Raspberry Pi Pico target (with sparkfun lora hat) does compile but needs further work.

Also contains a small fix to make PRIVATE_HW targets build again for nRF52 architectures

platformio.ini

@@ -92,7 +92,7 @@ lib_deps =
 extends = arduino_base
 platform = espressif32@3.5.0
 build_src_filter = 
-  ${arduino_base.build_src_filter} -<nrf52/> -<stm32wl>
+  ${arduino_base.build_src_filter} -<nrf52/> -<stm32wl> -<rp2040>
 upload_speed = 115200
 debug_init_break = tbreak setup
 
@@ -144,7 +144,7 @@ build_flags =
   ${arduino_base.build_flags} -Wno-unused-variable 
   -Isrc/nrf52
 build_src_filter = 
-  ${arduino_base.build_src_filter} -<esp32/> -<stm32wl> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/>
+  ${arduino_base.build_src_filter} -<esp32/> -<stm32wl> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/> -<rp2040>
 lib_ignore =
   BluetoothOTA
 
@@ -165,3 +165,23 @@ board = nrf52840_dk
 [env:feather_nrf52832]
 extends = nrf52_base
 board = adafruit_feather_nrf52832
+
+; Common settings for rp2040 Processor based targets
+[rp2040_base]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+extends = arduino_base
+board_build.core = earlephilhower
+board_build.filesystem_size = 0.5m
+build_flags = 
+  ${arduino_base.build_flags} -Wno-unused-variable 
+  -Isrc/rp2040
+  -D__PLAT_RP2040__
+#  -D _POSIX_THREADS
+build_src_filter = 
+  ${arduino_base.build_src_filter} -<esp32/> -<nimble/> -<mesh/wifi/> -<mesh/http/> -<modules/esp32> -<mqtt/> -<nrf52/> -<stm32wl> -<../.pio/libdeps/pico/tiny-AES-c/test.*>
+lib_ignore =
+  BluetoothOTA
+lib_deps =
+  ${arduino_base.lib_deps}
+  ${environmental_base.lib_deps}
+  https://github.com/kokke/tiny-AES-c.git

src/FSCommon.cpp

@@ -44,7 +44,7 @@ bool renameFile(const char* pathFrom, const char* pathTo)
 void listDir(const char * dirname, uint8_t levels)
 {
 #ifdef FSCom
-    File root = FSCom.open(dirname);
+    File root = FSCom.open(dirname, FILE_O_READ);
     if(!root){
         return;
     }
@@ -71,7 +71,7 @@ void listDir(const char * dirname, uint8_t levels)
 void rmDir(const char * dirname)
 {
 #ifdef FSCom
-    File file = FSCom.open(dirname);
+    File file = FSCom.open(dirname, FILE_O_READ);
     if(!file){
         return;
     }

src/FSCommon.h

@@ -13,6 +13,15 @@
 #define FILE_O_READ "r"
 #endif
 
+#if defined(ARCH_RP2040)
+// RP2040
+#include "LittleFS.h"
+#define FSCom LittleFS
+#define FSBegin() FSCom.begin()
+#define FILE_O_WRITE "w"
+#define FILE_O_READ "r"
+#endif
+
 #if defined(ARCH_ESP32)
 // ESP32 version
 #include "LITTLEFS.h"

src/mesh/NodeDB.cpp

@@ -297,7 +297,7 @@ bool loadProto(const char *filename, size_t protoSize, size_t objSize, const pb_
 #ifdef FSCom
     // static DeviceState scratch; We no longer read into a tempbuf because this structure is 15KB of valuable RAM
 
-    auto f = FSCom.open(filename);
+    auto f = FSCom.open(filename, FILE_O_READ);
 
     if (f) {
         DEBUG_MSG("Loading %s\n", filename);

src/nrf52/architecture.h

@@ -40,6 +40,8 @@
     #define HW_VENDOR HardwareModel_T_ECHO
 #elif defined(NORDIC_PCA10059)
     #define HW_VENDOR HardwareModel_NRF52840_PCA10059
+#elif defined(PRIVATE_HW)
+    #define HW_VENDOR HardwareModel_PRIVATE_HW
 #else
     #define HW_VENDOR HardwareModel_NRF52_UNKNOWN
 #endif

src/rp2040/architecture.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#define ARCH_RP2040
+
+#if defined(PRIVATE_HW)
+    #define HW_VENDOR HardwareModel_PRIVATE_HW
+#endif

