rename chapters

Chapter17/cib/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);
+    }
+};
+};