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src/otg/report_desc.rs Normal file
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//! HID Report Descriptors
/// Keyboard HID Report Descriptor with LED output support
/// Report format (8 bytes input):
/// [0] Modifier keys (8 bits)
/// [1] Reserved
/// [2-7] Key codes (6 keys)
/// LED output (1 byte):
/// Bit 0: Num Lock
/// Bit 1: Caps Lock
/// Bit 2: Scroll Lock
/// Bit 3: Compose
/// Bit 4: Kana
pub const KEYBOARD_WITH_LED: &[u8] = &[
0x05, 0x01, // Usage Page (Generic Desktop)
0x09, 0x06, // Usage (Keyboard)
0xA1, 0x01, // Collection (Application)
// Modifier keys input (8 bits)
0x05, 0x07, // Usage Page (Key Codes)
0x19, 0xE0, // Usage Minimum (224) - Left Control
0x29, 0xE7, // Usage Maximum (231) - Right GUI
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x75, 0x01, // Report Size (1)
0x95, 0x08, // Report Count (8)
0x81, 0x02, // Input (Data, Variable, Absolute) - Modifier byte
// Reserved byte
0x95, 0x01, // Report Count (1)
0x75, 0x08, // Report Size (8)
0x81, 0x01, // Input (Constant) - Reserved byte
// LED output (5 bits)
0x95, 0x05, // Report Count (5)
0x75, 0x01, // Report Size (1)
0x05, 0x08, // Usage Page (LEDs)
0x19, 0x01, // Usage Minimum (1) - Num Lock
0x29, 0x05, // Usage Maximum (5) - Kana
0x91, 0x02, // Output (Data, Variable, Absolute) - LED bits
// LED padding (3 bits)
0x95, 0x01, // Report Count (1)
0x75, 0x03, // Report Size (3)
0x91, 0x01, // Output (Constant) - Padding
// Key array (6 bytes)
0x95, 0x06, // Report Count (6)
0x75, 0x08, // Report Size (8)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x00, // Logical Maximum (255)
0x05, 0x07, // Usage Page (Key Codes)
0x19, 0x00, // Usage Minimum (0)
0x2A, 0xFF, 0x00, // Usage Maximum (255)
0x81, 0x00, // Input (Data, Array) - Key array (6 keys)
0xC0, // End Collection
];
/// Relative Mouse HID Report Descriptor (4 bytes report)
/// Report format:
/// [0] Buttons (5 bits) + padding (3 bits)
/// [1] X movement (signed 8-bit)
/// [2] Y movement (signed 8-bit)
/// [3] Wheel (signed 8-bit)
pub const MOUSE_RELATIVE: &[u8] = &[
0x05, 0x01, // Usage Page (Generic Desktop)
0x09, 0x02, // Usage (Mouse)
0xA1, 0x01, // Collection (Application)
0x09, 0x01, // Usage (Pointer)
0xA1, 0x00, // Collection (Physical)
// Buttons (5 bits)
0x05, 0x09, // Usage Page (Button)
0x19, 0x01, // Usage Minimum (1)
0x29, 0x05, // Usage Maximum (5) - 5 buttons
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x95, 0x05, // Report Count (5)
0x75, 0x01, // Report Size (1)
0x81, 0x02, // Input (Data, Variable, Absolute) - Button bits
// Padding (3 bits)
0x95, 0x01, // Report Count (1)
0x75, 0x03, // Report Size (3)
0x81, 0x01, // Input (Constant) - Padding
// X, Y movement
0x05, 0x01, // Usage Page (Generic Desktop)
0x09, 0x30, // Usage (X)
0x09, 0x31, // Usage (Y)
0x15, 0x81, // Logical Minimum (-127)
0x25, 0x7F, // Logical Maximum (127)
0x75, 0x08, // Report Size (8)
0x95, 0x02, // Report Count (2)
0x81, 0x06, // Input (Data, Variable, Relative) - X, Y
// Wheel
0x09, 0x38, // Usage (Wheel)
0x15, 0x81, // Logical Minimum (-127)
0x25, 0x7F, // Logical Maximum (127)
0x75, 0x08, // Report Size (8)
0x95, 0x01, // Report Count (1)
0x81, 0x06, // Input (Data, Variable, Relative) - Wheel
0xC0, // End Collection
0xC0, // End Collection
];
/// Absolute Mouse HID Report Descriptor (6 bytes report)
/// Report format:
/// [0] Buttons (5 bits) + padding (3 bits)
/// [1-2] X position (16-bit, 0-32767)
/// [3-4] Y position (16-bit, 0-32767)
/// [5] Wheel (signed 8-bit)
pub const MOUSE_ABSOLUTE: &[u8] = &[
0x05, 0x01, // Usage Page (Generic Desktop)
0x09, 0x02, // Usage (Mouse)
0xA1, 0x01, // Collection (Application)
0x09, 0x01, // Usage (Pointer)
0xA1, 0x00, // Collection (Physical)
// Buttons (5 bits)
0x05, 0x09, // Usage Page (Button)
0x19, 0x01, // Usage Minimum (1)
0x29, 0x05, // Usage Maximum (5) - 5 buttons
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x95, 0x05, // Report Count (5)
0x75, 0x01, // Report Size (1)
0x81, 0x02, // Input (Data, Variable, Absolute) - Button bits
// Padding (3 bits)
0x95, 0x01, // Report Count (1)
0x75, 0x03, // Report Size (3)
0x81, 0x01, // Input (Constant) - Padding
// X position (16-bit absolute)
0x05, 0x01, // Usage Page (Generic Desktop)
0x09, 0x30, // Usage (X)
0x16, 0x00, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x7F, // Logical Maximum (32767)
0x75, 0x10, // Report Size (16)
0x95, 0x01, // Report Count (1)
0x81, 0x02, // Input (Data, Variable, Absolute) - X
// Y position (16-bit absolute)
0x09, 0x31, // Usage (Y)
0x16, 0x00, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x7F, // Logical Maximum (32767)
0x75, 0x10, // Report Size (16)
0x95, 0x01, // Report Count (1)
0x81, 0x02, // Input (Data, Variable, Absolute) - Y
// Wheel
0x09, 0x38, // Usage (Wheel)
0x15, 0x81, // Logical Minimum (-127)
0x25, 0x7F, // Logical Maximum (127)
0x75, 0x08, // Report Size (8)
0x95, 0x01, // Report Count (1)
0x81, 0x06, // Input (Data, Variable, Relative) - Wheel
0xC0, // End Collection
0xC0, // End Collection
];
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_report_descriptor_sizes() {
assert!(!KEYBOARD_WITH_LED.is_empty());
assert!(!MOUSE_RELATIVE.is_empty());
assert!(!MOUSE_ABSOLUTE.is_empty());
}
}