Add tiny_relay variant files

- platformio.ini: Build configuration for tiny relay variant
- target.cpp/h: Hardware-specific implementation
- variant.h: Variant identification header

variants/tiny_relay/platformio.ini

@@ -0,0 +1,44 @@
+[Tiny_Relay]
+extends = stm32_base
+board = tiny_relay
+board_upload.maximum_size = 229376 ; 32kb for FS
+build_flags = ${stm32_base.build_flags}
+  -D RADIO_CLASS=CustomSTM32WLx
+  -D WRAPPER_CLASS=CustomSTM32WLxWrapper
+  -D SPI_INTERFACES_COUNT=0
+  -D RX_BOOSTED_GAIN=true
+;  -D STM32WL_TCXO_VOLTAGE=1.6 ; defaults to 0 if undef
+;  -D LORA_TX_POWER=14 ; Defaults to 22 for HP, 14 is for LP version
+  -D LORA_TX_POWER=22 ; Enable 22dBm transmission
+  -D MAX_LORA_TX_POWER=22 ; Allow setting up to 22dBm in companion radio
+  -I variants/tiny_relay
+build_src_filter = ${stm32_base.build_src_filter}
+  +<../variants/tiny_relay>
+
+[env:Tiny_Relay-repeater]
+extends = Tiny_Relay
+build_flags = ${Tiny_Relay.build_flags}
+  -D ADVERT_NAME='"tiny_relay Repeater"'
+  -D ADMIN_PASSWORD='"password"'
+build_src_filter = ${Tiny_Relay.build_src_filter}
+  +<../examples/simple_repeater/main.cpp>
+
+[env:Tiny_Relay-sensor]
+extends = Tiny_Relay
+build_flags = ${Tiny_Relay.build_flags}
+  -D ADVERT_NAME='"tiny_relay Sensor"'
+  -D ADMIN_PASSWORD='"password"'
+build_src_filter = ${Tiny_Relay.build_src_filter}
+  +<../examples/simple_sensor>
+
+[env:Tiny_Relay_companion_radio_usb]
+extends = Tiny_Relay
+build_flags = ${Tiny_Relay.build_flags}
+;  -D FORMAT_FS=true
+  -D MAX_CONTACTS=100
+  -D MAX_GROUP_CHANNELS=8
+  -D MAX_LORA_TX_POWER=22
+build_src_filter = ${Tiny_Relay.build_src_filter}
+  +<../examples/companion_radio/*.cpp>
+lib_deps = ${Tiny_Relay.lib_deps}
+  densaugeo/base64 @ ~1.4.0

variants/tiny_relay/target.cpp

@@ -0,0 +1,82 @@
+#include "target.h"
+#include <Arduino.h>
+#include <helpers/ArduinoHelpers.h>
+
+TinyRelayBoard board;
+
+RADIO_CLASS radio = new STM32WLx_Module();
+
+WRAPPER_CLASS radio_driver(radio, board);
+
+static const uint32_t rfswitch_pins[] = {LORAWAN_RFSWITCH_PINS, 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,
+};
+
+VolatileRTCClock rtc_clock;
+SensorManager sensors;
+
+#ifndef LORA_CR
+#define LORA_CR 5
+#endif
+
+#ifndef STM32WL_TCXO_VOLTAGE
+// TCXO set to 0 for RAK3172
+#define STM32WL_TCXO_VOLTAGE 0
+#endif
+
+#ifndef LORA_TX_POWER
+#define LORA_TX_POWER 22
+#endif
+
+bool radio_init()
+{
+    //  rtc_clock.begin(Wire);
+
+    radio.setRfSwitchTable(rfswitch_pins, rfswitch_table);
+
+    int status = radio.begin(LORA_FREQ, LORA_BW, LORA_SF, LORA_CR, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 16,
+                             STM32WL_TCXO_VOLTAGE, 0);
+
+    if (status != RADIOLIB_ERR_NONE) {
+        Serial.print("ERROR: radio init failed: ");
+        Serial.println(status);
+        return false; // fail
+    }
+
+#ifdef RX_BOOSTED_GAIN
+    radio.setRxBoostedGainMode(RX_BOOSTED_GAIN);
+#endif
+
+    radio.setCRC(1);
+
+    return true; // success
+}
+
+uint32_t radio_get_rng_seed()
+{
+    return radio.random(0x7FFFFFFF);
+}
+
+void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr)
+{
+    radio.setFrequency(freq);
+    radio.setSpreadingFactor(sf);
+    radio.setBandwidth(bw);
+    radio.setCodingRate(cr);
+}
+
+void radio_set_tx_power(uint8_t dbm)
+{
+    radio.setOutputPower(dbm);
+}
+
+mesh::LocalIdentity radio_new_identity()
+{
+    RadioNoiseListener rng(radio);
+    return mesh::LocalIdentity(&rng); // create new random identity
+}

variants/tiny_relay/target.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#define RADIOLIB_STATIC_ONLY 1
+#include <RadioLib.h>
+#include <helpers/ArduinoHelpers.h>
+#include <helpers/SensorManager.h>
+#include <helpers/radiolib/CustomSTM32WLxWrapper.h>
+#include <helpers/radiolib/RadioLibWrappers.h>
+#include <helpers/stm32/STM32Board.h>
+
+#define PIN_VBAT_READ A0
+#define ADC_MULTIPLIER (5 * 1.73 * 1000)
+
+class TinyRelayBoard : public STM32Board
+{
+  public:
+    void begin() override
+    {
+        STM32Board::begin();
+        pinMode(PA0, OUTPUT);
+        pinMode(PA1, OUTPUT);
+    }
+
+    const char *getManufacturerName() const override { return "Tiny Relay"; }
+
+    uint16_t getBattMilliVolts() override
+    {
+        analogReadResolution(12);
+        uint32_t raw = 0;
+        for (int i = 0; i < 8; i++) {
+            raw += analogRead(PIN_VBAT_READ);
+        }
+        return ((double)raw) * ADC_MULTIPLIER / 8 / 4096;
+    }
+
+    void setGpio(uint32_t values) override
+    {
+        // set led values
+        digitalWrite(PA0, values & 1);
+        digitalWrite(PA1, (values & 2) >> 1);
+    }
+
+    uint32_t getGpio() override
+    {
+        // get led value
+        return (digitalRead(PA1) << 1) | digitalRead(PA0);
+    }
+};
+
+extern TinyRelayBoard board;
+extern WRAPPER_CLASS radio_driver;
+extern VolatileRTCClock rtc_clock;
+extern SensorManager sensors;
+
+bool radio_init();
+uint32_t radio_get_rng_seed();
+void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr);
+void radio_set_tx_power(uint8_t dbm);
+mesh::LocalIdentity radio_new_identity();

variants/tiny_relay/variant.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <variant_RAK3172_MODULE.h>
+
+#undef RNG