EmbeddedArtists AB / Mbed 2 deprecated lpc4088_ebb_gui_globe

Graphical demo for the LPC4088 Experiment Base Board with one of the Display Expansion Kits. This demo shows a number of dots projected on a rotating sphere.

Dependencies:   EALib mbed

AR1021I2C.cpp@0:79b286950b60, 2014-10-03 (annotated)

Committer:
embeddedartists
Date:
Fri Oct 03 13:15:25 2014 +0000
Revision:
0:79b286950b60
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:79b286950b60 1 /*
embeddedartists 0:79b286950b60 2 * Copyright 2013 Embedded Artists AB
embeddedartists 0:79b286950b60 3 *
embeddedartists 0:79b286950b60 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 0:79b286950b60 5 * you may not use this file except in compliance with the License.
embeddedartists 0:79b286950b60 6 * You may obtain a copy of the License at
embeddedartists 0:79b286950b60 7 *
embeddedartists 0:79b286950b60 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 0:79b286950b60 9 *
embeddedartists 0:79b286950b60 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 0:79b286950b60 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 0:79b286950b60 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 0:79b286950b60 13 * See the License for the specific language governing permissions and
embeddedartists 0:79b286950b60 14 * limitations under the License.
embeddedartists 0:79b286950b60 15 */
embeddedartists 0:79b286950b60 16
embeddedartists 0:79b286950b60 17 /******************************************************************************
embeddedartists 0:79b286950b60 18 * Includes
embeddedartists 0:79b286950b60 19 *****************************************************************************/
embeddedartists 0:79b286950b60 20
embeddedartists 0:79b286950b60 21 #include "mbed.h"
embeddedartists 0:79b286950b60 22 #include "mbed_debug.h"
embeddedartists 0:79b286950b60 23
embeddedartists 0:79b286950b60 24 #include "AR1021I2C.h"
embeddedartists 0:79b286950b60 25
embeddedartists 0:79b286950b60 26 /******************************************************************************
embeddedartists 0:79b286950b60 27 * Defines and typedefs
embeddedartists 0:79b286950b60 28 *****************************************************************************/
embeddedartists 0:79b286950b60 29
embeddedartists 0:79b286950b60 30 #define AR1021_REG_TOUCH_THRESHOLD (0x02)
embeddedartists 0:79b286950b60 31 #define AR1021_REG_SENS_FILTER (0x03)
embeddedartists 0:79b286950b60 32 #define AR1021_REG_SAMPLING_FAST (0x04)
embeddedartists 0:79b286950b60 33 #define AR1021_REG_SAMPLING_SLOW (0x05)
embeddedartists 0:79b286950b60 34 #define AR1021_REG_ACC_FILTER_FAST (0x06)
embeddedartists 0:79b286950b60 35 #define AR1021_REG_ACC_FILTER_SLOW (0x07)
embeddedartists 0:79b286950b60 36 #define AR1021_REG_SPEED_THRESHOLD (0x08)
embeddedartists 0:79b286950b60 37 #define AR1021_REG_SLEEP_DELAY (0x0A)
embeddedartists 0:79b286950b60 38 #define AR1021_REG_PEN_UP_DELAY (0x0B)
embeddedartists 0:79b286950b60 39 #define AR1021_REG_TOUCH_MODE (0x0C)
embeddedartists 0:79b286950b60 40 #define AR1021_REG_TOUCH_OPTIONS (0x0D)
embeddedartists 0:79b286950b60 41 #define AR1021_REG_CALIB_INSETS (0x0E)
embeddedartists 0:79b286950b60 42 #define AR1021_REG_PEN_STATE_REPORT_DELAY (0x0F)
embeddedartists 0:79b286950b60 43 #define AR1021_REG_TOUCH_REPORT_DELAY (0x11)
embeddedartists 0:79b286950b60 44
