External antenna J1 insert connector in nRF52833-DK

[ian_student]

Hello! I use EK42423-03 and 52833-DK

Previous case 

I understand plugging in the SWF connector, Will disconnecting from the PCB antenna and routing the signal to the cable.

EK42423-03-Datasheet

LS ->GND ; CTRL -> P0.26 ; GND -> GND ; VDD -> VDD ; J1 RFC -> J1 ANT 

First follow this pic.

I added code in nrf52833dk_nrf52833.dts

    ant1: ant_1 {
			gpios = <&gpio0 26 GPIO_ACTIVE_LOW>; /*CTRL*/
			label = "ANT 1";
	};

Using multimeter can measure from RF2 to Refer to the pic.

RF1 = 0Ω 

RF2 = 20Ω 

But why? EK42423-03 "J1"  insert 52833-DK "J1" After Refer to the pic.

RF1 = 0Ω 

RF2 = 0Ω 

I do not know what is causing.

Sorry, it's been two months and I still can't do it...

But I still hope you can give me advice!

Thanks again for your support.

[ian_student]

HI.

I want to improve

Query case

I can find the code

NRF_RADIO->PSEL.DFEGPIO[0] = 0x00000011; //(P0.17)
NRF_RADIO->SWITCHPATTERN = 0x0; // before CTE - antenna 1
NRF_RADIO->SWITCHPATTERN = 0x0; // reference - antenna 1
NRF_RADIO->SWITCHPATTERN = 0x0; // slots 0, 2, 4... - antenna 1
NRF_RADIO->SWITCHPATTERN = 0x1; // slots 1, 3, 5... - antenna 2

So I currently modified the following 

radio_df.c

void radio_df_ant_switch_pattern_set(uint8_t *patterns, uint8_t len)
{
	for (uint8_t idx = 0; idx < len; ++idx) {
		NRF_RADIO->PSEL.DFEGPIO[0] = 0x0000001A; //(P0.26)
		NRF_RADIO->SWITCHPATTERN = 0x0; // before CTE - antenna 1
		NRF_RADIO->SWITCHPATTERN = 0x0; // reference - antenna 1
		NRF_RADIO->SWITCHPATTERN = 0x0; // slots 0, 2, 4... - antenna 1
		NRF_RADIO->SWITCHPATTERN = 0x1; // slots 1, 3, 5... - antenna 2
	}
}

nrf52833dk_nrf52833.overlay

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

&radio {
	status = "okay";
	/* This is a number of antennas that are available on antenna matrix
	 * designed by Nordic. For more information see README.rst.
	 */
	dfe-antenna-num = < 2 >;
        /*dfe-antenna-num = <12>;*/
	/* This is a setting that enables antenna 12 (in antenna matrix designed
	 * by Nordic) for Rx PDU. For more information see README.rst.
	 */
	dfe-pdu-antenna = <0x0>;
        /*dfe-pdu-antenna = <0x2>;*/
	/* These are GPIO pin numbers that are provided to
	 * Radio peripheral. The pins will be acquired by Radio to
	 * drive antenna switching when AoA is enabled.
	 * Pin numbers are selected to drive switches on antenna matrix
	 * desinged by Nordic. For more information see README.rst.
	 */
	dfegpio0-gpios = <&gpio0 3 0>;
	dfegpio1-gpios = <&gpio0 4 0>;
    dfegpio2-gpios = <&gpio0 26 0>;
    dfegpio3-gpios = <&gpio0 27 0>;

};

Query case

main.c

RF1 0 | 1 = 0x1 

RF2 0 | 0 = 0x0

static const uint8_t ant_patterns[] = { 0x1, 0x0, 0x1 };

What am I missing?

Thank!