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annotate src/video/fbcon/SDL_fbelo.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include <unistd.h>
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25 #include <sys/time.h>
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26 #include <ctype.h>
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27
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28 #include "SDL_stdinc.h"
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29 #include "SDL_fbvideo.h"
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30 #include "SDL_fbelo.h"
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31
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32 /*
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33 calibration default values
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34 values are read from the following environment variables:
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35
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36 SDL_ELO_MIN_X
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37 SDL_ELO_MAX_X
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38 SDL_ELO_MIN_Y
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39 SDL_ELO_MAX_Y
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40 */
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41
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42 static int ELO_MIN_X = 400;
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43 static int ELO_MAX_X = 3670;
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44 static int ELO_MIN_Y = 500;
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45 static int ELO_MAX_Y = 3540;
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46
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47 #define ELO_SNAP_SIZE 6
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48 #define ELO_TOUCH_BYTE 'T'
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49 #define ELO_ID 'I'
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50 #define ELO_MODE 'M'
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51 #define ELO_PARAMETER 'P'
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52 #define ELO_REPORT 'B'
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53 #define ELO_ACK 'A'
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54
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55 #define ELO_INIT_CHECKSUM 0xAA
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56
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57 #define ELO_BTN_PRESS 0x01
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58 #define ELO_STREAM 0x02
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59 #define ELO_BTN_RELEASE 0x04
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60
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61 #define ELO_TOUCH_MODE 0x01
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62 #define ELO_STREAM_MODE 0x02
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63 #define ELO_UNTOUCH_MODE 0x04
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64 #define ELO_RANGE_CHECK_MODE 0x40
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65 #define ELO_TRIM_MODE 0x02
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66 #define ELO_CALIB_MODE 0x04
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67 #define ELO_SCALING_MODE 0x08
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68 #define ELO_TRACKING_MODE 0x40
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69
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70 #define ELO_SERIAL_MASK 0xF8
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71
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72 #define ELO_SERIAL_IO '0'
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73
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74 #define ELO_MAX_TRIALS 3
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75 #define ELO_MAX_WAIT 100000
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76 #define ELO_UNTOUCH_DELAY 5
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77 #define ELO_REPORT_DELAY 1
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78
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79 /* eloParsePacket
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80 */
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81 int
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82 eloParsePacket(unsigned char *mousebuf, int *dx, int *dy, int *button_state)
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83 {
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84 static int elo_button = 0;
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85 static int last_x = 0;
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86 static int last_y = 0;
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87 int x, y;
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88
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89 /* Check if we have a touch packet */
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90 if (mousebuf[1] != ELO_TOUCH_BYTE) {
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91 return 0;
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92 }
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93
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94 x = ((mousebuf[4] << 8) | mousebuf[3]);
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95 y = ((mousebuf[6] << 8) | mousebuf[5]);
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96
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97 if ((SDL_abs(x - last_x) > ELO_SNAP_SIZE)
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98 || (SDL_abs(y - last_y) > ELO_SNAP_SIZE)) {
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99 *dx = ((mousebuf[4] << 8) | mousebuf[3]);
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100 *dy = ((mousebuf[6] << 8) | mousebuf[5]);
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101 } else {
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102 *dx = last_x;
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103 *dy = last_y;
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104 }
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105
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106 last_x = *dx;
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107 last_y = *dy;
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108
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109 if ((mousebuf[2] & 0x07) == ELO_BTN_PRESS) {
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110 elo_button = 1;
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111 }
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112 if ((mousebuf[2] & 0x07) == ELO_BTN_RELEASE) {
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113 elo_button = 0;
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114 }
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115
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116 *button_state = elo_button;
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117 return 1;
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118 }
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119
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120 /* Convert the raw coordinates from the ELO controller
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121 to a screen position.
