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annotate packages/devs/touch/arm/aaed2000/current/src/aaed2000_ts.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // aaed2000_ts.c
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4 //
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5 // Touchscreen driver for the Agilent aaed2000
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6 //
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7 //==========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas
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44 // Contributors: gthomas
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45 // Date: 2002-03-05
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46 // Purpose:
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47 // Description: Touchscreen driver for Agilent AAED2000
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //==========================================================================
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52
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53
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54 #include <pkgconf/devs_touch_aaed2000.h>
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55
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56 #include <cyg/kernel/kapi.h>
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57 #include <cyg/hal/hal_io.h>
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58 #include <cyg/hal/hal_arch.h>
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59 #include <cyg/hal/drv_api.h>
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60 #include <cyg/hal/hal_intr.h>
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61 #include <cyg/hal/aaed2000.h>
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62 #include <cyg/infra/cyg_type.h>
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63 #include <cyg/infra/cyg_ass.h>
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64 #include <cyg/infra/diag.h>
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65
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66 #include <cyg/fileio/fileio.h> // For select() functionality
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67 static cyg_selinfo ts_select_info;
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68 static cyg_bool ts_select_active;
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69
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70 #include <cyg/io/devtab.h>
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71
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72 /* ADS7846 flags */
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73 #define ADS_START (1 << 7)
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74 #define ADS_MEASURE_Y (0x01 << 4)
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75 #define ADS_MEASURE_X (0x05 << 4)
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76 #define ADS_MODE_12_BIT 0
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77 #define ADS_PD0 0
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78
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79 // Misc constants
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80 #define TS_INT (1<<0)
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81 #define X_THRESHOLD 0x80
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82 #define Y_THRESHOLD 0x80
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83
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84 // Functions in this module
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85
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86 static Cyg_ErrNo ts_read(cyg_io_handle_t handle,
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87 void *buffer,
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88 cyg_uint32 *len);
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89 static cyg_bool ts_select(cyg_io_handle_t handle,
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90 cyg_uint32 which,
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91 cyg_addrword_t info);
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92 static Cyg_ErrNo ts_set_config(cyg_io_handle_t handle,
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93 cyg_uint32 key,
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94 const void *buffer,
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95 cyg_uint32 *len);
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96 static Cyg_ErrNo ts_get_config(cyg_io_handle_t handle,
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97 cyg_uint32 key,
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98 void *buffer,
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99 cyg_uint32 *len);
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100 static bool ts_init(struct cyg_devtab_entry *tab);
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101 static Cyg_ErrNo ts_lookup(struct cyg_devtab_entry **tab,
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102 struct cyg_devtab_entry *st,
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103 const char *name);
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104
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105 CHAR_DEVIO_TABLE(aaed2000_ts_handlers,
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106 NULL, // Unsupported write() function
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107 ts_read,
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108 ts_select,
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109 ts_get_config,
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110 ts_set_config);
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111
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112 CHAR_DEVTAB_ENTRY(aaed2000_ts_device,
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113 CYGDAT_DEVS_TOUCH_AAED2000_NAME,
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114 NULL, // Base device name
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115 &aaed2000_ts_handlers,
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116 ts_init,
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117 ts_lookup,
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118 NULL); // Private data pointer
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119
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120 struct _event {
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121 short button_state;
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122 short xPos, yPos;
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123 short _unused;
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124 };
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125 #define MAX_EVENTS CYGNUM_DEVS_TOUCH_AAED2000_EVENT_BUFFER_SIZE
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126 static int num_events;
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127 static int _event_put, _event_get;
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128 static struct _event _events[MAX_EVENTS];
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129
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130 static bool _is_open = false;
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131 #ifdef DEBUG_RAW_EVENTS
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132 static unsigned char _ts_buf[512];
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133 static int _ts_buf_ptr = 0;
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134 #endif
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135
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136 #define STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
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137 static char ts_scan_stack[STACK_SIZE];
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138 static cyg_thread ts_scan_thread_data;
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139 static cyg_handle_t ts_scan_thread_handle;
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140 #define SCAN_FREQ 20 // Hz
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141 //#define SCAN_FREQ 5 // Hz
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142 #define SCAN_DELAY ((1000/SCAN_FREQ)/10)
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143
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144
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145 typedef struct {
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146 short min;
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147 short max;
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148 short span;
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149 } bounds;
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150
