Add pico-sdk 'baremetal' support (#625)

* Add pico-sdk support
* Add ${CMAKE_CURRENT_LIST_DIR} to include boards.cmake/*.cmake properly
* Fix: Source file paths are not set correctly on esp-idf

CMakeLists.txt

@@ -1,38 +1,14 @@
-# CMakeLists for ESP-IDF
+set (LGFX_ROOT ${CMAKE_CURRENT_LIST_DIR})
 
-set(COMPONENT_ADD_INCLUDEDIRS
-    src
-    )
-file(GLOB SRCS
-     src/lgfx/Fonts/efont/*.c
-     src/lgfx/Fonts/IPA/*.c
-     src/lgfx/utility/*.c
-     src/lgfx/v1/*.cpp
-     src/lgfx/v1/misc/*.cpp
-     src/lgfx/v1/panel/*.cpp
-     src/lgfx/v1/platforms/arduino_default/*.cpp
-     src/lgfx/v1/platforms/esp32/*.cpp
-     src/lgfx/v1/platforms/esp32c3/*.cpp
-     src/lgfx/v1/platforms/esp32s2/*.cpp
-     src/lgfx/v1/platforms/esp32s3/*.cpp
-     src/lgfx/v1/touch/*.cpp
-     )
+# Espressif ESP* based boards
+if (DEFINED ESP_PLATFORM)
+include(${LGFX_ROOT}/boards.cmake/esp-idf.cmake)
 
-set(COMPONENT_SRCS ${SRCS})
+# Raspberry Pi RP* based boards
+elseif ((DEFINED PICO_PLATFORM) OR (DEFINED PICO_BOARD))
+include(${LGFX_ROOT}/boards.cmake/pico-sdk.cmake)
 
-if (IDF_VERSION_MAJOR GREATER_EQUAL 5)
-    set(COMPONENT_REQUIRES nvs_flash efuse esp_lcd driver esp_timer)
-elseif ((IDF_VERSION_MAJOR EQUAL 4) AND (IDF_VERSION_MINOR GREATER 3) OR IDF_VERSION_MAJOR GREATER 4)
-    set(COMPONENT_REQUIRES nvs_flash efuse esp_lcd)
+# Cannot determine boards type
 else()
-    set(COMPONENT_REQUIRES nvs_flash efuse)
+message("Error: No platform specified")
 endif()
-
-
-### If you use arduino-esp32 components, please activate next comment line.
-# list(APPEND COMPONENT_REQUIRES arduino-esp32)
-
-
-message(STATUS "LovyanGFX use components = ${COMPONENT_REQUIRES}")
-
-register_component()

boards.cmake/esp-idf.cmake

@@ -0,0 +1,38 @@
+# CMakeLists for ESP-IDF
+
+set(COMPONENT_ADD_INCLUDEDIRS
+    ${LGFX_ROOT}/src
+    )
+file(GLOB SRCS
+     ${LGFX_ROOT}/src/lgfx/Fonts/efont/*.c
+     ${LGFX_ROOT}/src/lgfx/Fonts/IPA/*.c
+     ${LGFX_ROOT}/src/lgfx/utility/*.c
+     ${LGFX_ROOT}/src/lgfx/v1/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/misc/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/panel/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/platforms/arduino_default/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/platforms/esp32/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/platforms/esp32c3/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/platforms/esp32s2/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/platforms/esp32s3/*.cpp
+     ${LGFX_ROOT}/src/lgfx/v1/touch/*.cpp
+     )
+
+set(COMPONENT_SRCS ${SRCS})
+
+if (IDF_VERSION_MAJOR GREATER_EQUAL 5)
+    set(COMPONENT_REQUIRES nvs_flash efuse esp_lcd driver esp_timer)
+elseif ((IDF_VERSION_MAJOR EQUAL 4) AND (IDF_VERSION_MINOR GREATER 3) OR IDF_VERSION_MAJOR GREATER 4)
+    set(COMPONENT_REQUIRES nvs_flash efuse esp_lcd)
+else()
+    set(COMPONENT_REQUIRES nvs_flash efuse)
+endif()
+
+
+### If you use arduino-esp32 components, please activate next comment line.
+# list(APPEND COMPONENT_REQUIRES arduino-esp32)
+
+
+message(STATUS "LovyanGFX use components = ${COMPONENT_REQUIRES}")
+
+register_component()

boards.cmake/pico-sdk.cmake

@@ -0,0 +1,50 @@
+# CMakeLists for PICO SDK
+
+include(${PICO_SDK_PATH}/external/pico_sdk_import.cmake)
+
+pico_sdk_init()
+
+add_compile_definitions(
+        USE_PICO_SDK=1
+        )
+
+# pico_add_library()
+add_library(LovyanGFX_headers INTERFACE)
+add_library(LovyanGFX INTERFACE)
+
+target_include_directories(
+    LovyanGFX_headers INTERFACE
+    src
+)
+
+#add_compile_definitions
+target_compile_definitions(LovyanGFX INTERFACE
+     USE_PICO_SDK
+    )
+
+file(GLOB SRCS
+     src/lgfx/Fonts/efont/*.c
+     src/lgfx/Fonts/IPA/*.c
+     src/lgfx/utility/*.c
+     src/lgfx/v1/*.cpp
+     src/lgfx/v1/misc/*.cpp
+     src/lgfx/v1/panel/*.cpp
+     src/lgfx/v1/platforms/arduino_default/*.cpp
+     src/lgfx/v1/platforms/rp2040/*.cpp
+     src/lgfx/v1/touch/*.cpp
+    )
+target_sources(LovyanGFX INTERFACE ${SRCS})
+target_link_libraries(LovyanGFX INTERFACE
+     LovyanGFX_headers
+     pico_stdlib
+     pico_float
+     pico_double
+     hardware_dma
+     hardware_gpio
+     hardware_spi
+     hardware_i2c
+     hardware_pwm
+    )
+
+pico_enable_stdio_usb(LovyanGFX 0)
+pico_enable_stdio_uart(LovyanGFX 1)

