--- /dev/null
+/* Copyright (C) 2011 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 <avr/interrupt.h>
+
+// Project Includes
+#include <led.h>
+#include <print.h>
+
+// Local Includes
+#include "scan_loop.h"
+
+
+
+// ----- Defines -----
+
+// Pinout Defines
+#define CLK_READ PIND
+#define CLK_PORT PORTD
+#define CLK_DDR DDRD
+#define CLK_PIN 1
+
+#define DATA_READ PIND
+#define DATA_PORT PORTD
+#define DATA_DDR DDRD
+#define DATA_PIN 0
+
+#define INTR_PORT PORTD
+#define INTR_DDR DDRD
+#define INTR_PIN 0
+
+
+
+// ----- Macros -----
+#define READ_CLK CLK_READ & (1 << CLK_PIN) ? 1 : 0
+#define READ_DATA DATA_READ & (1 << DATA_PIN) ? 0 : 1
+
+#define UNSET_INTR() INTR_DDR &= ~(1 << INTR_PIN)
+#define SET_INTR() INTR_DDR |= (1 << INTR_PIN)
+
+
+
+// ----- Variables -----
+
+uint8_t KeyIndex_Array[KEYBOARD_SIZE + 1];
+
+// Scan Code Retrieval Variables
+uint8_t inputData = 0xFF;
+uint8_t packet_index = 0;
+
+
+
+// ----- Functions -----
+
+// Setup
+inline void scan_setup()
+{
+ // Setup inputs
+ CLK_DDR &= ~(1 << CLK_PIN);
+ DATA_DDR &= ~(1 << DATA_PIN);
+
+ // Setup Pull-up's
+ CLK_PORT &= ~(1 << CLK_PIN); // (CLK)
+ DATA_PORT &= ~(1 << DATA_PIN); // (/DATA)
+
+ // Setup Keyboard Interrupt
+ INTR_DDR &= ~(1 << INTR_PIN);
+ INTR_PORT &= ~(1 << INTR_PIN);
+
+ /* Interrupt Style (Not working fully)
+ cli();
+ // Setup interrupt on the CLK pin TODO Better defines
+ EICRA |= 0x03; // Rising Edge Interrupt
+ EIMSK |= (1 << INT0);
+
+ // Setup interrupt on the DATA pin TODO Better defines
+ EICRA |= 0x08; // Falling Edge Interrupt
+ EIMSK |= (1 << INT1);
+ sei();
+ */
+}
+
+
+// Main Detection Loop
+inline uint8_t scan_loop()
+{
+ /*
+ // Packet Read
+ if ( packet_index == 8 )
+ {
+ // Disable Error LED, proper key found
+ errorLED( 0 );
+
+//#ifdef MAX_DEBUG
+ // Crazy Debug (Read the Scan Code)
+ char tmpStr[3];
+ hexToStr_op( inputData, tmpStr, 2 );
+ dPrintStrsNL( "Read Data: 0x", tmpStr );
+//#endif
+ // - Map the scan code to the index array -
+ // If the 8th bit is high, remove the keypress, else, add the keypress
+ // The lower 7 bits are the array index
+ KeyIndex_Array[(inputData & 0x7F)] = (inputData & 0x80) ? 0x00 : 0x80;
+
+ // Reset Containers
+ packet_index = 0;
+ inputData = 0xFF;
+ }
+ // Bad Packet
+ else if ( packet_index > 8 )
+ {
+ // Signal Error
+ errorLED( 1 );
+
+ char tmpStr[3];
+ int8ToStr( packet_index, tmpStr );
+ erro_dPrint( "Big packet? Mismatched... ", tmpStr );
+
+ packet_index = 0;
+ inputData = 0xFF;
+ }
+ */
+
+ // Disable keyboard interrupt (does nothing if already off)
+ UNSET_INTR();
+
+ // Read the clock 8 times
+ if ( READ_CLK )
+ {
+ // Mis-read packet, set back to 0
+ if ( packet_index == -1 )
+ packet_index = 0;
+
+ // Append 1 bit of data
+ inputData &= ~(READ_DATA << packet_index);
+ packet_index++;
+
+ // 8 Bits have been read
+ if ( packet_index == 8 )
+ {
+ // Wait till clock edge falls
+ while ( READ_CLK );
+
+ // Sample both lines to make sure this is not a data value
+ // and definitely the end of packet data blip
+ uint16_t badDataCounter = 0;
+ while ( !( READ_DATA ) && !( READ_CLK ) )
+ badDataCounter++;
+
+ if ( badDataCounter < 25 )
+ {
+//#ifdef MAX_DEBUG
+ // Crazy Debug (Read the Scan Code)
+ char tmpStr[3];
+ hexToStr_op( inputData, tmpStr, 2 );
+ dbug_dPrint( "Read Data: 0x", tmpStr );
+//#endif
+ // - Map the scan code to the index array -
+ // If the 8th bit is high, remove the keypress, else, add the keypress
+ // The lower 7 bits are the array index
+ KeyIndex_Array[(inputData & 0x7F)] = (inputData & 0x80) ? 0x00 : 0x80;
+ }
+ // Even though this is a mis-read packet, we still know what the value is
+ else
+ {
+ // Signal Error
+ errorLED( 1 );
+ char tmpStr[3];
+ hexToStr_op( inputData, tmpStr, 2 );
+ erro_dPrint( "Bad packet? Mismatched... 0x", tmpStr );
+ }
+
+ // Reset Containers
+ inputData = 0xFF;
+ packet_index = 0;
+
+ // Interrupt the keyboard, so we don't get packet pieces...
+ SET_INTR();
+
+ // Do not wait for next clock, let USB do it's thing (if desired)
+ return packet_index;
+ }
+
+ // Wait till clock edge falls
+ while ( READ_CLK );
+ }
+
+ // Interrupt keyboard if there is no pending packet
+ SET_INTR();
+
+ return packet_index;
+}
+
+// Detection interrupt, signalled by a clock pulse from CLK_PIN
+ISR(INT0_vect)
+{
+ //cli(); // Disable Interrupts
+
+ // Append 1 bit of data
+ //inputData &= ~(READ_DATA << packet_index);
+ packet_index++;
+
+ //sei(); // Re-enable Interrupts
+}
+
+// Data Detected
+ISR(INT1_vect)
+{
+ // Append 1 bit of data
+ inputData &= ~(1 << packet_index);
+ packet_index++;
+
+ // Disable Clk Signal (Not needed if there's a data signal)
+ EIFR |= (1 << INTF0);
+}
+
+
+
projects / kiibohd-controller.git / blobdiff