Add expression pedal support on GPIO5 (CC 4)

2026-07-02 04:00:06 +00:00
parent ae2891fca8
commit 08d6fc8701
3 changed files with 88 additions and 1 deletions
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <cstdint>
+
+class UsbMidiTransport;
+
+class ExpressionPedal {
+public:
+    ExpressionPedal(uint8_t adc_pin = 5);
+
+    void begin();
+    void update(UsbMidiTransport& midi);
+    uint8_t get_value() const { return current_value; }
+
+private:
+    uint8_t adc_pin;
+    uint8_t current_value;
+    uint8_t last_sent_value;
+    uint8_t midi_channel;
+    uint8_t midi_cc;
+
+    static const uint8_t HYSTERESIS = 3;
+    static const uint16_t READ_INTERVAL_MS = 20;
+    uint32_t last_read_time;
+
+    uint8_t adc_to_midi(uint16_t adc_value);
+};