added simple arduino firmware

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Nico Stuhlmueller 2023-04-15 19:25:21 +02:00
parent 1963c65a6b
commit 6e524e8de4

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