EmbeddedArtists AB / Mbed 2 deprecated lpc4088_ebb_gui_cube

Graphical demo for the LPC4088 Experiment Base Board with one of the Display Expansion Kits. This demo shows a rotating 3D cube with and without textures.

Dependencies:   EALib mbed

AR1021I2C.cpp@0:c828045bbe69, 2014-10-03 (annotated)

Committer:
embeddedartists
Date:
Fri Oct 03 12:48:37 2014 +0000
Revision:
0:c828045bbe69
First version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:c828045bbe69 1 /*
embeddedartists 0:c828045bbe69 2 * Copyright 2013 Embedded Artists AB
embeddedartists 0:c828045bbe69 3 *
embeddedartists 0:c828045bbe69 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 0:c828045bbe69 5 * you may not use this file except in compliance with the License.
embeddedartists 0:c828045bbe69 6 * You may obtain a copy of the License at
embeddedartists 0:c828045bbe69 7 *
embeddedartists 0:c828045bbe69 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 0:c828045bbe69 9 *
embeddedartists 0:c828045bbe69 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 0:c828045bbe69 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 0:c828045bbe69 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 0:c828045bbe69 13 * See the License for the specific language governing permissions and
embeddedartists 0:c828045bbe69 14 * limitations under the License.
embeddedartists 0:c828045bbe69 15 */
embeddedartists 0:c828045bbe69 16
embeddedartists 0:c828045bbe69 17 /******************************************************************************
embeddedartists 0:c828045bbe69 18 * Includes
embeddedartists 0:c828045bbe69 19 *****************************************************************************/
embeddedartists 0:c828045bbe69 20
embeddedartists 0:c828045bbe69 21 #include "mbed.h"
embeddedartists 0:c828045bbe69 22 #include "mbed_debug.h"
embeddedartists 0:c828045bbe69 23
embeddedartists 0:c828045bbe69 24 #include "AR1021I2C.h"
embeddedartists 0:c828045bbe69 25
embeddedartists 0:c828045bbe69 26 /******************************************************************************
embeddedartists 0:c828045bbe69 27 * Defines and typedefs
embeddedartists 0:c828045bbe69 28 *****************************************************************************/
embeddedartists 0:c828045bbe69 29
embeddedartists 0:c828045bbe69 30 #define AR1021_REG_TOUCH_THRESHOLD (0x02)
embeddedartists 0:c828045bbe69 31 #define AR1021_REG_SENS_FILTER (0x03)
embeddedartists 0:c828045bbe69 32 #define AR1021_REG_SAMPLING_FAST (0x04)
embeddedartists 0:c828045bbe69 33 #define AR1021_REG_SAMPLING_SLOW (0x05)
embeddedartists 0:c828045bbe69 34 #define AR1021_REG_ACC_FILTER_FAST (0x06)
embeddedartists 0:c828045bbe69 35 #define AR1021_REG_ACC_FILTER_SLOW (0x07)
embeddedartists 0:c828045bbe69 36 #define AR1021_REG_SPEED_THRESHOLD (0x08)
embeddedartists 0:c828045bbe69 37 #define AR1021_REG_SLEEP_DELAY (0x0A)
embeddedartists 0:c828045bbe69 38 #define AR1021_REG_PEN_UP_DELAY (0x0B)
embeddedartists 0:c828045bbe69 39 #define AR1021_REG_TOUCH_MODE (0x0C)
embeddedartists 0:c828045bbe69 40 #define AR1021_REG_TOUCH_OPTIONS (0x0D)
embeddedartists 0:c828045bbe69 41 #define AR1021_REG_CALIB_INSETS (0x0E)
embeddedartists 0:c828045bbe69 42 #define AR1021_REG_PEN_STATE_REPORT_DELAY (0x0F)
embeddedartists 0:c828045bbe69 43 #define AR1021_REG_TOUCH_REPORT_DELAY (0x11)
embeddedartists 0:c828045bbe69 44
embeddedartists 0:c828045bbe69 45
embeddedartists 0:c828045bbe69 46 #define AR1021_CMD_GET_VERSION (0x10)
embeddedartists 0:c828045bbe69 47 #define AR1021_CMD_ENABLE_TOUCH (0x12)
embeddedartists 0:c828045bbe69 48 #define AR1021_CMD_DISABLE_TOUCH (0x13)
embeddedartists 0:c828045bbe69 49 #define AR1021_CMD_CALIBRATE_MODE (0x14)
embeddedartists 0:c828045bbe69 50 #define AR1021_CMD_REGISTER_READ (0x20)
embeddedartists 0:c828045bbe69 51 #define AR1021_CMD_REGISTER_WRITE (0x21)
embeddedartists 0:c828045bbe69 52 #define AR1021_CMD_REGISTER_START_ADDR_REQUEST (0x22)