src/rp2040/main-rp2040.cpp

@@ -0,0 +1,30 @@
+#include "configuration.h"
+#include <stdio.h>
+#include <pico/unique_id.h>
+
+void setBluetoothEnable(bool on)
+{
+    // not needed
+}
+
+void cpuDeepSleep(uint64_t msecs)
+{
+    // not needed
+}
+
+void updateBatteryLevel(uint8_t level)
+{
+    // not needed
+}
+
+void getMacAddr(uint8_t *dmac)
+{
+    pico_unique_board_id_t src;
+    pico_get_unique_board_id(&src);
+    dmac[5] = src.id[0];
+    dmac[4] = src.id[1];
+    dmac[3] = src.id[2];
+    dmac[2] = src.id[3];
+    dmac[1] = src.id[4];
+    dmac[0] = src.id[5];
+}

src/rp2040/rp2040CryptoEngine.cpp

@@ -0,0 +1,36 @@
+#include "configuration.h"
+#include "CryptoEngine.h"
+#include "aes.hpp"
+
+class RP2040CryptoEngine : public CryptoEngine
+{
+  public:
+    RP2040CryptoEngine() {}
+
+    ~RP2040CryptoEngine() {}
+
+    /**
+     * Encrypt a packet
+     *
+     * @param bytes is updated in place
+     */
+    virtual void encrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes) override
+    {
+        if (key.length > 0) {
+            AES_ctx ctx;
+            initNonce(fromNode, packetNum);
+            AES_init_ctx_iv(&ctx, key.bytes, nonce);
+            AES_CTR_xcrypt_buffer(&ctx, bytes, numBytes);
+        }
+    }
+
+    virtual void decrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes) override
+    {
+        // For CTR, the implementation is the same
+        encrypt(fromNode, packetNum, numBytes, bytes);
+    }
+
+  private:
+};
+
+CryptoEngine *crypto = new RP2040CryptoEngine();

variants/pico/platformio.ini

@@ -0,0 +1,17 @@
+[env:pico]
+extends = rp2040_base
+board = pico
+upload_protocol = picotool
+
+# add our variants files to the include and src paths
+build_flags = ${rp2040_base.build_flags} 
+  -DPRIVATE_HW
+  -Ivariants/pico
+  -DARDUINO_AVR_NANO_EVERY
+  -DDEBUG_RP2040_WIRE
+  -DDEBUG_RP2040_SPI
+  -DDEBUG_RP2040_CORE
+  -DDEBUG_RP2040_PORT=Serial
+  -DUSE_TINYUSB
+lib_deps =
+  ${rp2040_base.lib_deps}

variants/pico/variant.h

@@ -0,0 +1,52 @@
+// #define RADIOLIB_CUSTOM_ARDUINO 1
+// #define RADIOLIB_TONE_UNSUPPORTED 1
+// #define RADIOLIB_SOFTWARE_SERIAL_UNSUPPORTED 1
+
+#define ARDUINO_ARCH_AVR
+
+#define CBC 0
+#define CTR 1
+#define ECB 0
+
+#define NO_GPS 1
+#define USE_SH1106 1
+#undef GPS_SERIAL_NUM
+
+// #define I2C_SDA 6
+// #define I2C_SCL 7
+
+#define BUTTON_PIN 17
+#define EXT_NOTIFY_OUT 4
+
+#define BATTERY_PIN 26
+// ratio of voltage divider = 3.0 (R17=200k, R18=100k)
+#define ADC_MULTIPLIER 3.1 // 3.0 + a bit for being optimistic
+
+#define USE_RF95
+#define USE_SX1262
+
+#undef RF95_SCK
+#undef RF95_MISO
+#undef RF95_MOSI
+#undef RF95_NSS
+
+#define RF95_SCK 10
+#define RF95_MISO 12
+#define RF95_MOSI 11
+#define RF95_NSS 3
+
+#define LORA_DIO0 RADIOLIB_NC
+#define LORA_RESET 15
+#define LORA_DIO1 20
+#define LORA_DIO2 2
+#define LORA_DIO3 RADIOLIB_NC
+
+#ifdef USE_SX1262
+#define SX126X_CS RF95_NSS
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+#define SX126X_E22
+#endif
+
+#include <Adafruit_TinyUSB.h>

variants/t-echo/platformio.ini

@@ -3,7 +3,7 @@
 extends = nrf52840_base
 board = t-echo
 debug_tool = jlink
-upload_protocol = jlink
+upload_protocol = nrfutil
 # add our variants files to the include and src paths
 # define build flags for the TFT_eSPI library - NOTE: WE NOT LONGER USE TFT_eSPI, it was for an earlier version of the TTGO eink screens
 # -DBUSY_PIN=3 -DRST_PIN=2 -DDC_PIN=28 -DCS_PIN=30