nRF52840 BLE 3-Wire PTA for Wi-Fi

Question

Hello DevZone, 
 I'm developing nRF52840 BLE & ESP32 Wi-Fi coexistence with 3-Wire PTA. I followed this document: https://docs.nordicsemi.com/bundle/ncs-2.5.3/page/nrf/device_guides/wifi_coex.html#generic_three_wire_coexistence 
 However, the NCS only support generic 3-wire PTA for OpenThread. So, I decided to write my own PTA code. 
 I modified `peripheral_uart` example. Added my code (with MPSL CX API). 
 The MPSL code is not difficult to understand. I referred to nrf/subsys/mpsl/cx/thread/mpsl_cx_thread.c 
 and nrf/subsys/mpsl/cx/nrf700x/mpsl_cx_nrf700x.c . 
 You can check my code as attached. 
 1488.peripheral_uart.7z 
 If you want to run this code, use NCS 2.5.3. And add the following Kconfig chioce to MPSL_CX_CHOICE in nrf/subsys/mpsl/cx/Kconfig 
 config MPSL_CX_BT_3WIRE
 depends on SOC_SERIES_NRF52X
 select NRFX_GPIOTE
	select GPIO
	select NRFX_TIMER1
	bool "Bluetooth Radio 3-Wire Coexistence" 
 The problem is that the BLE activity is not controlled by the GRANT pin 
 No matter how I change the GRANT pin, the BLE connection is always good. And it never controls the REQUEST pin and PRIORITY pin. 
 
 Best regards, 
 Jayant

Amanda Hsieh · Accepted Answer

Hi, 
 For now, you can use the following workaround: 
 
 Add CONFIG_BT_LL_SOFTDEVICE_MULTIROLE=y to prj.conf - this is required as coex is not included in the peripheral library, and currently this is not correctly getting selected automatically when coex is enabled. 
 Remove the line depends on !BT as the customer has already done, and use CONFIG_MPSL_CX_THREAD=y 
 
 The developer has tested this locally and it works on our side, note enabling the multirole library is required for coex to work. This will not build as-is on NCS latest due to a regression, but is fine on 2.5.3. Will be fixed soon and will be part of NCS 2.8. 
 -Amanda H.

nRF52840 BLE 3-Wire PTA for Wi-Fi

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