root / trunk / code / lib / src / libdragonfly / serial.c @ 241
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1 | 241 | bcoltin | /**
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2 | * Copyright (c) 2007 Colony Project
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3 | *
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4 | * Permission is hereby granted, free of charge, to any person
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5 | * obtaining a copy of this software and associated documentation
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6 | * files (the "Software"), to deal in the Software without
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7 | * restriction, including without limitation the rights to use,
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8 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | * copies of the Software, and to permit persons to whom the
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10 | * Software is furnished to do so, subject to the following
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11 | * conditions:
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12 | *
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13 | * The above copyright notice and this permission notice shall be
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14 | * included in all copies or substantial portions of the Software.
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15 | *
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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18 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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23 | * OTHER DEALINGS IN THE SOFTWARE.
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24 | **/
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25 | 7 | bcoltin | |
26 | 241 | bcoltin | |
27 | /**
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28 | * @file serial.c
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29 | * @brief Serial Input and Output
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30 | *
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31 | * Implementation of functions for serial input and output.
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32 | *
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33 | * @author Colony Project, CMU Robotics Club
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34 | **/
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35 | |||
36 | 7 | bcoltin | #include <avr/io.h> |
37 | #include <stdio.h> |
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38 | #include "serial.h" |
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39 | |||
40 | FILE *usb_fd; //For use with fprintf() and related stdio functions
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41 | FILE *xbee_fd; //For use with fprintf() and related stdio functions
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42 | |||
43 | /**
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44 | * Initializes communication over the USB serial port.
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45 | * This must be called before any other usb function
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46 | * may be used.
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47 | **/
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48 | void usb_init() {
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49 | //Set baud rate
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50 | // - 115200 (both wired and wireless) is UBRR=8, U2X=1
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51 | // - 9600 is U2X =1, UBRR = 107.
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52 | #if (USB_BAUD == 115200) |
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53 | UBRR0H = 0x00;
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54 | UBRR0L = 8;
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55 | UCSR0A |= _BV(U2X0); |
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56 | #elif (USB_BAUD == 9600) |
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57 | UBRR0H = 0x00;
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58 | UBRR0L = 103;
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59 | UCSR0A |= _BV(U2X0); |
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60 | #else //Baud rate is defined in the header file, we should not get here |
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61 | return;
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62 | #endif
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63 | |||
64 | /*Enable receiver and transmitter */
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65 | UCSR0B |= (1<<RXEN0)|(1<<TXEN0); |
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66 | |||
67 | /* Set frame format: 8data, 1stop bit, asynchronous normal mode */
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68 | UCSR0C |= (1<<UCSZ00) | (1<<UCSZ01); |
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69 | |||
70 | // if we have enabled the stdio stuff, then we init it here
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71 | #ifdef USE_STDIO
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72 | /* Open the stdio stream corresponding to this port */
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73 | usb_fd = fdevopen(usb_putc, usb_getc); |
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74 | #endif
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75 | } |
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76 | |||
77 | /**
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78 | * Initializes communication over the XBee.
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79 | * This must be called before any other xbee function
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80 | * may be used.
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81 | **/
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82 | void xbee_init() {
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83 | //Set baud rate
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84 | // - 115200 (both wired and wireless) is UBRR=8, U2X=1
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85 | // - 9600 is U2X =1, UBRR = 107.
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86 | #if (XBEE_BAUD == 115200) |
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87 | UBRR1H = 0x00;
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88 | UBRR1L = 8;
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89 | UCSR1A |= _BV(U2X1); |
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90 | #elif (XBEE_BAUD == 9600) |
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91 | UBRR1H = 0x00;
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92 | UBRR1L = 103;
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93 | UCSR1A |= _BV(U2X1); |
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94 | #else //Baud rate is defined in the header file, we should not get here |
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95 | return;
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96 | #endif
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97 | |||
98 | //Enable receiver and transmitter
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99 | UCSR1B |= (1<<RXEN1)|(1<<TXEN1); |
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100 | |||
101 | // Set frame format: 8data, 1stop bit, asynchronous normal mode
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102 | UCSR1C |= (1<<UCSZ10) | (1<<UCSZ11); |
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103 | |||
104 | // if we have enabled the stdio stuff, then we init it here
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105 | #ifdef USE_STDIO
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106 | /* Open the stdio stream corresponding to this port */
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107 | xbee_fd = fdevopen(xbee_putc, xbee_getc); |
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108 | #endif
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109 | } |
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110 | |||
111 | /**
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112 | * Sends a character over USB.
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113 | *
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114 | * @param c the character to send
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115 | * @return 0 for success, nonzero for failure
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116 | **/
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117 | int usb_putc(char c) |
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118 | { |
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119 | // Wait until buffer is clear for sending
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120 | loop_until_bit_is_set(UCSR0A, UDRE0); |
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121 | |||
122 | // Load buffer with your character
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123 | UDR0 = c; |
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124 | return 0; |
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125 | } |
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126 | |||
127 | /**
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128 | * Sends a character to the XBee.
