NRF52833 unable to use reset pin (P0.18) as RESET?

[Neo Serdes]

Hi,

I have a custom EVB from Taiyo (EYSPBNZUA), https://www.yuden.co.jp/jp/product/category/module/img/TY_BLE_EYSPBNZUA_DataReport_V1_0_20201019E.pdf

When I press the RESET button, there is no response from the EVB. This reset button connects to P0.18. 

 

I read a few posts and get quite confused. Not sure how to configure the board to have this RESET pin functional?

Thanks,

Neo

[Kenneth]

What IDE are you using? Typically in the projects you can find a preprocessor definition: CONFIG_GPIO_AS_PINRESET

If defined, then this will for instance be handled in the system files to enable pin reset. Alternatively you may in command prompt simply type: 

You should install nrf command line tools to get nrfjprog.

[Neo Serdes]

I also installed the command line tool now. This command seems to function properly on the terminal. However, the reset button doesn't seem to do anything.

On serial port, each time reset I expect the terminal to get a hello message. Now I am only getting the message when I download the FW into EVB. 

This is the schematic of the EVB from Yuden: 

www.yuden.co.jp/.../TY_BLE_EYSPBN_EVBManual_V0_8_20200821.pdf

[Kenneth]

Hello,

I only have an nRF52832-DK to test with at the moment.

To make sure pin reset is enabled you can do the following (screenshot is for nRF52832-DK, so for the nRF52833 the pin reset value should be (pin 18=) 0x12, not (pin 21=) 0x15 as shown in the screenshot below.

Hope that helps,
Kenneth

[Neo Serdes]

I executed the below command and it returns a different value. It makes no difference on device behavior. 

 

$ nrfjprog --memrd 0x10001200 --w 32 --n 8

0x10001200: 00000010 00000010                     |........|

$ nrfjprog --pinresetenable

Enabling pin reset.

$ nrfjprog --memrd 0x10001200 --w 32 --n 8

0x10001200: 00000010 00000010                     |........|

Meanwhile, this command can reset the device properly. I can see the reset behavior. 

$ nrfjprog --debugreset

Applying debug reset.

[Kenneth]

Did you execute --eraseall first? For the nRF52833 the configurable pin reset is pin 18 => 0x00000012, it is not 16 => 0x00000010.

Kenneth