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151 static bounds xBounds = {1024, 0, 1024};
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152 static bounds yBounds = {1024, 0, 1024};
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153
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154 static Cyg_ErrNo
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155 ts_read(cyg_io_handle_t handle,
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156 void *buffer,
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157 cyg_uint32 *len)
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158 {
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159 struct _event *ev;
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160 int tot = *len;
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161 unsigned char *bp = (unsigned char *)buffer;
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162
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163 cyg_scheduler_lock(); // Prevent interaction with DSR code
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164 while (tot >= sizeof(struct _event)) {
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165 if (num_events > 0) {
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166 ev = &_events[_event_get++];
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167 if (_event_get == MAX_EVENTS) {
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168 _event_get = 0;
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169 }
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170 // Self calibrate
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171 if (ev->xPos > xBounds.max) xBounds.max = ev->xPos;
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172 if (ev->xPos < xBounds.min) xBounds.min = ev->xPos;
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173 if (ev->yPos > yBounds.max) yBounds.max = ev->yPos;
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174 if (ev->yPos < yBounds.min) yBounds.min = ev->yPos;
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175 if ((xBounds.span = xBounds.max - xBounds.min) <= 1) {
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176 xBounds.span = 1;
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177 }
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178 if ((yBounds.span = yBounds.max - yBounds.min) <= 1) {
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179 yBounds.span = 1;
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180 }
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181 // Scale values - done here so these potentially lengthy
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182 // operations take place outside of interrupt processing
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183 #ifdef DEBUG
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184 diag_printf("Raw[%d,%d], X[%d,%d,%d], Y[%d,%d,%d]",
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185 ev->xPos, ev->yPos,
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186 xBounds.max, xBounds.min, xBounds.span,
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187 yBounds.max, yBounds.min, yBounds.span);
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188 #endif
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189 ev->xPos = 640 - (((xBounds.max - ev->xPos) * 640) / xBounds.span);
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190 ev->yPos = 480 - (((yBounds.max - ev->yPos) * 480) / yBounds.span);
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191 #ifdef DEBUG
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192 diag_printf(", Cooked[%d,%d]\n",
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193 ev->xPos, ev->yPos);
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194 #endif
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195 memcpy(bp, ev, sizeof(*ev));
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196 bp += sizeof(*ev);
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197 tot -= sizeof(*ev);
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198 num_events--;
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199 } else {
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200 break; // No more events
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201 }
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202 }
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203 cyg_scheduler_unlock(); // Allow DSRs again
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204 *len -= tot;
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205 return ENOERR;
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206 }
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207
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208 static cyg_bool
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209 ts_select(cyg_io_handle_t handle,
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210 cyg_uint32 which,
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211 cyg_addrword_t info)
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212 {
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213 if (which == CYG_FREAD) {
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214 cyg_scheduler_lock(); // Prevent interaction with DSR code
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215 if (num_events > 0) {
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216 cyg_scheduler_unlock(); // Reallow interaction with DSR code
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217 return true;
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218 }
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219 if (!ts_select_active) {
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220 ts_select_active = true;
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221 cyg_selrecord(info, &ts_select_info);
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222 }
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223 cyg_scheduler_unlock(); // Reallow interaction with DSR code
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224 }
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225 return false;
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226 }
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227
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228 static Cyg_ErrNo
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229 ts_set_config(cyg_io_handle_t handle,
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230 cyg_uint32 key,
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231 const void *buffer,
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232 cyg_uint32 *len)
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233 {
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234 return EINVAL;
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235 }
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236
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237 static Cyg_ErrNo
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238 ts_get_config(cyg_io_handle_t handle,
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239 cyg_uint32 key,
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240 void *buffer,
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241 cyg_uint32 *len)
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242 {
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243 return EINVAL;
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244 }
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245
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246 static bool
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247 ts_init(struct cyg_devtab_entry *tab)
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248 {
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249 cyg_uint32 _dummy;
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250
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251 // Initialize SSP interface
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252 #if 0
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253 while (*(volatile cyg_uint32 *)AAEC_SSP_SR & AAEC_SSP_SR_RNE) {
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254 _dummy = *(volatile cyg_uint32 *)AAEC_SSP_DR; // Drain FIFO
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255 }
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256 #endif
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257 *(volatile cyg_uint32 *)AAEC_SSP_CR0 =
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258 (1 << AAEC_SSP_CR0_SSE) | // SSP enable
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259 (37 << AAEC_SSP_CR0_SCR) | // Serial clock rate
