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2 | /* This project is targetted at the VUSBDev hacking board. */
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3 |
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4 | #include <avr/io.h>
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5 | #include <avr/interrupt.h>
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6 | #include <avr/wdt.h>
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7 | #include <avr/pgmspace.h>
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8 | #include <util/delay.h>
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9 |
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10 | #include <string.h>
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11 | #include <stdbool.h>
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12 |
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13 | #include "usbdrv/usbdrv.h"
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14 | #include "shared.h"
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15 |
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16 | // IO pins:
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17 | // PIC <> AVR
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18 | // PGC PB3
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19 | // PGD PB2
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20 | // PGM PB1
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21 | // VPP PB0
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22 | // VDD VCC
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23 | // VSS GND
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24 | #define PGC 8
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25 | #define PGD 4
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26 | #define PGM 2
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27 | #define VPP 1
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28 |
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29 | // VUSB leds (PD6 and PD7)
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30 | #define RED 64
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31 | #define GREEN 128
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32 |
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33 | // TODO is it wise to use a timer or two for bit patterns generation ? (see
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34 | // CrO2 architecture)
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35 | //
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36 | // As usual the SPI, TWI and USART are not useable, because we need 6 and 16 bit
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37 | // communcations in the ICSP protocol. So we are bit banging bhe ICSP protocol.
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38 | // Timers may make it easier to do that in parallel with the USB handling, since
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39 | // timings are in the nanosecond range.
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40 |
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41 |
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42 | uint8_t command;
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43 | uint16_t ICSP_data;
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44 |
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45 |
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46 | int main() {
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47 | // Init
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48 | wdt_enable(WDTO_2S);
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49 |
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50 | // USB
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51 | usbInit();
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52 | sei();
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53 |
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54 | // Enter Low Voltage ICSP mode on the PIC
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55 | PORTB &= ~(VPP|PGM|PGD|PGC); // Start with all pin low
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56 | DDRB |= VPP|PGM|PGD|PGC; // set them as outputs
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57 | _delay_us(4); // Wait for some time
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58 | PORTB |= PGM; // Enable low voltage programming
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59 | PORTB |= VPP; // Enter programming mode
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60 |
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61 | // Configure leds
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62 | DDRD |= RED | GREEN;
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63 | PORTD |= RED | GREEN;
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64 |
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65 | int k = 0;
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66 |
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67 | while(1) {
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68 | if (k-- < 0)
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69 | {
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70 | k = 20000;
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71 | PORTD ^= RED;
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72 | }
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73 | wdt_reset();
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74 | usbPoll();
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75 | }
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76 | }
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77 |
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78 |
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79 | void ICSP_command(uint8_t cmd)
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80 | {
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81 | for(int i = 6; --i>= 0;)
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82 | {
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83 | if(cmd & 1)
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84 | PORTB |= PGD;
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85 | else
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86 | PORTB &= ~PGD;
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87 | PORTB |= PGC;
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88 | PORTB &= ~PGC;
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89 |
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90 | cmd >>= 1;
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91 | }
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92 |
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93 | _delay_us(1);
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94 | }
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95 |
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96 |
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97 | void ICSP_write(uint8_t cmd, uint16_t data)
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98 | {
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99 | ICSP_command(cmd);
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100 |
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101 | // send data
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102 | for(int i = 16; --i>= 0;)
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103 | {
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104 | if(data & 1)
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105 | PORTB |= PGD;
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106 | else
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107 | PORTB &= ~PGD;
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108 | PORTB |= PGC;
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109 | PORTB &= ~PGC;
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110 |
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111 | data >>= 1;
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112 | }
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113 | _delay_us(1);
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114 | }
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115 |
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116 |
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117 | void ICSP_read(uint8_t cmd, uint16_t *const data)
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118 | {
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119 | ICSP_command(cmd);
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120 |
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121 | // PGD as input
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122 | DDRB &= ~PGD;
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123 | PORTB |= PGD; //pull up
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124 |
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125 | // get data
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126 | for(int i = 16; --i>= 0;)
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127 | {
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128 | PORTB |= PGC;
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129 | *data |= (PINB & PGD) / PGD;
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130 | PORTB &= ~PGC;
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131 |
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132 | *data <<= 1;
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133 | }
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134 | _delay_us(1);
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135 |
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136 | // PGD as output
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137 | PORTB &= ~PGD;
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138 | DDRB |= PGD;
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139 | }
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140 |
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141 |
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142 | uint8_t usbFunctionSetup(uint8_t data[8]) {
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143 | usbRequest_t *rq = (void *)data;
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144 |
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145 | PORTD &= ~GREEN;
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146 |
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147 | if ((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_VENDOR)
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148 | switch(rq->bRequest)
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149 | {
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150 | /* HOST to DEVICE data transfers requests */
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151 | case LoadConfigWord:
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152 | case LoadCodeWord:
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153 | case LoadDataWord:
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154 | {
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155 | // TODO check there is only and exactly 16 bits of data
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156 |
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157 | /* Read the 16-bit data */
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158 | ICSP_data = (rq->wValue.bytes[0] << 8) | rq->wValue.bytes[0];
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159 | command = rq->bRequest;
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160 |
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161 | // send the command and data
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162 | ICSP_write(command, ICSP_data);
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163 |
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164 | // Return the number of bytes we wrote (none here)
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165 | PORTD |= GREEN;
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166 | return 0;
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167 | }
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168 |
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169 | /* CONFIGURATION commands (no data is transferred) */
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170 | case NextAddress:
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171 | case BeginEraseProgram:
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172 | case BeginProgramOnly:
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173 | case BulkEraseCode:
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174 | case BulkEraseData:
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175 | case BulkEraseConfig1:
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176 | case BulkEraseConfig2:
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177 | {
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178 | command = rq->bRequest;
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179 |
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180 | // send the command
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181 | ICSP_write(command, 0);
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182 |
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183 | PORTD |= GREEN;
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184 | return 0;
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185 | }
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186 |
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187 | /* DEVICE to HOST data transfers requests */
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188 | case ReadCodeWord:
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189 | case ReadDataWord:
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190 | {
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191 | command = rq->bRequest;
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192 | // TODO send the command and get the result
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193 | ICSP_read(command, &ICSP_data);
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194 | usbMsgPtr = (uint8_t*)&ICSP_data;
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195 |
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196 | PORTD |= GREEN;
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197 | return 2; // We send 2 bytes back
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198 | }
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199 | }
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200 |
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201 | // Unhandled commands leave the green led on.
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202 | return 0;
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203 | }
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204 |
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