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annotate packages/devs/touch/arm/aaed2000/current/src/aaed2000_ts.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents d2c90368aeef
children
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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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas
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44 // Date: 2002-03-05
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45 // Purpose:
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46 // Description: Touchscreen driver for Agilent AAED2000
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //==========================================================================
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51
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52
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53 #include <pkgconf/devs_touch_aaed2000.h>
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54
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55 #include <cyg/kernel/kapi.h>
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56 #include <cyg/hal/hal_io.h>
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57 #include <cyg/hal/hal_arch.h>
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58 #include <cyg/hal/drv_api.h>
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59 #include <cyg/hal/hal_intr.h>
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60 #include <cyg/hal/aaed2000.h>
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61 #include <cyg/infra/cyg_type.h>
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62 #include <cyg/infra/cyg_ass.h>
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63 #include <cyg/infra/diag.h>
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64
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65 #include <cyg/fileio/fileio.h> // For select() functionality
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66 static cyg_selinfo ts_select_info;
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67 static cyg_bool ts_select_active;
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68
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69 #include <cyg/io/devtab.h>
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70
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71 /* ADS7846 flags */
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72 #define ADS_START (1 << 7)
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73 #define ADS_MEASURE_Y (0x01 << 4)
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74 #define ADS_MEASURE_X (0x05 << 4)
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75 #define ADS_MODE_12_BIT 0
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76 #define ADS_PD0 0
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77
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78 // Misc constants
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79 #define TS_INT (1<<0)
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80 #define X_THRESHOLD 0x80
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81 #define Y_THRESHOLD 0x80
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82
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83 // Functions in this module
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84
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85 static Cyg_ErrNo ts_read(cyg_io_handle_t handle,
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86 void *buffer,
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87 cyg_uint32 *len);
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88 static cyg_bool ts_select(cyg_io_handle_t handle,
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89 cyg_uint32 which,
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90 cyg_addrword_t info);
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91 static Cyg_ErrNo ts_set_config(cyg_io_handle_t handle,
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92 cyg_uint32 key,
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93 const void *buffer,
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94 cyg_uint32 *len);
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95 static Cyg_ErrNo ts_get_config(cyg_io_handle_t handle,
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96 cyg_uint32 key,
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97 void *buffer,
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98 cyg_uint32 *len);
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99 static bool ts_init(struct cyg_devtab_entry *tab);
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100 static Cyg_ErrNo ts_lookup(struct cyg_devtab_entry **tab,
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101 struct cyg_devtab_entry *st,
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102 const char *name);
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103
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104 CHAR_DEVIO_TABLE(aaed2000_ts_handlers,
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105 NULL, // Unsupported write() function
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106 ts_read,
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107 ts_select,
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108 ts_get_config,
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109 ts_set_config);
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110
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111 CHAR_DEVTAB_ENTRY(aaed2000_ts_device,
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112 CYGDAT_DEVS_TOUCH_AAED2000_NAME,
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113 NULL, // Base device name
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114 &aaed2000_ts_handlers,
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115 ts_init,
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116 ts_lookup,
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117 NULL); // Private data pointer
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118
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119 struct _event {
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120 short button_state;
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121 short xPos, yPos;
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122 short _unused;
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123 };
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124 #define MAX_EVENTS CYGNUM_DEVS_TOUCH_AAED2000_EVENT_BUFFER_SIZE
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125 static int num_events;
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126 static int _event_put, _event_get;
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127 static struct _event _events[MAX_EVENTS];
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128
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129 static bool _is_open = false;
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130 #ifdef DEBUG_RAW_EVENTS
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131 static unsigned char _ts_buf[512];
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132 static int _ts_buf_ptr = 0;
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133 #endif
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134
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135 #define STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
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136 static char ts_scan_stack[STACK_SIZE];
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137 static cyg_thread ts_scan_thread_data;
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138 static cyg_handle_t ts_scan_thread_handle;
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139 #define SCAN_FREQ 20 // Hz
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140 //#define SCAN_FREQ 5 // Hz
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141 #define SCAN_DELAY ((1000/SCAN_FREQ)/10)
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142
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143
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144 typedef struct {
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145 short min;
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146 short max;
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147 short span;
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148 } bounds;
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149
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150 static bounds xBounds = {1024, 0, 1024};
