Add drum pad input handling

CMakeLists.txt

@@ -13,7 +13,8 @@ add_compile_options(-Wall -Wextra -Werror)
 
 add_subdirectory(libs)
 
-file(GLOB ${PROJECT_NAME}_SOURCES src/*.cpp)
+file(GLOB ${PROJECT_NAME}_SOURCES src/*.cpp src/utils/*.cpp
+     src/peripherals/*.cpp)
 
 add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_SOURCES})
 

include/GlobalConfiguration.h

@@ -0,0 +1,26 @@
+#ifndef _GLOBALCONFIGURATION_H_
+#define _GLOBALCONFIGURATION_H_
+
+#include "peripherals/Drum.h"
+
+namespace Doncon::Config::Default {
+
+const Peripherals::Drum::Config drum_config = {
+    // Pin config
+    {
+        4, // Don Left Weak
+        3, // Ka Left Weak
+        2, // Don Right Weak
+        1, // Ka Right Weak
+
+        6,  // Don Left Strong
+        29, // Ka Left Strong
+        7,  // Don Right Strong
+        0,  // Ka Right Strong
+    },
+    10, // Debounce delay in milliseconds
+};
+
+} // namespace Doncon::Config::Default
+
+#endif // _GLOBALCONFIGURATION_H_

include/peripherals/Drum.h

@@ -0,0 +1,70 @@
+#ifndef _PERIPHERALS_DRUM_H_
+#define _PERIPHERALS_DRUM_H_
+
+#include "utils/InputState.h"
+
+#include <map>
+#include <stdint.h>
+
+namespace Doncon::Peripherals {
+
+class Drum {
+  public:
+    struct Config {
+        struct {
+            uint8_t don_left_weak;
+            uint8_t ka_left_weak;
+            uint8_t don_right_weak;
+            uint8_t ka_right_weak;
+
+            uint8_t don_left_strong;
+            uint8_t ka_left_strong;
+            uint8_t don_right_strong;
+            uint8_t ka_right_strong;
+        } pins;
+
+        uint8_t debounce_delay_ms;
+    };
+
+  private:
+    enum class Id {
+        DON_LEFT_WEAK,
+        KA_LEFT_WEAK,
+        DON_RIGHT_WEAK,
+        KA_RIGHT_WEAK,
+        DON_LEFT_STRONG,
+        KA_LEFT_STRONG,
+        DON_RIGHT_STRONG,
+        KA_RIGHT_STRONG,
+    };
+
+    class Pad {
+      private:
+        uint8_t gpio_pin;
+        uint32_t gpio_mask;
+
+        uint32_t last_change;
+        bool active;
+
+      public:
+        Pad(uint8_t pin);
+
+        uint8_t getGpioPin() const { return gpio_pin; };
+        uint32_t getGpioMask() const { return gpio_mask; };
+
+        bool getState() const { return active; };
+        void setState(bool state, uint8_t debounce_delay);
+    };
+
+    Config m_config;
+    std::map<Id, Pad> m_pads;
+
+  public:
+    Drum(const Config &config);
+
+    void updateInputState(Utils::InputState &input_state);
+};
+
+} // namespace Doncon::Peripherals
+
+#endif // _PERIPHERALS_DRUM_H_

include/utils/InputState.h

@@ -0,0 +1,23 @@
+#ifndef _UTILS_INPUTSTATE_H_
+#define _UTILS_INPUTSTATE_H_
+
+#include <stdint.h>
+
+namespace Doncon::Utils {
+
+struct InputState {
+  public:
+    struct Drum {
+        bool don_left, ka_left, don_right, ka_right;
+    };
+
+  public:
+    Drum drum;
+
+  public:
+    InputState();
+};
+
+} // namespace Doncon::Utils
+
+#endif // _UTILS_INPUTSTATE_H_

src/main.cpp

@@ -1,11 +1,35 @@
+#include "peripherals/Drum.h"
+
+#include "GlobalConfiguration.h"
+
 #include "pico/stdlib.h"
 
