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1 | 7 | bcoltin | /*
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2 | dio.c
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3 | */
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4 | |||
5 | #include <avr/interrupt.h> |
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6 | #include <dio.h> |
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7 | #include <time.h> |
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8 | #include <lights.h> |
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9 | |||
10 | /**
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11 | * @defgroup dio Digital Input / Output
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12 | * @brief Controls digital input and output
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13 | *
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14 | * A general note on how port / pin numbers work:<br>
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15 | * The portpin is used to select both the bank and which pin is selected.
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16 | * 6 bits are used (lower 6, ex: 0b00abcdef).
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17 | * The first 3 (abc in this example) are used to select the bank.<br>
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18 | * A = 001<br>
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19 | * B = 010<br>
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20 | * C = 011<br>
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21 | * D = 100<br>
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22 | * E = 101<br>
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23 | * F = 110<br>
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24 | * G = 111<br><br>
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25 | *
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26 | * The bank can be found by doing portpin >> 3. <br>
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27 | *
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28 | * The next three (def in this example) are used to select the pin number.
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29 | * These three bits are just the binary representation of the pin number.<br>
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30 | * <br>
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31 | * The pin number can be found by doing portpin & 0b111.<br><br>
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32 | *
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33 | * Include dio.h to access these functions.
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34 | **/
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35 | |||
36 | /**
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37 | * Reads the selected portpin.
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38 | *
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39 | * @param portpin The portpin to be read. See the general description
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40 | * for a description of portpins.
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41 | *
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42 | * @return 1 or 0, depending on the value of the portpin.
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43 | **/
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44 | int digital_input(int portpin){ |
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45 | int pin = portpin & 0x7; |
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46 | int pin_val = 0; |
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47 | |||
48 | switch(portpin >> 3){ |
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49 | case _PORT_A:
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50 | DDRA &= ~_BV(pin); |
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51 | pin_val = PINA; |
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52 | return (pin_val >> pin) & 1; |
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53 | case _PORT_B:
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54 | DDRB &= ~_BV(pin); |
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55 | pin_val = PINB; |
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56 | return (pin_val >> pin) & 1; |
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57 | case _PORT_C:
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58 | DDRC &= ~_BV(pin); |
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59 | pin_val = PINC; |
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60 | return (pin_val >> pin) & 1; |
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61 | case _PORT_D:
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62 | DDRD &= ~_BV(pin); |
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63 | pin_val = PIND; |
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64 | return (pin_val >> pin) & 1; |
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65 | case _PORT_E:
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66 | DDRE &= ~_BV(pin); |
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67 | pin_val = PINE; |
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68 | return (pin_val >> pin) & 1; |
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69 | case _PORT_F:
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70 | if(pin>=4){ |
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71 | MCUSR|=1<<7; |
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72 | MCUSR|=1<<7; |
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73 | } |
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74 | DDRF &= ~_BV(pin); |
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75 | pin_val = PINF; |
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76 | return (pin_val >> pin) & 1; |
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77 | case _PORT_G:
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78 | DDRG &= ~_BV(pin); |
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79 | pin_val = PING; |
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80 | return (pin_val >> pin) & 1; |
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81 | default: break; |
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82 | } |
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83 | |||
84 | return -1; |
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85 | } |
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86 | |||
87 | /**
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88 | * Enables pullup on a pin. If it is an output pin, the pin will output
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89 | * 1.
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90 | *
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91 | * @param portpin the pin to enable pullup on. See the general description
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92 | * for a discussion of portpins.
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93 | **/
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94 | void digital_pull_up(int portpin) { |
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95 | int pins = portpin & 0x07; |
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96 | |||
97 | switch(portpin >> 3) { |
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98 | case _PORT_A:
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99 | PORTA |= _BV(pins); |
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100 | break;
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101 | case _PORT_B:
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102 | PORTB |= _BV(pins); |
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103 | break;
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104 | case _PORT_C:
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105 | PORTC |= _BV(pins); |
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106 | break;
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107 | case _PORT_D:
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108 | PORTD |= _BV(pins); |
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109 | break;
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110 | case _PORT_E:
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111 | PORTE |= _BV(pins); |
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112 | break;
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113 | case _PORT_F:
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114 | PORTF |= _BV(pins); |
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115 | break;
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116 | case _PORT_G:
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117 | PORTG |= _BV(pins); |
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118 | break;
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119 | } |
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120 | } |
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121 | |||
122 | /**
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123 | * Sets portpin to the given value.
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124 | *
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125 | * @param portpin the portpin to output to. See the general
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126 | * description for a discussion of portpins.
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127 | *
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128 | * @param val the value to set the portpin to. 0 for off,
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129 | * nonzero for on.
