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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- G N A T . S E R I A L _ C O M M U N I C A T I O N S --
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6 -- --
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7 -- B o d y --
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8 -- --
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145
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9 -- Copyright (C) 2007-2019, AdaCore --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This is the GNU/Linux implementation of this package
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33
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34 with Ada.Streams; use Ada.Streams;
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35 with Ada; use Ada;
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36
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37 with System; use System;
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38 with System.Communication; use System.Communication;
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39 with System.CRTL; use System.CRTL;
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40
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41 with GNAT.OS_Lib; use GNAT.OS_Lib;
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42
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43 package body GNAT.Serial_Communications is
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44
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45 package OSC renames System.OS_Constants;
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46
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47 use type Interfaces.C.unsigned;
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48
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49 subtype unsigned is Interfaces.C.unsigned;
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50 subtype char is Interfaces.C.char;
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51 subtype unsigned_char is Interfaces.C.unsigned_char;
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52
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53 function fcntl (fd : int; cmd : int; value : int) return int;
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54 pragma Import (C, fcntl, "fcntl");
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55
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56 C_Data_Rate : constant array (Data_Rate) of unsigned :=
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145
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57 (B75 => OSC.B75,
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58 B110 => OSC.B110,
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59 B150 => OSC.B150,
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60 B300 => OSC.B300,
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61 B600 => OSC.B600,
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62 B1200 => OSC.B1200,
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63 B2400 => OSC.B2400,
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64 B4800 => OSC.B4800,
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65 B9600 => OSC.B9600,
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66 B19200 => OSC.B19200,
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67 B38400 => OSC.B38400,
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68 B57600 => OSC.B57600,
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69 B115200 => OSC.B115200,
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70 B230400 => OSC.B230400,
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71 B460800 => OSC.B460800,
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72 B500000 => OSC.B500000,
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73 B576000 => OSC.B576000,
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74 B921600 => OSC.B921600,
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75 B1000000 => OSC.B1000000,
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76 B1152000 => OSC.B1152000,
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77 B1500000 => OSC.B1500000,
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78 B2000000 => OSC.B2000000,
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79 B2500000 => OSC.B2500000,
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80 B3000000 => OSC.B3000000,
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81 B3500000 => OSC.B3500000,
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82 B4000000 => OSC.B4000000);
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111
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83
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84 C_Bits : constant array (Data_Bits) of unsigned :=
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85 (CS7 => OSC.CS7, CS8 => OSC.CS8);
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86
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87 C_Stop_Bits : constant array (Stop_Bits_Number) of unsigned :=
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88 (One => 0, Two => OSC.CSTOPB);
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89
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90 C_Parity : constant array (Parity_Check) of unsigned :=
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91 (None => 0,
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92 Odd => OSC.PARENB or OSC.PARODD,
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93 Even => OSC.PARENB);
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94
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95 procedure Raise_Error (Message : String; Error : Integer := Errno);
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96 pragma No_Return (Raise_Error);
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97
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98 ----------
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99 -- Name --
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100 ----------
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101
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102 function Name (Number : Positive) return Port_Name is
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103 N : constant Natural := Number - 1;
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104 N_Img : constant String := Natural'Image (N);
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105 begin
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106 return Port_Name ("/dev/ttyS" & N_Img (N_Img'First + 1 .. N_Img'Last));
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107 end Name;
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108
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109 ----------
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110 -- Open --
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111 ----------
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112
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113 procedure Open
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114 (Port : out Serial_Port;
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115 Name : Port_Name)
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116 is
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117 use OSC;
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118
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119 C_Name : constant String := String (Name) & ASCII.NUL;
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120 Res : int;
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121
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122 begin
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123 Port.H := Serial_Port_Descriptor (open
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124 (C_Name (C_Name'First)'Address, int (O_RDWR + O_NOCTTY + O_NDELAY)));
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125
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126 if Port.H = -1 then
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127 Raise_Error ("open: open failed");
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128 end if;
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129
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130 -- By default we are in blocking mode
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131
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132 Res := fcntl (int (Port.H), F_SETFL, 0);
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133
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134 if Res = -1 then
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135 Raise_Error ("open: fcntl failed");
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136 end if;
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137 end Open;
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138
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139 -----------------
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140 -- Raise_Error --
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141 -----------------
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142
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143 procedure Raise_Error (Message : String; Error : Integer := Errno) is
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144 begin
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145 raise Serial_Error with Message
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146 & (if Error /= 0
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147 then " (" & Errno_Message (Err => Error) & ')'
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148 else "");
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149 end Raise_Error;
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150
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151 ----------
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152 -- Read --
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153 ----------
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154
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155 overriding procedure Read
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156 (Port : in out Serial_Port;
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157 Buffer : out Stream_Element_Array;
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158 Last : out Stream_Element_Offset)
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159 is
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160 Len : constant size_t := Buffer'Length;
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161 Res : ssize_t;
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162
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163 begin
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164 if Port.H = -1 then
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165 Raise_Error ("read: port not opened", 0);
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166 end if;
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167
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168 Res := read (Integer (Port.H), Buffer'Address, Len);
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169
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170 if Res = -1 then
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171 Raise_Error ("read failed");
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172 end if;
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173
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174 Last := Last_Index (Buffer'First, size_t (Res));
