examples: NonArduino: Raspberry Pi Pico

examples/NonArduino/Pico/.gitignore

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+build/

examples/NonArduino/Pico/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.18)
+
+# Pull in SDK (must be before project)
+include(pico_sdk_import.cmake)
+
+project(pico-sx1276 C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+# Initialize the SDK
+pico_sdk_init()
+
+add_compile_options(
+    -Wall
+    -Wno-format          
+    -Wno-unused-function
+)
+
+add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../../../../RadioLib" "${CMAKE_CURRENT_BINARY_DIR}/RadioLib")
+
+add_executable(${PROJECT_NAME}
+    main.cpp
+)
+
+# Pull in common dependencies
+target_link_libraries(${PROJECT_NAME} pico_stdlib hardware_spi hardware_gpio hardware_timer RadioLib)
+
+
+pico_enable_stdio_usb(${PROJECT_NAME} 1)
+pico_enable_stdio_uart(${PROJECT_NAME} 0)
+
+# Create map/bin/hex file etc.
+pico_add_extra_outputs(${PROJECT_NAME})

examples/NonArduino/Pico/PicoHal.h

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+#ifndef PICO_HAL_H
+#define PICO_HAL_H
+
+// include RadioLib
+#include <RadioLib.h>
+
+// include the necessary Pico libraries
+#include <pico/stdlib.h>
+#include "hardware/spi.h"
+#include "hardware/timer.h"
+
+// create a new Raspberry Pi Pico hardware abstraction 
+// layer using the Pico SDK
+// the HAL must inherit from the base RadioLibHal class
+// and implement all of its virtual methods
+class PicoHal : public RadioLibHal {
+public:
+  PicoHal(spi_inst_t *spiChannel, uint32_t misoPin, uint32_t mosiPin, uint32_t sckPin, uint32_t spiSpeed = 500 * 1000)
+    : RadioLibHal(GPIO_IN, GPIO_OUT, 0, 1, GPIO_IRQ_EDGE_RISE, GPIO_IRQ_EDGE_FALL),
+    _spiChannel(spiChannel),
+    _spiSpeed(spiSpeed),
+    _misoPin(misoPin),
+    _mosiPin(mosiPin),
+    _sckPin(sckPin) {
+    }
+
+  void init() override {
+    stdio_init_all();
+    spiBegin();
+  }
+
+  void term() override {
+    spiEnd();
+  }
+
+  // GPIO-related methods (pinMode, digitalWrite etc.) should check
+  // RADIOLIB_NC as an alias for non-connected pins
+  void pinMode(uint32_t pin, uint32_t mode) override {
+    if (pin == RADIOLIB_NC) {
+      return;
+    }
+
+    gpio_set_dir(pin, mode);
+  }
+
+  void digitalWrite(uint32_t pin, uint32_t value) override {
+    if (pin == RADIOLIB_NC) {
+      return;
+    }
+
+    gpio_put(pin, (bool)value);
+  }
+
+  uint32_t digitalRead(uint32_t pin) override {
+    if (pin == RADIOLIB_NC) {
+      return 0;
+    }
+
+    return gpio_get(pin);
+  }
+
+  void attachInterrupt(uint32_t interruptNum, void (*interruptCb)(void), uint32_t mode) override {
+    if (interruptNum == RADIOLIB_NC) {
+      return;
+    }
+
+    gpio_set_irq_enabled_with_callback(interruptNum, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, true, (gpio_irq_callback_t)interruptCb);
+  }
+
+  void detachInterrupt(uint32_t interruptNum) override {
+    if (interruptNum == RADIOLIB_NC) {
+      return;
+    }
+
+    gpio_set_irq_enabled_with_callback(interruptNum, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, false, NULL);
+  }
+
+  void delay(unsigned long ms) override {
+    sleep_ms(ms);
+  }
+
+  void delayMicroseconds(unsigned long us) override {
+    sleep_us(us);
+  }
+
+  unsigned long millis() override {
+    return to_ms_since_boot(get_absolute_time());
+  }
+
+  unsigned long micros() override {
+    return to_us_since_boot(get_absolute_time());
+  }
+
+  long pulseIn(uint32_t pin, uint32_t state, unsigned long timeout) override {
+    if (pin == RADIOLIB_NC) {
+      return 0;
+    }
+
+    this->pinMode(pin, GPIO_IN);
+    uint32_t start = this->micros();
+    uint32_t curtick = this->micros();
+
+    while (this->digitalRead(pin) == state) {
+      if ((this->micros() - curtick) > timeout) {
+        return 0;
+      }
+    }
+
+    return (this->micros() - start);
+  }
+
+  void spiBegin() {
+    spi_init(_spiChannel, _spiSpeed);
+    spi_set_format(_spiChannel, 8, SPI_CPOL_0, SPI_CPHA_0, SPI_MSB_FIRST);
+
+    gpio_set_function(_sckPin, GPIO_FUNC_SPI);
+    gpio_set_function(_mosiPin, GPIO_FUNC_SPI);
+    gpio_set_function(_misoPin, GPIO_FUNC_SPI);
+  }
+
+  void spiBeginTransaction() {}
+
+  void spiTransfer(uint8_t *out, size_t len, uint8_t *in) {
+    spi_write_read_blocking(_spiChannel, out, in, len);
+  }
+
+  void spiEndTransaction() {}
+
+  void spiEnd() {
+    spi_deinit(_spiChannel);
+  }
+
+private:
+  // the HAL can contain any additional private members
+  spi_inst_t *_spiChannel;
+  uint32_t _spiSpeed;
+  uint32_t _misoPin;
+  uint32_t _mosiPin;
+  uint32_t _sckPin;
+};
+
+#endif