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260 (AAEC_SSP_CR0_FRF_NAT << AAEC_SSP_CR0_FRF) | // MicroWire
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261 ((12-1) << AAEC_SSP_CR0_SIZE); // 12 bit words
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262 *(volatile cyg_uint32 *)AAEC_SSP_CR1 =
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263 (1 << AAEC_SSP_CR1_FEN); // Enable FIFO
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264 *(volatile cyg_uint32 *)AAEC_SSP_CPSR = 2; // Clock prescale
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265 *(volatile cyg_uint32 *)AAEC_PFDDR &= ~(1<<0); // TS uses port F bit 0
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266 cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_TS);
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267 cyg_selinit(&ts_select_info);
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268 return true;
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269 }
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270
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271 static cyg_uint32
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272 read_ts(int axis)
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273 {
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274 cyg_uint32 res;
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275
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276 *(volatile cyg_uint32 *)AAEC_SSP_DR = (axis | ADS_START | ADS_MODE_12_BIT | ADS_PD0);
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277 *(volatile cyg_uint32 *)AAEC_SSP_DR = (axis | ADS_START | ADS_MODE_12_BIT);
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278 // Wait for data
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279 while ((*(volatile cyg_uint32 *)AAEC_SSP_SR & AAEC_SSP_SR_RNE) == 0);
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280 res = *(volatile cyg_uint32 *)AAEC_SSP_DR; // ignore first datum
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281 // Wait for data
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282 while ((*(volatile cyg_uint32 *)AAEC_SSP_SR & AAEC_SSP_SR_RNE) == 0);
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283 res = *(volatile cyg_uint32 *)AAEC_SSP_DR;
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284 return res;
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285 }
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286
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287 static void
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288 ts_scan(cyg_addrword_t param)
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289 {
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290 short lastX, lastY;
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291 short x, y;
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292 struct _event *ev;
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293 bool pen_down;
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294
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295 diag_printf("Touch Screen thread started\n");
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296 // Discard the first sample - it's always 0
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297 x = read_ts(ADS_MEASURE_X);
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298 y = read_ts(ADS_MEASURE_Y);
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299 lastX = lastY = -1;
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300 pen_down = false;
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301 while (true) {
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302 cyg_thread_delay(SCAN_DELAY);
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303 if ((*(volatile cyg_uint32 *)AAEC_PFDR & TS_INT) == 0) {
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304 // Pen is down
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305 x = read_ts(ADS_MEASURE_X);
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306 y = read_ts(ADS_MEASURE_Y);
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307 // diag_printf("X = %x, Y = %x\n", x, y);
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308 if ((x < X_THRESHOLD) || (y < Y_THRESHOLD)) {
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309 // Ignore 'bad' samples
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310 continue;
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311 }
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312 lastX = x; lastY = y;
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313 pen_down = true;
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314 } else {
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315 if (pen_down) {
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316 // Capture first 'up' event
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317 pen_down = false;
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318 x = lastX;
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319 y = lastY;
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320 } else {
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321 continue; // Nothing new to report
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322 }
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323 }
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324 if (num_events < MAX_EVENTS) {
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325 num_events++;
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326 ev = &_events[_event_put++];
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327 if (_event_put == MAX_EVENTS) {
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328 _event_put = 0;
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329 }
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330 ev->button_state = pen_down ? 0x04 : 0x00;
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331 ev->xPos = x;
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332 ev->yPos = y;
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333 if (ts_select_active) {
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334 ts_select_active = false;
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335 cyg_selwakeup(&ts_select_info);
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336 }
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337 }
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338 #ifdef DEBUG_RAW_EVENTS
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339 memcpy(&_ts_buf[_ts_buf_ptr], pkt->data, 8);
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340 _ts_buf_ptr += 8;
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341 if (_ts_buf_ptr == 512) {
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342 diag_printf("TS handler\n");
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343 diag_dump_buf(_ts_buf, 512);
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344 _ts_buf_ptr = 0;
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345 }
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346 #endif
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347 }
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348 }
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349
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350 static Cyg_ErrNo
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351 ts_lookup(struct cyg_devtab_entry **tab,
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352 struct cyg_devtab_entry *st,
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353 const char *name)
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354 {
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355 if (!_is_open) {
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356 _is_open = true;
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357 cyg_thread_create(1, // Priority
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358 ts_scan, // entry
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359 0, // entry parameter
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360 "Touch Screen scan", // Name
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361 &ts_scan_stack[0], // Stack
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362 STACK_SIZE, // Size
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363 &ts_scan_thread_handle, // Handle
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364 &ts_scan_thread_data // Thread data structure
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365 );
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366 cyg_thread_resume(ts_scan_thread_handle); // Start it
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367 }
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368 return ENOERR;
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369 }