/* Copyright (C) 2013 by Jacob Alexander * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ // ----- Includes ----- // AVR Includes #include #include #include // Project Includes #include #include // Local Includes #include "scan_loop.h" // ----- Defines ----- // Pinout Defines #define HOLD_PORT PORTD #define HOLD_DDR DDRD #define HOLD_PIN 3 // ----- Macros ----- // Make sure we haven't overflowed the buffer #define bufferAdd(byte) \ if ( KeyIndex_BufferUsed < KEYBOARD_BUFFER ) \ KeyIndex_Buffer[KeyIndex_BufferUsed++] = byte // ----- Variables ----- // Buffer used to inform the macro processing module which keys have been detected as pressed volatile uint8_t KeyIndex_Buffer[KEYBOARD_BUFFER]; volatile uint8_t KeyIndex_BufferUsed; volatile uint8_t KeyIndex_Add_InputSignal; // Used to pass the (click/input value) to the keyboard for the clicker // Buffer Signals volatile uint8_t BufferReadyToClear; // ----- Function Declarations ----- void processKeyValue( uint8_t keyValue ); void removeKeyValue( uint8_t keyValue ); // ----- Interrupt Functions ----- // USART Receive Buffer Full Interrupt ISR(USART1_RX_vect) { cli(); // Disable Interrupts uint8_t keyValue = 0x00; uint8_t keyState = 0x00; // Read the scancode packet from the USART (1st to 8th bits) keyValue = UDR1; // Read the release/press bit (9th bit) XXX Unnecessary, and wrong it seems, parity bit? or something else? keyState = UCSR1B & 0x02; // High bit of keyValue, also represents press/release keyState = keyValue & 0x80 ? 0x00 : 0x02; // Debug char tmpStr[6]; hexToStr( keyValue & 0x7F, tmpStr ); // Process the scancode switch ( keyState ) { case 0x00: // Released dPrintStrs( tmpStr, "R " ); // Debug // Remove key from press buffer removeKeyValue( keyValue & 0x7F ); break; case 0x02: // Pressed dPrintStrs( tmpStr, "P " ); // Debug // New key to process processKeyValue( keyValue & 0x7F ); break; } sei(); // Re-enable Interrupts } // ----- Functions ----- // Setup inline void scan_setup() { // Setup the the USART interface for keyboard data input // NOTE: The input data signal needs to be inverted for the Teensy USART to properly work // Setup baud rate // 16 MHz / ( 16 * Baud ) = UBRR // Baud <- 0.823284 ms per bit, thus 1000 / 0.823284 = 1214.65004 -> 823.2824 // Thus baud setting = 823 uint16_t baud = 823; // Max setting of 4095 UBRR1H = (uint8_t)(baud >> 8); UBRR1L = (uint8_t)baud; // Enable the receiver, and RX Complete Interrupt as well as 9 bit data UCSR1B = 0x94; // The transmitter is only to be enabled when needed // Set the pin to be pull-up otherwise (use the lowered voltage inverter in order to sink) HOLD_DDR &= ~(1 << HOLD_PIN); HOLD_PORT |= (1 << HOLD_PIN); // Set frame format: 9 data, 1 stop bit, no parity // Asynchrounous USART mode UCSR1C = 0x06; // Initially buffer doesn't need to be cleared (it's empty...) BufferReadyToClear = 0; // InputSignal is off by default KeyIndex_Add_InputSignal = 0x00; // Reset the keyboard before scanning, we might be in a wierd state scan_resetKeyboard(); } // Main Detection Loop // Not needed for the BETKB, this is just a busy loop inline uint8_t scan_loop() { return 0; } void processKeyValue( uint8_t keyValue ) { // Interpret scan code switch ( keyValue ) { case 0x00: // Break code from input? break; default: // Make sure the key isn't already in the buffer for ( uint8_t c = 0; c < KeyIndex_BufferUsed + 1; c++ ) { // Key isn't in the buffer yet if ( c == KeyIndex_BufferUsed ) { bufferAdd( keyValue ); // Only send data if enabled if ( KeyIndex_Add_InputSignal ) scan_sendData( KeyIndex_Add_InputSignal ); break; } // Key already in the buffer if ( KeyIndex_Buffer[c] == keyValue ) break; } break; } } void removeKeyValue( uint8_t keyValue ) { // Check for the released key, and shift the other keys lower on the buffer uint8_t c; for ( c = 0; c < KeyIndex_BufferUsed; c++ ) { // Key to release found if ( KeyIndex_Buffer[c] == keyValue ) { // Shift keys from c position for ( uint8_t k = c; k < KeyIndex_BufferUsed - 1; k++ ) KeyIndex_Buffer[k] = KeyIndex_Buffer[k + 1]; // Decrement Buffer KeyIndex_BufferUsed--; break; } } // Error case (no key to release) if ( c == KeyIndex_BufferUsed + 1 ) { errorLED( 1 ); char tmpStr[6]; hexToStr( keyValue, tmpStr ); erro_dPrint( "Could not find key to release: ", tmpStr ); } } // Send data uint8_t scan_sendData( uint8_t dataPayload ) { // Enable the USART Transmitter UCSR1B |= (1 << 3); // Debug char tmpStr[6]; hexToStr( dataPayload, tmpStr ); info_dPrint( "Sending - ", tmpStr ); UDR1 = dataPayload; // Wait for the payload _delay_us( 800 ); // Disable the USART Transmitter UCSR1B &= ~(1 << 3); return 0; } // Signal KeyIndex_Buffer that it has been properly read void scan_finishedWithBuffer( void ) { } // Signal that the keys have been properly sent over USB void scan_finishedWithUSBBuffer( void ) { } // Reset/Hold keyboard // NOTE: Does nothing with the BETKB void scan_lockKeyboard( void ) { } // NOTE: Does nothing with the BETKB void scan_unlockKeyboard( void ) { } // Reset Keyboard void scan_resetKeyboard( void ) { // Not a calculated valued... _delay_ms( 50 ); }