embeddedartists 0:c828045bbe69 53 #define AR1021_CMD_REGISTER_WRITE_TO_EEPROM (0x23)
embeddedartists 0:c828045bbe69 54 #define AR1021_CMD_EEPROM_READ (0x28)
embeddedartists 0:c828045bbe69 55 #define AR1021_CMD_EEPROM_WRITE (0x29)
embeddedartists 0:c828045bbe69 56 #define AR1021_CMD_EEPROM_WRITE_TO_REGISTERS (0x2B)
embeddedartists 0:c828045bbe69 57
embeddedartists 0:c828045bbe69 58 #define AR1021_RESP_STAT_OK (0x00)
embeddedartists 0:c828045bbe69 59 #define AR1021_RESP_STAT_CMD_UNREC (0x01)
embeddedartists 0:c828045bbe69 60 #define AR1021_RESP_STAT_HDR_UNREC (0x03)
embeddedartists 0:c828045bbe69 61 #define AR1021_RESP_STAT_TIMEOUT (0x04)
embeddedartists 0:c828045bbe69 62 #define AR1021_RESP_STAT_CANCEL_CALIB (0xFC)
embeddedartists 0:c828045bbe69 63
embeddedartists 0:c828045bbe69 64
embeddedartists 0:c828045bbe69 65 #define AR1021_ERR_NO_HDR (-1000)
embeddedartists 0:c828045bbe69 66 #define AR1021_ERR_INV_LEN (-1001)
embeddedartists 0:c828045bbe69 67 #define AR1021_ERR_INV_RESP (-1002)
embeddedartists 0:c828045bbe69 68 #define AR1021_ERR_INV_RESPLEN (-1003)
embeddedartists 0:c828045bbe69 69 #define AR1021_ERR_TIMEOUT (-1004)
embeddedartists 0:c828045bbe69 70
embeddedartists 0:c828045bbe69 71 // bit 7 is always 1 and bit 0 defines pen up or down
embeddedartists 0:c828045bbe69 72 #define AR1021_PEN_MASK (0x81)
embeddedartists 0:c828045bbe69 73
embeddedartists 0:c828045bbe69 74 #define AR1021_NUM_CALIB_POINTS (4)
embeddedartists 0:c828045bbe69 75
embeddedartists 0:c828045bbe69 76 #define AR1021_ADDR (0x4D << 1)
embeddedartists 0:c828045bbe69 77
embeddedartists 0:c828045bbe69 78 #define AR1021_TIMEOUT 1000 //how many ms to wait for responce
embeddedartists 0:c828045bbe69 79 #define AR1021_RETRY 5 //how many times to retry sending command
embeddedartists 0:c828045bbe69 80
embeddedartists 0:c828045bbe69 81 #define AR1021_MIN(__a, __b) (((__a)<(__b))?(__a):(__b))
embeddedartists 0:c828045bbe69 82
embeddedartists 0:c828045bbe69 83
embeddedartists 0:c828045bbe69 84 AR1021I2C::AR1021I2C(PinName sda, PinName scl, PinName siq) :
embeddedartists 0:c828045bbe69 85 _i2c(sda, scl), _siq(siq), _siqIrq(siq)
embeddedartists 0:c828045bbe69 86 {
embeddedartists 0:c828045bbe69 87 _i2c.frequency(200000);
embeddedartists 0:c828045bbe69 88
embeddedartists 0:c828045bbe69 89 // default calibration inset is 25 -> (25/2 = 12.5%)
embeddedartists 0:c828045bbe69 90 _inset = 25;
embeddedartists 0:c828045bbe69 91
embeddedartists 0:c828045bbe69 92 // make sure _calibPoint has an invalid value to begin with
embeddedartists 0:c828045bbe69 93 // correct value is set in calibrateStart()
embeddedartists 0:c828045bbe69 94 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:c828045bbe69 95
embeddedartists 0:c828045bbe69 96 _x = 0;
embeddedartists 0:c828045bbe69 97 _y = 0;
embeddedartists 0:c828045bbe69 98 _pen = 0;
embeddedartists 0:c828045bbe69 99
embeddedartists 0:c828045bbe69 100 _initialized = false;
embeddedartists 0:c828045bbe69 101 }
embeddedartists 0:c828045bbe69 102
embeddedartists 0:c828045bbe69 103
embeddedartists 0:c828045bbe69 104 bool AR1021I2C::read(touchCoordinate_t &coord) {
embeddedartists 0:c828045bbe69 105
embeddedartists 0:c828045bbe69 106 if (!_initialized) return false;
embeddedartists 0:c828045bbe69 107
embeddedartists 0:c828045bbe69 108 coord.x = _x * _width/4095;
embeddedartists 0:c828045bbe69 109 coord.y = _y * _height/4095;
embeddedartists 0:c828045bbe69 110 coord.z = _pen;
embeddedartists 0:c828045bbe69 111
embeddedartists 0:c828045bbe69 112 return true;
embeddedartists 0:c828045bbe69 113 }
embeddedartists 0:c828045bbe69 114
embeddedartists 0:c828045bbe69 115
embeddedartists 0:c828045bbe69 116 bool AR1021I2C::init(uint16_t width, uint16_t height) {
embeddedartists 0:c828045bbe69 117 int result = 0;
embeddedartists 0:c828045bbe69 118 bool ok = false;
embeddedartists 0:c828045bbe69 119 int attempts = 0;
embeddedartists 0:c828045bbe69 120