examples_for_picosdk/i2c/CMakeLists.txt

@@ -0,0 +1,61 @@
+#
+# Usage:
+#
+# 1. Copy this directory outside "LovyanGFX" directory
+#
+# 2. Set variables below (in environment variables or CMakeLists.txt)
+#    PICO_SDK_PATH
+#    PICO_PLATFORM (rp2040,rp2350-arm-s)
+#    PICO_BOARD (optional, "pico", "pico2",...)
+#
+# 3. Copy "LovyanGFX" directory to this directory)
+#
+# 4. mkdir and cd build directory
+#
+# 5. run cmake
+#
+
+set (PROJ_NAME i2c_test)
+
+cmake_minimum_required(VERSION 3.13)
+
+if (NOT (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/LovyanGFX))
+    message(FATAL_ERROR "Please copy \"LovyanGFX\" directory to \"${CMAKE_CURRENT_SOURCE_DIR}\".")
+endif()
+
+
+include(../pico_sdk_import.cmake)
+include(../pico_extras_import_optional.cmake)
+
+project(${PROJ_NAME}
+    C
+    CXX
+    ASM
+)
+
+set(CMAKE_C_STNDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+pico_sdk_init()
+
+add_subdirectory(
+    LovyanGFX
+)
+
+add_executable(${PROJ_NAME}
+  main.cpp
+)
+
+target_include_directories(${PROJ_NAME} PRIVATE
+    .
+)
+
+pico_enable_stdio_usb(${PROJ_NAME} 0)
+pico_enable_stdio_uart(${PROJ_NAME} 1)
+
+pico_add_extra_outputs(${PROJ_NAME})
+
+target_link_libraries(${PROJ_NAME}
+    pico_stdlib
+    LovyanGFX
+)

examples_for_picosdk/i2c/LGFX_config.hpp

@@ -0,0 +1,52 @@
+#include <LovyanGFX.hpp>
+
+// SSD1306 (128x64) の接続設定例
+#define TFT_SDA  12
+#define TFT_SCL  13
+#define I2C_PORT 0
+#define I2C_ADDR 0x3c
+
+class LGFX : public lgfx::LGFX_Device
+{
+  lgfx::Panel_SSD1306 _panel_instance;
+  lgfx::Bus_I2C       _bus_instance;   // I2Cバスのインスタンス
+public:
+  LGFX(void)
+  {
+    {                                    // バス制御の設定を行います。
+      auto cfg = _bus_instance.config(); // バス設定用の構造体を取得します。
+
+      // I2Cバスの設定
+      cfg.i2c_port    = I2C_PORT;   // 使用するI2Cポートを選択 (0 or 1)
+      cfg.freq_write  = 400000;     // 送信時のクロック
+      cfg.freq_read   = 400000;     // 受信時のクロック
+      cfg.pin_sda     = TFT_SDA;    // SDAを接続しているピン番号
+      cfg.pin_scl     = TFT_SCL;    // SCLを接続しているピン番号
+      cfg.i2c_addr    = I2C_ADDR;   // I2Cデバイスのアドレス
+
+      _bus_instance.config(cfg);              // 設定値をバスに反映します。
+      _panel_instance.setBus(&_bus_instance); // バスをパネルにセットします。
+    }
+
+    {                                      // 表示パネル制御の設定を行います。
+      auto cfg = _panel_instance.config(); // 表示パネル設定用の構造体を取得します。
+
+      cfg.pin_cs   = -1; // CSが接続されているピン番号   (-1 = disable)
+      cfg.pin_rst  = -1; // RSTが接続されているピン番号  (-1 = disable)
+      cfg.pin_busy = -1; // BUSYが接続されているピン番号 (-1 = disable)
+
+      cfg.panel_width  = 128; // 実際に表示可能な幅
+      cfg.panel_height = 64;  // 実際に表示可能な高さ
+      //cfg.offset_x     = 0;   // パネルのX方向オフセット量
+      //cfg.offset_y     = 0;   // パネルのY方向オフセット量
+
+      // cfg.offset_rotation = 4;    // 回転方向の値のオフセット 0~7 (4~7は上下反転)
+      // cfg.invert          = true; // パネルの明暗が反転してしまう場合 trueに設定
+      // cfg.rgb_order       = true; // パネルの赤と青が入れ替わってしまう場合 trueに設定
+
+      _panel_instance.config(cfg);
+    }
+
+    setPanel(&_panel_instance); // 使用するパネルをセットします。
+  }
+};