embeddedartists 0:79b286950b60 45
embeddedartists 0:79b286950b60 46 #define AR1021_CMD_GET_VERSION (0x10)
embeddedartists 0:79b286950b60 47 #define AR1021_CMD_ENABLE_TOUCH (0x12)
embeddedartists 0:79b286950b60 48 #define AR1021_CMD_DISABLE_TOUCH (0x13)
embeddedartists 0:79b286950b60 49 #define AR1021_CMD_CALIBRATE_MODE (0x14)
embeddedartists 0:79b286950b60 50 #define AR1021_CMD_REGISTER_READ (0x20)
embeddedartists 0:79b286950b60 51 #define AR1021_CMD_REGISTER_WRITE (0x21)
embeddedartists 0:79b286950b60 52 #define AR1021_CMD_REGISTER_START_ADDR_REQUEST (0x22)
embeddedartists 0:79b286950b60 53 #define AR1021_CMD_REGISTER_WRITE_TO_EEPROM (0x23)
embeddedartists 0:79b286950b60 54 #define AR1021_CMD_EEPROM_READ (0x28)
embeddedartists 0:79b286950b60 55 #define AR1021_CMD_EEPROM_WRITE (0x29)
embeddedartists 0:79b286950b60 56 #define AR1021_CMD_EEPROM_WRITE_TO_REGISTERS (0x2B)
embeddedartists 0:79b286950b60 57
embeddedartists 0:79b286950b60 58 #define AR1021_RESP_STAT_OK (0x00)
embeddedartists 0:79b286950b60 59 #define AR1021_RESP_STAT_CMD_UNREC (0x01)
embeddedartists 0:79b286950b60 60 #define AR1021_RESP_STAT_HDR_UNREC (0x03)
embeddedartists 0:79b286950b60 61 #define AR1021_RESP_STAT_TIMEOUT (0x04)
embeddedartists 0:79b286950b60 62 #define AR1021_RESP_STAT_CANCEL_CALIB (0xFC)
embeddedartists 0:79b286950b60 63
embeddedartists 0:79b286950b60 64
embeddedartists 0:79b286950b60 65 #define AR1021_ERR_NO_HDR (-1000)
embeddedartists 0:79b286950b60 66 #define AR1021_ERR_INV_LEN (-1001)
embeddedartists 0:79b286950b60 67 #define AR1021_ERR_INV_RESP (-1002)
embeddedartists 0:79b286950b60 68 #define AR1021_ERR_INV_RESPLEN (-1003)
embeddedartists 0:79b286950b60 69 #define AR1021_ERR_TIMEOUT (-1004)
embeddedartists 0:79b286950b60 70
embeddedartists 0:79b286950b60 71 // bit 7 is always 1 and bit 0 defines pen up or down
embeddedartists 0:79b286950b60 72 #define AR1021_PEN_MASK (0x81)
embeddedartists 0:79b286950b60 73
embeddedartists 0:79b286950b60 74 #define AR1021_NUM_CALIB_POINTS (4)
embeddedartists 0:79b286950b60 75
embeddedartists 0:79b286950b60 76 #define AR1021_ADDR (0x4D << 1)
embeddedartists 0:79b286950b60 77
embeddedartists 0:79b286950b60 78 #define AR1021_TIMEOUT 1000 //how many ms to wait for responce
embeddedartists 0:79b286950b60 79 #define AR1021_RETRY 5 //how many times to retry sending command
embeddedartists 0:79b286950b60 80
embeddedartists 0:79b286950b60 81 #define AR1021_MIN(__a, __b) (((__a)<(__b))?(__a):(__b))
embeddedartists 0:79b286950b60 82
embeddedartists 0:79b286950b60 83
embeddedartists 0:79b286950b60 84 AR1021I2C::AR1021I2C(PinName sda, PinName scl, PinName siq) :
embeddedartists 0:79b286950b60 85 _i2c(sda, scl), _siq(siq), _siqIrq(siq)
embeddedartists 0:79b286950b60 86 {
embeddedartists 0:79b286950b60 87 _i2c.frequency(200000);
embeddedartists 0:79b286950b60 88
embeddedartists 0:79b286950b60 89 // default calibration inset is 25 -> (25/2 = 12.5%)
embeddedartists 0:79b286950b60 90 _inset = 25;
embeddedartists 0:79b286950b60 91
embeddedartists 0:79b286950b60 92 // make sure _calibPoint has an invalid value to begin with
embeddedartists 0:79b286950b60 93 // correct value is set in calibrateStart()
embeddedartists 0:79b286950b60 94 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:79b286950b60 95
embeddedartists 0:79b286950b60 96 _x = 0;
embeddedartists 0:79b286950b60 97 _y = 0;
