cannot pair or advertise HID profile once I toggle gpio pin no. 25 or 26 of nRF52832_WLCSP

[Idan]

To whom it may concern,

I use a BLE app via nRF52832_WLCSP, 'ble_app_hids_keyboard' of SDK11(pca10040),SD s132_nrf52_2.0.0, with the HID profile. once I started advertising BLE and then I toggle gpio pin no. 25 or 26 as a SPI 'chip select' outputs for peripherals(accelerometers) I cannot pair with my central(IOS or Android phones). BLE scanner apps do not show any signs of receiving RSSI data. I must use these exact gpio pins. other gpio pin like 27 or 17 cause nothing alike.

If I start advertising BLE, pair and then I toggle these gpio pins; I can transmit data without any problem noticed.

In the past I used the same app with 'nRF52832_QFN48' I encountered no such problem.

What might be wrong?

Idan

[Hung Bui]

@Idan: I suspect for some reason the chip crashed. Have you check if it's still operate ? any assertion ? You can have a look at this guide for debugging here.

[Idan]

the point is that there are no hard or soft restarts. everything else is smooth, except of advertising while toggling these pins. I do not use or should use the scheduler because delays and waiting time does not fit my app. can these pins somehow affect the SD 132??

[Hung Bui]

Hi Idan,

Please clarify: you started advertising, it worked. Then you toggle the GPIO pin, then the advertising stopped ? Everything else still worked (you can blink an LED for example) ?

If you narrow down the issue with just the toggle of the pin and nothing else and you can base on our example with minimum modification so we can track what could be wrong.

[Idan]

Hi Hung,

when I just toggle these gpio pins and insert a time delay of 1[us] I encounter the same problem. every other chip action is operatable, including toggling other CS gpio pins just a same as these aforementioned. when I insert a larger delay(50[us] or 100[us]) I do not encounter this problem. it works also with scheduler, but the app has different necessities that the scheduler could not be used. does the radio have

[Hung Bui]

This must be related to smth else. Again ,Please clarify: you started advertising, it worked. Then you toggled the GPIO pin, then the advertising stopped ? Everything else still worked (you can blink an LED for example) ?

When you toggle the CS pin, did you do anything else , with SPI for example ?

[Idan]

I use the SPI for three other accelerometers with other CS's. they work great, including advertising and leds lightning. it is written in the user manual that: "Radio performance parameters, such as sensitivity, may be affected by high frequency digital I/O with large sink/source current close to the radio power supply and antenna pins.". we used the gpio pins - 25 and 26 as recommended for nRF52832_WLCSP: B3 P0.25 D3 P0.26

and other gpio pins as CS's that works well with advertising: B4 P0.27 A4 P0.29 H2 P0.18

the problematic IO's are not located next to the NFC or radio IO's.