root / branches / encoders / code / projects / colonet / testing / dongle / robot_receiver / dio.c @ 1390
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1 | 13 | emarinel | /*
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2 | |||
3 | dio.c
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4 | Controls digital input and output
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5 | |||
6 | A general note on how this code works:
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7 | portpin is used to select both the bank and which pin is selected
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8 | 6 bits are used (lower 6, ex: 0b00abcdef)
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9 | the first 3 (abc in this example) are used to select the bank
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10 | A = 001
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11 | B = 010
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12 | C = 011
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13 | D = 100
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14 | E = 101
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15 | F = 110
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16 | G = 111
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17 | |||
18 | the bank can be found by doing portpin >> 3
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19 | |||
20 | the next 3 (def in this example) are used to select the pin number
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21 | the 3 bits are just the binary representation of the pin number
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22 | 0 = 000
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23 | 1 = 001
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24 | 2 = 010
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25 | 3 = 011
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26 | 4 = 100
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27 | 5 = 101
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28 | 6 = 110
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29 | 7 = 111
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30 | |||
31 | the pin number can be found by doing portping & 0b111
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32 | |||
33 | |||
34 | */
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35 | |||
36 | #include <avr/interrupt.h> |
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37 | |||
38 | #include <dio.h> |
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39 | #include <time.h> |
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40 | #include <lights.h> |
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41 | /*
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42 | digital_input
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43 | |||
44 | reads the value on the selected portpin, returns it as 1 or 0
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45 | see general description (above) for definition of portpin
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46 | |||
47 | */
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48 | int digital_input(int portpin){ |
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49 | int pin = portpin & 0x7; |
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50 | int pin_val = 0; |
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51 | |||
52 | switch(portpin >> 3){ |
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53 | case _PORT_A:
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54 | DDRA &= ~_BV(pin); |
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55 | pin_val = PINA; |
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56 | return (pin_val >> pin) & 1; |
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57 | case _PORT_B:
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58 | DDRB &= ~_BV(pin); |
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59 | pin_val = PINB; |
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60 | return (pin_val >> pin) & 1; |
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61 | case _PORT_C:
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62 | DDRC &= ~_BV(pin); |
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63 | pin_val = PINC; |
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64 | return (pin_val >> pin) & 1; |
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65 | case _PORT_D:
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66 | DDRD &= ~_BV(pin); |
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67 | pin_val = PIND; |
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68 | return (pin_val >> pin) & 1; |
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69 | case _PORT_E:
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70 | DDRE &= ~_BV(pin); |
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71 | pin_val = PINE; |
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72 | return (pin_val >> pin) & 1; |
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73 | case _PORT_F:
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74 | if(pin>=4){ |
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75 | MCUSR|=1<<7; |
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76 | MCUSR|=1<<7; |
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77 | } |
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78 | DDRF &= ~_BV(pin); |
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79 | pin_val = PINF; |
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80 | return (pin_val >> pin) & 1; |
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81 | case _PORT_G:
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82 | DDRG &= ~_BV(pin); |
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83 | pin_val = PING; |
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84 | return (pin_val >> pin) & 1; |
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85 | default: break; |
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86 | } |
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87 | |||
88 | return -1; |
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89 | } |
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90 | |||
91 | /*
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92 | digital_pull_up
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93 | Enables pullup on a pin. if pin is output, it will make it output 1.
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94 | |||
95 | */
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96 | void digital_pull_up(int portpin) { |
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97 | int pins = portpin & 0x07; |
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98 | |||
99 | |||
100 | switch(portpin >> 3) { |
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101 | case _PORT_A:
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102 | PORTA |= _BV(pins); |
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103 | break;
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104 | case _PORT_B:
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105 | PORTB |= _BV(pins); |
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106 | break;
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107 | case _PORT_C:
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108 | PORTC |= _BV(pins); |
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109 | break;
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110 | case _PORT_D:
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111 | PORTD |= _BV(pins); |
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112 | break;
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113 | case _PORT_E:
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114 | PORTE |= _BV(pins); |
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115 | break;
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116 | case _PORT_F:
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117 | PORTF |= _BV(pins); |
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118 | break;
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119 | case _PORT_G:
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120 | PORTG |= _BV(pins); |
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121 | break;
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122 | } |
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123 | |||
124 | } |
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125 | |||
126 | /*
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127 | digital_output
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128 | |||
129 | sets portpin to the value
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130 | |||
131 | see general description above for explanation of portpin
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132 | |||
133 | val can only be 0 for off, nonzero for on
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134 | */
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135 | void digital_output(int portpin, int val) { |
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136 | int pins = portpin & 0x07; |
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137 | |||
138 | /*
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139 | if you want to set to 0
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140 | */
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141 | if(val == 0) { |
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142 | switch(portpin >> 3) { |
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143 | case _PORT_A:
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144 | DDRA |= _BV(pins); |
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145 | PORTA &= (0XFF - _BV(pins));
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146 | break;
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147 | case _PORT_B:
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148 | DDRB |= _BV(pins); |
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149 | PORTB &= (0XFF - _BV(pins));
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150 | break;
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151 | case _PORT_C:
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152 | DDRC |= _BV(pins); |
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153 | PORTC &= (0XFF - _BV(pins));
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154 | break;
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155 | case _PORT_D:
