [email protected]. >>> 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