embeddedartists 0:79b286950b60 98 _pen = 0;
embeddedartists 0:79b286950b60 99
embeddedartists 0:79b286950b60 100 _initialized = false;
embeddedartists 0:79b286950b60 101 }
embeddedartists 0:79b286950b60 102
embeddedartists 0:79b286950b60 103
embeddedartists 0:79b286950b60 104 bool AR1021I2C::read(touchCoordinate_t &coord) {
embeddedartists 0:79b286950b60 105
embeddedartists 0:79b286950b60 106 if (!_initialized) return false;
embeddedartists 0:79b286950b60 107
embeddedartists 0:79b286950b60 108 coord.x = _x * _width/4095;
embeddedartists 0:79b286950b60 109 coord.y = _y * _height/4095;
embeddedartists 0:79b286950b60 110 coord.z = _pen;
embeddedartists 0:79b286950b60 111
embeddedartists 0:79b286950b60 112 return true;
embeddedartists 0:79b286950b60 113 }
embeddedartists 0:79b286950b60 114
embeddedartists 0:79b286950b60 115
embeddedartists 0:79b286950b60 116 bool AR1021I2C::init(uint16_t width, uint16_t height) {
embeddedartists 0:79b286950b60 117 int result = 0;
embeddedartists 0:79b286950b60 118 bool ok = false;
embeddedartists 0:79b286950b60 119 int attempts = 0;
embeddedartists 0:79b286950b60 120
embeddedartists 0:79b286950b60 121 _width = width;
embeddedartists 0:79b286950b60 122 _height = height;
embeddedartists 0:79b286950b60 123
embeddedartists 0:79b286950b60 124 while (1) {
embeddedartists 0:79b286950b60 125
embeddedartists 0:79b286950b60 126 do {
embeddedartists 0:79b286950b60 127 // disable touch
embeddedartists 0:79b286950b60 128 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:79b286950b60 129 if (result != 0) {
embeddedartists 0:79b286950b60 130 debug("disable touch failed (%d)\n", result);
embeddedartists 0:79b286950b60 131 break;
embeddedartists 0:79b286950b60 132 }
embeddedartists 0:79b286950b60 133
embeddedartists 0:79b286950b60 134 char regOffset = 0;
embeddedartists 0:79b286950b60 135 int regOffLen = 1;
embeddedartists 0:79b286950b60 136 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:79b286950b60 137 &regOffset, &regOffLen);
embeddedartists 0:79b286950b60 138 if (result != 0) {
embeddedartists 0:79b286950b60 139 debug("register offset request failed (%d)\n", result);
embeddedartists 0:79b286950b60 140 break;
embeddedartists 0:79b286950b60 141 }
embeddedartists 0:79b286950b60 142
embeddedartists 0:79b286950b60 143 // enable calibrated coordinates
embeddedartists 0:79b286950b60 144 // high, low address, len, value
embeddedartists 0:79b286950b60 145 char toptions[4] = {0x00, AR1021_REG_TOUCH_OPTIONS+regOffset, 0x01, 0x01};
embeddedartists 0:79b286950b60 146 result = cmd(AR1021_CMD_REGISTER_WRITE, toptions, 4, NULL, 0);
embeddedartists 0:79b286950b60 147 if (result != 0) {
embeddedartists 0:79b286950b60 148 debug("register write request failed (%d)\n", result);
embeddedartists 0:79b286950b60 149 break;
embeddedartists 0:79b286950b60 150 }
embeddedartists 0:79b286950b60 151
embeddedartists 0:79b286950b60 152 // save registers to eeprom
embeddedartists 0:79b286950b60 153 result = cmd(AR1021_CMD_REGISTER_WRITE_TO_EEPROM, NULL, 0, NULL, 0);
embeddedartists 0:79b286950b60 154 if (result != 0) {
embeddedartists 0:79b286950b60 155 debug("register write to eeprom failed (%d)\n", result);
embeddedartists 0:79b286950b60 156 break;
embeddedartists 0:79b286950b60 157 }
embeddedartists 0:79b286950b60 158
embeddedartists 0:79b286950b60 159 // enable touch