embeddedartists 0:c828045bbe69 121 _width = width;
embeddedartists 0:c828045bbe69 122 _height = height;
embeddedartists 0:c828045bbe69 123
embeddedartists 0:c828045bbe69 124 while (1) {
embeddedartists 0:c828045bbe69 125
embeddedartists 0:c828045bbe69 126 do {
embeddedartists 0:c828045bbe69 127 // disable touch
embeddedartists 0:c828045bbe69 128 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:c828045bbe69 129 if (result != 0) {
embeddedartists 0:c828045bbe69 130 debug("disable touch failed (%d)\n", result);
embeddedartists 0:c828045bbe69 131 break;
embeddedartists 0:c828045bbe69 132 }
embeddedartists 0:c828045bbe69 133
embeddedartists 0:c828045bbe69 134 char regOffset = 0;
embeddedartists 0:c828045bbe69 135 int regOffLen = 1;
embeddedartists 0:c828045bbe69 136 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:c828045bbe69 137 &regOffset, &regOffLen);
embeddedartists 0:c828045bbe69 138 if (result != 0) {
embeddedartists 0:c828045bbe69 139 debug("register offset request failed (%d)\n", result);
embeddedartists 0:c828045bbe69 140 break;
embeddedartists 0:c828045bbe69 141 }
embeddedartists 0:c828045bbe69 142
embeddedartists 0:c828045bbe69 143 // enable calibrated coordinates
embeddedartists 0:c828045bbe69 144 // high, low address, len, value
embeddedartists 0:c828045bbe69 145 char toptions[4] = {0x00, AR1021_REG_TOUCH_OPTIONS+regOffset, 0x01, 0x01};
embeddedartists 0:c828045bbe69 146 result = cmd(AR1021_CMD_REGISTER_WRITE, toptions, 4, NULL, 0);
embeddedartists 0:c828045bbe69 147 if (result != 0) {
embeddedartists 0:c828045bbe69 148 debug("register write request failed (%d)\n", result);
embeddedartists 0:c828045bbe69 149 break;
embeddedartists 0:c828045bbe69 150 }
embeddedartists 0:c828045bbe69 151
embeddedartists 0:c828045bbe69 152 // save registers to eeprom
embeddedartists 0:c828045bbe69 153 result = cmd(AR1021_CMD_REGISTER_WRITE_TO_EEPROM, NULL, 0, NULL, 0);
embeddedartists 0:c828045bbe69 154 if (result != 0) {
embeddedartists 0:c828045bbe69 155 debug("register write to eeprom failed (%d)\n", result);
embeddedartists 0:c828045bbe69 156 break;
embeddedartists 0:c828045bbe69 157 }
embeddedartists 0:c828045bbe69 158
embeddedartists 0:c828045bbe69 159 // enable touch
embeddedartists 0:c828045bbe69 160 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:c828045bbe69 161 if (result != 0) {
embeddedartists 0:c828045bbe69 162 debug("enable touch failed (%d)\n", result);
embeddedartists 0:c828045bbe69 163 break;
embeddedartists 0:c828045bbe69 164 }
embeddedartists 0:c828045bbe69 165
embeddedartists 0:c828045bbe69 166 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:c828045bbe69 167
embeddedartists 0:c828045bbe69 168 _initialized = true;
embeddedartists 0:c828045bbe69 169 ok = true;
embeddedartists 0:c828045bbe69 170
embeddedartists 0:c828045bbe69 171 } while(0);
embeddedartists 0:c828045bbe69 172
embeddedartists 0:c828045bbe69 173 if (ok) break;
embeddedartists 0:c828045bbe69 174
embeddedartists 0:c828045bbe69 175 // try to run the initialize sequence at most 2 times
embeddedartists 0:c828045bbe69 176 if(++attempts >= 2) break;
embeddedartists 0:c828045bbe69 177 }
embeddedartists 0:c828045bbe69 178
embeddedartists 0:c828045bbe69 179
embeddedartists 0:c828045bbe69 180 return ok;
embeddedartists 0:c828045bbe69 181 }
embeddedartists 0:c828045bbe69 182
embeddedartists 0:c828045bbe69 183 bool AR1021I2C::calibrateStart() {
embeddedartists 0:c828045bbe69 184 bool ok = false;
embeddedartists 0:c828045bbe69 185 int result = 0;
embeddedartists 0:c828045bbe69 186 int attempts = 0;
embeddedartists 0:c828045bbe69 187
embeddedartists 0:c828045bbe69 188 if (!_initialized) return false;
embeddedartists 0:c828045bbe69 189
embeddedartists 0:c828045bbe69 190 _siqIrq.rise(NULL);
embeddedartists 0:c828045bbe69 191
embeddedartists 0:c828045bbe69 192 while(1) {
embeddedartists 0:c828045bbe69 193
embeddedartists 0:c828045bbe69 194 do {
