Guillermo Stedile / RA8875

Forked para SNOCC

Dependencies:   GPS

Dependents:   SNOCC_V1 SNOCC_V2

Fork of RA8875 by SNOCC

RA8875_Touch.cpp@83:7bad0068cca0, 2015-01-01 (annotated)

Committer:
WiredHome
Date:
Thu Jan 01 20:35:37 2015 +0000
Revision:
83:7bad0068cca0
Parent:
81:01da2e34283d
Child:
85:022bba13c5c4
Improve touch interface to automatically provide no_touch, touch, held, release, no_cal value.; Touch API return codes were modified to accommodate this.; Enhance some APIs with (point_t p) parameters.; Minor internal documentation improvement.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WiredHome 78:faf49c381591 1 /// This file contains the RA8875 Touch panel methods.
WiredHome 78:faf49c381591 2 ///
WiredHome 78:faf49c381591 3
WiredHome 78:faf49c381591 4 #include "RA8875.h"
WiredHome 78:faf49c381591 5
WiredHome 83:7bad0068cca0 6 #define NOTOUCH_TIMEOUT_uS 100000
WiredHome 83:7bad0068cca0 7 #define TOUCH_TICKER_uS 1000
WiredHome 83:7bad0068cca0 8
WiredHome 78:faf49c381591 9 // ### Touch Panel support code additions begin here
WiredHome 78:faf49c381591 10
WiredHome 78:faf49c381591 11 RetCode_t RA8875::TouchPanelInit(void)
WiredHome 78:faf49c381591 12 {
WiredHome 78:faf49c381591 13 //TPCR0: Set enable bit, default sample time, wakeup, and ADC clock
WiredHome 78:faf49c381591 14 WriteCommand(TPCR0, TP_ENABLE | TP_ADC_SAMPLE_DEFAULT_CLKS | TP_ADC_CLKDIV_DEFAULT);
WiredHome 78:faf49c381591 15 // TPCR1: Set auto/manual, Ref voltage, debounce, manual mode params
WiredHome 78:faf49c381591 16 WriteCommand(TPCR1, TP_MODE_DEFAULT | TP_DEBOUNCE_DEFAULT);
WiredHome 78:faf49c381591 17 WriteCommand(INTC1, ReadCommand(INTC1) | RA8875_INT_TP); // reg INTC1: Enable Touch Panel Interrupts (D2 = 1)
WiredHome 78:faf49c381591 18 WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear any TP interrupt flag
WiredHome 83:7bad0068cca0 19 touchSample = 0;
WiredHome 83:7bad0068cca0 20 touchState = no_cal;
WiredHome 83:7bad0068cca0 21 touchTicker.attach_us(this, &RA8875::_TouchTicker, TOUCH_TICKER_uS);
WiredHome 83:7bad0068cca0 22 touchTimer.start();
WiredHome 83:7bad0068cca0 23 touchTimer.reset();
WiredHome 78:faf49c381591 24 return noerror;
WiredHome 78:faf49c381591 25 }
WiredHome 78:faf49c381591 26
WiredHome 78:faf49c381591 27 RetCode_t RA8875::TouchPanelInit(uint8_t bTpEnable, uint8_t bTpAutoManual, uint8_t bTpDebounce, uint8_t bTpManualMode, uint8_t bTpAdcClkDiv, uint8_t bTpAdcSampleTime)
WiredHome 78:faf49c381591 28 {
WiredHome 78:faf49c381591 29 // Parameter bounds check
WiredHome 78:faf49c381591 30 if( \
WiredHome 78:faf49c381591 31 !(bTpEnable == TP_ENABLE || bTpEnable == TP_ENABLE) || \
WiredHome 78:faf49c381591 32 !(bTpAutoManual == TP_MODE_AUTO || bTpAutoManual == TP_MODE_MANUAL) || \
WiredHome 78:faf49c381591 33 !(bTpDebounce == TP_DEBOUNCE_OFF || bTpDebounce == TP_DEBOUNCE_ON) || \
WiredHome 78:faf49c381591 34 !(bTpManualMode <= TP_MANUAL_LATCH_Y) || \
WiredHome 78:faf49c381591 35 !(bTpAdcClkDiv <= TP_ADC_CLKDIV_128) || \
WiredHome 78:faf49c381591 36 !(bTpAdcSampleTime <= TP_ADC_SAMPLE_65536_CLKS) \
WiredHome 78:faf49c381591 37 ) return bad_parameter;
WiredHome 78:faf49c381591 38 // Construct the config byte for TPCR0 and write them
WiredHome 78:faf49c381591 39 WriteCommand(TPCR0, bTpEnable | bTpAdcClkDiv | bTpAdcSampleTime); // Note: Wakeup is never enabled
WiredHome 78:faf49c381591 40 // Construct the config byte for TPCR1 and write them
WiredHome 78:faf49c381591 41 WriteCommand(TPCR1, bTpManualMode | bTpDebounce | bTpManualMode); // Note: Always uses internal Vref.
