Setting gpio ports as outputs and setting them to Vdd

RE: Setting gpio ports as outputs and setting them to Vdd

Benjamin Willis — Tue, 09 Oct 2018 23:38:02 GMT

Sorry for being absent for so long. The image that you provided gives me the same result that I was getting with my own code above. Also, I have tested on two different boards with identical design, and they all behave identically. So I think that's enough to conclude that the hardware is the issue. Thank you for your help!

RE: Setting gpio ports as outputs and setting them to Vdd

Vidar Berg — Tue, 28 Aug 2018 08:40:01 GMT

I don't think the issue is related to your FW code then. You may program attached .hex file if you want to confirm the behavior with a different FW image. It toggles pin 6 and 7 at 1 s interval using SW delays like you did in your code. I've tested it on a DK.

nrfjprog --program pin_toggle_w_softdevice.hex --chiperase -r

devzone.nordicsemi.com/.../pin_5F00_toggle_5F00_w_5F00_softdevice.hex

Do you have more than one board to test this on? In case it is a hw issue.

RE: Setting gpio ports as outputs and setting them to Vdd

Benjamin Willis — Mon, 27 Aug 2018 19:04:44 GMT

I have made sure to set the SPI and TWI pins away from Po.06 and Po.07, so that's not an issue. The two pins 6 & 7 are actually controlling the gates of MOSFETs, and those MOSFETs get their power from the bus. The MOSFETs are essentially on/off switches for the LEDs. So it's not a current issue either.

RE: Setting gpio ports as outputs and setting them to Vdd

Vidar Berg — Mon, 27 Aug 2018 14:00:51 GMT

Hi,

I don't see anything in your code that can override the IO configuration (SPI,TWI,etc). Do you know what the max. sink/source current in your case, and is it the same for both LEDs? If needed, you can change the drive strength in the GPIO pin configuration (GPIO spec.)