 #include <stdio.h>
 
+using namespace Doncon;
+
 int main() {
+    Utils::InputState input_state;
+    Peripherals::Drum drum(Config::Default::drum_config);
+
     stdio_init_all();
 
     while (true) {
-        sleep_ms(1);
+        drum.updateInputState(input_state);
+
+        if (input_state.drum.don_left) {
+            printf("DON LEFT\n");
+        }
+        if (input_state.drum.don_right) {
+            printf("DON RIGHT\n");
+        }
+        if (input_state.drum.ka_left) {
+            printf("KA LEFT\n");
+        }
+        if (input_state.drum.ka_right) {
+            printf("KA RIGHT\n");
+        }
     }
+
+    return 0;
 }

src/peripherals/Drum.cpp

@@ -0,0 +1,63 @@
+#include "peripherals/Drum.h"
+
+#include "hardware/gpio.h"
+#include "pico/time.h"
+
+namespace Doncon::Peripherals {
+
+Drum::Pad::Pad(uint8_t pin) : gpio_pin(pin), gpio_mask(1 << pin), last_change(0), active(false) {}
+
+void Drum::Pad::setState(bool state, uint8_t debounce_delay) {
+    if (active == state) {
+        return;
+    }
+
+    // Immediately change the input state, but only allow a change every debounce_delay milliseconds.
+    uint32_t now = to_ms_since_boot(get_absolute_time());
+    if (last_change + debounce_delay <= now) {
+        active = state;
+        last_change = now;
+    }
+}
+
+Drum::Drum(const Config &config) : m_config(config) {
+    m_pads.emplace(Id::DON_LEFT_WEAK, config.pins.don_left_weak);
+    m_pads.emplace(Id::KA_LEFT_WEAK, config.pins.ka_left_weak);
+    m_pads.emplace(Id::DON_RIGHT_WEAK, config.pins.don_right_weak);
+    m_pads.emplace(Id::KA_RIGHT_WEAK, config.pins.ka_right_weak);
+    m_pads.emplace(Id::DON_LEFT_STRONG, config.pins.don_left_strong);
+    m_pads.emplace(Id::KA_LEFT_STRONG, config.pins.ka_left_strong);
+    m_pads.emplace(Id::DON_RIGHT_STRONG, config.pins.don_right_strong);
+    m_pads.emplace(Id::KA_RIGHT_STRONG, config.pins.ka_right_strong);
+
+    for (const auto &button : m_pads) {
+        gpio_init(button.second.getGpioPin());
+        gpio_set_dir(button.second.getGpioPin(), GPIO_IN);
+        gpio_pull_up(button.second.getGpioPin());
+    }
+}
+
+void Drum::updateInputState(Utils::InputState &input_state) {
+    uint32_t gpio_state = ~gpio_get_all();
+
+    for (auto &button : m_pads) {
+        button.second.setState(gpio_state & button.second.getGpioMask(), m_config.debounce_delay_ms);
+    }
+
+    input_state.drum.don_left = m_pads.at(Id::DON_LEFT_WEAK).getState() ||   //
+                                m_pads.at(Id::DON_LEFT_STRONG).getState() || //
+                                m_pads.at(Id::DON_RIGHT_STRONG).getState();
+
+    input_state.drum.ka_left = m_pads.at(Id::KA_LEFT_WEAK).getState() ||   //
+                               m_pads.at(Id::KA_LEFT_STRONG).getState() || //
+                               m_pads.at(Id::KA_RIGHT_STRONG).getState();
+
+    input_state.drum.don_right = m_pads.at(Id::DON_RIGHT_WEAK).getState() ||  //
+                                 m_pads.at(Id::DON_LEFT_STRONG).getState() || //
+                                 m_pads.at(Id::DON_RIGHT_STRONG).getState();
+
+    input_state.drum.ka_right = m_pads.at(Id::KA_RIGHT_WEAK).getState() ||  //
+                                m_pads.at(Id::KA_LEFT_STRONG).getState() || //
+                                m_pads.at(Id::KA_RIGHT_STRONG).getState();
+}
+} // namespace Doncon::Peripherals

src/utils/InputState.cpp

@@ -0,0 +1,7 @@
+#include "utils/InputState.h"
+
+namespace Doncon::Utils {
+
+InputState::InputState() : drum({false, false, false, false}) {}
+
+} // namespace Doncon::Utils