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annotate packages/io/serial/current/include/serial.h @ 86:6512add4f5d6 ecos-sw-2000-05-05

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Merge from eCos master repository on 2000-05-05-07:47:05-BST
author jlarmour
date Fri, 05 May 2000 17:31:08 +0000
parents bf00f99aec69
children 6ed91473a1cd
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1 #ifndef CYGONCE_SERIAL_H
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2 #define CYGONCE_SERIAL_H
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3 // ====================================================================
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4 //
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5 // serial.h
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6 //
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7 // Device I/O
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8 //
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9 // ====================================================================
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10 //####COPYRIGHTBEGIN####
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11 //
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12 // -------------------------------------------
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13 // The contents of this file are subject to the Red Hat eCos Public License
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14 // Version 1.1 (the "License"); you may not use this file except in
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15 // compliance with the License. You may obtain a copy of the License at
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16 // http://www.redhat.com/
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17 //
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18 // Software distributed under the License is distributed on an "AS IS"
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19 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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20 // License for the specific language governing rights and limitations under
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21 // the License.
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22 //
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23 // The Original Code is eCos - Embedded Configurable Operating System,
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24 // released September 30, 1998.
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25 //
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26 // The Initial Developer of the Original Code is Red Hat.
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27 // Portions created by Red Hat are
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28 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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29 // All Rights Reserved.
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30 // -------------------------------------------
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31 //
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32 //####COPYRIGHTEND####
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33 // ====================================================================
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34 //#####DESCRIPTIONBEGIN####
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35 //
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36 // Author(s): gthomas
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37 // Contributors: gthomas
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38 // Date: 1999-02-04
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39 // Purpose: Internal interfaces for serial I/O drivers
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40 // Description:
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 // ====================================================================
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45
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46 // Serial I/O interfaces
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47
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48 #include <pkgconf/system.h>
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49 #include <pkgconf/io_serial.h>
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50
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51 #include <cyg/infra/cyg_type.h>
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52 #include <cyg/io/io.h>
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53 #include <cyg/io/serialio.h>
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54 #include <cyg/hal/drv_api.h>
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55
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56 typedef struct serial_channel serial_channel;
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57 typedef struct serial_funs serial_funs;
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58
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59 // Pointers into upper-level driver which interrupt handlers need
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60 typedef struct {
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61 // Initialize the channel
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62 void (*serial_init)(serial_channel *chan);
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63 // Cause an additional character to be output if one is available
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64 void (*xmt_char)(serial_channel *chan);
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65 // Consume an input character
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66 void (*rcv_char)(serial_channel *chan, unsigned char c);
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67
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68 #ifdef CYGINT_IO_SERIAL_BLOCK_TRANSFER
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69 // Request space for input characters
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70 bool (*data_rcv_req)(serial_channel *chan, int avail,
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71 int* space_avail, unsigned char** space);
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72 // Receive operation completed
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73 void (*data_rcv_done)(serial_channel *chan);
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74 // Request characters for transmission
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75 bool (*data_xmt_req)(serial_channel *chan, int space,
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76 int* chars_avail, unsigned char** chars);
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77 // Transmit operation completed
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78 void (*data_xmt_done)(serial_channel *chan);
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79 #endif // CYGINT_IO_SERIAL_BLOCK_TRANSFER
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80 } serial_callbacks_t;
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81
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82 #ifdef CYGINT_IO_SERIAL_BLOCK_TRANSFER
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83 #define SERIAL_CALLBACKS(_l,_init,_xmt_char,_rcv_char, _data_rcv_req, _data_rcv_done, _data_xmt_req, _data_xmt_done) \
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84 serial_callbacks_t _l = { \
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85 _init, \
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86 _xmt_char, \
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87 _rcv_char, \
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88 _data_rcv_req, \
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89 _data_rcv_done, \
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90 _data_xmt_req, \
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91 _data_xmt_done \
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92 };
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93 #else
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94 #define SERIAL_CALLBACKS(_l,_init,_xmt_char,_rcv_char) \
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95 serial_callbacks_t _l = { \
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96 _init, \
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97 _xmt_char, \
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98 _rcv_char \
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99 };
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100 #endif
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101
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102 extern serial_callbacks_t cyg_io_serial_callbacks;
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103
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104 typedef struct {
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105 unsigned char *data;
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106 volatile int put;
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107 volatile int get;
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108 int len;
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109 int low_water; // Min space in buffer before restart
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110 cyg_drv_cond_t wait;
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111 cyg_drv_mutex_t lock;
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112 bool waiting;
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113 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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114 bool blocking;
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115 #endif
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116 volatile bool abort; // Set by an outsider to kill processing
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117 volatile cyg_int32 pending; // This many bytes waiting to be sent
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118 } cbuf_t;
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119
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120 #define CBUF_INIT(_data, _len) \
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121 {_data, 0, 0, _len}
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122
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123 // Private data which describes this channel
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124 struct serial_channel {
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125 serial_funs *funs;
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126 serial_callbacks_t *callbacks;
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127 void *dev_priv; // Whatever is needed by actual device routines
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128 cyg_serial_info_t config; // Current configuration
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129 bool init;
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130 cbuf_t out_cbuf;
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131 cbuf_t in_cbuf;
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132 };
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133
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134 // Initialization macro for serial channel
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135 #define SERIAL_CHANNEL(_l, \
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136 _funs, \
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137 _dev_priv, \
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138 _baud, _stop, _parity, _word_length, _flags) \
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139 serial_channel _l = { \
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140 &_funs, \
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141 &cyg_io_serial_callbacks, \
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142 &(_dev_priv), \
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143 CYG_SERIAL_INFO_INIT(_baud, _stop, _parity, _word_length, _flags), \
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144 };
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145
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146 #define SERIAL_CHANNEL_USING_INTERRUPTS(_l, \
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147 _funs, \
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148 _dev_priv, \
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149 _baud, _stop, _parity, _word_length, _flags, \
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150 _out_buf, _out_buflen, \
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151 _in_buf, _in_buflen) \
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152 serial_channel _l = { \
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153 &_funs, \
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154 &cyg_io_serial_callbacks, \
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155 &(_dev_priv), \
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156 CYG_SERIAL_INFO_INIT(_baud, _stop, _parity, _word_length, _flags), \
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157 false, \
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158 CBUF_INIT(_out_buf, _out_buflen), \
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159 CBUF_INIT(_in_buf, _in_buflen) \
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160 };
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161
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162 // Low level interface functions
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163 struct serial_funs {
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164 // Send one character to the output device, return true if consumed
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165 bool (*putc)(serial_channel *priv, unsigned char c);
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166 // Fetch one character from the device
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167 unsigned char (*getc)(serial_channel *priv);
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168 // Change hardware configuration (baud rate, etc)
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169 bool (*set_config)(serial_channel *priv, cyg_serial_info_t *config);
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170 // Enable the transmit channel and turn on transmit interrupts
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171 void (*start_xmit)(serial_channel *priv);
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172 // Disable the transmit channel and turn transmit interrupts off
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173 void (*stop_xmit)(serial_channel *priv);
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174 };
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175
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176 #define SERIAL_FUNS(_l,_putc,_getc,_set_config,_start_xmit,_stop_xmit) \
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177 serial_funs _l = { \
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178 _putc, \
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179 _getc, \
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180 _set_config, \
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181 _start_xmit, \
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182 _stop_xmit \
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183 };
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184
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185 extern cyg_devio_table_t cyg_io_serial_devio;
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186
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187 #endif // CYGONCE_SERIAL_H