WiredHome 78:faf49c381591 42 // Set up the interrupt flag and enable bits
WiredHome 78:faf49c381591 43 WriteCommand(INTC1, ReadCommand(INTC1) | RA8875_INT_TP); // reg INTC1: Enable Touch Panel Interrupts (D2 = 1)
WiredHome 78:faf49c381591 44 WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear any TP interrupt flag
WiredHome 83:7bad0068cca0 45 touchSample = 0;
WiredHome 83:7bad0068cca0 46 touchState = no_cal;
WiredHome 83:7bad0068cca0 47 if (bTpEnable == TP_ENABLE) {
WiredHome 83:7bad0068cca0 48 touchTicker.attach_us(this, &RA8875::_TouchTicker, TOUCH_TICKER_uS);
WiredHome 83:7bad0068cca0 49 touchTimer.start();
WiredHome 83:7bad0068cca0 50 touchTimer.reset();
WiredHome 83:7bad0068cca0 51 } else {
WiredHome 83:7bad0068cca0 52 touchTicker.detach();
WiredHome 83:7bad0068cca0 53 touchTimer.stop();
WiredHome 83:7bad0068cca0 54 }
WiredHome 78:faf49c381591 55 return noerror;
WiredHome 78:faf49c381591 56 }
WiredHome 78:faf49c381591 57
WiredHome 81:01da2e34283d 58 // +----------------------------------------------------+
WiredHome 81:01da2e34283d 59 // | |
WiredHome 81:01da2e34283d 60 // | 1 |
WiredHome 81:01da2e34283d 61 // | |
WiredHome 81:01da2e34283d 62 // | |
WiredHome 81:01da2e34283d 63 // | 2 |
WiredHome 81:01da2e34283d 64 // | |
WiredHome 81:01da2e34283d 65 // | |
WiredHome 81:01da2e34283d 66 // | 3 |
WiredHome 81:01da2e34283d 67 // | |
WiredHome 81:01da2e34283d 68 // +----------------------------------------------------+
WiredHome 81:01da2e34283d 69
WiredHome 81:01da2e34283d 70
WiredHome 81:01da2e34283d 71 RetCode_t RA8875::TouchPanelCalibrate(tpMatrix_t * matrix)
WiredHome 81:01da2e34283d 72 {
WiredHome 81:01da2e34283d 73 return TouchPanelCalibrate(NULL, matrix);
WiredHome 81:01da2e34283d 74 }
WiredHome 81:01da2e34283d 75
WiredHome 81:01da2e34283d 76
WiredHome 81:01da2e34283d 77 RetCode_t RA8875::TouchPanelCalibrate(const char * msg, tpMatrix_t * matrix)
WiredHome 81:01da2e34283d 78 {
WiredHome 81:01da2e34283d 79 point_t pTest[3];
WiredHome 81:01da2e34283d 80 point_t pSample[3];
WiredHome 83:7bad0068cca0 81 int x,y;
WiredHome 81:01da2e34283d 82
WiredHome 83:7bad0068cca0 83 while (TouchPanelA2DFiltered(&x, &y))
WiredHome 83:7bad0068cca0 84 wait_ms(20);
WiredHome 81:01da2e34283d 85 cls();
WiredHome 81:01da2e34283d 86 if (msg)
WiredHome 81:01da2e34283d 87 puts(msg);
WiredHome 81:01da2e34283d 88 SetTextCursor(0,height()/2);
WiredHome 81:01da2e34283d 89 pTest[0].x = 50; pTest[0].y = 50;
WiredHome 81:01da2e34283d 90 pTest[1].x = width() - 50; pTest[1].y = height()/2;
WiredHome 81:01da2e34283d 91 pTest[2].x = width()/2; pTest[2].y = height() - 50;
WiredHome 81:01da2e34283d 92 for (int i=0; i<3; i++) {
WiredHome 81:01da2e34283d 93 foreground(Blue);
WiredHome 81:01da2e34283d 94 printf(" (%3d,%3d) => ", pTest[i].x, pTest[i].y);
WiredHome 81:01da2e34283d 95 line(pTest[i].x-10, pTest[i].y, pTest[i].x+10, pTest[i].y, White);
WiredHome 81:01da2e34283d 96 line(pTest[i].x, pTest[i].y-10, pTest[i].x, pTest[i].y+10, White);
WiredHome 81:01da2e34283d 97 while (!TouchPanelA2DFiltered(&x, &y))
WiredHome 81:01da2e34283d 98 wait_ms(20);
WiredHome 81:01da2e34283d 99 pSample[i].x = x;
WiredHome 81:01da2e34283d 100 pSample[i].y = y;
WiredHome 81:01da2e34283d 101 line(pTest[i].x-10, pTest[i].y, pTest[i].x+10, pTest[i].y, Black);
WiredHome 81:01da2e34283d 102 line(pTest[i].x, pTest[i].y-10, pTest[i].x, pTest[i].y+10, Black);
WiredHome 81:01da2e34283d 103 foreground(Blue);
WiredHome 81:01da2e34283d 104 printf(" (%4d,%4d)\r\n", x,y);
WiredHome 81:01da2e34283d 105 while (TouchPanelA2DFiltered(&x, &y))
WiredHome 81:01da2e34283d 106 wait_ms(20);
WiredHome 81:01da2e34283d 107 wait(2);
WiredHome 81:01da2e34283d 108 }
WiredHome 81:01da2e34283d 109 return TouchPanelComputeCalibration(pTest, pSample, matrix);
WiredHome 81:01da2e34283d 110 }
WiredHome 81:01da2e34283d 111
WiredHome 81:01da2e34283d 112
WiredHome 81:01da2e34283d 113 /**********************************************************************
WiredHome 81:01da2e34283d 114 *
WiredHome 81:01da2e34283d 115 * Function: getDisplayPoint()
WiredHome 81:01da2e34283d 116 *
WiredHome 81:01da2e34283d 117 * Description: Given a valid set of calibration factors and a point
WiredHome 81:01da2e34283d 118 * value reported by the touch screen, this function
WiredHome 81:01da2e34283d 119 * calculates and returns the true (or closest to true)
WiredHome 81:01da2e34283d 120 * display point below the spot where the touch screen
WiredHome 81:01da2e34283d 121 * was touched.