embeddedartists 0:c828045bbe69 195 // disable touch
embeddedartists 0:c828045bbe69 196 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:c828045bbe69 197 if (result != 0) {
embeddedartists 0:c828045bbe69 198 debug("disable touch failed (%d)\n", result);
embeddedartists 0:c828045bbe69 199 break;
embeddedartists 0:c828045bbe69 200 }
embeddedartists 0:c828045bbe69 201
embeddedartists 0:c828045bbe69 202 char regOffset = 0;
embeddedartists 0:c828045bbe69 203 int regOffLen = 1;
embeddedartists 0:c828045bbe69 204 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:c828045bbe69 205 &regOffset, &regOffLen);
embeddedartists 0:c828045bbe69 206 if (result != 0) {
embeddedartists 0:c828045bbe69 207 debug("register offset request failed (%d)\n", result);
embeddedartists 0:c828045bbe69 208 break;
embeddedartists 0:c828045bbe69 209 }
embeddedartists 0:c828045bbe69 210
embeddedartists 0:c828045bbe69 211 // set insets
embeddedartists 0:c828045bbe69 212 // enable calibrated coordinates
embeddedartists 0:c828045bbe69 213 // high, low address, len, value
embeddedartists 0:c828045bbe69 214 char insets[4] = {0x00, AR1021_REG_CALIB_INSETS+regOffset, 0x01, _inset};
embeddedartists 0:c828045bbe69 215 result = cmd(AR1021_CMD_REGISTER_WRITE, insets, 4, NULL, 0);
embeddedartists 0:c828045bbe69 216 if (result != 0) {
embeddedartists 0:c828045bbe69 217 debug("register write request failed (%d)\n", result);
embeddedartists 0:c828045bbe69 218 break;
embeddedartists 0:c828045bbe69 219 }
embeddedartists 0:c828045bbe69 220
embeddedartists 0:c828045bbe69 221 // calibration mode
embeddedartists 0:c828045bbe69 222 char calibType = 4;
embeddedartists 0:c828045bbe69 223 result = cmd(AR1021_CMD_CALIBRATE_MODE, &calibType, 1, NULL, 0, false);
embeddedartists 0:c828045bbe69 224 if (result != 0) {
embeddedartists 0:c828045bbe69 225 debug("calibration mode failed (%d)\n", result);
embeddedartists 0:c828045bbe69 226 break;
embeddedartists 0:c828045bbe69 227 }
embeddedartists 0:c828045bbe69 228
embeddedartists 0:c828045bbe69 229 _calibPoint = 0;
embeddedartists 0:c828045bbe69 230 ok = true;
embeddedartists 0:c828045bbe69 231
embeddedartists 0:c828045bbe69 232 } while(0);
embeddedartists 0:c828045bbe69 233
embeddedartists 0:c828045bbe69 234 if (ok) break;
embeddedartists 0:c828045bbe69 235
embeddedartists 0:c828045bbe69 236 // try to run the calibrate mode sequence at most 2 times
embeddedartists 0:c828045bbe69 237 if (++attempts >= 2) break;
embeddedartists 0:c828045bbe69 238 }
embeddedartists 0:c828045bbe69 239
embeddedartists 0:c828045bbe69 240 return ok;
embeddedartists 0:c828045bbe69 241 }
embeddedartists 0:c828045bbe69 242
embeddedartists 0:c828045bbe69 243 bool AR1021I2C::getNextCalibratePoint(uint16_t* x, uint16_t* y) {
embeddedartists 0:c828045bbe69 244
embeddedartists 0:c828045bbe69 245 if (!_initialized) return false;
embeddedartists 0:c828045bbe69 246 if (x == NULL || y == NULL) return false;
embeddedartists 0:c828045bbe69 247
embeddedartists 0:c828045bbe69 248 int xInset = (_width * _inset / 100) / 2;
embeddedartists 0:c828045bbe69 249 int yInset = (_height * _inset / 100) / 2;
embeddedartists 0:c828045bbe69 250
embeddedartists 0:c828045bbe69 251 switch(_calibPoint) {
embeddedartists 0:c828045bbe69 252 case 0:
embeddedartists 0:c828045bbe69 253 *x = xInset;
embeddedartists 0:c828045bbe69 254 *y = yInset;
embeddedartists 0:c828045bbe69 255 break;
embeddedartists 0:c828045bbe69 256 case 1:
embeddedartists 0:c828045bbe69 257 *x = _width - xInset;
embeddedartists 0:c828045bbe69 258 *y = yInset;
embeddedartists 0:c828045bbe69 259 break;
embeddedartists 0:c828045bbe69 260 case 2:
embeddedartists 0:c828045bbe69 261 *x = _width - xInset;
embeddedartists 0:c828045bbe69 262 *y = _height - yInset;
embeddedartists 0:c828045bbe69 263 break;
embeddedartists 0:c828045bbe69 264 case 3:
embeddedartists 0:c828045bbe69 265 *x = xInset;
embeddedartists 0:c828045bbe69 266 *y = _height - yInset;
