[beagleboard] Negative voltage on GPIO

Hi to all, Can I use negative voltages such as input values on Blackbone green GPIO? (These values should be interpreted as 0 logic level) What is their minimum value? Could I apply -5V? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are

Re: [beagleboard] Negative voltage on GPIO

No. On Jul 26, 2017 5:12 AM, wrote: > Hi to all, > > Can I use negative voltages such as input values on Blackbone green GPIO? > (These values should be interpreted as 0 logic level) > > What is their minimum value? Could I apply -5V? > > -- > For more options, visit

[beagleboard] Process accounting resumed

Hi, periodically I've this message in my kernel. Does someone know what is it ? I found that: /* * Check the amount of free space and suspend/resume accordingly. */static int check_free_space (struct bsd_acct_struct

[beagleboard] Re: omap_i2c 48060000.i2c: timeout waiting for bus ready

This seems to be the hardware issue. I have the same error but after replace the board, everything works just fine. On Wednesday, July 29, 2015 at 12:45:38 PM UTC-7, Durwin wrote: > > > I used information from here > > > Everything went

Re: [beagleboard] RTC's SDA and SCL Resistors

Connect the pullup resistors to 3v3. Regards, John > On Jul 26, 2017, at 1:42 PM, William B wrote: > > Hi! > I'm installing a real-time clock (RTC) on Beaglbone Black and I'm seeing > divergent information abount hardware of the DS1307 integrated circuit, that >

[beagleboard] Re: RTC's SDA and SCL Resistors

John, I get it. But I do not know how it would be possible to do this in my DS1307 module which is of this type: http://www.ebay.com/itm/5-PCS-I2C-RTC-DS1307-AT24C32-Real-Time-Clock-Module-For-AVR-ARM-PIC-/172308340060?epid=846722400=item281e609d5c:g:VxcAAOSwawpXsn0J How would It connect to

[beagleboard] RTC's SDA and SCL Resistors

Hi! I'm installing a real-time clock (RTC) on Beaglbone Black and I'm seeing divergent information abount hardware of the DS1307 integrated circuit, that operates at 5V voltage, while the I2C IO buses of the BeagleBone operate at 3.3V. In the Adafruit RTC, they indicate removing the SCL and

Re: [beagleboard] RTC's SDA and SCL Resistors

Just to be clear, the Adafruit module has 2k2 resistors to 5V. These must be removed. However, the BBB still needs pullup resistors to 3v3. Regards, John > On Jul 26, 2017, at 1:42 PM, William B wrote: > > Hi! > I'm installing a real-time clock (RTC) on Beaglbone

Re: [beagleboard] RTC's SDA and SCL Resistors

OK, if you read the datasheet, you will see VIH = 2v2 and VIL = 0v8, which means the I2C signals are compatible with a 3v3 pullups. The module you referenced has pullup resistors to 5v0, which means they must be removed. There are voltage convertors from TI for I2C devices, but in this case

[beagleboard] recommendation for a symbolic debugger

I really need to have a symbolic interface to gdb running on my BBBs. Here is my situation. I keep build copies of the software on the BBB and compile them on the BBB. I edit them on my PC, keeping the masters in a local repo. I manually move them over after editing to compile them on the BBB.

[beagleboard] Re: RTC's SDA and SCL Resistors

Here is what I used: https://www.seeedstudio.com/Grove-High-Precision-RTC-p-2741.html I'm using the Greens so it conveniently plugs in to the Grove connector. The lithium coin cell was not available at the local stores and I had to order via Amazon. This device uses 3.3V battery and it is

Re: [beagleboard] recommendation for a symbolic debugger

Are you debugging user space app or kernel code like drivers, kernel modules, etc? If you are debugging user space app, you have two solutions: 1) use gdbserver on your BBB and Code Composer Studio (CCSV7) or Eclipse on your host, which uses gdb for debugging. You will need your BBB source code

[beagleboard] TrustZone support?

A security researcher friend asked me if BeagleBone supports ARM TrustZone. From what I can online, it seems that AM335x does not support it. Anyone know of a Sitara-based board that does support TrustZone? Thanks, Drew -- For more options, visit http://beagleboard.org/discuss --- You

Re: [beagleboard] RTC's SDA and SCL Resistors

I have 2 of them running here connected to BBGWs and performance is satisfactory so far. On Wednesday, July 26, 2017 at 7:48:18 PM UTC-4, john3909 wrote: > > This looks like a much better solution given that this module is powered > from 3v3. > > Regards, > John > -- For more options, visit