WiredHome 81:01da2e34283d 122 *
WiredHome 81:01da2e34283d 123 *
WiredHome 81:01da2e34283d 124 *
WiredHome 81:01da2e34283d 125 * Argument(s): displayPtr (output) - Pointer to the calculated
WiredHome 81:01da2e34283d 126 * (true) display point.
WiredHome 81:01da2e34283d 127 * screenPtr (input) - Pointer to the reported touch
WiredHome 81:01da2e34283d 128 * screen point.
WiredHome 81:01da2e34283d 129 * matrixPtr (input) - Pointer to calibration factors
WiredHome 81:01da2e34283d 130 * matrix previously calculated
WiredHome 81:01da2e34283d 131 * from a call to
WiredHome 81:01da2e34283d 132 * setCalibrationMatrix()
WiredHome 81:01da2e34283d 133 *
WiredHome 81:01da2e34283d 134 *
WiredHome 81:01da2e34283d 135 * The function simply solves for Xd and Yd by implementing the
WiredHome 81:01da2e34283d 136 * computations required by the translation matrix.
WiredHome 81:01da2e34283d 137 *
WiredHome 81:01da2e34283d 138 * /- -\
WiredHome 81:01da2e34283d 139 * /- -\ /- -\ | |
WiredHome 81:01da2e34283d 140 * | | | | | Xs |
WiredHome 81:01da2e34283d 141 * | Xd | | A B C | | |
WiredHome 81:01da2e34283d 142 * | | = | | * | Ys |
WiredHome 81:01da2e34283d 143 * | Yd | | D E F | | |
WiredHome 81:01da2e34283d 144 * | | | | | 1 |
WiredHome 81:01da2e34283d 145 * \- -/ \- -/ | |
WiredHome 81:01da2e34283d 146 * \- -/
WiredHome 81:01da2e34283d 147 *
WiredHome 81:01da2e34283d 148 * It must be kept brief to avoid consuming CPU cycles.
WiredHome 81:01da2e34283d 149 *
WiredHome 81:01da2e34283d 150 * Return: OK - the display point was correctly calculated
WiredHome 81:01da2e34283d 151 * and its value is in the output argument.
WiredHome 81:01da2e34283d 152 * NOT_OK - an error was detected and the function
WiredHome 81:01da2e34283d 153 * failed to return a valid point.
WiredHome 81:01da2e34283d 154 *
WiredHome 81:01da2e34283d 155 * NOTE! NOTE! NOTE!
WiredHome 81:01da2e34283d 156 *
WiredHome 81:01da2e34283d 157 * setCalibrationMatrix() and getDisplayPoint() will do fine
WiredHome 81:01da2e34283d 158 * for you as they are, provided that your digitizer
WiredHome 81:01da2e34283d 159 * resolution does not exceed 10 bits (1024 values). Higher
WiredHome 81:01da2e34283d 160 * resolutions may cause the integer operations to overflow
WiredHome 81:01da2e34283d 161 * and return incorrect values. If you wish to use these
WiredHome 81:01da2e34283d 162 * functions with digitizer resolutions of 12 bits (4096
WiredHome 81:01da2e34283d 163 * values) you will either have to a) use 64-bit signed
WiredHome 81:01da2e34283d 164 * integer variables and math, or b) judiciously modify the
WiredHome 81:01da2e34283d 165 * operations to scale results by a factor of 2 or even 4.
WiredHome 81:01da2e34283d 166 *
WiredHome 81:01da2e34283d 167 */
WiredHome 83:7bad0068cca0 168 TouchCode_t RA8875::TouchPanelReadable(point_t * TouchPoint)
WiredHome 81:01da2e34283d 169 {
WiredHome 83:7bad0068cca0 170 int a2dX = 0;
WiredHome 83:7bad0068cca0 171 int a2dY = 0;
WiredHome 81:01da2e34283d 172
WiredHome 83:7bad0068cca0 173 TouchCode_t ts = TouchPanelA2DFiltered(&a2dX, &a2dY);
WiredHome 83:7bad0068cca0 174 if (ts != no_touch) {
WiredHome 81:01da2e34283d 175 if (tpMatrix.Divider != 0 && TouchPoint) {
WiredHome 81:01da2e34283d 176 /* Operation order is important since we are doing integer */
WiredHome 81:01da2e34283d 177 /* math. Make sure you add all terms together before */
WiredHome 81:01da2e34283d 178 /* dividing, so that the remainder is not rounded off */
WiredHome 81:01da2e34283d 179 /* prematurely. */
WiredHome 83:7bad0068cca0 180 TouchPoint->x = ( (tpMatrix.An * a2dX) +
WiredHome 83:7bad0068cca0 181 (tpMatrix.Bn * a2dY) +
WiredHome 81:01da2e34283d 182 tpMatrix.Cn
WiredHome 81:01da2e34283d 183 ) / tpMatrix.Divider ;
WiredHome 81:01da2e34283d 184
WiredHome 83:7bad0068cca0 185 TouchPoint->y = ( (tpMatrix.Dn * a2dX) +
WiredHome 83:7bad0068cca0 186 (tpMatrix.En * a2dY) +
WiredHome 81:01da2e34283d 187 tpMatrix.Fn
WiredHome 81:01da2e34283d 188 ) / tpMatrix.Divider ;
WiredHome 81:01da2e34283d 189 } else {
WiredHome 83:7bad0068cca0 190 ts = no_cal;
WiredHome 81:01da2e34283d 191 }
WiredHome 81:01da2e34283d 192 }
WiredHome 83:7bad0068cca0 193 return ts;
WiredHome 81:01da2e34283d 194 }
WiredHome 81:01da2e34283d 195
WiredHome 81:01da2e34283d 196