embeddedartists 0:79b286950b60 160 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:79b286950b60 161 if (result != 0) {
embeddedartists 0:79b286950b60 162 debug("enable touch failed (%d)\n", result);
embeddedartists 0:79b286950b60 163 break;
embeddedartists 0:79b286950b60 164 }
embeddedartists 0:79b286950b60 165
embeddedartists 0:79b286950b60 166 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:79b286950b60 167
embeddedartists 0:79b286950b60 168 _initialized = true;
embeddedartists 0:79b286950b60 169 ok = true;
embeddedartists 0:79b286950b60 170
embeddedartists 0:79b286950b60 171 } while(0);
embeddedartists 0:79b286950b60 172
embeddedartists 0:79b286950b60 173 if (ok) break;
embeddedartists 0:79b286950b60 174
embeddedartists 0:79b286950b60 175 // try to run the initialize sequence at most 2 times
embeddedartists 0:79b286950b60 176 if(++attempts >= 2) break;
embeddedartists 0:79b286950b60 177 }
embeddedartists 0:79b286950b60 178
embeddedartists 0:79b286950b60 179
embeddedartists 0:79b286950b60 180 return ok;
embeddedartists 0:79b286950b60 181 }
embeddedartists 0:79b286950b60 182
embeddedartists 0:79b286950b60 183 bool AR1021I2C::calibrateStart() {
embeddedartists 0:79b286950b60 184 bool ok = false;
embeddedartists 0:79b286950b60 185 int result = 0;
embeddedartists 0:79b286950b60 186 int attempts = 0;
embeddedartists 0:79b286950b60 187
embeddedartists 0:79b286950b60 188 if (!_initialized) return false;
embeddedartists 0:79b286950b60 189
embeddedartists 0:79b286950b60 190 _siqIrq.rise(NULL);
embeddedartists 0:79b286950b60 191
embeddedartists 0:79b286950b60 192 while(1) {
embeddedartists 0:79b286950b60 193
embeddedartists 0:79b286950b60 194 do {
embeddedartists 0:79b286950b60 195 // disable touch
embeddedartists 0:79b286950b60 196 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:79b286950b60 197 if (result != 0) {
embeddedartists 0:79b286950b60 198 debug("disable touch failed (%d)\n", result);
embeddedartists 0:79b286950b60 199 break;
embeddedartists 0:79b286950b60 200 }
embeddedartists 0:79b286950b60 201
embeddedartists 0:79b286950b60 202 char regOffset = 0;
embeddedartists 0:79b286950b60 203 int regOffLen = 1;
embeddedartists 0:79b286950b60 204 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:79b286950b60 205 &regOffset, &regOffLen);
embeddedartists 0:79b286950b60 206 if (result != 0) {
embeddedartists 0:79b286950b60 207 debug("register offset request failed (%d)\n", result);
embeddedartists 0:79b286950b60 208 break;
embeddedartists 0:79b286950b60 209 }
embeddedartists 0:79b286950b60 210
embeddedartists 0:79b286950b60 211 // set insets
embeddedartists 0:79b286950b60 212 // enable calibrated coordinates
embeddedartists 0:79b286950b60 213 // high, low address, len, value
embeddedartists 0:79b286950b60 214 char insets[4] = {0x00, AR1021_REG_CALIB_INSETS+regOffset, 0x01, _inset};
embeddedartists 0:79b286950b60 215 result = cmd(AR1021_CMD_REGISTER_WRITE, insets, 4, NULL, 0);
embeddedartists 0:79b286950b60 216 if (result != 0) {
embeddedartists 0:79b286950b60 217 debug("register write request failed (%d)\n", result);
embeddedartists 0:79b286950b60 218 break;
embeddedartists 0:79b286950b60 219 }
embeddedartists 0:79b286950b60 220
embeddedartists 0:79b286950b60 221 // calibration mode
embeddedartists 0:79b286950b60 222 char calibType = 4;
embeddedartists 0:79b286950b60 223 result = cmd(AR1021_CMD_CALIBRATE_MODE, &calibType, 1, NULL, 0, false);
