From f31fd34ce049d4720a2adc69101fb9fe2e8d1b62 Mon Sep 17 00:00:00 2001
From: Sam Duffield <136561674+samuel-duffield1@users.noreply.github.com>
Date: Thu, 4 Sep 2025 12:49:47 +0100
Subject: [PATCH] Add support for the Challenger rp2040 lora (#7826)

* Firmware Built... awaiting parts for test

* Add board_level key/value as per suggestion from vidplace7

* Trunk formatting applied
---
 .../challenger_2040_lora/pins_arduino.h       | 79 +++++++++++++++++++
 .../challenger_2040_lora/platformio.ini       | 16 ++++
 .../rp2040/challenger_2040_lora/variant.h     | 39 +++++++++
 3 files changed, 134 insertions(+)
 create mode 100644 variants/rp2040/challenger_2040_lora/pins_arduino.h
 create mode 100644 variants/rp2040/challenger_2040_lora/platformio.ini
 create mode 100644 variants/rp2040/challenger_2040_lora/variant.h

diff --git a/variants/rp2040/challenger_2040_lora/pins_arduino.h b/variants/rp2040/challenger_2040_lora/pins_arduino.h
new file mode 100644
index 000000000..ac472c07e
--- /dev/null
+++ b/variants/rp2040/challenger_2040_lora/pins_arduino.h
@@ -0,0 +1,79 @@
+#pragma once
+
+#define PINS_COUNT (25u)
+#define NUM_DIGITAL_PINS (25u)
+#define NUM_ANALOG_INPUTS (4u)
+#define NUM_ANALOG_OUTPUTS (0u)
+#define ADC_RESOLUTION (12u)
+
+// LEDs
+#define PIN_LED (24u)
+
+// Serial
+#define PIN_SERIAL1_TX (16u)
+#define PIN_SERIAL1_RX (17u)
+
+// SPI
+#define PIN_SPI0_MISO (20u)
+#define PIN_SPI0_MOSI (23u)
+#define PIN_SPI0_SCK (22u)
+#define PIN_SPI0_SS (21u)
+
+// Connected to LoRa module
+#define PIN_SPI1_MISO (12u)
+#define PIN_SPI1_MOSI (11u)
+#define PIN_SPI1_SCK (10u)
+#define PIN_SPI1_SS (9u)
+#define RFM95W_SS (9u)
+#define RFM95W_DIO0 (14u)
+#define RFM95W_DIO1 (15u)
+#define RFM95W_DIO2 (18u)
+#define RFM95W_RST (13u)
+#define RFM95W_SPI SPI1
+
+// Wire
+#define PIN_WIRE0_SDA (0u)
+#define PIN_WIRE0_SCL (1u)
+
+// Not pinned out
+#define PIN_WIRE1_SDA (31u)
+#define PIN_WIRE1_SCL (31u)
+#define PIN_SERIAL2_RX (31u)
+#define PIN_SERIAL2_TX (31u)
+
+#define SERIAL_HOWMANY (1u)
+#define SPI_HOWMANY (2u)
+#define WIRE_HOWMANY (1u)
+
+#define LED_BUILTIN PIN_LED
+
+static const uint8_t D0 = (16u);
+static const uint8_t D1 = (17u);
+static const uint8_t D2 = (20u);
+static const uint8_t D3 = (23u);
+static const uint8_t D4 = (22u);
+static const uint8_t D5 = (2u);
+static const uint8_t D6 = (3u);
+static const uint8_t D7 = (0u);
+static const uint8_t D8 = (1u);
+static const uint8_t D9 = (4u);
+static const uint8_t D10 = (5u);
+static const uint8_t D11 = (6u);
+static const uint8_t D12 = (7u);
+static const uint8_t D13 = (8u);
+static const uint8_t D14 = (13u);
+static const uint8_t D15 = (14u);
+static const uint8_t D16 = (15u);
+static const uint8_t D17 = (18u);
+static const uint8_t D18 = (24u);
+
+static const uint8_t A0 = (26u);
+static const uint8_t A1 = (27u);
+static const uint8_t A2 = (28u);
+static const uint8_t A3 = (29u);
+static const uint8_t A4 = (19u);
+static const uint8_t A5 = (21u);
+
+#ifndef SS
+#define SS PIN_SPI1_SS
+#endif
\ No newline at end of file
diff --git a/variants/rp2040/challenger_2040_lora/platformio.ini b/variants/rp2040/challenger_2040_lora/platformio.ini
new file mode 100644
index 000000000..4a709d650
--- /dev/null
+++ b/variants/rp2040/challenger_2040_lora/platformio.ini
@@ -0,0 +1,16 @@
+[env:challenger_2040_lora]
+extends = rp2040_base
+board = challenger_2040_lora
+board_level = extra
+upload_protocol = picotool
+# add our variants files to the include and src paths
+build_flags = 
+  ${rp2040_base.build_flags} 
+  -D PRIVATE_HW
+  -I variants/rp2040/challenger_2040_lora
+  -D DEBUG_RP2040_PORT=Serial
+  -D HW_SPI1_DEVICE
+lib_deps =
+  ${rp2040_base.lib_deps}
+debug_build_flags = ${rp2040_base.build_flags}
+debug_tool = cmsis-dap ; for e.g. Picotool
diff --git a/variants/rp2040/challenger_2040_lora/variant.h b/variants/rp2040/challenger_2040_lora/variant.h
new file mode 100644
index 000000000..552f90720
--- /dev/null
+++ b/variants/rp2040/challenger_2040_lora/variant.h
@@ -0,0 +1,39 @@
+// Define SS for compatibility with libraries expecting a default SPI chip select pin
+
+#define ARDUINO_ARCH_AVR
+
+#define EXT_NOTIFY_OUT 0xFFFFFFFF
+#define BUTTON_PIN 0xFFFFFFFF
+
+#define LED_PIN PIN_LED
+
+#define USE_RF95 // RFM95/SX127x
+
+#undef LORA_SCK
+#undef LORA_MISO
+#undef LORA_MOSI
+#undef LORA_CS
+
+// https://gitlab.com/invectorlabs/hw/challenger_rp2040_lora
+#define LORA_SCK 10  // Clock
+#define LORA_CS 9    // Chip Select
+#define LORA_MOSI 11 // Serial Data Out
+#define LORA_MISO 12 // Serial Data In
+
+#define LORA_RESET 13 // Reset
+
+#define LORA_DIO0 14         // DIO0
+#define LORA_DIO1 15         // DIO1
+#define LORA_DIO2 18         // DIO2
+#define LORA_DIO3 0xFFFFFFFF // Not connected
+#define LORA_DIO4 0xFFFFFFFF // Not connected
+#define LORA_DIO5 0xFFFFFFFF // Not connected
+
+#ifdef USE_SX1262
+#define SX126X_CS LORA_CS
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+#define SX126X_DIO2_AS_RF_SWITCH
+// #define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#endif
\ No newline at end of file