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122 */
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123 void
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124 eloConvertXY(_THIS, int *dx, int *dy)
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125 {
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126 int input_x = *dx;
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127 int input_y = *dy;
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128 int width = ELO_MAX_X - ELO_MIN_X;
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129 int height = ELO_MAX_Y - ELO_MIN_Y;
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130
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131 *dx =
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132 ((int) cache_vinfo.xres -
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133 ((int) cache_vinfo.xres * (input_x - ELO_MIN_X)) / width);
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134 *dy = (cache_vinfo.yres * (input_y - ELO_MIN_Y)) / height;
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135 }
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136
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137
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138 /* eloGetPacket
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139 */
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140 int
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141 eloGetPacket(unsigned char *buffer, int *buffer_p, int *checksum, int fd)
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142 {
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143 int num_bytes;
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144 int ok;
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145
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146 if (fd == 0) {
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147 num_bytes = ELO_PACKET_SIZE;
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148 } else {
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149 num_bytes = read(fd,
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150 (char *) (buffer + *buffer_p),
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151 ELO_PACKET_SIZE - *buffer_p);
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152 }
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153
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154 if (num_bytes < 0) {
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155 #ifdef DEBUG_MOUSE
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156 fprintf(stderr,
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157 "System error while reading from Elographics touchscreen.\n");
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158 #endif
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159 return 0;
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160 }
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161
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162 while (num_bytes) {
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163 if ((*buffer_p == 0) && (buffer[0] != ELO_START_BYTE)) {
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164 SDL_memcpy(&buffer[0], &buffer[1], num_bytes - 1);
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165 } else {
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166 if (*buffer_p < ELO_PACKET_SIZE - 1) {
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167 *checksum = *checksum + buffer[*buffer_p];
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168 *checksum = *checksum % 256;
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169 }
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170 (*buffer_p)++;
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171 }
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172 num_bytes--;
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173 }
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174
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175 if (*buffer_p == ELO_PACKET_SIZE) {
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176 ok = (*checksum == buffer[ELO_PACKET_SIZE - 1]);
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177 *checksum = ELO_INIT_CHECKSUM;
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178 *buffer_p = 0;
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179
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180 if (!ok) {
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181 return 0;
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182 }
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183
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184 return 1;
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185 } else {
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186 return 0;
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187 }
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188 }
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189
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190 /* eloSendPacket
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191 */
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192
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193 int
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194 eloSendPacket(unsigned char *packet, int fd)
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195 {
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196 int i, result;
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197 int sum = ELO_INIT_CHECKSUM;
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198
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199 packet[0] = ELO_START_BYTE;
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200 for (i = 0; i < ELO_PACKET_SIZE - 1; i++) {
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201 sum += packet[i];
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202 sum &= 0xFF;
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203 }
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204 packet[ELO_PACKET_SIZE - 1] = sum;
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205
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206 result = write(fd, packet, ELO_PACKET_SIZE);
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207
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208 if (result != ELO_PACKET_SIZE) {
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209 #ifdef DEBUG_MOUSE
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210 printf("System error while sending to Elographics touchscreen.\n");
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211 #endif
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212 return 0;
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213 } else {
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214 return 1;
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215 }
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216 }
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217
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218
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219 /* eloWaitForInput
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220 */
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221 int
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222 eloWaitForInput(int fd, int timeout)
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223 {
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224 fd_set readfds;
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225 struct timeval to;
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226 int r;
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227
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228 FD_ZERO(&readfds);
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229 FD_SET(fd, &readfds);
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230 to.tv_sec = 0;
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231 to.tv_usec = timeout;
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232
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233 r = select(FD_SETSIZE, &readfds, NULL, NULL, &to);
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234 return r;
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235 }
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236
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237 /* eloWaitReply
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238 */
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239 int
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240 eloWaitReply(unsigned char type, unsigned char *reply, int fd)
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241 {
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242 int ok;