embeddedartists 0:79b286950b60 224 if (result != 0) {
embeddedartists 0:79b286950b60 225 debug("calibration mode failed (%d)\n", result);
embeddedartists 0:79b286950b60 226 break;
embeddedartists 0:79b286950b60 227 }
embeddedartists 0:79b286950b60 228
embeddedartists 0:79b286950b60 229 _calibPoint = 0;
embeddedartists 0:79b286950b60 230 ok = true;
embeddedartists 0:79b286950b60 231
embeddedartists 0:79b286950b60 232 } while(0);
embeddedartists 0:79b286950b60 233
embeddedartists 0:79b286950b60 234 if (ok) break;
embeddedartists 0:79b286950b60 235
embeddedartists 0:79b286950b60 236 // try to run the calibrate mode sequence at most 2 times
embeddedartists 0:79b286950b60 237 if (++attempts >= 2) break;
embeddedartists 0:79b286950b60 238 }
embeddedartists 0:79b286950b60 239
embeddedartists 0:79b286950b60 240 return ok;
embeddedartists 0:79b286950b60 241 }
embeddedartists 0:79b286950b60 242
embeddedartists 0:79b286950b60 243 bool AR1021I2C::getNextCalibratePoint(uint16_t* x, uint16_t* y) {
embeddedartists 0:79b286950b60 244
embeddedartists 0:79b286950b60 245 if (!_initialized) return false;
embeddedartists 0:79b286950b60 246 if (x == NULL || y == NULL) return false;
embeddedartists 0:79b286950b60 247
embeddedartists 0:79b286950b60 248 int xInset = (_width * _inset / 100) / 2;
embeddedartists 0:79b286950b60 249 int yInset = (_height * _inset / 100) / 2;
embeddedartists 0:79b286950b60 250
embeddedartists 0:79b286950b60 251 switch(_calibPoint) {
embeddedartists 0:79b286950b60 252 case 0:
embeddedartists 0:79b286950b60 253 *x = xInset;
embeddedartists 0:79b286950b60 254 *y = yInset;
embeddedartists 0:79b286950b60 255 break;
embeddedartists 0:79b286950b60 256 case 1:
embeddedartists 0:79b286950b60 257 *x = _width - xInset;
embeddedartists 0:79b286950b60 258 *y = yInset;
embeddedartists 0:79b286950b60 259 break;
embeddedartists 0:79b286950b60 260 case 2:
embeddedartists 0:79b286950b60 261 *x = _width - xInset;
embeddedartists 0:79b286950b60 262 *y = _height - yInset;
embeddedartists 0:79b286950b60 263 break;
embeddedartists 0:79b286950b60 264 case 3:
embeddedartists 0:79b286950b60 265 *x = xInset;
embeddedartists 0:79b286950b60 266 *y = _height - yInset;
embeddedartists 0:79b286950b60 267 break;
embeddedartists 0:79b286950b60 268 default:
embeddedartists 0:79b286950b60 269 return false;
embeddedartists 0:79b286950b60 270 }
embeddedartists 0:79b286950b60 271
embeddedartists 0:79b286950b60 272 return true;
embeddedartists 0:79b286950b60 273 }
embeddedartists 0:79b286950b60 274
embeddedartists 0:79b286950b60 275 bool AR1021I2C::waitForCalibratePoint(bool* morePoints, uint32_t timeout) {
embeddedartists 0:79b286950b60 276 int result = 0;
embeddedartists 0:79b286950b60 277 bool ret = false;
embeddedartists 0:79b286950b60 278
embeddedartists 0:79b286950b60 279 if (!_initialized) return false;
embeddedartists 0:79b286950b60 280
embeddedartists 0:79b286950b60 281 do {
embeddedartists 0:79b286950b60 282 if (morePoints == NULL || _calibPoint >= AR1021_NUM_CALIB_POINTS) {
embeddedartists 0:79b286950b60 283 break;
embeddedartists 0:79b286950b60 284 }
embeddedartists 0:79b286950b60 285
embeddedartists 0:79b286950b60 286 // wait for response
embeddedartists 0:79b286950b60 287 result = waitForCalibResponse(timeout);
embeddedartists 0:79b286950b60 288 if (result != 0) {