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130 | **/
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131 | void digital_output(int portpin, int val) { |
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132 | int pins = portpin & 0x07; |
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133 | |||
134 | /* if you want to set to 0... */
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135 | if(val == 0) { |
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136 | switch(portpin >> 3) { |
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137 | case _PORT_A:
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138 | DDRA |= _BV(pins); |
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139 | PORTA &= (0XFF - _BV(pins));
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140 | break;
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141 | case _PORT_B:
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142 | DDRB |= _BV(pins); |
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143 | PORTB &= (0XFF - _BV(pins));
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144 | break;
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145 | case _PORT_C:
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146 | DDRC |= _BV(pins); |
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147 | PORTC &= (0XFF - _BV(pins));
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148 | break;
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149 | case _PORT_D:
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150 | DDRD |= _BV(pins); |
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151 | PORTD &= (0XFF - _BV(pins));
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152 | break;
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153 | case _PORT_E:
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154 | DDRE |= _BV(pins); |
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155 | PORTE &= (0XFF - _BV(pins));
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156 | break;
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157 | case _PORT_F:
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158 | DDRF |= _BV(pins); |
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159 | PORTF &= (0XFF - _BV(pins));
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160 | break;
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161 | case _PORT_G:
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162 | DDRG |= _BV(pins); |
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163 | PORTG &= (0XFF - _BV(pins));
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164 | break;
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165 | } |
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166 | }else { /* ( val == 1) */ |
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167 | switch(portpin >> 3) { |
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168 | case _PORT_A:
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169 | DDRA |= _BV(pins); |
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170 | PORTA |= _BV(pins); |
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171 | break;
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172 | case _PORT_B:
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173 | DDRB |= _BV(pins); |
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174 | PORTB |= _BV(pins); |
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175 | break;
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176 | case _PORT_C:
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177 | DDRC |= _BV(pins); |
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178 | PORTC |= _BV(pins); |
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179 | break;
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180 | case _PORT_D:
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181 | DDRD |= _BV(pins); |
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182 | PORTD |= _BV(pins); |
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183 | break;
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184 | case _PORT_E:
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185 | DDRE |= _BV(pins); |
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186 | PORTE |= _BV(pins); |
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187 | break;
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188 | case _PORT_F:
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189 | DDRF |= _BV(pins); |
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190 | PORTF |= _BV(pins); |
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191 | break;
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192 | case _PORT_G:
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193 | DDRG |= _BV(pins); |
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194 | PORTG |= _BV(pins); |
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195 | break;
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196 | } |
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197 | } |
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198 | } |
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199 | |||
200 | /**
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201 | * Checks if button1 is currently pressed.
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202 | *
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203 | * @return 1 if button1 is pressed, 0 otherwise
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204 | *
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205 | * @see button1_wait, button1_click
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206 | **/
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207 | int button1_read( void ) |
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208 | { |
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209 | int pin_val;
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210 | DDRG &= ~_BV(PING0); |
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211 | PORTG|= _BV(PING0); |
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212 | pin_val = PING; |
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213 | return !((pin_val & _BV(PING0)));
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214 | |||
215 | } |
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216 | |||
217 | /**
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218 | * Delays execution until button1 is pressed.
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219 | *
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220 | * @see button1_read, button1_click
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221 | **/
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222 | void button1_wait( void ) |
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223 | { |
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224 | while(!button1_read() ) {
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225 | delay_ms(15);
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226 | } |
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227 | } |
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228 | |||
229 | /**
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230 | * If button1 is pressed, waits until it is released before returning.
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231 | * Otherwise, the function returns immediately.
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232 | *
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233 | * @return 1 if button1 has been pressed, 0 otherwise
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234 | *
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235 | * @see button1_read, button1_wait
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236 | **/
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237 | int button1_click()
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238 | { |
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239 | if(button1_read()){
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240 | while(button1_read());
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241 | return 1; |
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242 | }else{
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243 | return 0; |
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244 | } |
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245 | } |
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246 | |||
247 | /**
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248 | * Checks if button2 is currently pressed.
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249 | *
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250 | * @return 1 if button2 is pressed, 0 otherwise
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251 | *
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252 | * @see button2_wait, button2_click
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253 | **/
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254 | int button2_read( void ) |
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255 | { |
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256 | int pin_val;
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257 | DDRG &= ~_BV(PING1); |
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258 | PORTG|= _BV(PING1); |
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259 | pin_val = PING; |
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260 | return !((pin_val & _BV(PING1)));
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261 | } |
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262 | |||
263 | /**
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264 | * Delays execution until button2 is pressed.
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265 | *
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266 | * @see button2_read, button2_click
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267 | **/
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268 | void button2_wait( void ) |
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269 | { |
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270 | while(!button2_read()){
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271 | delay_ms(15);
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272 | } |
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273 | } |
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274 | |||
275 | /**
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276 | * If button2 is pressed, waits until it is released before returning.
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277 | * Otherwise, the function returns immediately.
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278 | *
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279 | * @return 1 if button2 has been pressed, 0 otherwise
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280 | *
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281 | * @see button2_read, button2_wait
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282 | **/
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283 | int button2_click()
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284 | { |
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285 | if(button2_read()){
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286 | while(button2_read());
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287 | return 1; |
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288 | }else{
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289 | return 0; |
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290 | } |
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291 | } |
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292 | |||
293 | /** @} **/ //end defgroup |