RAK3172 Internal Schematic

Charles · July 21, 2021, 5:26pm

you can check this breakout board I made here

Then associated definition I made for mbed-os but shows pinout

and the radio driver done accordingly here to control the pin

ARMmbed/stm32customtargets/blob/master/TARGET_STM32WL/TARGET_RAK3172/RAK3172_radio_driver.cpp

/* mbed Microcontroller Library
 * SPDX-License-Identifier: BSD-3-Clause
 ******************************************************************************
 *
 * Copyright (c) 2021 STMicroelectronics.
 * All rights reserved.
 *
 * This software component is licensed by ST under BSD 3-Clause license,
 * the "License"; You may not use this file except in compliance with the
 * License. You may obtain a copy of the License at:
 *                        opensource.org/licenses/BSD-3-Clause
 *
 ******************************************************************************
 */

#include "STM32WL_radio_driver.h"
#include "drivers/DigitalOut.h"


/* Sets up radio switch position according to the radio mode */

This file has been truncated. show original

    // Radio specific controls (TX/RX duplexer switch control)
    mbed::DigitalOut _rf_switch_ctrl1(PB_8);
    mbed::DigitalOut _rf_switch_ctrl2(PC_13);

Confirmed to work I had some trouble to connect at the beginning because at 1st start I left TXCO feature enabled.