WiredHome 81:01da2e34283d 197 RetCode_t RA8875::TouchPanelSetMatrix(tpMatrix_t * matrixPtr)
WiredHome 81:01da2e34283d 198 {
WiredHome 81:01da2e34283d 199 if (matrixPtr == NULL || matrixPtr->Divider == 0)
WiredHome 81:01da2e34283d 200 return bad_parameter;
WiredHome 81:01da2e34283d 201 memcpy(&tpMatrix, matrixPtr, sizeof(tpMatrix_t));
WiredHome 83:7bad0068cca0 202 touchState = no_touch;
WiredHome 81:01da2e34283d 203 return noerror;
WiredHome 81:01da2e34283d 204 }
WiredHome 81:01da2e34283d 205
WiredHome 81:01da2e34283d 206
WiredHome 83:7bad0068cca0 207 static void InsertionSort(int * buf, int bufsize)
WiredHome 83:7bad0068cca0 208 {
WiredHome 83:7bad0068cca0 209 int i, j;
WiredHome 83:7bad0068cca0 210 int temp;
WiredHome 83:7bad0068cca0 211
WiredHome 83:7bad0068cca0 212 for(i = 1; i <= bufsize; i++) {
WiredHome 83:7bad0068cca0 213 temp = buf[i];
WiredHome 83:7bad0068cca0 214 j = i;
WiredHome 83:7bad0068cca0 215 while( j && (buf[j-1] > temp) ) {
WiredHome 83:7bad0068cca0 216 buf[j] = buf[j-1];
WiredHome 83:7bad0068cca0 217 j = j-1;
WiredHome 83:7bad0068cca0 218 }
WiredHome 83:7bad0068cca0 219 buf[j] = temp;
WiredHome 83:7bad0068cca0 220 } // End of sort
WiredHome 83:7bad0068cca0 221 }
WiredHome 83:7bad0068cca0 222
WiredHome 83:7bad0068cca0 223
WiredHome 83:7bad0068cca0 224 void RA8875::_TouchTicker(void)
WiredHome 78:faf49c381591 225 {
WiredHome 83:7bad0068cca0 226 if (touchTimer.read_us() > NOTOUCH_TIMEOUT_uS) {
WiredHome 83:7bad0068cca0 227 touchSample = 0;
WiredHome 83:7bad0068cca0 228 if (touchState == held)
WiredHome 83:7bad0068cca0 229 touchState = release;
WiredHome 83:7bad0068cca0 230 else
WiredHome 83:7bad0068cca0 231 touchState = no_touch;
WiredHome 83:7bad0068cca0 232 touchTimer.reset();
WiredHome 83:7bad0068cca0 233 }
WiredHome 83:7bad0068cca0 234 }
WiredHome 83:7bad0068cca0 235
WiredHome 83:7bad0068cca0 236 TouchCode_t RA8875::TouchPanelA2DRaw(int *x, int *y)
WiredHome 83:7bad0068cca0 237 {
WiredHome 83:7bad0068cca0 238 if( (ReadCommand(INTC2) & RA8875_INT_TP) ) { // Test for TP Interrupt pending in register INTC2
WiredHome 83:7bad0068cca0 239 touchTimer.reset();
WiredHome 83:7bad0068cca0 240 *y = ReadCommand(TPYH) << 2 | ( (ReadCommand(TPXYL) & 0xC) >> 2 ); // D[9:2] from reg TPYH, D[1:0] from reg TPXYL[3:2]
WiredHome 83:7bad0068cca0 241 *x = ReadCommand(TPXH) << 2 | ( (ReadCommand(TPXYL) & 0x3) ); // D[9:2] from reg TPXH, D[1:0] from reg TPXYL[1:0]
WiredHome 83:7bad0068cca0 242 WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear that TP interrupt flag
WiredHome 83:7bad0068cca0 243 touchState = touch;
WiredHome 83:7bad0068cca0 244 } else {
WiredHome 83:7bad0068cca0 245 touchState = no_touch;
WiredHome 83:7bad0068cca0 246 }
WiredHome 83:7bad0068cca0 247 return touchState;
WiredHome 83:7bad0068cca0 248 }
WiredHome 83:7bad0068cca0 249
WiredHome 83:7bad0068cca0 250 TouchCode_t RA8875::TouchPanelA2DFiltered(int *x, int *y)
WiredHome 83:7bad0068cca0 251 {
WiredHome 83:7bad0068cca0 252 static int xbuf[TPBUFSIZE], ybuf[TPBUFSIZE];
WiredHome 83:7bad0068cca0 253 static int lastX, lastY;
WiredHome 83:7bad0068cca0 254 int i, j;
WiredHome 83:7bad0068cca0 255 TouchCode_t ret = touchState;
WiredHome 78:faf49c381591 256
WiredHome 78:faf49c381591 257 if( (ReadCommand(INTC2) & RA8875_INT_TP) ) { // Test for TP Interrupt pending in register INTC2
WiredHome 83:7bad0068cca0 258 touchTimer.reset();
WiredHome 78:faf49c381591 259 // Get the next data samples
WiredHome 83:7bad0068cca0 260 ybuf[touchSample] = ReadCommand(TPYH) << 2 | ( (ReadCommand(TPXYL) & 0xC) >> 2 ); // D[9:2] from reg TPYH, D[1:0] from reg TPXYL[3:2]
WiredHome 83:7bad0068cca0 261 xbuf[touchSample] = ReadCommand(TPXH) << 2 | ( (ReadCommand(TPXYL) & 0x3) ); // D[9:2] from reg TPXH, D[1:0] from reg TPXYL[1:0]
WiredHome 78:faf49c381591 262 // Check for a complete set
WiredHome 83:7bad0068cca0 263 if(++touchSample == TPBUFSIZE) {
WiredHome 78:faf49c381591 264 // Buffers are full, so process them using Finn's method described in Analog Dialogue No. 44, Feb 2010
WiredHome 78:faf49c381591 265 // This requires sorting the samples in order of size, then discarding the top 25% and
WiredHome 78:faf49c381591 266 // bottom 25% as noise spikes. Finally, the middle 50% of the values are averaged to
WiredHome 78:faf49c381591 267 // reduce Gaussian noise.