examples/NonArduino/Pico/main.cpp

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+/*
+  RadioLib Non-Arduino Raspberry Pi Pico library example
+
+  Licensed under the MIT License
+
+  Copyright (c) 2024 Cameron Goddard
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+*/
+
+// define pins to be used
+#define SPI_PORT spi0
+#define SPI_MISO 4
+#define SPI_MOSI 3
+#define SPI_SCK 2
+
+#define RFM_NSS 26
+#define RFM_RST 22
+#define RFM_DIO0 14
+#define RFM_DIO1 15
+
+#include <pico/stdlib.h>
+
+// include the library
+#include <RadioLib.h>
+
+// include the hardware abstraction layer
+#include "PicoHal.h"
+
+// create a new instance of the HAL class
+PicoHal* hal = new PicoHal(SPI_PORT, SPI_MISO, SPI_MOSI, SPI_SCK);
+
+// now we can create the radio module
+// NSS pin:  26
+// DIO0 pin:  14
+// RESET pin:  22
+// DIO1 pin:  15
+SX1276 radio = new Module(hal, RFM_NSS, RFM_DIO0, RFM_RST, RFM_DIO1);
+
+
+int main() {
+  stdio_init_all();
+
+  gpio_init(RFM_NSS);
+  gpio_init(RFM_RST);
+
+  gpio_set_dir(RFM_NSS, GPIO_OUT);
+  gpio_set_dir(RFM_RST, GPIO_OUT);
+
+  // reset the RF module
+
+  sleep_ms(10);
+  gpio_put(RFM_RST, 0);
+  sleep_ms(10);
+  gpio_put(RFM_RST, 1);
+
+  // initialize just like with Arduino
+  printf("[SX1276] Initializing ... ");
+  int state = radio.begin();
+  if (state != RADIOLIB_ERR_NONE) {
+    printf("failed, code %d\n", state);
+    return(1);
+  }
+  printf("success!\n");
+
+  // loop forever
+  for(;;) {
+    // send a packet
+    printf("[SX1276] Transmitting packet ... ");
+    state = radio.transmit("Hello World!");
+    if(state == RADIOLIB_ERR_NONE) {
+      // the packet was successfully transmitted
+      printf("success!\n");
+
+      // wait for a second before transmitting again
+      hal->delay(1000);
+
+    } else {
+      printf("failed, code %d\n", state);
+
+    }
+
+  }
+
+  return(0);
+}

examples/NonArduino/Pico/pico_sdk_import.cmake

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+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+            )
+        endif ()
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            FetchContent_Populate(pico_sdk)
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})