I have problem with both custom boards and DEV board.
From a certain time after GPIO direction bit seems not effecting the pins.
To get rid of software factor, I all erase the flash and attach debugger, change register from it.
PIN_CNF[n]->DIR = 1
OUT->PINn = 1
The pin is still low (Should be High).
PIN_CNF[n]->PULL = PullUp
Pin goes High.
OUT->PINn = 0;
Pin still High.
PIN_CNF[n]->DIR = 0
Pin still High.
PIN_CNF[n]->PULL = 0
Pin goes Low.
I assume direction switching isn't working.
I don't know what caused this, but I have done specific sequence to it.
1. Download and debugging with J-Link
2. Target->Erase All (SES)
3. Download same firmware again (Same one as 1)
-> The pins which configured as output by firmware encounter the condition
I don't think erasing/programming with debugger or firmware can instantly damage GPIO pins.
But that's only I did to reproduce it.
I already did it to 3 custom boards and 1 Dev board.
Does any one know what actually happen to this ports and any chance to recover them?
I already tried "nrfjprog --recover", but doesn't help.
What was connected to the pins were:
PIN4: TWI_SCL (Pulled up with 10kohm)
PIN9: TWI_SDA (Pulled up with 10kohm)
PIN10: LED with 10kohm to VDD on custom borad (active low), Nothing connected on dev board.
SDK:v15.2.0
IDE: Segger Embedded Studio Mac
SoftDevice: s132
nRF52832 (MDBT42V-P512KV2 RayTac https://www.raytac.com/product/ins.php?index_id=65)
Debugger: J-Link Lite CoretexM