WiredHome 83:7bad0068cca0 268 #if 1
WiredHome 83:7bad0068cca0 269 InsertionSort(ybuf, TPBUFSIZE);
WiredHome 83:7bad0068cca0 270 InsertionSort(xbuf, TPBUFSIZE);
WiredHome 83:7bad0068cca0 271 #else
WiredHome 78:faf49c381591 272 // Sort the Y buffer using an Insertion Sort
WiredHome 78:faf49c381591 273 for(i = 1; i <= TPBUFSIZE; i++) {
WiredHome 78:faf49c381591 274 temp = ybuf[i];
WiredHome 78:faf49c381591 275 j = i;
WiredHome 78:faf49c381591 276 while( j && (ybuf[j-1] > temp) ) {
WiredHome 78:faf49c381591 277 ybuf[j] = ybuf[j-1];
WiredHome 78:faf49c381591 278 j = j-1;
WiredHome 78:faf49c381591 279 }
WiredHome 78:faf49c381591 280 ybuf[j] = temp;
WiredHome 78:faf49c381591 281 } // End of Y sort
WiredHome 78:faf49c381591 282 // Sort the X buffer the same way
WiredHome 78:faf49c381591 283 for(i = 1; i <= TPBUFSIZE; i++) {
WiredHome 78:faf49c381591 284 temp = xbuf[i];
WiredHome 78:faf49c381591 285 j = i;
WiredHome 78:faf49c381591 286 while( j && (xbuf[j-1] > temp) ) {
WiredHome 78:faf49c381591 287 xbuf[j] = xbuf[j-1];
WiredHome 78:faf49c381591 288 j = j-1;
WiredHome 78:faf49c381591 289 }
WiredHome 78:faf49c381591 290 xbuf[j] = temp;
WiredHome 78:faf49c381591 291 } // End of X sort
WiredHome 83:7bad0068cca0 292 #endif
WiredHome 78:faf49c381591 293 // Average the middle half of the Y values and report them
WiredHome 78:faf49c381591 294 j = 0;
WiredHome 78:faf49c381591 295 for(i = (TPBUFSIZE/4) - 1; i < TPBUFSIZE - TPBUFSIZE/4; i++ ) {
WiredHome 78:faf49c381591 296 j += ybuf[i];
WiredHome 78:faf49c381591 297 }
WiredHome 83:7bad0068cca0 298 *y = lastY = j * (float)2/TPBUFSIZE; // This is the average
WiredHome 78:faf49c381591 299 // Average the middle half of the X values and report them
WiredHome 78:faf49c381591 300 j = 0;
WiredHome 78:faf49c381591 301 for(i = (TPBUFSIZE/4) - 1; i < TPBUFSIZE - TPBUFSIZE/4; i++ ) {
WiredHome 78:faf49c381591 302 j += xbuf[i];
WiredHome 78:faf49c381591 303 }
WiredHome 83:7bad0068cca0 304 *x = lastX = j * (float)2/TPBUFSIZE; // This is the average
WiredHome 78:faf49c381591 305 // Tidy up and return
WiredHome 83:7bad0068cca0 306 if (touchState == touch || touchState == held)
WiredHome 83:7bad0068cca0 307 touchState = held;
WiredHome 83:7bad0068cca0 308 else
WiredHome 83:7bad0068cca0 309 touchState = touch;
WiredHome 83:7bad0068cca0 310 ret = touchState;
WiredHome 83:7bad0068cca0 311 touchSample = 0; // Ready to start on the next set of data samples
WiredHome 78:faf49c381591 312 } else {
WiredHome 78:faf49c381591 313 // Buffer not yet full, so do not return any results yet
WiredHome 83:7bad0068cca0 314 if (touchState == touch || touchState == held) {
WiredHome 83:7bad0068cca0 315 *x = lastX;
WiredHome 83:7bad0068cca0 316 *y = lastY;
WiredHome 83:7bad0068cca0 317 ret = touchState = held;
WiredHome 83:7bad0068cca0 318 }
WiredHome 78:faf49c381591 319 }
WiredHome 78:faf49c381591 320 WriteCommand(INTC2, RA8875_INT_TP); // reg INTC2: Clear that TP interrupt flag
WiredHome 78:faf49c381591 321 } // End of initial if -- data has been read and processed
WiredHome 83:7bad0068cca0 322 else {
WiredHome 83:7bad0068cca0 323 if (touchState == touch || touchState == held) {
WiredHome 83:7bad0068cca0 324 *x = lastX;
WiredHome 83:7bad0068cca0 325 *y = lastY;
WiredHome 83:7bad0068cca0 326 ret = touchState = held;
WiredHome 83:7bad0068cca0 327 } else if (touchState == release) {
WiredHome 83:7bad0068cca0 328 *x = lastX;
WiredHome 83:7bad0068cca0 329 *y = lastY;
WiredHome 83:7bad0068cca0 330 ret = release;
WiredHome 83:7bad0068cca0 331 touchState = no_touch;
WiredHome 83:7bad0068cca0 332 }
WiredHome 83:7bad0068cca0 333 }
WiredHome 83:7bad0068cca0 334 return ret;
WiredHome 78:faf49c381591 335 }
WiredHome 78:faf49c381591 336
WiredHome 78:faf49c381591 337 /* The following section is derived from Carlos E. Vidales.
