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annotate Scan/BETKB/scan_loop.c @ 48:8eee22f99cae

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Completing the BETKB support - Keyboard is fully functional - LED, Beeper, and keyboard input not yet implemented
author Jacob Alexander <triplehaata@gmail.com>
date Tue, 27 Mar 2012 00:04:43 -0400
parents 0ee2207c5919
children 37f0411655cd
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1 /* Copyright (C) 2012 by Jacob Alexander
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to deal
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5 * in the Software without restriction, including without limitation the rights
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6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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7 * copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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19 * THE SOFTWARE.
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20 */
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21
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22 // ----- Includes -----
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23
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24 // AVR Includes
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25 #include <avr/interrupt.h>
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26 #include <avr/io.h>
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27 #include <util/delay.h>
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28
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29 // Project Includes
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30 #include <led.h>
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31 #include <print.h>
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32
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33 // Local Includes
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34 #include "scan_loop.h"
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35
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37
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38 // ----- Defines -----
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39
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40 // Pinout Defines
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41 #define RESET_PORT PORTB
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42 #define RESET_DDR DDRD
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43 #define RESET_PIN 0
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44
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45
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46 // ----- Macros -----
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47
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48 // Make sure we haven't overflowed the buffer
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49 #define bufferAdd(byte) \
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50 if ( KeyIndex_BufferUsed < KEYBOARD_BUFFER ) \
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51 KeyIndex_Buffer[KeyIndex_BufferUsed++] = byte
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54
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55 // ----- Variables -----
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56
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57 // Buffer used to inform the macro processing module which keys have been detected as pressed
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58 volatile uint8_t KeyIndex_Buffer[KEYBOARD_BUFFER];
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59 volatile uint8_t KeyIndex_BufferUsed;
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61
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62 // Buffer Signals
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63 volatile uint8_t BufferReadyToClear;
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66
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67 // ----- Function Declarations -----
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68
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69 void processKeyValue( uint8_t keyValue );
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70 void removeKeyValue( uint8_t keyValue );
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73
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74 // ----- Interrupt Functions -----
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75
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76 // USART Receive Buffer Full Interrupt
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77 ISR(USART1_RX_vect)
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78 {
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79 cli(); // Disable Interrupts
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80
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81 uint8_t keyValue = 0x00;
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82 uint8_t keyState = 0x00;
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83
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84 // Read the scancode packet from the USART (1st to 8th bits)
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85 keyValue = UDR1;
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86
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87 // Read the release/press bit (9th bit) XXX Unnecessary, and wrong it seems, parity bit? or something else?
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88 keyState = UCSR1B & 0x02;
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89
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90 // High bit of keyValue, also represents press/release
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91 keyState = keyValue & 0x80 ? 0x00 : 0x02;
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92
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93 // Debug
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94 char tmpStr[6];
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95 hexToStr( keyValue & 0x7F, tmpStr );
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96
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97 // Process the scancode
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98 switch ( keyState )
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99 {
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100 case 0x00: // Released
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101 dPrintStrs( tmpStr, "R " ); // Debug
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102
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103 // Remove key from press buffer
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104 removeKeyValue( keyValue & 0x7F );
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105 break;
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106
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107 case 0x02: // Pressed
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108 dPrintStrs( tmpStr, "P " ); // Debug
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109
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110 // New key to process
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111 processKeyValue( keyValue & 0x7F );
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112 break;
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113 }
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114
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115 sei(); // Re-enable Interrupts
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116 }
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119
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120 // ----- Functions -----
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121
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122 // Setup
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123 inline void scan_setup()
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124 {
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125 // Setup the the USART interface for keyboard data input
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126 // NOTE: The input data signal needs to be inverted for the Teensy USART to properly work
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127
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128 // Setup baud rate
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129 // 16 MHz / ( 16 * Baud ) = UBRR
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130 // Baud <- 0.823284 ms per bit, thus 1000 / 0.823284 = 1214.65004 -> 823.2824
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131 // Thus baud setting = 823
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132 uint16_t baud = 823; // Max setting of 4095
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133 UBRR1H = (uint8_t)(baud >> 8);
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134 UBRR1L = (uint8_t)baud;
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135
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136 // Enable the receiver, transitter, and RX Complete Interrupt as well as 9 bit data
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137 UCSR1B = 0x9C;
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138
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139 // Set frame format: 9 data, 1 stop bit, no parity
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140 // Asynchrounous USART mode
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141 UCSR1C = 0x06;
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142
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143 // Initially buffer doesn't need to be cleared (it's empty...)