embeddedartists 0:c828045bbe69 267 break;
embeddedartists 0:c828045bbe69 268 default:
embeddedartists 0:c828045bbe69 269 return false;
embeddedartists 0:c828045bbe69 270 }
embeddedartists 0:c828045bbe69 271
embeddedartists 0:c828045bbe69 272 return true;
embeddedartists 0:c828045bbe69 273 }
embeddedartists 0:c828045bbe69 274
embeddedartists 0:c828045bbe69 275 bool AR1021I2C::waitForCalibratePoint(bool* morePoints, uint32_t timeout) {
embeddedartists 0:c828045bbe69 276 int result = 0;
embeddedartists 0:c828045bbe69 277 bool ret = false;
embeddedartists 0:c828045bbe69 278
embeddedartists 0:c828045bbe69 279 if (!_initialized) return false;
embeddedartists 0:c828045bbe69 280
embeddedartists 0:c828045bbe69 281 do {
embeddedartists 0:c828045bbe69 282 if (morePoints == NULL || _calibPoint >= AR1021_NUM_CALIB_POINTS) {
embeddedartists 0:c828045bbe69 283 break;
embeddedartists 0:c828045bbe69 284 }
embeddedartists 0:c828045bbe69 285
embeddedartists 0:c828045bbe69 286 // wait for response
embeddedartists 0:c828045bbe69 287 result = waitForCalibResponse(timeout);
embeddedartists 0:c828045bbe69 288 if (result != 0) {
embeddedartists 0:c828045bbe69 289 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:c828045bbe69 290 break;
embeddedartists 0:c828045bbe69 291 }
embeddedartists 0:c828045bbe69 292
embeddedartists 0:c828045bbe69 293 _calibPoint++;
embeddedartists 0:c828045bbe69 294 *morePoints = (_calibPoint < AR1021_NUM_CALIB_POINTS);
embeddedartists 0:c828045bbe69 295
embeddedartists 0:c828045bbe69 296
embeddedartists 0:c828045bbe69 297 // no more points -> enable touch
embeddedartists 0:c828045bbe69 298 if (!(*morePoints)) {
embeddedartists 0:c828045bbe69 299
embeddedartists 0:c828045bbe69 300 // wait for calibration data to be written to eeprom
embeddedartists 0:c828045bbe69 301 // before enabling touch
embeddedartists 0:c828045bbe69 302 result = waitForCalibResponse(timeout);
embeddedartists 0:c828045bbe69 303 if (result != 0) {
embeddedartists 0:c828045bbe69 304 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:c828045bbe69 305 break;
embeddedartists 0:c828045bbe69 306 }
embeddedartists 0:c828045bbe69 307
embeddedartists 0:c828045bbe69 308
embeddedartists 0:c828045bbe69 309 // clear chip-select since calibration is done;
embeddedartists 0:c828045bbe69 310 // _cs = 1;
embeddedartists 0:c828045bbe69 311
embeddedartists 0:c828045bbe69 312 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:c828045bbe69 313 if (result != 0) {
embeddedartists 0:c828045bbe69 314 debug("enable touch failed (%d)\n", result);
embeddedartists 0:c828045bbe69 315 break;
embeddedartists 0:c828045bbe69 316 }
embeddedartists 0:c828045bbe69 317
embeddedartists 0:c828045bbe69 318 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:c828045bbe69 319 }
embeddedartists 0:c828045bbe69 320
embeddedartists 0:c828045bbe69 321 ret = true;
embeddedartists 0:c828045bbe69 322
embeddedartists 0:c828045bbe69 323 } while (0);
embeddedartists 0:c828045bbe69 324
embeddedartists 0:c828045bbe69 325
embeddedartists 0:c828045bbe69 326
embeddedartists 0:c828045bbe69 327 if (!ret) {
embeddedartists 0:c828045bbe69 328 // make sure to set chip-select off in case of an error
embeddedartists 0:c828045bbe69 329 // _cs = 1;
embeddedartists 0:c828045bbe69 330 // calibration must restart if an error occurred
embeddedartists 0:c828045bbe69 331 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:c828045bbe69 332 }
embeddedartists 0:c828045bbe69 333
embeddedartists 0:c828045bbe69 334
embeddedartists 0:c828045bbe69 335
embeddedartists 0:c828045bbe69 336 return ret;
embeddedartists 0:c828045bbe69 337 }
embeddedartists 0:c828045bbe69 338
embeddedartists 0:c828045bbe69 339 int AR1021I2C::cmd(char cmd, char* data, int len, char* respBuf, int* respLen,
embeddedartists 0:c828045bbe69 340 bool setCsOff) {
embeddedartists 0:c828045bbe69 341
embeddedartists 0:c828045bbe69 342 int ret = 0;