WiredHome 78:faf49c381591 338 *
WiredHome 78:faf49c381591 339 * Copyright (c) 2001, Carlos E. Vidales. All rights reserved.
WiredHome 78:faf49c381591 340 *
WiredHome 78:faf49c381591 341 * This sample program was written and put in the public domain
WiredHome 78:faf49c381591 342 * by Carlos E. Vidales. The program is provided "as is"
WiredHome 78:faf49c381591 343 * without warranty of any kind, either expressed or implied.
WiredHome 78:faf49c381591 344 * If you choose to use the program within your own products
WiredHome 78:faf49c381591 345 * you do so at your own risk, and assume the responsibility
WiredHome 78:faf49c381591 346 * for servicing, repairing or correcting the program should
WiredHome 78:faf49c381591 347 * it prove defective in any manner.
WiredHome 78:faf49c381591 348 * You may copy and distribute the program's source code in any
WiredHome 78:faf49c381591 349 * medium, provided that you also include in each copy an
WiredHome 78:faf49c381591 350 * appropriate copyright notice and disclaimer of warranty.
WiredHome 78:faf49c381591 351 * You may also modify this program and distribute copies of
WiredHome 78:faf49c381591 352 * it provided that you include prominent notices stating
WiredHome 78:faf49c381591 353 * that you changed the file(s) and the date of any change,
WiredHome 78:faf49c381591 354 * and that you do not charge any royalties or licenses for
WiredHome 78:faf49c381591 355 * its use.
WiredHome 78:faf49c381591 356 *
WiredHome 78:faf49c381591 357 * This file contains functions that implement calculations
WiredHome 78:faf49c381591 358 * necessary to obtain calibration factors for a touch screen
WiredHome 78:faf49c381591 359 * that suffers from multiple distortion effects: namely,
WiredHome 78:faf49c381591 360 * translation, scaling and rotation.
WiredHome 78:faf49c381591 361 *
WiredHome 78:faf49c381591 362 * The following set of equations represent a valid display
WiredHome 78:faf49c381591 363 * point given a corresponding set of touch screen points:
WiredHome 78:faf49c381591 364 *
WiredHome 78:faf49c381591 365 * /- -\
WiredHome 78:faf49c381591 366 * /- -\ /- -\ | |
WiredHome 78:faf49c381591 367 * | | | | | Xs |
WiredHome 78:faf49c381591 368 * | Xd | | A B C | | |
WiredHome 78:faf49c381591 369 * | | = | | * | Ys |
WiredHome 78:faf49c381591 370 * | Yd | | D E F | | |
WiredHome 78:faf49c381591 371 * | | | | | 1 |
WiredHome 78:faf49c381591 372 * \- -/ \- -/ | |
WiredHome 78:faf49c381591 373 * \- -/
WiredHome 78:faf49c381591 374 * where:
WiredHome 78:faf49c381591 375 * (Xd,Yd) represents the desired display point
WiredHome 78:faf49c381591 376 * coordinates,
WiredHome 78:faf49c381591 377 * (Xs,Ys) represents the available touch screen
WiredHome 78:faf49c381591 378 * coordinates, and the matrix
WiredHome 78:faf49c381591 379 * /- -\
WiredHome 78:faf49c381591 380 * |A,B,C|
WiredHome 78:faf49c381591 381 * |D,E,F| represents the factors used to translate
WiredHome 78:faf49c381591 382 * \- -/ the available touch screen point values
WiredHome 78:faf49c381591 383 * into the corresponding display
WiredHome 78:faf49c381591 384 * coordinates.
WiredHome 78:faf49c381591 385 * Note that for practical considerations, the utilities
WiredHome 78:faf49c381591 386 * within this file do not use the matrix coefficients as
WiredHome 78:faf49c381591 387 * defined above, but instead use the following
WiredHome 78:faf49c381591 388 * equivalents, since floating point math is not used:
WiredHome 78:faf49c381591 389 * A = An/Divider
WiredHome 78:faf49c381591 390 * B = Bn/Divider
WiredHome 78:faf49c381591 391 * C = Cn/Divider
WiredHome 78:faf49c381591 392 * D = Dn/Divider
WiredHome 78:faf49c381591 393 * E = En/Divider
WiredHome 78:faf49c381591 394 * F = Fn/Divider
WiredHome 78:faf49c381591 395 * The functions provided within this file are:
WiredHome 78:faf49c381591 396 * setCalibrationMatrix() - calculates the set of factors
WiredHome 78:faf49c381591 397 * in the above equation, given
WiredHome 78:faf49c381591 398 * three sets of test points.