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243 int i, result;
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244 int reply_p = 0;
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245 int sum = ELO_INIT_CHECKSUM;
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246
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247 i = ELO_MAX_TRIALS;
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248 do {
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249 ok = 0;
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250
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251 result = eloWaitForInput(fd, ELO_MAX_WAIT);
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252
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253 if (result > 0) {
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254 ok = eloGetPacket(reply, &reply_p, &sum, fd);
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255
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256 if (ok && reply[1] != type && type != ELO_PARAMETER) {
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257 #ifdef DEBUG_MOUSE
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258 fprintf(stderr, "Wrong reply received\n");
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259 #endif
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260 ok = 0;
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261 }
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262 } else {
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263 #ifdef DEBUG_MOUSE
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264 fprintf(stderr, "No input!\n");
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265 #endif
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266 }
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267
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268 if (result == 0) {
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269 i--;
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270 }
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271 }
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272 while (!ok && (i > 0));
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273
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274 return ok;
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275 }
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276
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277
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278 /* eloWaitAck
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279 */
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280
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281 int
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282 eloWaitAck(int fd)
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283 {
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284 unsigned char packet[ELO_PACKET_SIZE];
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285 int i, nb_errors;
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286
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287 if (eloWaitReply(ELO_ACK, packet, fd)) {
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288 for (i = 0, nb_errors = 0; i < 4; i++) {
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289 if (packet[2 + i] != '0') {
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290 nb_errors++;
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291 }
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292 }
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293
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294 if (nb_errors != 0) {
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295 #ifdef DEBUG_MOUSE
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296 fprintf(stderr,
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297 "Elographics acknowledge packet reports %d errors\n",
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298 nb_errors);
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299 #endif
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300 }
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301 return 1;
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302 } else {
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303 return 0;
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304 }
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305 }
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306
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307
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308 /* eloSendQuery --
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309 */
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310 int
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311 eloSendQuery(unsigned char *request, unsigned char *reply, int fd)
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312 {
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313 int ok;
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314
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315 if (eloSendPacket(request, fd)) {
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316 ok = eloWaitReply(toupper(request[1]), reply, fd);
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317 if (ok) {
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318 ok = eloWaitAck(fd);
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319 }
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320 return ok;
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321 } else {
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322 return 0;
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323 }
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324 }
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325
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326
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327 /* eloSendControl
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328 */
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329 int
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330 eloSendControl(unsigned char *control, int fd)
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331 {
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332 if (eloSendPacket(control, fd)) {
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333 return eloWaitAck(fd);
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334 } else {
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335 return 0;
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336 }
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337 }
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338
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339 /* eloInitController
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340 */
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341 int
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342 eloInitController(int fd)
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343 {
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344 unsigned char req[ELO_PACKET_SIZE];
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345 unsigned char reply[ELO_PACKET_SIZE];
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346 const char *buffer = NULL;
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347 int result = 0;
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348
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349 struct termios mouse_termios;
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350
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351 /* try to read the calibration values */
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352 buffer = SDL_getenv("SDL_ELO_MIN_X");
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353 if (buffer) {
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354 ELO_MIN_X = SDL_atoi(buffer);
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355 }
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356 buffer = SDL_getenv("SDL_ELO_MAX_X");
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357 if (buffer) {
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358 ELO_MAX_X = SDL_atoi(buffer);
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359 }
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360 buffer = SDL_getenv("SDL_ELO_MIN_Y");
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361 if (buffer) {
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362 ELO_MIN_Y = SDL_atoi(buffer);
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363 }
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364 buffer = SDL_getenv("SDL_ELO_MAX_Y");
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365 if (buffer) {
