BLE radio testing (TX continuous modulated)

Question

We are preparing for all of our radio compliance testing. Our board is inspired from the nrf9160dk design using the nrf9160 chip as the main controller and an nrf52840 flashed with hci_lpuart to function as the BLE passthrough controller. 
 For our testing we need to be able to put the unit into the following modes: 
 
 Receive Mode (RX) 
 Transmit Mode (TX continuous, modulated)
 
 3 channels (2402MHz, 2440MHz, 2480MHz) 
 Various data rates 125kbps, 500 kbps, 1Mbps, 2Mbps

I would like to support these tests from the nrf9160 firmware. I have no problem coding the ways to interact and set the different test modes. I am just unsure how instruct the nrf52840 BLE chip to run these settings. 
 I found the "radio_test" sample but from what I can tell it would take some serious modifications to make that work from the nrf9160 firmware. 
 I'm thinking this is achievable with "CONFIG_BT_EXT_ADV=y" and using the extended BLE capabilities. This would allow me to specify the channel/tx_power/etc... I'm not clear how to start a modulated transmission though. Are there any resources or pointers that could help with this? Am I on the right path going down the ext adv route? 
 Thanks.

Einar Thorsrud · Accepted Answer

Hi, 
 Yes, you can use RTT over SWD instead of UART. You can control it via RTT instead of UART by adding this to prj.conf: 
 CONFIG_SHELL_BACKEND_RTT=y 
 And adding an app.overlay file with this: 
 / {
	chosen {
 zephyr,shell = &rtt0;
 zephyr,console = &rtt0;
	};

rtt0: rtt_chan0 {
 compatible = "segger,rtt-uart";
 status = "okay";
	};
};

BLE radio testing (TX continuous modulated)

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