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175 end Read;
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176
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177 ---------
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178 -- Set --
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179 ---------
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180
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181 procedure Set
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182 (Port : Serial_Port;
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183 Rate : Data_Rate := B9600;
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184 Bits : Data_Bits := CS8;
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185 Stop_Bits : Stop_Bits_Number := One;
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186 Parity : Parity_Check := None;
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187 Block : Boolean := True;
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188 Local : Boolean := True;
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189 Flow : Flow_Control := None;
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190 Timeout : Duration := 10.0)
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191 is
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192 use OSC;
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193
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194 type termios is record
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195 c_iflag : unsigned;
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196 c_oflag : unsigned;
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197 c_cflag : unsigned;
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198 c_lflag : unsigned;
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199 c_line : unsigned_char;
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200 c_cc : Interfaces.C.char_array (0 .. 31);
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201 c_ispeed : unsigned;
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202 c_ospeed : unsigned;
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203 end record;
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204 pragma Convention (C, termios);
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205
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206 function tcgetattr (fd : int; termios_p : Address) return int;
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207 pragma Import (C, tcgetattr, "tcgetattr");
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208
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209 function tcsetattr
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210 (fd : int; action : int; termios_p : Address) return int;
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211 pragma Import (C, tcsetattr, "tcsetattr");
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212
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213 function tcflush (fd : int; queue_selector : int) return int;
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214 pragma Import (C, tcflush, "tcflush");
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215
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216 Current : termios;
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217
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218 Res : int;
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219 pragma Warnings (Off, Res);
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220 -- Warnings off, since we don't always test the result
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221
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222 begin
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223 if Port.H = -1 then
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224 Raise_Error ("set: port not opened", 0);
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225 end if;
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226
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227 -- Get current port settings
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228
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229 Res := tcgetattr (int (Port.H), Current'Address);
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111
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230
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231 -- Change settings now
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232
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233 Current.c_cflag := C_Data_Rate (Rate)
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234 or C_Bits (Bits)
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235 or C_Stop_Bits (Stop_Bits)
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236 or C_Parity (Parity)
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237 or CREAD;
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238 Current.c_iflag := 0;
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239 Current.c_lflag := 0;
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240 Current.c_oflag := 0;
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241
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242 if Local then
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243 Current.c_cflag := Current.c_cflag or CLOCAL;
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244 end if;
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245
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246 case Flow is
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247 when None =>
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248 null;
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249
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250 when RTS_CTS =>
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251 Current.c_cflag := Current.c_cflag or CRTSCTS;
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252
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253 when Xon_Xoff =>
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254 Current.c_iflag := Current.c_iflag or IXON;
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255 end case;
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256
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257 Current.c_ispeed := Data_Rate_Value (Rate);
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258 Current.c_ospeed := Data_Rate_Value (Rate);
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259 Current.c_cc (VMIN) := char'Val (0);
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260 Current.c_cc (VTIME) := char'Val (Natural (Timeout * 10));
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261
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262 -- Set port settings
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263
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264 Res := tcflush (int (Port.H), TCIFLUSH);
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265 Res := tcsetattr (int (Port.H), TCSANOW, Current'Address);
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111
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266
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267 -- Block
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268
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269 Res := fcntl (int (Port.H), F_SETFL, (if Block then 0 else FNDELAY));
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270
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271 if Res = -1 then
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272 Raise_Error ("set: fcntl failed");
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273 end if;
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274 end Set;
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275
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145
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276 ------------
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277 -- To_Ada --
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278 ------------
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279
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280 procedure To_Ada (Port : out Serial_Port; Fd : Serial_Port_Descriptor) is
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281 begin
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282 Port.H := Fd;
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283 end To_Ada;
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284
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111
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285 -----------
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286 -- Write --
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287 -----------
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288
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289 overriding procedure Write
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290 (Port : in out Serial_Port;
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291 Buffer : Stream_Element_Array)
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292 is
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293 Len : constant size_t := Buffer'Length;
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294 Res : ssize_t;
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295
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296 begin
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297 if Port.H = -1 then
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298 Raise_Error ("write: port not opened", 0);
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299 end if;
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300
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301 Res := write (int (Port.H), Buffer'Address, Len);
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111
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302
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303 if Res = -1 then
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304 Raise_Error ("write failed");
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305 end if;
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306
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307 pragma Assert (size_t (Res) = Len);
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308 end Write;
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309
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310 -----------
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311 -- Close --
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312 -----------
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313
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314 procedure Close (Port : in out Serial_Port) is
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315 Res : int;
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316 pragma Unreferenced (Res);
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317
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318 begin
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319 if Port.H /= -1 then
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320 Res := close (int (Port.H));
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321 end if;
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322 end Close;
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323
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324 end GNAT.Serial_Communications;
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