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129 | *
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130 | * @param c the character to send
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131 | * @return 0 for success, nonzero for failure
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132 | **/
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133 | int xbee_putc(char c) |
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134 | { |
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135 | // Wait until buffer is clear for sending
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136 | loop_until_bit_is_set(UCSR1A, UDRE1); |
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137 | |||
138 | // Load buffer with your character
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139 | UDR1 = c; |
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140 | return 0; |
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141 | } |
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142 | |||
143 | /**
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144 | * Sends a sequence of characters over USB.
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145 | *
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146 | * @param s the string to send
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147 | * @return 0 for success, nonzero for failure
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148 | **/
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149 | int usb_puts(char *s) |
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150 | { |
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151 | char *t = s;
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152 | while (*t != 0) |
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153 | { |
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154 | usb_putc(*t); |
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155 | t++; |
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156 | } |
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157 | return 0; |
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158 | } |
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159 | |||
160 | /**
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161 | * Returns the first character in the buffer received from USB.
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162 | * This function blocks execution until a character has been received.
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163 | * xbee_init must be called before this function may be used.
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164 | *
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165 | * @return the first character in the usb buffer
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166 | *
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167 | * @see usb_init, usb_getc_nb
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168 | **/
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169 | int usb_getc(void) |
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170 | { |
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171 | 241 | bcoltin | // Wait for the receive buffer to be filled
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172 | loop_until_bit_is_set(UCSR0A, RXC0); |
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173 | 7 | bcoltin | |
174 | // Read the receive buffer
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175 | return UDR0;
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176 | } |
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177 | |||
178 | /**
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179 | * Returns the first character in the buffer received from USB.
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180 | * This function blocks execution until a character has been
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181 | * received. xbee_init must be called before this function
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182 | * may be used.
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183 | *
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184 | * @return the first character in the xbee buffer
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185 | *
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186 | * @see xbee_init, xbee_getc_nb
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187 | **/
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188 | int xbee_getc(void) |
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189 | { |
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190 | // Wait for the receive buffer to be filled
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191 | loop_until_bit_is_set(UCSR1A, RXC1); |
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192 | |||
193 | // Read the receive buffer
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194 | return UDR1;
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195 | } |
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196 | |||
197 | /**
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198 | * Non blocking version of usb_getc. If a character is present in the buffer,
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199 | * it is returned, otherwise -1 is returned immediately. usb_init must be
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200 | * called before this function can be used.
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201 | *
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202 | * @param c the received character. This will be set if a character has
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203 | * been received.
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204 | *
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205 | * @return -1 if no character is available, 0 otherwise
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206 | *
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207 | * @see usb_init, usb_getc
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208 | **/
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209 | int usb_getc_nb(char *c) |
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210 | { |
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211 | // check if the receive buffer is filled
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212 | if (UCSR0A & _BV(RXC0)) {
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213 | // Read the receive buffer
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214 | (*c) = UDR0; |
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215 | return 0; |
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216 | } |
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217 | else {
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218 | // Return empty
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219 | return -1; |
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220 | } |
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221 | } |
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222 | |||
223 | /**
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224 | * Non blocking version of xbee_getc. If a character is present in the buffer,
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225 | * it is returned, otherwise -1 is returned immediately. xbee_init
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226 | * must be called before this function can be used.
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227 | *
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228 | * @param c the received character. This will be set if a character has
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229 | * been received.
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230 | *
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231 | * @return -1 if no character is available, 0 otherwise
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232 | *
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233 | * @see xbee_init, xbee_getc
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234 | **/
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235 | int xbee_getc_nb(char *c) |
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236 | { |
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237 | // check if the receive buffer is filled
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238 | if (UCSR1A & _BV(RXC1)) {
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239 | // Read the receive buffer
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240 | (*c) = UDR1; |
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241 | return 0; |
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242 | } |
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243 | else {
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244 | // Return empty
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245 | return -1; |
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246 | } |
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247 | } |
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248 | |||
249 | |||
250 | /*
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251 | prints an int to serial
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252 | |||
253 | code adapted from Chris Efstathiou's code (hendrix@otenet.gr)
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254 | uses usb_putc
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255 | */
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256 | /**
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257 | * Prints an integer, converted to ASCII, to usb. usb_init must be called
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258 | * before this function can be used.
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259 | *
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260 | * @param value the integer to print
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261 | *
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262 | * @return 0 if successful, nonzero otherwise
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263 | *
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264 | * @see usb_init, usb_putc
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265 | **/
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266 | int usb_puti(int value ) { |
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267 | unsigned char usb_data[6]={'0','0','0','0','0','0' }, position=sizeof(usb_data), radix=10; |
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268 | |||
269 | /* convert int to ascii */
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270 | if(value<0) { usb_putc('-'); value=-value; } |
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271 | do { position--; *(usb_data+position)=(value%radix)+'0'; value/=radix; } while(value); |
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272 | |||
273 | |||
274 | /* start displaying the number */
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275 | for(;position<=(sizeof(usb_data)-1);position++) |
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276 | { |
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277 | |||
278 | usb_putc(usb_data[position]); |
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279 | } |
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280 | |||
281 | return 0; |
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282 | } |
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283 |