embeddedartists 0:c828045bbe69 343 int readLen = (respLen == NULL) ? 0 : *respLen;
embeddedartists 0:c828045bbe69 344 for (int attempt = 1; attempt <= AR1021_RETRY; attempt++) {
embeddedartists 0:c828045bbe69 345 if (attempt > 1) {
embeddedartists 0:c828045bbe69 346 wait_ms(50);
embeddedartists 0:c828045bbe69 347 }
embeddedartists 0:c828045bbe69 348
embeddedartists 0:c828045bbe69 349 // command request
embeddedartists 0:c828045bbe69 350 // ---------------
embeddedartists 0:c828045bbe69 351 // 0x00 0x55 len cmd data
embeddedartists 0:c828045bbe69 352 // 0x00 = protocol command byte
embeddedartists 0:c828045bbe69 353 // 0x55 = header
embeddedartists 0:c828045bbe69 354 // len = data length + cmd (1)
embeddedartists 0:c828045bbe69 355 // data = data to send
embeddedartists 0:c828045bbe69 356
embeddedartists 0:c828045bbe69 357 _i2c.start();
embeddedartists 0:c828045bbe69 358 _i2c.write(AR1021_ADDR); //send write address
embeddedartists 0:c828045bbe69 359 _i2c.write(0x00);
embeddedartists 0:c828045bbe69 360 _i2c.write(0x55); //header
embeddedartists 0:c828045bbe69 361 _i2c.write(len+1); //message length
embeddedartists 0:c828045bbe69 362 _i2c.write(cmd);
embeddedartists 0:c828045bbe69 363 for (int i = 0; i < len; i++) {
embeddedartists 0:c828045bbe69 364 _i2c.write(data[i]);
embeddedartists 0:c828045bbe69 365 }
embeddedartists 0:c828045bbe69 366 wait_us(60);
embeddedartists 0:c828045bbe69 367 _i2c.stop();
embeddedartists 0:c828045bbe69 368
embeddedartists 0:c828045bbe69 369 // wait for response (siq goes high when response is available)
embeddedartists 0:c828045bbe69 370 Timer t;
embeddedartists 0:c828045bbe69 371 t.start();
embeddedartists 0:c828045bbe69 372 while(_siq.read() != 1 && t.read_ms() < AR1021_TIMEOUT);
embeddedartists 0:c828045bbe69 373
embeddedartists 0:c828045bbe69 374 if (t.read_ms() < AR1021_TIMEOUT) {
embeddedartists 0:c828045bbe69 375
embeddedartists 0:c828045bbe69 376 // command response
embeddedartists 0:c828045bbe69 377 // ---------------
embeddedartists 0:c828045bbe69 378 // 0x55 len status cmd data
embeddedartists 0:c828045bbe69 379 // 0x55 = header
embeddedartists 0:c828045bbe69 380 // len = number of bytes following the len byte (i.e. including the status&cmd)
embeddedartists 0:c828045bbe69 381 // status = status
embeddedartists 0:c828045bbe69 382 // cmd = command ID
embeddedartists 0:c828045bbe69 383 // data = data to receive
embeddedartists 0:c828045bbe69 384 _i2c.start();
embeddedartists 0:c828045bbe69 385 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:c828045bbe69 386 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:c828045bbe69 387 if (header != 0x55) {
embeddedartists 0:c828045bbe69 388 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:c828045bbe69 389 continue;
embeddedartists 0:c828045bbe69 390 }
embeddedartists 0:c828045bbe69 391 char length = _i2c.read(1); //data length
embeddedartists 0:c828045bbe69 392 if (length < 2) {
embeddedartists 0:c828045bbe69 393 ret = AR1021_ERR_INV_LEN; //must have at least status and command bytes
embeddedartists 0:c828045bbe69 394 continue;
embeddedartists 0:c828045bbe69 395 }
embeddedartists 0:c828045bbe69 396 length -= 2;
embeddedartists 0:c828045bbe69 397 if (length > readLen) {
embeddedartists 0:c828045bbe69 398 ret = AR1021_ERR_INV_LEN; //supplied buffer is not enough
embeddedartists 0:c828045bbe69 399 continue;
embeddedartists 0:c828045bbe69 400 }
embeddedartists 0:c828045bbe69 401
embeddedartists 0:c828045bbe69 402 char status = _i2c.read(1); //command status
embeddedartists 0:c828045bbe69 403 char usedCmd;
embeddedartists 0:c828045bbe69 404 if (readLen <= 0) {
embeddedartists 0:c828045bbe69 405 usedCmd = _i2c.read(0); //no data => read command byte + NACK
embeddedartists 0:c828045bbe69 406 } else {
embeddedartists 0:c828045bbe69 407 usedCmd = _i2c.read(1); //which command
embeddedartists 0:c828045bbe69 408
embeddedartists 0:c828045bbe69 409 //we need to send a NACK on the last read.
