add Chapter11

Chapter11/compile_time/hal/gpio/inc/gpio.hpp

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+#pragma once
+
+#include <cstdint>
+#include <functional>
+
+//#include <gpio_interrupt_handler.hpp>
+
+namespace hal
+{
+class gpio
+{
+public:
+    gpio(const std::function<void()> & on_press = nullptr);
+    void execute_interrupt_handler() const;
+
+    [[nodiscard]] virtual bool is_interrupt_generated() const = 0;
+    virtual void clear_interrupt_flag() const = 0;
+private:
+    std::function<void()> on_press_;
+};
+}; // namespace hal

Chapter11/compile_time/hal/gpio/inc/gpio_interrupt_manager.hpp

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+#pragma once
+
+#include <array>
+#include <cstdint>
+
+#include <gpio.hpp>
+
+namespace hal {
+
+    struct gpio_interrupt_manager {
+        static void register_interrupt_handler(gpio * pin);
+
+        static void execute_interrupt_handlers();
+
+        static constexpr std::size_t c_gpio_handlers_num = 16;
+        static inline std::array<gpio*, c_gpio_handlers_num> gpio_handlers{};
+        static inline std::size_t w_idx = 0;
+    };
+};

Chapter11/compile_time/hal/gpio/inc/gpio_stm32.hpp

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+#include <gpio.hpp>
+
+#include <stm32f072xb.h>
+
+namespace hal {
+
+enum class pin : uint16_t {
+        p_invalid = 0,
+        p0 = 0x0001U,
+        p1 = 0x0002U,
+        p2 = 0x0004U,
+        p3 = 0x0008U,
+        p4 = 0x0010U,
+        p5 = 0x0020U,
+        p6 = 0x0040U,
+        p7 = 0x0080U,
+        p8 = 0x0100U,
+        p9 = 0x0200U,
+        p10 = 0x0400U,
+        p11 = 0x0800U,
+        p12 = 0x1000U,
+        p13 = 0x2000U,
+        p14 = 0x4000U,
+        p15 = 0x8000U,
+        all = 0xFFFFU
+};
+
+struct port_a {
+    static constexpr uint8_t c_pin_num = 16;
+    static inline GPIO_TypeDef * port = reinterpret_cast<GPIO_TypeDef*>(GPIOA);
+    static void init_clock () {
+        __HAL_RCC_GPIOA_CLK_ENABLE();
+    }
+};
+
+template<typename Port>
+class gpio_stm32 : public gpio {
+public:
+    gpio_stm32(pin the_pin, const std::function<void()> & on_press = nullptr) 
+    : gpio(on_press), the_pin_(the_pin) {
+        Port::init_clock();
+
+        GPIO_InitTypeDef GPIO_InitStruct { static_cast<uint16_t>(the_pin),
+                                            GPIO_MODE_IT_RISING,
+                                            GPIO_NOPULL,
+                                            GPIO_SPEED_FREQ_LOW,
+                                            0 };
+        HAL_GPIO_Init(Port::port, &GPIO_InitStruct);
+
+        if(on_press) {
+            enable_interrupt();
+        }
+    }
+
+    [[nodiscard]] bool is_interrupt_generated() const override {
+        return __HAL_GPIO_EXTI_GET_IT(static_cast<uint16_t>(the_pin_));
+    }
+    void clear_interrupt_flag() const override {
+        __HAL_GPIO_EXTI_CLEAR_IT(static_cast<uint16_t>(the_pin_));
+    }
+private:
+    pin the_pin_ = pin::p_invalid;
+
+    void enable_interrupt() {
+        // TODO: check EXTI line macro according to pin used
+        HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
+        HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);
+    }
+};
+};

Chapter11/compile_time/hal/gpio/src/gpio.cpp

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+#include <gpio.hpp>
+#include <gpio_interrupt_manager.hpp>
+
+namespace hal {
+
+gpio::gpio(const std::function<void()> & on_press) {
+    on_press_ = on_press;
+    gpio_interrupt_manager::register_interrupt_handler(this);
+}
+
+void gpio::execute_interrupt_handler () const {
+    if(is_interrupt_generated())
+    {
+        clear_interrupt_flag();
+        if(on_press_) {
+            on_press_();
+        }
+    }
+}
+
+};

