implement relais and lcd as modules

Does NOT compile!
Problem might be on the side of the ARM compiler.

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.13)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_CXX_STANDARD 20)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wno-volatile")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wno-volatile -fmodules-ts")
 
 # Initialise pico_sdk from installed location
 # (note this can come from environment, CMake cache etc)

src/CMakeLists.txt

@@ -1,10 +1,12 @@
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 configure_file(${CMAKE_CURRENT_LIST_DIR}/config.h.in ${CMAKE_CURRENT_BINARY_DIR}/config.h)
 
+#add_compile_options(-fmodules-ts)
+
 set(SOURCES
-    gbmanager.cpp
     lcd.cpp
     relais.cpp
+    gbmanager.cpp
 )
 
 # Add executable. Default name is the project name, version 0.1

src/gbmanager.cpp

@@ -5,8 +5,10 @@
 #include "pico/stdlib.h"
 
 #include "config.h"
-#include "lcd.h"
-#include "relais.h"
+//#include "lcd.h"
+
+import lcd;
+import relais;
 
 // GPIOs used
 constexpr uint I2C_SDA_PIN = 26;
@@ -28,7 +30,7 @@ absolute_time_t lastPressed = get_absolute_time();
 
 using std::string;
 
-void buttonPressedCallback(uint gpio, uint32_t events) {
+void buttonPressedCallback(uint gpio, [[maybe_unused]] uint32_t events) {
     absolute_time_t now = get_absolute_time();
     if (absolute_time_diff_us(lastPressed, now) < 750000) {
         return;
@@ -54,7 +56,7 @@ int main() {
     stdio_init_all();
 
     // Initialize the LCD
-    auto myLCD = LCD(i2c1, I2C_SDA_PIN, I2C_SCL_PIN);
+    auto myLCD = LCD(i2c1, I2C_SDA_PIN, I2C_SCL_PIN, 16, 2);
     myLCD.clear();
 
     // Initialize the temp sensor

src/lcd.cpp

@@ -1,6 +1,12 @@
-#include "pico/binary_info.h"
+module;
 
-#include "lcd.h"
+#include <string>
+
+#include "hardware/i2c.h"
+#include "pico/binary_info.h"
+#include "pico/stdlib.h"
+
+export module lcd;
 
 // commands
 constexpr int LCD_CLEARDISPLAY = 0x01;
@@ -29,9 +35,15 @@ constexpr int LCD_8BITMODE = 0x10;
 constexpr int LCD_BACKLIGHT = 0x08;
 constexpr int LCD_ENABLE_BIT = 0x04;
 
-LCD::LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
-         const uint8_t i2c_addr, uint8_t num_cols, uint8_t num_lines)
-    : i2c{i2c}, i2c_addr{i2c_addr}, num_cols{num_cols}, num_lines{num_lines} {
+enum class Mode { COMMAND, CHARACTER };
+
+export class LCD {
+  public:
+    LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
+        const uint8_t i2c_addr, const uint8_t num_cols = 16,
+        const uint8_t num_lines = 2)
+        : i2c{i2c}, i2c_addr{i2c_addr}, num_cols{num_cols}, num_lines{
+                                                                num_lines} {
         i2c_init(i2c, 400 * 1000);
         gpio_set_function(gpio_sda, GPIO_FUNC_I2C);
         gpio_set_function(gpio_scl, GPIO_FUNC_I2C);
@@ -51,17 +63,7 @@ LCD::LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
         clear();
     }
 
-// Go to location on LCD
-void LCD::setCursor(int line, int position) {
-    int val = (line == 0) ? 0x80 + position : 0xC0 + position;
-    sendByte(val, Mode::COMMAND);
-    cursor_x = line;
-    cursor_y = position;
-}
-
-void LCD::sendChar(char val) { sendByte(val, Mode::CHARACTER); }
-
-void LCD::sendString(const std::string &str) {
+    void sendString(const std::string &str) {
         for (const char &c : str) {
             if (c == '\n') {
                 cursor_y++;
@@ -73,13 +75,24 @@ void LCD::sendString(const std::string &str) {
         }
     }
 
-void LCD::clear() { sendByte(LCD_CLEARDISPLAY, Mode::COMMAND); }
+    // Go to location on LCD
+    void setCursor(int line, int position) {
+        int val = (line == 0) ? 0x80 + position : 0xC0 + position;
+        sendByte(val, Mode::COMMAND);
+        cursor_x = line;
+        cursor_y = position;
+    }
 
-void LCD::i2cWriteByte(uint8_t val) {
+    void clear() { sendByte(LCD_CLEARDISPLAY, Mode::COMMAND); }
+
+  private:
+    void sendChar(char val) { sendByte(val, Mode::CHARACTER); }
+
+    void i2cWriteByte(uint8_t val) {
         i2c_write_blocking(i2c, i2c_addr, &val, 1, false);
     }
 
-void LCD::toggleEnable(uint8_t val) {
+    void toggleEnable(uint8_t val) {
         // Toggle enable pin on LCD display
         // We cannot do this too quickly or things don't work
         constexpr uint64_t DELAY_US = 600;
@@ -91,12 +104,21 @@ void LCD::toggleEnable(uint8_t val) {
     }
 
     // The display is sent a byte as two separate nibble transfers
-void LCD::sendByte(uint8_t val, Mode mode) {
+    void sendByte(uint8_t val, Mode mode) {
         uint8_t high = static_cast<int>(mode) | (val & 0xF0) | LCD_BACKLIGHT;
-    uint8_t low = static_cast<int>(mode) | ((val << 4) & 0xF0) | LCD_BACKLIGHT;
+        uint8_t low =
+            static_cast<int>(mode) | ((val << 4) & 0xF0) | LCD_BACKLIGHT;
 
         i2cWriteByte(high);
         toggleEnable(high);
         i2cWriteByte(low);
         toggleEnable(low);
     }
+
+    i2c_inst_t *i2c;
+    uint8_t i2c_addr;
+    uint8_t num_cols;
+    uint8_t num_lines;
+    uint8_t cursor_x{0};
+    uint8_t cursor_y{0};
+};

src/relais.cpp

@@ -1,13 +1,24 @@
-#include "relais.h"
+module;
 
-Relais::Relais(uint gpio) : gpio{gpio} {
+#include "hardware/gpio.h"
+#include "pico/stdlib.h"
+
+export module relais;
+
+export class Relais {
+  public:
+    Relais(uint gpio) : gpio{gpio} {
         gpio_init(gpio);
         gpio_set_dir(gpio, GPIO_OUT);
         off();
     }
 
-void Relais::activate(bool active) { gpio_put(gpio, !active); }
+    void activate(bool active) { gpio_put(gpio, !active); }
 
-void Relais::on() { activate(true); }
+    void on() { activate(true); }
 
-void Relais::off() { activate(false); }
+    void off() { activate(false); }
+
+  private:
+    uint gpio;
+};