embeddedartists 0:c828045bbe69 410 int i;
embeddedartists 0:c828045bbe69 411 for (i = 0; i < (length-1); i++) {
embeddedartists 0:c828045bbe69 412 respBuf[i] = _i2c.read(1);
embeddedartists 0:c828045bbe69 413 }
embeddedartists 0:c828045bbe69 414 respBuf[i] = _i2c.read(0); //last returned data byte + NACK
embeddedartists 0:c828045bbe69 415 }
embeddedartists 0:c828045bbe69 416 _i2c.stop();
embeddedartists 0:c828045bbe69 417
embeddedartists 0:c828045bbe69 418
embeddedartists 0:c828045bbe69 419 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:c828045bbe69 420 ret = -status;
embeddedartists 0:c828045bbe69 421 continue;
embeddedartists 0:c828045bbe69 422 }
embeddedartists 0:c828045bbe69 423 if (usedCmd != cmd) {
embeddedartists 0:c828045bbe69 424 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:c828045bbe69 425 continue;
embeddedartists 0:c828045bbe69 426 }
embeddedartists 0:c828045bbe69 427
embeddedartists 0:c828045bbe69 428 // success
embeddedartists 0:c828045bbe69 429 ret = 0;
embeddedartists 0:c828045bbe69 430 break;
embeddedartists 0:c828045bbe69 431
embeddedartists 0:c828045bbe69 432 } else {
embeddedartists 0:c828045bbe69 433 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:c828045bbe69 434 continue;
embeddedartists 0:c828045bbe69 435 }
embeddedartists 0:c828045bbe69 436 }
embeddedartists 0:c828045bbe69 437
embeddedartists 0:c828045bbe69 438 return ret;
embeddedartists 0:c828045bbe69 439 }
embeddedartists 0:c828045bbe69 440
embeddedartists 0:c828045bbe69 441 int AR1021I2C::waitForCalibResponse(uint32_t timeout) {
embeddedartists 0:c828045bbe69 442 Timer t;
embeddedartists 0:c828045bbe69 443 int ret = 0;
embeddedartists 0:c828045bbe69 444
embeddedartists 0:c828045bbe69 445 t.start();
embeddedartists 0:c828045bbe69 446
embeddedartists 0:c828045bbe69 447 // wait for siq
embeddedartists 0:c828045bbe69 448 while (_siq.read() != 1 &&
embeddedartists 0:c828045bbe69 449 (timeout == 0 || (uint32_t)t.read_ms() < (int)timeout));
embeddedartists 0:c828045bbe69 450
embeddedartists 0:c828045bbe69 451
embeddedartists 0:c828045bbe69 452 do {
embeddedartists 0:c828045bbe69 453
embeddedartists 0:c828045bbe69 454 if (timeout > 0 && (uint32_t)t.read_ms() >= timeout) {
embeddedartists 0:c828045bbe69 455 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:c828045bbe69 456 break;
embeddedartists 0:c828045bbe69 457 }
embeddedartists 0:c828045bbe69 458
embeddedartists 0:c828045bbe69 459 // command response
embeddedartists 0:c828045bbe69 460 // ---------------
embeddedartists 0:c828045bbe69 461 // 0x55 len status cmd data
embeddedartists 0:c828045bbe69 462 // 0x55 = header
embeddedartists 0:c828045bbe69 463 // len = number of bytes following the len byte (should be 2)
embeddedartists 0:c828045bbe69 464 // status = status
embeddedartists 0:c828045bbe69 465 // cmd = command ID
embeddedartists 0:c828045bbe69 466 _i2c.start();
embeddedartists 0:c828045bbe69 467 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:c828045bbe69 468 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:c828045bbe69 469 char length = _i2c.read(1); //data length
embeddedartists 0:c828045bbe69 470
embeddedartists 0:c828045bbe69 471 if (header != 0x55) {
embeddedartists 0:c828045bbe69 472 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:c828045bbe69 473 break;
embeddedartists 0:c828045bbe69 474 }
embeddedartists 0:c828045bbe69 475 if (length < 2) {
embeddedartists 0:c828045bbe69 476 ret = AR1021_ERR_INV_LEN;
embeddedartists 0:c828045bbe69 477 break;
embeddedartists 0:c828045bbe69 478 }
embeddedartists 0:c828045bbe69 479 char status = _i2c.read(1); //status
embeddedartists 0:c828045bbe69 480 char cmd = _i2c.read(0); //command, should be NACK'ed
embeddedartists 0:c828045bbe69 481 _i2c.stop();
embeddedartists 0:c828045bbe69 482 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:c828045bbe69 483 ret = -status;