embeddedartists 0:79b286950b60 289 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:79b286950b60 290 break;
embeddedartists 0:79b286950b60 291 }
embeddedartists 0:79b286950b60 292
embeddedartists 0:79b286950b60 293 _calibPoint++;
embeddedartists 0:79b286950b60 294 *morePoints = (_calibPoint < AR1021_NUM_CALIB_POINTS);
embeddedartists 0:79b286950b60 295
embeddedartists 0:79b286950b60 296
embeddedartists 0:79b286950b60 297 // no more points -> enable touch
embeddedartists 0:79b286950b60 298 if (!(*morePoints)) {
embeddedartists 0:79b286950b60 299
embeddedartists 0:79b286950b60 300 // wait for calibration data to be written to eeprom
embeddedartists 0:79b286950b60 301 // before enabling touch
embeddedartists 0:79b286950b60 302 result = waitForCalibResponse(timeout);
embeddedartists 0:79b286950b60 303 if (result != 0) {
embeddedartists 0:79b286950b60 304 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:79b286950b60 305 break;
embeddedartists 0:79b286950b60 306 }
embeddedartists 0:79b286950b60 307
embeddedartists 0:79b286950b60 308
embeddedartists 0:79b286950b60 309 // clear chip-select since calibration is done;
embeddedartists 0:79b286950b60 310 // _cs = 1;
embeddedartists 0:79b286950b60 311
embeddedartists 0:79b286950b60 312 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:79b286950b60 313 if (result != 0) {
embeddedartists 0:79b286950b60 314 debug("enable touch failed (%d)\n", result);
embeddedartists 0:79b286950b60 315 break;
embeddedartists 0:79b286950b60 316 }
embeddedartists 0:79b286950b60 317
embeddedartists 0:79b286950b60 318 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:79b286950b60 319 }
embeddedartists 0:79b286950b60 320
embeddedartists 0:79b286950b60 321 ret = true;
embeddedartists 0:79b286950b60 322
embeddedartists 0:79b286950b60 323 } while (0);
embeddedartists 0:79b286950b60 324
embeddedartists 0:79b286950b60 325
embeddedartists 0:79b286950b60 326
embeddedartists 0:79b286950b60 327 if (!ret) {
embeddedartists 0:79b286950b60 328 // make sure to set chip-select off in case of an error
embeddedartists 0:79b286950b60 329 // _cs = 1;
embeddedartists 0:79b286950b60 330 // calibration must restart if an error occurred
embeddedartists 0:79b286950b60 331 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:79b286950b60 332 }
embeddedartists 0:79b286950b60 333
embeddedartists 0:79b286950b60 334
embeddedartists 0:79b286950b60 335
embeddedartists 0:79b286950b60 336 return ret;
embeddedartists 0:79b286950b60 337 }
embeddedartists 0:79b286950b60 338
embeddedartists 0:79b286950b60 339 int AR1021I2C::cmd(char cmd, char* data, int len, char* respBuf, int* respLen,
embeddedartists 0:79b286950b60 340 bool setCsOff) {
embeddedartists 0:79b286950b60 341
embeddedartists 0:79b286950b60 342 int ret = 0;
embeddedartists 0:79b286950b60 343 int readLen = (respLen == NULL) ? 0 : *respLen;
embeddedartists 0:79b286950b60 344 for (int attempt = 1; attempt <= AR1021_RETRY; attempt++) {
embeddedartists 0:79b286950b60 345 if (attempt > 1) {
embeddedartists 0:79b286950b60 346 wait_ms(50);
embeddedartists 0:79b286950b60 347 }
embeddedartists 0:79b286950b60 348
embeddedartists 0:79b286950b60 349 // command request
embeddedartists 0:79b286950b60 350 // ---------------
embeddedartists 0:79b286950b60 351 // 0x00 0x55 len cmd data
embeddedartists 0:79b286950b60 352 // 0x00 = protocol command byte