Chapter11/compile_time/hal/gpio/src/gpio_interrupt_manager.cpp

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+#include <gpio_interrupt_manager.hpp>
+
+namespace hal {
+
+void gpio_interrupt_manager::register_interrupt_handler(gpio * pin) {
+    gpio_handlers.at(w_idx++) = pin;
+}
+
+void gpio_interrupt_manager::execute_interrupt_handlers() {
+    for(std::size_t i = 0; i < w_idx; i++) {
+        gpio_handlers[i]->execute_interrupt_handler();
+    }
+}
+extern "C" void EXTI4_15_IRQHandler(void) {
+    gpio_interrupt_manager::execute_interrupt_handlers();
+}
+};

Chapter11/compile_time/hal/inc/hal.hpp

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+#pragma once
+
+#include <cstdint>
+
+#include <stm32f0xx_hal.h>
+
+namespace hal
+{
+inline void init()
+{
+    HAL_Init();
+}
+
+inline std::uint32_t get_pc() 
+{
+    std::uint32_t pc;
+    __asm volatile ("mov %0, pc" : "=r" (pc) );
+    return pc;
+}
+
+struct time
+{
+    static std::uint32_t get_ms()
+    {
+        return HAL_GetTick();
+    }
+
+    static void delay_ms(uint32_t delay) 
+    {
+        HAL_Delay(delay);
+    }
+};
+}; // namespace hal

Chapter11/compile_time/hal/uart/inc/uart.hpp

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+#pragma once
+
+#include <cstdint>
+
+#include <span>
+
+namespace hal
+{
+class uart
+{
+  public:
+    virtual void init(std::uint32_t baudrate) = 0;
+    virtual void write_array(const char * ptr, std::size_t len) = 0;
+
+    virtual void write(std::span<const char> data)
+    {
+      write_array(data.data(), data.size());
+    }
+};
+}; // namespace hal

Chapter11/compile_time/hal/uart/inc/uart_stm32.hpp

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+#pragma once
+
+#include <span>
+
+#include <cstdint>
+
+#include <uart.hpp>
+
+#include <stm32f0xx_hal.h>
+#include <stm32f072xb.h>
+
+namespace hal
+{
+class uart_stm32 : public uart
+{
+  public:
+    uart_stm32(USART_TypeDef *inst);
+
+    void init(std::uint32_t baudrate = c_baudrate_default) override;
+
+    void write_array(const char * ptr, std::size_t len) override;
+
+  private:
+    UART_HandleTypeDef huart_;
+    USART_TypeDef *instance_;
+    std::uint32_t baudrate_;
+    static constexpr std::uint32_t c_baudrate_default = 115200;
+};
+}; // namespace hal

Chapter11/compile_time/hal/uart/src/uart_stm32.cpp

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+#include <uart_stm32.hpp>
+
+hal::uart_stm32::uart_stm32(USART_TypeDef *inst)
+    : instance_(inst)
+{
+}
+
+void hal::uart_stm32::init(std::uint32_t baudrate)
+{
+    huart_.Instance = instance_;
+    huart_.Init.BaudRate = baudrate;
+    huart_.Init.WordLength = UART_WORDLENGTH_8B;
+    huart_.Init.StopBits = UART_STOPBITS_1;
+    huart_.Init.Parity = UART_PARITY_NONE;
+    huart_.Init.Mode = UART_MODE_TX_RX;
+    huart_.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    huart_.Init.OverSampling = UART_OVERSAMPLING_16;
+    huart_.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
+    huart_.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
+    // TODO: add GPIO initialization for real hardware
+    huart_.MspInitCallback = nullptr;
+    HAL_UART_Init(&huart_);
+}
+
+void hal::uart_stm32::write_array(const char * ptr, std::size_t len)
+{
+    // we must cast away costness due to ST HAL's API
+    char * data_ptr = const_cast<char *>(ptr);
+    HAL_UART_Transmit(&huart_, reinterpret_cast<uint8_t *>(data_ptr), len,
+                      HAL_MAX_DELAY);
+}