embeddedartists 0:c828045bbe69 484 break;
embeddedartists 0:c828045bbe69 485 }
embeddedartists 0:c828045bbe69 486 if (cmd != AR1021_CMD_CALIBRATE_MODE) {
embeddedartists 0:c828045bbe69 487 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:c828045bbe69 488 break;
embeddedartists 0:c828045bbe69 489 }
embeddedartists 0:c828045bbe69 490
embeddedartists 0:c828045bbe69 491 // success
embeddedartists 0:c828045bbe69 492 ret = 0;
embeddedartists 0:c828045bbe69 493
embeddedartists 0:c828045bbe69 494 } while (0);
embeddedartists 0:c828045bbe69 495
embeddedartists 0:c828045bbe69 496 return ret;
embeddedartists 0:c828045bbe69 497 }
embeddedartists 0:c828045bbe69 498
embeddedartists 0:c828045bbe69 499
embeddedartists 0:c828045bbe69 500 void AR1021I2C::readTouchIrq() {
embeddedartists 0:c828045bbe69 501 while(_siq.read() == 1) {
embeddedartists 0:c828045bbe69 502
embeddedartists 0:c828045bbe69 503 // touch coordinates are sent in a 5-byte data packet
embeddedartists 0:c828045bbe69 504 _i2c.start();
embeddedartists 0:c828045bbe69 505 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:c828045bbe69 506 int pen = _i2c.read(1);
embeddedartists 0:c828045bbe69 507 int xlo = _i2c.read(1);
embeddedartists 0:c828045bbe69 508 int xhi = _i2c.read(1);
embeddedartists 0:c828045bbe69 509 int ylo = _i2c.read(1);
embeddedartists 0:c828045bbe69 510 int yhi = _i2c.read(0);
embeddedartists 0:c828045bbe69 511 _i2c.stop();
embeddedartists 0:c828045bbe69 512
embeddedartists 0:c828045bbe69 513 // pen down
embeddedartists 0:c828045bbe69 514 if ((pen&AR1021_PEN_MASK) == (1<<7|1<<0)) {
embeddedartists 0:c828045bbe69 515 _pen = 1;
embeddedartists 0:c828045bbe69 516 }
embeddedartists 0:c828045bbe69 517 // pen up
embeddedartists 0:c828045bbe69 518 else if ((pen&AR1021_PEN_MASK) == (1<<7)){
embeddedartists 0:c828045bbe69 519 _pen = 0;
embeddedartists 0:c828045bbe69 520 }
embeddedartists 0:c828045bbe69 521 // invalid value
embeddedartists 0:c828045bbe69 522 else {
embeddedartists 0:c828045bbe69 523 continue;
embeddedartists 0:c828045bbe69 524 }
embeddedartists 0:c828045bbe69 525
embeddedartists 0:c828045bbe69 526 _x = ((xhi<<7)|xlo);
embeddedartists 0:c828045bbe69 527 _y = ((yhi<<7)|ylo);
embeddedartists 0:c828045bbe69 528 }
embeddedartists 0:c828045bbe69 529 }
embeddedartists 0:c828045bbe69 530
embeddedartists 0:c828045bbe69 531 bool AR1021I2C::info(int* verHigh, int* verLow, int* resBits, int* type)
embeddedartists 0:c828045bbe69 532 {
embeddedartists 0:c828045bbe69 533 char buff[3] = {0,0,0};
embeddedartists 0:c828045bbe69 534 int read = 3;
embeddedartists 0:c828045bbe69 535 int res = cmd(AR1021_CMD_GET_VERSION, NULL, 0, buff, &read);
embeddedartists 0:c828045bbe69 536 if (res == 0) {
embeddedartists 0:c828045bbe69 537 *verHigh = buff[0];
embeddedartists 0:c828045bbe69 538 *verLow = buff[1];
embeddedartists 0:c828045bbe69 539 switch(buff[2] & 3) {
embeddedartists 0:c828045bbe69 540 case 0:
embeddedartists 0:c828045bbe69 541 *resBits = 8;
embeddedartists 0:c828045bbe69 542 break;
embeddedartists 0:c828045bbe69 543 case 1:
embeddedartists 0:c828045bbe69 544 *resBits = 10;
embeddedartists 0:c828045bbe69 545 break;
embeddedartists 0:c828045bbe69 546 case 2:
embeddedartists 0:c828045bbe69 547 *resBits = 12;
embeddedartists 0:c828045bbe69 548 break;
embeddedartists 0:c828045bbe69 549 case 3:
embeddedartists 0:c828045bbe69 550 *resBits = 12;
embeddedartists 0:c828045bbe69 551 break;
embeddedartists 0:c828045bbe69 552 default:
embeddedartists 0:c828045bbe69 553 res = 25;
embeddedartists 0:c828045bbe69 554 printf("Invalid resolution %d\n", buff[2]&3);
embeddedartists 0:c828045bbe69 555 break;
embeddedartists 0:c828045bbe69 556 }
embeddedartists 0:c828045bbe69 557 *type = buff[2]>>2;
embeddedartists 0:c828045bbe69 558 }
embeddedartists 0:c828045bbe69 559 return (res == 0);
embeddedartists 0:c828045bbe69 560 }