embeddedartists 0:79b286950b60 353 // 0x55 = header
embeddedartists 0:79b286950b60 354 // len = data length + cmd (1)
embeddedartists 0:79b286950b60 355 // data = data to send
embeddedartists 0:79b286950b60 356
embeddedartists 0:79b286950b60 357 _i2c.start();
embeddedartists 0:79b286950b60 358 _i2c.write(AR1021_ADDR); //send write address
embeddedartists 0:79b286950b60 359 _i2c.write(0x00);
embeddedartists 0:79b286950b60 360 _i2c.write(0x55); //header
embeddedartists 0:79b286950b60 361 _i2c.write(len+1); //message length
embeddedartists 0:79b286950b60 362 _i2c.write(cmd);
embeddedartists 0:79b286950b60 363 for (int i = 0; i < len; i++) {
embeddedartists 0:79b286950b60 364 _i2c.write(data[i]);
embeddedartists 0:79b286950b60 365 }
embeddedartists 0:79b286950b60 366 wait_us(60);
embeddedartists 0:79b286950b60 367 _i2c.stop();
embeddedartists 0:79b286950b60 368
embeddedartists 0:79b286950b60 369 // wait for response (siq goes high when response is available)
embeddedartists 0:79b286950b60 370 Timer t;
embeddedartists 0:79b286950b60 371 t.start();
embeddedartists 0:79b286950b60 372 while(_siq.read() != 1 && t.read_ms() < AR1021_TIMEOUT);
embeddedartists 0:79b286950b60 373
embeddedartists 0:79b286950b60 374 if (t.read_ms() < AR1021_TIMEOUT) {
embeddedartists 0:79b286950b60 375
embeddedartists 0:79b286950b60 376 // command response
embeddedartists 0:79b286950b60 377 // ---------------
embeddedartists 0:79b286950b60 378 // 0x55 len status cmd data
embeddedartists 0:79b286950b60 379 // 0x55 = header
embeddedartists 0:79b286950b60 380 // len = number of bytes following the len byte (i.e. including the status&cmd)
embeddedartists 0:79b286950b60 381 // status = status
embeddedartists 0:79b286950b60 382 // cmd = command ID
embeddedartists 0:79b286950b60 383 // data = data to receive
embeddedartists 0:79b286950b60 384 _i2c.start();
embeddedartists 0:79b286950b60 385 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:79b286950b60 386 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:79b286950b60 387 if (header != 0x55) {
embeddedartists 0:79b286950b60 388 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:79b286950b60 389 continue;
embeddedartists 0:79b286950b60 390 }
embeddedartists 0:79b286950b60 391 char length = _i2c.read(1); //data length
embeddedartists 0:79b286950b60 392 if (length < 2) {
embeddedartists 0:79b286950b60 393 ret = AR1021_ERR_INV_LEN; //must have at least status and command bytes
embeddedartists 0:79b286950b60 394 continue;
embeddedartists 0:79b286950b60 395 }
embeddedartists 0:79b286950b60 396 length -= 2;
embeddedartists 0:79b286950b60 397 if (length > readLen) {
embeddedartists 0:79b286950b60 398 ret = AR1021_ERR_INV_LEN; //supplied buffer is not enough
embeddedartists 0:79b286950b60 399 continue;
embeddedartists 0:79b286950b60 400 }
embeddedartists 0:79b286950b60 401
embeddedartists 0:79b286950b60 402 char status = _i2c.read(1); //command status
embeddedartists 0:79b286950b60 403 char usedCmd;
embeddedartists 0:79b286950b60 404 if (readLen <= 0) {
embeddedartists 0:79b286950b60 405 usedCmd = _i2c.read(0); //no data => read command byte + NACK
embeddedartists 0:79b286950b60 406 } else {
embeddedartists 0:79b286950b60 407 usedCmd = _i2c.read(1); //which command
embeddedartists 0:79b286950b60 408
embeddedartists 0:79b286950b60 409 //we need to send a NACK on the last read.
