Power Cycling nRF52 - RESET Pin

[leehong]

Hi,

I'm developed a custom nRF52 board, and the main method to reset is via power cycling the power source (battery). Using GCC, should I still keep: CFLAGS += -DCONFIG_GPIO_AS_PINRESET and ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET in my makefile?

I've wired p.21 to my power source, but seems like the noise caused by power cycling made some peripherals not function because it works fine using the debugger connected (supposedly the debugger regulates the power).

Let me know of your thoughts..

[Hung Bui]

Hi LeeHong,

Could you explain a little more on what didn't work after reset ?

I don't really understand why you want to connect pin 21 as Reset pin (in the firmware with the makefile script) if you can only do reset by power cycling ?

[leehong]

Hi, My SPI Slave doesn't get properly initialized. My SPI slave triggers a GPIO pin 'high' on the nRF52 when data is going into the nRF52. Works when connected to via JLINK debugger, but doesn't work when unplugged from the JLINK and going a power cycle.

[Hung Bui]

Could you provide us your schematic and layout ? Also please let me know how do you configuration the GPIO interrupt pin ? Have you tried to manually trigger the interrupt and check if it's received on the nRF52 ?

If you don't configure the reset pin (disable it) would the issue still occur ?

You can send your schematic and layout via PM or you can open a case in our MyPage support system on our website.