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366 ELO_MAX_Y = SDL_atoi(buffer);
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367 }
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368 #ifdef DEBUG_MOUSE
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369 fprintf(stderr,
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370 "ELO calibration values:\nmin_x: %i\nmax_x: %i\nmin_y: %i\nmax_y: %i\n",
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371 ELO_MIN_X, ELO_MAX_X, ELO_MIN_Y, ELO_MAX_Y);
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372 #endif
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373
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374 /* set comm params */
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375 SDL_memset(&mouse_termios, 0, sizeof(mouse_termios));
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376 mouse_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL;
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377 mouse_termios.c_cc[VMIN] = 1;
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378 result = tcsetattr(fd, TCSANOW, &mouse_termios);
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379
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380 if (result < 0) {
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381 #ifdef DEBUG_MOUSE
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382 fprintf(stderr, "Unable to configure Elographics touchscreen port\n");
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383 #endif
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384 return 0;
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385 }
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386
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387 SDL_memset(req, 0, ELO_PACKET_SIZE);
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388 req[1] = tolower(ELO_PARAMETER);
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389 if (!eloSendQuery(req, reply, fd)) {
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390 #ifdef DEBUG_MOUSE
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391 fprintf(stderr,
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392 "Not at the specified rate or model 2310, will continue\n");
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393 #endif
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394 }
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395
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396 SDL_memset(req, 0, ELO_PACKET_SIZE);
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397 req[1] = tolower(ELO_ID);
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398 if (eloSendQuery(req, reply, fd)) {
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399 #ifdef DEBUG_MOUSE
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400 fprintf(stderr, "Ok, controller configured!\n");
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401 #endif
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402 } else {
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403 #ifdef DEBUG_MOUSE
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404 fprintf(stderr,
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405 "Unable to ask Elographics touchscreen identification\n");
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406 #endif
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407 return 0;
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408 }
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409
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410 SDL_memset(req, 0, ELO_PACKET_SIZE);
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411 req[1] = ELO_MODE;
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412 req[3] = ELO_TOUCH_MODE | ELO_STREAM_MODE | ELO_UNTOUCH_MODE;
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413 req[4] = ELO_TRACKING_MODE;
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414 if (!eloSendControl(req, fd)) {
0
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parents:
diff changeset
415 #ifdef DEBUG_MOUSE
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416 fprintf(stderr,
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417 "Unable to change Elographics touchscreen operating mode\n");
0
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parents:
diff changeset
418 #endif
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419 return 0;
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420 }
0
74212992fb08 Initial revision
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parents:
diff changeset
421
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422 SDL_memset(req, 0, ELO_PACKET_SIZE);
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423 req[1] = ELO_REPORT;
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424 req[2] = ELO_UNTOUCH_DELAY;
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425 req[3] = ELO_REPORT_DELAY;
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426 if (!eloSendControl(req, fd)) {
0
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parents:
diff changeset
427 #ifdef DEBUG_MOUSE
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diff changeset
428 fprintf(stderr,
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diff changeset
429 "Unable to change Elographics touchscreen reports timings\n");
0
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parents:
diff changeset
430 #endif
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431 return 0;
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parents: 1402
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432 }
0
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parents:
diff changeset
433
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434 return 1;
0
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parents:
diff changeset
435 }
4
4f6c5f021323 Date: Thu, 26 Apr 2001 10:46:23 +0200
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
436
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diff changeset
437 int
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diff changeset
438 eloReadPosition(_THIS, int fd, int *x, int *y, int *button_state, int *realx,
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parents: 1662
diff changeset
439 int *realy)
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diff changeset
440 {
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diff changeset
441 unsigned char buffer[ELO_PACKET_SIZE];
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diff changeset
442 int pointer = 0;
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parents: 1402
diff changeset
443 int checksum = ELO_INIT_CHECKSUM;
4
4f6c5f021323 Date: Thu, 26 Apr 2001 10:46:23 +0200
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
444
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diff changeset
445 while (pointer < ELO_PACKET_SIZE) {
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diff changeset
446 if (eloGetPacket(buffer, &pointer, &checksum, fd)) {
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diff changeset
447 break;
4
4f6c5f021323 Date: Thu, 26 Apr 2001 10:46:23 +0200
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parents: 0
diff changeset
448 }
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parents: 1402
diff changeset
449 }
4
4f6c5f021323 Date: Thu, 26 Apr 2001 10:46:23 +0200
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parents: 0
diff changeset
450
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diff changeset
451 if (!eloParsePacket(buffer, realx, realy, button_state)) {
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parents: 1402
diff changeset
452 return 0;
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parents: 1402
diff changeset
453 }
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diff changeset
454
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parents: 1402
diff changeset
455 *x = *realx;
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parents: 1402
diff changeset
456 *y = *realy;
4
4f6c5f021323 Date: Thu, 26 Apr 2001 10:46:23 +0200
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parents: 0
diff changeset
457
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458 eloConvertXY(this, x, y);
4
4f6c5f021323 Date: Thu, 26 Apr 2001 10:46:23 +0200
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parents: 0
diff changeset
459
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diff changeset
460 return 1;
4
4f6c5f021323 Date: Thu, 26 Apr 2001 10:46:23 +0200
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parents: 0
diff changeset
461 }
1662
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parents: 1402
diff changeset
462
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
463 /* vi: set ts=4 sw=4 expandtab: */