WiredHome 78:faf49c381591 399 * getDisplayPoint() - returns the actual display
WiredHome 78:faf49c381591 400 * coordinates, given a set of
WiredHome 78:faf49c381591 401 * touch screen coordinates.
WiredHome 78:faf49c381591 402 * translateRawScreenCoordinates() - helper function to transform
WiredHome 78:faf49c381591 403 * raw screen points into values
WiredHome 78:faf49c381591 404 * scaled to the desired display
WiredHome 78:faf49c381591 405 * resolution.
WiredHome 78:faf49c381591 406 */
WiredHome 78:faf49c381591 407
WiredHome 78:faf49c381591 408 /**********************************************************************
WiredHome 78:faf49c381591 409 *
WiredHome 78:faf49c381591 410 * Function: setCalibrationMatrix()
WiredHome 78:faf49c381591 411 *
WiredHome 78:faf49c381591 412 * Description: Calling this function with valid input data
WiredHome 78:faf49c381591 413 * in the display and screen input arguments
WiredHome 78:faf49c381591 414 * causes the calibration factors between the
WiredHome 78:faf49c381591 415 * screen and display points to be calculated,
WiredHome 78:faf49c381591 416 * and the output argument - matrixPtr - to be
WiredHome 78:faf49c381591 417 * populated.
WiredHome 78:faf49c381591 418 *
WiredHome 78:faf49c381591 419 * This function needs to be called only when new
WiredHome 78:faf49c381591 420 * calibration factors are desired.
WiredHome 78:faf49c381591 421 *
WiredHome 78:faf49c381591 422 *
WiredHome 78:faf49c381591 423 * Argument(s): displayPtr (input) - Pointer to an array of three
WiredHome 78:faf49c381591 424 * sample, reference points.
WiredHome 78:faf49c381591 425 * screenPtr (input) - Pointer to the array of touch
WiredHome 78:faf49c381591 426 * screen points corresponding
WiredHome 78:faf49c381591 427 * to the reference display points.
WiredHome 78:faf49c381591 428 * matrixPtr (output) - Pointer to the calibration
WiredHome 78:faf49c381591 429 * matrix computed for the set
WiredHome 78:faf49c381591 430 * of points being provided.
WiredHome 78:faf49c381591 431 *
WiredHome 78:faf49c381591 432 *
WiredHome 78:faf49c381591 433 * From the article text, recall that the matrix coefficients are
WiredHome 78:faf49c381591 434 * resolved to be the following:
WiredHome 78:faf49c381591 435 *
WiredHome 78:faf49c381591 436 *
WiredHome 78:faf49c381591 437 * Divider = (Xs0 - Xs2)*(Ys1 - Ys2) - (Xs1 - Xs2)*(Ys0 - Ys2)
WiredHome 78:faf49c381591 438 *
WiredHome 78:faf49c381591 439 *
WiredHome 78:faf49c381591 440 *
WiredHome 78:faf49c381591 441 * (Xd0 - Xd2)*(Ys1 - Ys2) - (Xd1 - Xd2)*(Ys0 - Ys2)
WiredHome 78:faf49c381591 442 * A = ---------------------------------------------------
WiredHome 78:faf49c381591 443 * Divider
WiredHome 78:faf49c381591 444 *
WiredHome 78:faf49c381591 445 *
WiredHome 78:faf49c381591 446 * (Xs0 - Xs2)*(Xd1 - Xd2) - (Xd0 - Xd2)*(Xs1 - Xs2)
WiredHome 78:faf49c381591 447 * B = ---------------------------------------------------
WiredHome 78:faf49c381591 448 * Divider
WiredHome 78:faf49c381591 449 *
WiredHome 78:faf49c381591 450 *
WiredHome 78:faf49c381591 451 * Ys0*(Xs2*Xd1 - Xs1*Xd2) +
WiredHome 78:faf49c381591 452 * Ys1*(Xs0*Xd2 - Xs2*Xd0) +
WiredHome 78:faf49c381591 453 * Ys2*(Xs1*Xd0 - Xs0*Xd1)
WiredHome 78:faf49c381591 454 * C = ---------------------------------------------------
WiredHome 78:faf49c381591 455 * Divider
WiredHome 78:faf49c381591 456 *
WiredHome 78:faf49c381591 457 *
WiredHome 78:faf49c381591 458 * (Yd0 - Yd2)*(Ys1 - Ys2) - (Yd1 - Yd2)*(Ys0 - Ys2)
WiredHome 78:faf49c381591 459 * D = ---------------------------------------------------
WiredHome 78:faf49c381591 460 * Divider
WiredHome 78:faf49c381591 461 *
WiredHome 78:faf49c381591 462 *
WiredHome 78:faf49c381591 463 * (Xs0 - Xs2)*(Yd1 - Yd2) - (Yd0 - Yd2)*(Xs1 - Xs2)
WiredHome 78:faf49c381591 464 * E = ---------------------------------------------------
WiredHome 78:faf49c381591 465 * Divider
WiredHome 78:faf49c381591 466 *
WiredHome 78:faf49c381591 467 *
WiredHome 78:faf49c381591 468 * Ys0*(Xs2*Yd1 - Xs1*Yd2) +
WiredHome 78:faf49c381591 469 * Ys1*(Xs0*Yd2 - Xs2*Yd0) +
WiredHome 78:faf49c381591 470 * Ys2*(Xs1*Yd0 - Xs0*Yd1)
WiredHome 78:faf49c381591 471 * F = ---------------------------------------------------
WiredHome 78:faf49c381591 472 * Divider
WiredHome 78:faf49c381591 473 *
WiredHome 78:faf49c381591 474 *
WiredHome 78:faf49c381591 475 * Return: OK - the calibration matrix was correctly
WiredHome 78:faf49c381591 476 * calculated and its value is in the
WiredHome 78:faf49c381591 477 * output argument.