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156 | DDRD |= _BV(pins); |
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157 | PORTD &= (0XFF - _BV(pins));
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158 | break;
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159 | case _PORT_E:
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160 | DDRE |= _BV(pins); |
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161 | PORTE &= (0XFF - _BV(pins));
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162 | break;
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163 | case _PORT_F:
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164 | DDRF |= _BV(pins); |
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165 | PORTF &= (0XFF - _BV(pins));
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166 | break;
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167 | case _PORT_G:
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168 | DDRG |= _BV(pins); |
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169 | PORTG &= (0XFF - _BV(pins));
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170 | break;
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171 | } |
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172 | } |
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173 | else { /* ( val == 1) */ |
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174 | switch(portpin >> 3) { |
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175 | case _PORT_A:
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176 | DDRA |= _BV(pins); |
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177 | PORTA |= _BV(pins); |
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178 | break;
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179 | case _PORT_B:
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180 | DDRB |= _BV(pins); |
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181 | PORTB |= _BV(pins); |
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182 | break;
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183 | case _PORT_C:
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184 | DDRC |= _BV(pins); |
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185 | PORTC |= _BV(pins); |
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186 | break;
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187 | case _PORT_D:
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188 | DDRD |= _BV(pins); |
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189 | PORTD |= _BV(pins); |
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190 | break;
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191 | case _PORT_E:
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192 | DDRE |= _BV(pins); |
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193 | PORTE |= _BV(pins); |
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194 | break;
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195 | case _PORT_F:
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196 | DDRF |= _BV(pins); |
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197 | PORTF |= _BV(pins); |
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198 | break;
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199 | case _PORT_G:
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200 | DDRG |= _BV(pins); |
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201 | PORTG |= _BV(pins); |
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202 | break;
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203 | } |
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204 | } |
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205 | } |
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206 | |||
207 | |||
208 | |||
209 | |||
210 | |||
211 | //////////////////////////////////////
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212 | //////////// button1 //////////////
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213 | //////////////////////////////////////
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214 | |||
215 | /*
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216 | return 1 if button is pressed, 0 otherwise
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217 | */
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218 | int button1_read( void ) |
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219 | { |
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220 | //return (BTN & (_BV(BTN1)) >> BTN1);
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221 | return (PIN_BTN >> BTN1) & 1; |
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222 | } |
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223 | |||
224 | /*
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225 | similar to button1_read, but hold program until the button is actually pressed
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226 | */
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227 | void button1_wait( void ) |
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228 | { |
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229 | while(!button1_read() ) {
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230 | delay_ms(15);
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231 | } |
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232 | } |
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233 | |||
234 | |||
235 | /*
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236 | same as button1_wait
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237 | However, blink the led while waiting
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238 | |||
239 | IMPORTANT: This requires that the LED has been initialized ( init_led )
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240 | */
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241 | void button1_wait_led( void ) |
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242 | { |
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243 | int i = 0; |
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244 | |||
245 | while(!button1_read() ) {
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246 | if( i < 8 ) |
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247 | led_user(1);
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248 | else {
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249 | led_user(0);
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250 | } |
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251 | //increment i, but restart when i = 15;
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252 | i = (i+1) & 0xF; |
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253 | delay_ms(15);
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254 | } |
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255 | |||
256 | led_user(0);
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257 | } |
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258 | |||
259 | |||
260 | //////////////////////////////////////
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261 | //////////// button2 //////////////
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262 | //////////////////////////////////////
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263 | //see button1 functions for descriptions
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264 | //same except for which button is used
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265 | int button2_read( void ) |
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266 | { |
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267 | return (PIN_BTN >> BTN2) & 1; |
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268 | } |
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269 | |||
270 | void button2_wait( void ) |
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271 | { |
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272 | while(!button2_read() ) {
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273 | delay_ms(15);
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274 | } |
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275 | } |
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276 | |||
277 | |||
278 | void button2_wait_led( void ) |
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279 | { |
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280 | int i = 0; |
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281 | |||
282 | while(!button2_read() ) {
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283 | if( i < 8 ) |
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284 | led_user(1);
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285 | else {
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286 | led_user(0);
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287 | } |
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288 | //increment i, but restart when i = 15;
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289 | i = (i+1) & 0xF; |
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290 | delay_ms(15);
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291 | } |
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292 | |||
293 | led_user(0);
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294 | } |
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295 | |||
296 | /*
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297 | // EXTERNAL INTERRUPTS
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298 | /// example code to be used by anyone in need
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299 | /// this example has 2 bump sensors on PE6 and PE7
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300 | |||
301 | // left touch sensor on PE6
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302 | SIGNAL (SIG_INTERRUPT6)
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303 | {
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304 | putcharlcd('6');
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305 | }
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306 | |||
307 | // right touch sensor on PE7
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308 | SIGNAL (SIG_INTERRUPT7)
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309 | {
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310 | putcharlcd('7');
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311 | }
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312 | */ |