unable to use reset pin as gpio

[madblue]

Hi,

I am trying to use the p21 reset pin as gpio but it is not working as expected. it is showing a 3.3v even when i am trying to toggle the pin. I have removed the CONFIGURE GPIO PI AS RESET definition  from the makefile and the reset function is disabled. also tried disabling the reset configuration in systemnrf_52.c file.

nrfjprog --memrd 0x10001200 and 1204 gives 0xffffffff.

what else should i do other than disabling the CONFIGUREGPIOPIN AS RESETdefinition ?

I am using nrf52832(bc832 module) with sdk14.00, softdevice s132

[FormerMember]

The readout from UICR shows that no pin is set as reset pin.

How do you configure the gpio? Do you use the GPIO HAL?

[madblue]

Hi kristin,

when i removed the softdevice the gpio started toggling. seems the s132 was causing some issues. Does it work with softdevice?

but now there is a new issue, when i am trying to use this pin for twi its not working properly.ie.. i have connected it to sda line, as it was not working i have used a logic analyzer to view the communication and found that regardless of the what value i am trying to send, it only gives zero.

suppose if i try to write 0x57 to the slave, the values going out is only 0x00. clock and start conditions are going well. There is a 10k pull up connected to the sda line which i have removed as part of debug. it seems some kind of logic level issue is there with the pin.

fyi, the twi slave is working fine with a different gpio pin(02).

[hmolesworth]

In case you are using a development kit similar to the nRF52 dev kit the nRESET pin P0.21 is hardwired to an output on the SAM3 Segger interface via a solder bridge which may be cut. It's SB27 which may be causing the issue you see.

[hmolesworth]

If you have the BC832 dev kit my comment doesn't apply; I see that P0.21 only connected to a push-button on that board