WiredHome 78:faf49c381591 478 * NOT_OK - an error was detected and the
WiredHome 78:faf49c381591 479 * function failed to return a valid
WiredHome 78:faf49c381591 480 * set of matrix values.
WiredHome 78:faf49c381591 481 * The only time this sample code returns
WiredHome 78:faf49c381591 482 * NOT_OK is when Divider == 0
WiredHome 78:faf49c381591 483 *
WiredHome 78:faf49c381591 484 *
WiredHome 78:faf49c381591 485 *
WiredHome 78:faf49c381591 486 * NOTE! NOTE! NOTE!
WiredHome 78:faf49c381591 487 *
WiredHome 78:faf49c381591 488 * setCalibrationMatrix() and getDisplayPoint() will do fine
WiredHome 78:faf49c381591 489 * for you as they are, provided that your digitizer
WiredHome 78:faf49c381591 490 * resolution does not exceed 10 bits (1024 values). Higher
WiredHome 78:faf49c381591 491 * resolutions may cause the integer operations to overflow
WiredHome 78:faf49c381591 492 * and return incorrect values. If you wish to use these
WiredHome 78:faf49c381591 493 * functions with digitizer resolutions of 12 bits (4096
WiredHome 78:faf49c381591 494 * values) you will either have to a) use 64-bit signed
WiredHome 78:faf49c381591 495 * integer variables and math, or b) judiciously modify the
WiredHome 78:faf49c381591 496 * operations to scale results by a factor of 2 or even 4.
WiredHome 78:faf49c381591 497 *
WiredHome 78:faf49c381591 498 */
WiredHome 81:01da2e34283d 499 RetCode_t RA8875::TouchPanelComputeCalibration(point_t * displayPtr, point_t * screenPtr, tpMatrix_t * matrixPtr)
WiredHome 78:faf49c381591 500 {
WiredHome 78:faf49c381591 501 RetCode_t retValue = noerror;
WiredHome 78:faf49c381591 502
WiredHome 78:faf49c381591 503 tpMatrix.Divider = ((screenPtr[0].x - screenPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) -
WiredHome 78:faf49c381591 504 ((screenPtr[1].x - screenPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ;
WiredHome 78:faf49c381591 505
WiredHome 78:faf49c381591 506 if( tpMatrix.Divider == 0 ) {
WiredHome 78:faf49c381591 507 retValue = bad_parameter;
WiredHome 78:faf49c381591 508 } else {
WiredHome 78:faf49c381591 509 tpMatrix.An = ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) -
WiredHome 78:faf49c381591 510 ((displayPtr[1].x - displayPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ;
WiredHome 78:faf49c381591 511
WiredHome 78:faf49c381591 512 tpMatrix.Bn = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].x - displayPtr[2].x)) -
WiredHome 78:faf49c381591 513 ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].x - screenPtr[2].x)) ;
WiredHome 78:faf49c381591 514
WiredHome 78:faf49c381591 515 tpMatrix.Cn = (screenPtr[2].x * displayPtr[1].x - screenPtr[1].x * displayPtr[2].x) * screenPtr[0].y +
WiredHome 78:faf49c381591 516 (screenPtr[0].x * displayPtr[2].x - screenPtr[2].x * displayPtr[0].x) * screenPtr[1].y +
WiredHome 78:faf49c381591 517 (screenPtr[1].x * displayPtr[0].x - screenPtr[0].x * displayPtr[1].x) * screenPtr[2].y ;
WiredHome 78:faf49c381591 518
WiredHome 78:faf49c381591 519 tpMatrix.Dn = ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].y - screenPtr[2].y)) -
WiredHome 78:faf49c381591 520 ((displayPtr[1].y - displayPtr[2].y) * (screenPtr[0].y - screenPtr[2].y)) ;
WiredHome 78:faf49c381591 521
WiredHome 78:faf49c381591 522 tpMatrix.En = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].y - displayPtr[2].y)) -
WiredHome 78:faf49c381591 523 ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].x - screenPtr[2].x)) ;
WiredHome 78:faf49c381591 524
WiredHome 78:faf49c381591 525 tpMatrix.Fn = (screenPtr[2].x * displayPtr[1].y - screenPtr[1].x * displayPtr[2].y) * screenPtr[0].y +
WiredHome 78:faf49c381591 526 (screenPtr[0].x * displayPtr[2].y - screenPtr[2].x * displayPtr[0].y) * screenPtr[1].y +
WiredHome 78:faf49c381591 527 (screenPtr[1].x * displayPtr[0].y - screenPtr[0].x * displayPtr[1].y) * screenPtr[2].y ;
WiredHome 83:7bad0068cca0 528 touchState = no_touch;
WiredHome 78:faf49c381591 529 if (matrixPtr)
WiredHome 78:faf49c381591 530 memcpy(matrixPtr, &tpMatrix, sizeof(tpMatrix_t));
WiredHome 78:faf49c381591 531 }
WiredHome 78:faf49c381591 532 return( retValue ) ;
WiredHome 78:faf49c381591 533 }
WiredHome 78:faf49c381591 534
WiredHome 78:faf49c381591 535 // #### end of touch panel code additions