1 | /*===============================================================*\ |
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2 | | File: serdbgio.c | |
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3 | +-----------------------------------------------------------------+ |
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4 | | Copyright (c) 2002 IMD | |
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5 | | Ingenieurbuero fuer Microcomputertechnik Th. Doerfler | |
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6 | | Hebststr. 8, 82178 Puchheim, Germany | |
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7 | | <Thomas.Doerfler@imd-systems.de> | |
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8 | | The license and distribution terms for this file may be | |
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9 | | found in the file LICENSE in this distribution or at | |
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10 | | http://www.rtems.com/license/LICENSE. | |
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11 | | all rights reserved | |
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12 | +-----------------------------------------------------------------+ |
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13 | | TERMIOS serial gdb interface support | |
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14 | | the functions in this file allow the standard gdb stubs like | |
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15 | | "m68k-stub.c" to access any serial interfaces that work with | |
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16 | | RTEMS termios in polled mode | |
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17 | | | |
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18 | +-----------------------------------------------------------------+ |
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19 | | date history ID | |
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20 | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
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21 | | 10.05.02 creation doe | |
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22 | |*****************************************************************| |
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23 | |* $Id$ |
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24 | * |
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25 | |*****************************************************************| |
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26 | \*===============================================================*/ |
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27 | |
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28 | #ifdef HAVE_CONFIG_H |
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29 | #include "config.h" |
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30 | #endif |
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31 | |
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32 | #include <rtems.h> |
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33 | #include <rtems/libio_.h> |
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34 | #include <errno.h> |
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35 | #include <unistd.h> /* close */ |
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36 | #include <stdio.h> |
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37 | #include <fcntl.h> |
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38 | #include <termios.h> |
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39 | |
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40 | #include <rtems/termiostypes.h> |
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41 | #include <rtems/serdbg.h> |
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42 | |
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43 | |
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44 | /* |
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45 | * internal variables |
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46 | */ |
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47 | int serdbg_fd = -1; |
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48 | struct rtems_termios_tty *serdbg_tty; |
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49 | |
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50 | /*=========================================================================*\ |
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51 | | Function: | |
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52 | \*-------------------------------------------------------------------------*/ |
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53 | int serdbg_open |
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54 | |
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55 | /*-------------------------------------------------------------------------*\ |
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56 | | Purpose: | |
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57 | | try to open given serial debug port | |
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58 | +---------------------------------------------------------------------------+ |
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59 | | Input Parameters: | |
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60 | \*-------------------------------------------------------------------------*/ |
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61 | ( |
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62 | const char *dev_name, /* name of device to open */ |
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63 | uint32_t baudrate /* baud rate to use */ |
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64 | ) |
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65 | /*-------------------------------------------------------------------------*\ |
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66 | | Return Value: | |
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67 | | 0 on success, -1 and errno otherwise | |
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68 | \*=========================================================================*/ |
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69 | { |
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70 | boolean err_occurred = FALSE; |
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71 | rtems_libio_t *iop = NULL; |
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72 | struct termios act_termios; |
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73 | tcflag_t baudcode = B0; |
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74 | |
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75 | #define FD_STORE_CNT 3 |
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76 | int fd_store[FD_STORE_CNT]; |
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77 | int fd_store_used = 0; |
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78 | |
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79 | /* |
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80 | * translate baudrate into baud code |
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81 | */ |
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82 | switch(baudrate) { |
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83 | case 50: baudcode = B50; break; |
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84 | case 75: baudcode = B75; break; |
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85 | case 110: baudcode = B110; break; |
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86 | case 134: baudcode = B134; break; |
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87 | case 150: baudcode = B150; break; |
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88 | case 200: baudcode = B200; break; |
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89 | case 300: baudcode = B300; break; |
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90 | case 600: baudcode = B600; break; |
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91 | case 1200: baudcode = B1200; break; |
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92 | case 1800: baudcode = B1800; break; |
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93 | case 2400: baudcode = B2400; break; |
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94 | case 4800: baudcode = B4800; break; |
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95 | case 9600: baudcode = B9600; break; |
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96 | case 19200: baudcode = B19200; break; |
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97 | case 38400: baudcode = B38400; break; |
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98 | case 57600: baudcode = B57600; break; |
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99 | case 115200: baudcode = B115200; break; |
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100 | case 230400: baudcode = B230400; break; |
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101 | case 460800: baudcode = B460800; break; |
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102 | default : err_occurred = TRUE; errno = EINVAL; break; |
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103 | } |
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104 | |
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105 | /* |
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106 | * open device for serdbg operation |
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107 | * skip any fds that are between 0..2, because they are |
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108 | * reserved for stdin/out/err |
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109 | */ |
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110 | if (!err_occurred && |
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111 | (dev_name != NULL) && |
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112 | (dev_name[0] != '\0')) { |
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113 | do { |
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114 | serdbg_fd = open(dev_name,O_RDWR); |
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115 | if (serdbg_fd < 0) { |
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116 | err_occurred = TRUE; |
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117 | } |
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118 | else { |
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119 | if (serdbg_fd < 3) { |
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120 | if (fd_store_used >= FD_STORE_CNT) { |
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121 | err_occurred = TRUE; |
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122 | } |
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123 | else { |
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124 | fd_store[fd_store_used++] = serdbg_fd; |
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125 | } |
