…

src/keyer.cpp

@@ -1,11 +1,31 @@
+#include <stdio.h>
+
+#include "pico/stdlib.h"
+
 #include "keyer.h"
 
+extern const uint LEFT_PADDLE_PIN;
+
+bool left_paddle_pressed()
+{
+    if (gpio_get(LEFT_PADDLE_PIN))
+    {
+        return true;
+    }
+    return false;
+}
+
 void Keyer::run()
 {
     switch (state)
     {
-    case State::WAIT:
-        // do nothing
+    case State::Wait:
+        if (left_paddle_pressed())
+            state = State::LeftPaddlePressed;
+        break;
+    case State::LeftPaddlePressed:
+        printf(".");
+        state = State::Wait;
         break;
 
     default:

src/keyer.h

@@ -6,13 +6,15 @@ class Keyer final
 public:
     enum class State
     {
-        WAIT
+        Wait,
+        LeftPaddlePressed,
+
     };
 
     void run();
 
 private:
-    State state{State::WAIT};
+    State state{State::Wait};
 };
 
 #endif

src/pico_keyer.cpp

@@ -8,9 +8,10 @@
 namespace
 {
     const uint LED_PIN = PICO_DEFAULT_LED_PIN;
-    const uint LEFT_PADDLE_PIN = 14;
+    
     const uint RIGHT_PADDLE_PIN = 15;
 }
+extern const uint LEFT_PADDLE_PIN = 14;
 
 void setup()
 {
@@ -45,7 +46,7 @@ int main()
 
     while (true)
     {
-        sleep_ms(10);
+        sleep_ms(1.2 * settings.wpm);
         keyer.run();
     }