67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
//=============================================================================
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// iR Hackpad Demo Firmware
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// Compile for Arduino Leonardo
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//=============================================================================
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// The Arduino Keyboard library creates a HID keyboard interface to send keyboard scancodes to the host.
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// For convenience, the class takes ASCII characters via Keyboard::write(), which are automatically
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// converted to the corresponding keboard scan-codes according to the keyboard layout passed to
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// Keyboard::begin(). On the host side, the scan-codes are again converted to characters by the OS.
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#include "Keyboard.h"
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//=============================================================================
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// Our key matrix (see schematics)
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const int N_rows = 5;
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const int N_cols = 4;
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const int gpio_rows[N_rows] = { 6, 7, 8, 9, 5 };
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const int gpio_cols[N_cols] = { 15, 14, 16, 10 };
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// Key function assignment: ASCII characters or special function codes (see Keyboard.h)
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const int key_matrix[N_rows][N_cols] = {
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{'a', 'b', 'c', 'd'}, // 4x4 keypad
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{'e', 'f', 'g', 'h'},
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{'i', 'j', 'k', 'l'},
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{'m', 'n', 'o', 'p'},
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{'_', '_', '_', 'x'} // rotery encoder button
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};
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int is_pressed[N_rows][N_cols] = { 0 };
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const uint32_t KEY_SCAN_DELAY_US = 100; // Delay between row scans
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//=============================================================================
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void setup()
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{
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for (int col=0; col<N_cols; col++) {
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pinMode(gpio_cols[col], INPUT_PULLUP); // Key matrix columns as inputs
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}
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for (int row=0; row<N_rows; row++) {
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digitalWrite(gpio_rows[row], HIGH);
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pinMode(gpio_rows[row], OUTPUT); // Key matrix rows as outputs
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}
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Keyboard.begin(KeyboardLayout_de_DE);
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Serial.begin(9600); // Open serial port to host, so the IDE can reset the device for reprogramming
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}
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//=============================================================================
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void loop()
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{
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for (int row=0; row<N_rows; row++) {
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digitalWrite(gpio_rows[row], LOW);
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for (int col=0; col<N_cols; col++) {
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if (digitalRead(gpio_cols[col]) == LOW){
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is_pressed[row][col] = true;
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Keyboard.press(key_matrix[row][col]);
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} else if (is_pressed[row][col]) {
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Keyboard.release(key_matrix[row][col]);
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is_pressed[row][col] = false;
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}
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delayMicroseconds(KEY_SCAN_DELAY_US); // Give the column inputs time to reach HIGH state (slow recharge via weak pullups)
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}
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digitalWrite(gpio_rows[row], HIGH);
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}
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}
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//=============================================================================
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