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144 BufferReadyToClear = 0;
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145
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146 // Reset the keyboard before scanning, we might be in a wierd state
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147 scan_resetKeyboard();
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148 }
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149
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150
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151 // Main Detection Loop
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152 // Not needed for the BETKB, this is just a busy loop
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153 inline uint8_t scan_loop()
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154 {
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155 return 0;
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156 }
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157
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158 // TODO
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159 void processKeyValue( uint8_t keyValue )
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160 {
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161 // Interpret scan code
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162 switch ( keyValue )
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163 {
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164 default:
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165 // Make sure the key isn't already in the buffer
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166 for ( uint8_t c = 0; c < KeyIndex_BufferUsed + 1; c++ )
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167 {
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168 // Key isn't in the buffer yet
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169 if ( c == KeyIndex_BufferUsed )
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170 {
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171 bufferAdd( keyValue );
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172 break;
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173 }
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174
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175 // Key already in the buffer
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176 if ( KeyIndex_Buffer[c] == keyValue )
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177 break;
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178 }
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179 break;
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180 }
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181 }
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182
48
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183 void removeKeyValue( uint8_t keyValue )
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184 {
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185 // Check for the released key, and shift the other keys lower on the buffer
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186 uint8_t c;
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187 for ( c = 0; c < KeyIndex_BufferUsed; c++ )
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188 {
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189 // Key to release found
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190 if ( KeyIndex_Buffer[c] == keyValue )
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191 {
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192 // Shift keys from c position
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193 for ( uint8_t k = c; k < KeyIndex_BufferUsed - 1; k++ )
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194 KeyIndex_Buffer[k] = KeyIndex_Buffer[k + 1];
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195
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196 // Decrement Buffer
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197 KeyIndex_BufferUsed--;
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198
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199 break;
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200 }
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201 }
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202
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203 // Error case (no key to release)
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204 if ( c == KeyIndex_BufferUsed + 1 )
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205 {
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206 errorLED( 1 );
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207 char tmpStr[6];
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208 hexToStr( keyValue, tmpStr );
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209 erro_dPrint( "Could not find key to release: ", tmpStr );
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210 }
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211 }
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212
47
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213 // Send data
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214 uint8_t scan_sendData( uint8_t dataPayload )
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215 {
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216 UDR1 = dataPayload;
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217 return 0;
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218 }
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219
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220 // Signal KeyIndex_Buffer that it has been properly read
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221 // TODO
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222 void scan_finishedWithBuffer( void )
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223 {
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224 return;
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225 }
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226
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227 // Signal that the keys have been properly sent over USB
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228 // TODO
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229 void scan_finishedWithUSBBuffer( void )
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230 {
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231 }
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232
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233 // Reset/Hold keyboard
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234 // NOTE: Does nothing with the BETKB
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235 void scan_lockKeyboard( void )
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236 {
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237 }
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238
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239 // NOTE: Does nothing with the BETKB
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240 void scan_unlockKeyboard( void )
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241 {
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242 }
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243
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244 // Reset Keyboard
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245 // TODO?
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246 // - Holds the input read line high to flush the buffer
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247 // - This does not actually reset the keyboard, but always seems brings it to a sane state
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248 // - Won't work fully if keys are being pressed done at the same time
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249 void scan_resetKeyboard( void )
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250 {
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251 // Initiate data request line, but don't read the incoming data
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252 //REQUEST_DATA(); TODO
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253
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254 // Not a calculated valued...
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255 _delay_ms( 50 );
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256
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257 // Stop request line
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258 //STOP_DATA(); TODO
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259 }
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260