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126 | } |
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127 | } |
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128 | } while (!err_occurred && |
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129 | (serdbg_fd < 3)); |
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130 | } |
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131 | /* |
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132 | * close any fds, that have been placed in fd_store |
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133 | * so fd 0..2 are reusable again |
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134 | */ |
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135 | while (--fd_store_used >= 0) { |
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136 | close(fd_store[fd_store_used]); |
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137 | } |
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138 | |
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139 | /* |
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140 | * capture tty structure |
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141 | */ |
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142 | if (!err_occurred) { |
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143 | iop = &rtems_libio_iops[serdbg_fd]; |
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144 | serdbg_tty = iop->data1; |
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145 | } |
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146 | /* |
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147 | * set device baudrate |
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148 | * (and transp mode, this is not really needed) |
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149 | * ... |
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150 | */ |
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151 | /* |
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152 | * ... get fd settings |
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153 | */ |
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154 | if (!err_occurred && |
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155 | (0 != tcgetattr(serdbg_fd,&act_termios))) { |
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156 | err_occurred = TRUE; |
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157 | } |
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158 | if (!err_occurred) { |
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159 | act_termios.c_iflag |
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160 | &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP |
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161 | |INLCR|IGNCR|ICRNL|IXON); |
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162 | act_termios.c_oflag |
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163 | &= ~OPOST; |
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164 | |
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165 | act_termios.c_lflag |
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166 | &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); |
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167 | |
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168 | cfsetospeed(&act_termios,baudcode); |
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169 | cfsetispeed(&act_termios,baudcode); |
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170 | |
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171 | if (0 != tcsetattr(serdbg_fd,TCSANOW,&act_termios)) { |
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172 | err_occurred = TRUE; |
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173 | } |
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174 | } |
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175 | return (err_occurred |
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176 | ? -1 |
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177 | : 0); |
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178 | } |
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179 | |
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180 | void putDebugChar(char c) __attribute__ ((__weak__)); |
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181 | /*=========================================================================*\ |
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182 | | Function: | |
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183 | \*-------------------------------------------------------------------------*/ |
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184 | void putDebugChar |
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185 | /*-------------------------------------------------------------------------*\ |
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186 | | Purpose: | |
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187 | | send one character to serial port | |
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188 | +---------------------------------------------------------------------------+ |
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189 | | Input Parameters: | |
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190 | \*-------------------------------------------------------------------------*/ |
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191 | ( |
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192 | char c /* character to print */ |
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193 | ) |
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194 | /*-------------------------------------------------------------------------*\ |
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195 | | Return Value: | |
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196 | | <none> | |
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197 | \*=========================================================================*/ |
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198 | { |
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199 | /* |
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200 | * call serdbg polling callout, if available |
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201 | */ |
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202 | if (serdbg_conf.callout != NULL) { |
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203 | serdbg_conf.callout(); |
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204 | } |
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205 | /* |
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206 | * check, whether debug serial port is available |
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207 | */ |
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208 | if ((serdbg_tty != NULL) && |
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209 | (serdbg_tty->device.write != NULL)) { |
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210 | /* |
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211 | * send character to debug serial port |
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212 | */ |
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213 | serdbg_tty->device.write(serdbg_tty->minor,&c,1); |
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214 | } |
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215 | } |
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216 | |
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217 | int getDebugChar(void) __attribute__ ((__weak__)); |
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218 | /*=========================================================================*\ |
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219 | | Function: | |
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220 | \*-------------------------------------------------------------------------*/ |
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221 | int getDebugChar |
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222 | /*-------------------------------------------------------------------------*\ |
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223 | | Purpose: | |
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224 | | wait for one character from serial port | |
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225 | +---------------------------------------------------------------------------+ |
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226 | | Input Parameters: | |
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227 | \*-------------------------------------------------------------------------*/ |
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228 | ( |
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229 | void /* none */ |
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230 | ) |
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231 | /*-------------------------------------------------------------------------*\ |
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232 | | Return Value: | |
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233 | | received character | |
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234 | \*=========================================================================*/ |
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235 | { |
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236 | int c = -1; |
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237 | /* |
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238 | * check, whether debug serial port is available |
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239 | */ |
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240 | if ((serdbg_tty != NULL) && |
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241 | (serdbg_tty->device.pollRead != NULL)) { |
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242 | do { |
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243 | /* |
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244 | * call serdbg polling callout, if available |
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245 | */ |
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246 | if (serdbg_conf.callout != NULL) { |
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247 | serdbg_conf.callout(); |
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248 | } |
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249 | /* |
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250 | * get character from debug serial port |
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251 | */ |
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252 | c = serdbg_tty->device.pollRead(serdbg_tty->minor); |
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253 | } while (c < 0); |
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254 | } |
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255 | return c; |
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256 | } |
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