Help to test STM32WLx examples with RAK3172 Module.

[mmcArg]

Hi!!!!! first of all sorry for my english.
I want to test the STM32WLx examples of RadioLib with some RAK3172 Modules.
I have dubts about configuration of RF SWITCH:

in examples:

static const uint32_t rfswitch_pins[] =
{PC3, PC4, PC5};
static const Module::RfSwitchMode_t rfswitch_table[] = {
{STM32WLx::MODE_IDLE, {LOW, LOW, LOW}},
{STM32WLx::MODE_RX, {HIGH, HIGH, LOW}},
{STM32WLx::MODE_TX_LP, {HIGH, HIGH, HIGH}},
{STM32WLx::MODE_TX_HP, {HIGH, LOW, HIGH}},
END_OF_MODE_TABLE,
};

Looking in RAK FORUM (https://forum.rakwireless.com/t/rak3172-internal-schematic/4557) about internal module schematic;

PC13: RF SWITCH CTRL2
PB8: RF SWITCH CTRL1

someone did test RAK3172 with RadioLib? How I must configure rfswitch pins and mode table for that?
Regards!!!!!

[jgromes]

The RF switch configuration shown in the example is just that - an example. The configuration will be different for different boards, exactly as the note above it says.

You will need to figure whether the modules uses the high power (HP), low power (LP) or both amplifiers, and what configuration of PC13/PB8 switches controls whic mode (RX, TX etc.). Feel free to search the discussion and issues here, I think RAK modules were mentioned by couple people at some point.

[mikechristiansen]

@mmcArg did you get the rak3172 working with radiolib? I have super low power output and think it is my RF switch config.

static const uint32_t rfswitch_pins[5] = {PB8, PC13, RADIOLIB_NC, RADIOLIB_NC, RADIOLIB_NC};
static const Module::RfSwitchMode_t rfswitch_table[] = {
{STM32WLx::MODE_IDLE, {LOW, LOW}},
{STM32WLx::MODE_RX, {HIGH, LOW}},
{STM32WLx::MODE_TX_LP, {LOW, HIGH}},
{STM32WLx::MODE_TX_HP, {LOW, HIGH}},
END_OF_MODE_TABLE
};
Does this configuration look correct? I’ve compared the LOW/HIGH logic to the STM32Cube examples and tried to match them accordingly.

Cheers, Mike.

[HeadBoffin]

I have super low power output and think it is my RF switch config.

Does this mean it's working? OR does it mean it's doing what you expect? What is 'super low power output' in numbers?

[StevenCellist]

RAK3172 uses SX1262 which doesn't support MODE_TX_LP, so you must remove that entry from the table.

[mikechristiansen]

Thanks for the replys,
Super low output from what was expected.
I have configured the radio for 22 output and get a -100db strength on a receiver 5 meters away, and if I go any further I get nothing.
I have removed the LP entry with the same behaviour.
Also if I confugre the switch with some random unused pins I get the same output making me think the switch is the problem.
RAK have confirmed I am using the correct pins. https://forum.rakwireless.com/t/developing-for-the-rak3172-chipset-in-platformio-using-arduino/14474/5
My code is here if anyone would like to take a look. https://github.com/mikechristiansen/WS-RAK3172l-fanet/blob/main/src/main.cpp

Appreciate any input. Thanks!

[radiohound]

Hi Mike, I am using a different module, but it also uses a STM32WLE5 ic. I’m not sure if this pertains to your issue, but I did notice that I was not transmitting at full power, unless I added this over current protection code after setOutputPower: ``` // set over current protection limit to 140 mA (accepted range is 45 - 240 mA) if (radio.setCurrentLimit(140) == RADIOLIB_ERR_INVALID_CURRENT_LIMIT) { Serial.println(F("Selected current limit is invalid for this module!")); while (true); } ``` The complete code here: https://github.com/radiohound/PicoTrack

…

On Mon, Mar 31, 2025 at 10:53 AM mikechristiansen ***@***.***> wrote: Thanks for the replys, Super low output from what was expected. I have configured the radio for 22 output and get a -100db strength on a receiver 5 meters away, and if I go any further I get nothing. I have removed the LP entry with the same behaviour. Also if I confugre the switch with some random unused pins I get the same output making me think the switch is the problem. RAK have confirmed I am using the correct pins. https://forum.rakwireless.com/t/developing-for-the-rak3172-chipset-in-platformio-using-arduino/14474/5 My code is here if anyone would like to take a look. https://github.com/mikechristiansen/WS-RAK3172l-fanet/blob/main/src/main.cpp Appreciate any input. Thanks! — Reply to this email directly, view it on GitHub <#863 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAOA5OJTSBBRSQ34GY7JCKT2XGFL5AVCNFSM6AAAAAB2BFXC32VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTENRXHE3TSNQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>