Toggle keying modes

src/raspikeyer.cpp

@@ -1,6 +1,8 @@
 #include <cmath>
 #include <stdio.h>
 
+#include <type_traits>
+
 #include "bsp/board.h"
 #include "hardware/adc.h"
 #include "pico/binary_info/code.h"
@@ -26,6 +28,7 @@ extern constexpr uint BUZZER_PIN = 18;
 constexpr uint DISPLAY_DIO_PIN = 20;
 constexpr uint DISPLAY_CLK_PIN = 21;
 extern constexpr uint ADC_PIN = 26;
+constexpr uint BUTTON_KEYER_MODE = 2;
 
 queue_t keyerQueue;
 
@@ -47,6 +50,11 @@ void setup()
     gpio_set_dir(CW_OUT_PIN, GPIO_OUT);
     gpio_put(CW_OUT_PIN, 0);
 
+    // Setup Button Keyer Mode
+    gpio_init(BUTTON_KEYER_MODE);
+    gpio_set_dir(BUTTON_KEYER_MODE, GPIO_IN);
+    gpio_pull_down(BUTTON_KEYER_MODE);
+
     // Setup ADC
     adc_init();
     gpio_init(ADC_PIN);
@@ -131,7 +139,12 @@ int main()
     display.displayIambicMode(settings.mode);
     display.displaySpeed(currentWpm);
 
+    auto timestamp = get_absolute_time();
+    auto ignoreButtonKeyerModeUntil = timestamp;
+    uint count = static_cast<std::underlying_type<Mode>::type>(settings.mode); // TODO: Simplify with C++23
+
     while (true) {
+        timestamp = get_absolute_time();
         currentWpm = calcWPM(potiRead(), settings.wpmPotiMin, settings.wpmPotiMax);
 
         // If WPM in settings is set to 0 -> take speed from poti
@@ -143,6 +156,33 @@ int main()
             display.displaySpeed(currentWpm);
         }
 
+        // If Button for keying mode is pressed, toggle through the possible values (Iambic A, Iambic B, Straight)
+        if (absolute_time_diff_us(timestamp, ignoreButtonKeyerModeUntil) <= 0 && gpio_get(BUTTON_KEYER_MODE)) {
+            ++count;
+            count = count % 3;
+
+            switch (count) {
+            case 0:
+                settings.mode = Mode::IambicA;
+                break;
+            case 1:
+                settings.mode = Mode::IambicB;
+                break;
+            case 2:
+                settings.mode = Mode::Straight;
+                break;
+            default:
+                break;
+            }
+
+            KeyerQueueData keyerQueueData {KeyerQueueCommand::Config, currentWpm, settings.mode, 0};
+            queue_add_blocking(&keyerQueue, &keyerQueueData);
+
+            display.displayIambicMode(settings.mode);
+
+            ignoreButtonKeyerModeUntil = make_timeout_time_us(500'000);
+        }
+
         tud_task(); // Internal PICO purposes
 
         winKeyer.run(keyerQueue);