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151 static bounds yBounds = {1024, 0, 1024};
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152
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153 static Cyg_ErrNo
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154 ts_read(cyg_io_handle_t handle,
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155 void *buffer,
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156 cyg_uint32 *len)
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157 {
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158 struct _event *ev;
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159 int tot = *len;
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160 unsigned char *bp = (unsigned char *)buffer;
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161
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162 cyg_scheduler_lock(); // Prevent interaction with DSR code
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163 while (tot >= sizeof(struct _event)) {
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164 if (num_events > 0) {
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165 ev = &_events[_event_get++];
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166 if (_event_get == MAX_EVENTS) {
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167 _event_get = 0;
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168 }
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169 // Self calibrate
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170 if (ev->xPos > xBounds.max) xBounds.max = ev->xPos;
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171 if (ev->xPos < xBounds.min) xBounds.min = ev->xPos;
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172 if (ev->yPos > yBounds.max) yBounds.max = ev->yPos;
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173 if (ev->yPos < yBounds.min) yBounds.min = ev->yPos;
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174 if ((xBounds.span = xBounds.max - xBounds.min) <= 1) {
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175 xBounds.span = 1;
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176 }
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177 if ((yBounds.span = yBounds.max - yBounds.min) <= 1) {
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178 yBounds.span = 1;
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179 }
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180 // Scale values - done here so these potentially lengthy
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181 // operations take place outside of interrupt processing
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182 #ifdef DEBUG
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183 diag_printf("Raw[%d,%d], X[%d,%d,%d], Y[%d,%d,%d]",
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184 ev->xPos, ev->yPos,
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185 xBounds.max, xBounds.min, xBounds.span,
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186 yBounds.max, yBounds.min, yBounds.span);
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187 #endif
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188 ev->xPos = 640 - (((xBounds.max - ev->xPos) * 640) / xBounds.span);
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189 ev->yPos = 480 - (((yBounds.max - ev->yPos) * 480) / yBounds.span);
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190 #ifdef DEBUG
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191 diag_printf(", Cooked[%d,%d]\n",
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192 ev->xPos, ev->yPos);
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193 #endif
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194 memcpy(bp, ev, sizeof(*ev));
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195 bp += sizeof(*ev);
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196 tot -= sizeof(*ev);
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197 num_events--;
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198 } else {
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199 break; // No more events
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200 }
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201 }
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202 cyg_scheduler_unlock(); // Allow DSRs again
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203 *len -= tot;
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204 return ENOERR;
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205 }
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206
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207 static cyg_bool
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208 ts_select(cyg_io_handle_t handle,
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209 cyg_uint32 which,
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210 cyg_addrword_t info)
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211 {
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212 if (which == CYG_FREAD) {
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213 cyg_scheduler_lock(); // Prevent interaction with DSR code
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214 if (num_events > 0) {
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215 cyg_scheduler_unlock(); // Reallow interaction with DSR code
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216 return true;
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217 }
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218 if (!ts_select_active) {
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219 ts_select_active = true;
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220 cyg_selrecord(info, &ts_select_info);
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221 }
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222 cyg_scheduler_unlock(); // Reallow interaction with DSR code
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223 }
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224 return false;
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225 }
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226
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227 static Cyg_ErrNo
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228 ts_set_config(cyg_io_handle_t handle,
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229 cyg_uint32 key,
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230 const void *buffer,
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231 cyg_uint32 *len)
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232 {
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233 return EINVAL;
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234 }
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235
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236 static Cyg_ErrNo
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237 ts_get_config(cyg_io_handle_t handle,
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238 cyg_uint32 key,
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239 void *buffer,
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240 cyg_uint32 *len)
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241 {
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242 return EINVAL;
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243 }
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244
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245 static bool
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246 ts_init(struct cyg_devtab_entry *tab)
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247 {
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248 cyg_uint32 _dummy;
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249
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250 // Initialize SSP interface
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251 #if 0
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252 while (*(volatile cyg_uint32 *)AAEC_SSP_SR & AAEC_SSP_SR_RNE) {
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253 _dummy = *(volatile cyg_uint32 *)AAEC_SSP_DR; // Drain FIFO
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254 }
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255 #endif
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256 *(volatile cyg_uint32 *)AAEC_SSP_CR0 =
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257 (1 << AAEC_SSP_CR0_SSE) | // SSP enable
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258 (37 << AAEC_SSP_CR0_SCR) | // Serial clock rate
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259 (AAEC_SSP_CR0_FRF_NAT << AAEC_SSP_CR0_FRF) | // MicroWire
