Add GPIO_DETECT_PA portduino config, and support 13302 detection with it (#9741)

* Add GPIO_DETECT_PA portduino config, and support 13302 detection with it.

* Tweak PA detect gpio to use pinMapping

* minor yaml output fixes

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

Author: jp-bennett

bin/config.d/lora-hat-rak-6421-pi-hat.yaml

@@ -9,3 +9,5 @@ Lora:
   DIO3_TCXO_VOLTAGE: true
   DIO2_AS_RF_SWITCH: true
   spidev: spidev0.0
+  GPIO_DETECT_PA: 13
+  TX_GAIN_LORA: [8, 8, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 8, 8, 7]

bin/config.d/lora-usb-umesh-1262-30dbm.yaml

@@ -13,8 +13,7 @@ Lora:
 #  USB_Serialnum: 12345678
   SX126X_MAX_POWER: 22
 # Reduce output power to improve EMI
-  NUM_PA_POINTS: 22
-  TX_GAIN_LORA: 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 8, 8, 7
+  TX_GAIN_LORA: [12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 8, 8, 7]
 # Note: This module integrates an additional PA to achieve higher output power.
 # The 'power' parameter here does not represent the actual RF output.
 # TX_GAIN_LORA defines the gain offset applied at each SX1262 input power step (1–22 dBm).

bin/config.d/lora-usb-umesh-1268-30dbm.yaml

@@ -13,8 +13,7 @@ Lora:
 #  USB_Serialnum: 12345678
   SX126X_MAX_POWER: 22
 # Reduce output power to improve EMI
-  NUM_PA_POINTS: 22
-  TX_GAIN_LORA: 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 8, 8, 7
+  TX_GAIN_LORA: [12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 8, 8, 7]
 # Note: This module integrates an additional PA to achieve higher output power.
 # The 'power' parameter here does not represent the actual RF output.
 # TX_GAIN_LORA defines the gain offset applied at each SX1262 input power step (1–22 dBm).

src/platform/portduino/PortduinoGlue.cpp

@@ -537,6 +537,27 @@ void portduinoSetup()
         }
     }
 
+    // In one test, this dance seemed necessary to trigger the pin to detect properly.
+    if (portduino_config.lora_pa_detect_pin.enabled) {
+        pinMode(portduino_config.lora_pa_detect_pin.pin, INPUT_PULLDOWN);
+        sleep(1);
+        if (digitalRead(portduino_config.lora_pa_detect_pin.pin) == LOW) {
+            std::cout << "Pin " << portduino_config.lora_pa_detect_pin.pin << " PULLDOWN is LOW" << std::endl;
+        }
+        pinMode(portduino_config.lora_pa_detect_pin.pin, INPUT_PULLUP);
+        sleep(1);
+        if (digitalRead(portduino_config.lora_pa_detect_pin.pin) == HIGH) {
+            std::cout << "Pin " << portduino_config.lora_pa_detect_pin.pin << " PULLUP is HIGH, dropping PA curve" << std::endl;
+            portduino_config.num_pa_points = 1;
+            portduino_config.tx_gain_lora[0] = 0;
+        } else {
+            std::cout << "Pin " << portduino_config.lora_pa_detect_pin.pin << " PULLUP is LOW, using PA curve" << std::endl;
+        }
+
+        // disable bias once finished
+        pinMode(portduino_config.lora_pa_detect_pin.pin, INPUT);
+    }
+
     // Only initialize the radio pins when dealing with real, kernel controlled SPI hardware
     if (portduino_config.lora_spi_dev != "" && portduino_config.lora_spi_dev != "ch341") {
         SPI.begin(portduino_config.lora_spi_dev.c_str());

src/platform/portduino/PortduinoGlue.h

@@ -107,6 +107,7 @@ extern struct portduino_config_struct {
     pinMapping lora_txen_pin = {"Lora", "TXen"};
     pinMapping lora_rxen_pin = {"Lora", "RXen"};
     pinMapping lora_sx126x_ant_sw_pin = {"Lora", "SX126X_ANT_SW"};
+    pinMapping lora_pa_detect_pin = {"Lora", "GPIO_DETECT_PA"};
     std::vector<pinMapping> extra_pins = {};
 
     // GPS
@@ -194,13 +195,14 @@ extern struct portduino_config_struct {
     int maxtophone = 100;
     int MaxNodes = 200;
 
-    pinMapping *all_pins[20] = {&lora_cs_pin,
+    pinMapping *all_pins[21] = {&lora_cs_pin,
                                 &lora_irq_pin,
                                 &lora_busy_pin,
                                 &lora_reset_pin,
                                 &lora_txen_pin,
                                 &lora_rxen_pin,
                                 &lora_sx126x_ant_sw_pin,
+                                &lora_pa_detect_pin,
                                 &displayDC,
                                 &displayCS,
                                 &displayBacklight,
@@ -255,18 +257,23 @@ extern struct portduino_config_struct {
             out << YAML::Key << "TX_GAIN_LORA" << YAML::Value << tx_gain_lora[0];
         }
 
-        out << YAML::Key << "DIO2_AS_RF_SWITCH" << YAML::Value << dio2_as_rf_switch;
+        if (dio2_as_rf_switch)
+            out << YAML::Key << "DIO2_AS_RF_SWITCH" << YAML::Value << dio2_as_rf_switch;
         if (dio3_tcxo_voltage != 0)
             out << YAML::Key << "DIO3_TCXO_VOLTAGE" << YAML::Value << YAML::Precision(3) << (float)dio3_tcxo_voltage / 1000;
         if (lora_usb_pid != 0x5512)
             out << YAML::Key << "USB_PID" << YAML::Value << YAML::Hex << lora_usb_pid;
         if (lora_usb_vid != 0x1A86)
             out << YAML::Key << "USB_VID" << YAML::Value << YAML::Hex << lora_usb_vid;
-        if (lora_spi_dev != "")
+        if (lora_spi_dev != "" && !(lora_spi_dev == "/dev/spidev0.0" && lora_module == use_autoconf)) {
+            if (lora_spi_dev.find("/dev/") != std::string::npos)
+                lora_spi_dev = lora_spi_dev.substr(5);
             out << YAML::Key << "spidev" << YAML::Value << lora_spi_dev;
+        }
         if (lora_usb_serial_num != "")
             out << YAML::Key << "USB_Serialnum" << YAML::Value << lora_usb_serial_num;
-        out << YAML::Key << "spiSpeed" << YAML::Value << spiSpeed;
+        if (spiSpeed != 2000000)
+            out << YAML::Key << "spiSpeed" << YAML::Value << spiSpeed;
         if (rfswitch_dio_pins[0] != RADIOLIB_NC) {
             out << YAML::Key << "rfswitch_table" << YAML::Value << YAML::BeginMap;