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260 ((12-1) << AAEC_SSP_CR0_SIZE); // 12 bit words
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261 *(volatile cyg_uint32 *)AAEC_SSP_CR1 =
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262 (1 << AAEC_SSP_CR1_FEN); // Enable FIFO
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263 *(volatile cyg_uint32 *)AAEC_SSP_CPSR = 2; // Clock prescale
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264 *(volatile cyg_uint32 *)AAEC_PFDDR &= ~(1<<0); // TS uses port F bit 0
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265 cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_TS);
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266 cyg_selinit(&ts_select_info);
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267 return true;
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268 }
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269
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270 static cyg_uint32
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271 read_ts(int axis)
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272 {
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273 cyg_uint32 res;
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274
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275 *(volatile cyg_uint32 *)AAEC_SSP_DR = (axis | ADS_START | ADS_MODE_12_BIT | ADS_PD0);
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276 *(volatile cyg_uint32 *)AAEC_SSP_DR = (axis | ADS_START | ADS_MODE_12_BIT);
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277 // Wait for data
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278 while ((*(volatile cyg_uint32 *)AAEC_SSP_SR & AAEC_SSP_SR_RNE) == 0);
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279 res = *(volatile cyg_uint32 *)AAEC_SSP_DR; // ignore first datum
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280 // Wait for data
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281 while ((*(volatile cyg_uint32 *)AAEC_SSP_SR & AAEC_SSP_SR_RNE) == 0);
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282 res = *(volatile cyg_uint32 *)AAEC_SSP_DR;
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283 return res;
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284 }
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285
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286 static void
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287 ts_scan(cyg_addrword_t param)
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288 {
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289 short lastX, lastY;
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290 short x, y;
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291 struct _event *ev;
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292 bool pen_down;
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293
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294 diag_printf("Touch Screen thread started\n");
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295 // Discard the first sample - it's always 0
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296 x = read_ts(ADS_MEASURE_X);
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297 y = read_ts(ADS_MEASURE_Y);
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298 lastX = lastY = -1;
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299 pen_down = false;
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300 while (true) {
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301 cyg_thread_delay(SCAN_DELAY);
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302 if ((*(volatile cyg_uint32 *)AAEC_PFDR & TS_INT) == 0) {
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303 // Pen is down
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304 x = read_ts(ADS_MEASURE_X);
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305 y = read_ts(ADS_MEASURE_Y);
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306 // diag_printf("X = %x, Y = %x\n", x, y);
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307 if ((x < X_THRESHOLD) || (y < Y_THRESHOLD)) {
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308 // Ignore 'bad' samples
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309 continue;
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310 }
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311 lastX = x; lastY = y;
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312 pen_down = true;
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313 } else {
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314 if (pen_down) {
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315 // Capture first 'up' event
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316 pen_down = false;
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317 x = lastX;
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318 y = lastY;
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319 } else {
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320 continue; // Nothing new to report
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321 }
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322 }
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323 if (num_events < MAX_EVENTS) {
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324 num_events++;
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325 ev = &_events[_event_put++];
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326 if (_event_put == MAX_EVENTS) {
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327 _event_put = 0;
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328 }
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329 ev->button_state = pen_down ? 0x04 : 0x00;
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330 ev->xPos = x;
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331 ev->yPos = y;
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332 if (ts_select_active) {
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333 ts_select_active = false;
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334 cyg_selwakeup(&ts_select_info);
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335 }
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336 }
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337 #ifdef DEBUG_RAW_EVENTS
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338 memcpy(&_ts_buf[_ts_buf_ptr], pkt->data, 8);
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339 _ts_buf_ptr += 8;
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340 if (_ts_buf_ptr == 512) {
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341 diag_printf("TS handler\n");
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342 diag_dump_buf(_ts_buf, 512);
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343 _ts_buf_ptr = 0;
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344 }
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345 #endif
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346 }
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347 }
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348
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349 static Cyg_ErrNo
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350 ts_lookup(struct cyg_devtab_entry **tab,
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351 struct cyg_devtab_entry *st,
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352 const char *name)
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353 {
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354 if (!_is_open) {
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355 _is_open = true;
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356 cyg_thread_create(1, // Priority
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357 ts_scan, // entry
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358 0, // entry parameter
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359 "Touch Screen scan", // Name
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360 &ts_scan_stack[0], // Stack
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361 STACK_SIZE, // Size
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362 &ts_scan_thread_handle, // Handle
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363 &ts_scan_thread_data // Thread data structure
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364 );
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365 cyg_thread_resume(ts_scan_thread_handle); // Start it
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366 }
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367 return ENOERR;
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368 }