embeddedartists 0:79b286950b60 410 int i;
embeddedartists 0:79b286950b60 411 for (i = 0; i < (length-1); i++) {
embeddedartists 0:79b286950b60 412 respBuf[i] = _i2c.read(1);
embeddedartists 0:79b286950b60 413 }
embeddedartists 0:79b286950b60 414 respBuf[i] = _i2c.read(0); //last returned data byte + NACK
embeddedartists 0:79b286950b60 415 }
embeddedartists 0:79b286950b60 416 _i2c.stop();
embeddedartists 0:79b286950b60 417
embeddedartists 0:79b286950b60 418
embeddedartists 0:79b286950b60 419 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:79b286950b60 420 ret = -status;
embeddedartists 0:79b286950b60 421 continue;
embeddedartists 0:79b286950b60 422 }
embeddedartists 0:79b286950b60 423 if (usedCmd != cmd) {
embeddedartists 0:79b286950b60 424 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:79b286950b60 425 continue;
embeddedartists 0:79b286950b60 426 }
embeddedartists 0:79b286950b60 427
embeddedartists 0:79b286950b60 428 // success
embeddedartists 0:79b286950b60 429 ret = 0;
embeddedartists 0:79b286950b60 430 break;
embeddedartists 0:79b286950b60 431
embeddedartists 0:79b286950b60 432 } else {
embeddedartists 0:79b286950b60 433 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:79b286950b60 434 continue;
embeddedartists 0:79b286950b60 435 }
embeddedartists 0:79b286950b60 436 }
embeddedartists 0:79b286950b60 437
embeddedartists 0:79b286950b60 438 return ret;
embeddedartists 0:79b286950b60 439 }
embeddedartists 0:79b286950b60 440
embeddedartists 0:79b286950b60 441 int AR1021I2C::waitForCalibResponse(uint32_t timeout) {
embeddedartists 0:79b286950b60 442 Timer t;
embeddedartists 0:79b286950b60 443 int ret = 0;
embeddedartists 0:79b286950b60 444
embeddedartists 0:79b286950b60 445 t.start();
embeddedartists 0:79b286950b60 446
embeddedartists 0:79b286950b60 447 // wait for siq
embeddedartists 0:79b286950b60 448 while (_siq.read() != 1 &&
embeddedartists 0:79b286950b60 449 (timeout == 0 || (uint32_t)t.read_ms() < (int)timeout));
embeddedartists 0:79b286950b60 450
embeddedartists 0:79b286950b60 451
embeddedartists 0:79b286950b60 452 do {
embeddedartists 0:79b286950b60 453
embeddedartists 0:79b286950b60 454 if (timeout > 0 && (uint32_t)t.read_ms() >= timeout) {
embeddedartists 0:79b286950b60 455 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:79b286950b60 456 break;
embeddedartists 0:79b286950b60 457 }
embeddedartists 0:79b286950b60 458
embeddedartists 0:79b286950b60 459 // command response
embeddedartists 0:79b286950b60 460 // ---------------
embeddedartists 0:79b286950b60 461 // 0x55 len status cmd data
embeddedartists 0:79b286950b60 462 // 0x55 = header
embeddedartists 0:79b286950b60 463 // len = number of bytes following the len byte (should be 2)
embeddedartists 0:79b286950b60 464 // status = status
embeddedartists 0:79b286950b60 465 // cmd = command ID
embeddedartists 0:79b286950b60 466 _i2c.start();
embeddedartists 0:79b286950b60 467 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:79b286950b60 468 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:79b286950b60 469 char length = _i2c.read(1); //data length
embeddedartists 0:79b286950b60 470
embeddedartists 0:79b286950b60 471 if (header != 0x55) {
embeddedartists 0:79b286950b60 472 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:79b286950b60 473 break;
embeddedartists 0:79b286950b60 474 }
embeddedartists 0:79b286950b60 475 if (length < 2) {
embeddedartists 0:79b286950b60 476 ret = AR1021_ERR_INV_LEN;
embeddedartists 0:79b286950b60 477 break;
embeddedartists 0:79b286950b60 478 }
embeddedartists 0:79b286950b60 479 char status = _i2c.read(1); //status
embeddedartists 0:79b286950b60 480 char cmd = _i2c.read(0); //command, should be NACK'ed
embeddedartists 0:79b286950b60 481 _i2c.stop();
embeddedartists 0:79b286950b60 482 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:79b286950b60 483 ret = -status;
embeddedartists 0:79b286950b60 484 break;
embeddedartists 0:79b286950b60 485 }
embeddedartists 0:79b286950b60 486 if (cmd != AR1021_CMD_CALIBRATE_MODE) {
embeddedartists 0:79b286950b60 487 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:79b286950b60 488 break;
embeddedartists 0:79b286950b60 489 }
embeddedartists 0:79b286950b60 490
embeddedartists 0:79b286950b60 491 // success
embeddedartists 0:79b286950b60 492 ret = 0;
embeddedartists 0:79b286950b60 493
embeddedartists 0:79b286950b60 494 } while (0);
embeddedartists 0:79b286950b60 495
embeddedartists 0:79b286950b60 496 return ret;
embeddedartists 0:79b286950b60 497 }
embeddedartists 0:79b286950b60 498
embeddedartists 0:79b286950b60 499
embeddedartists 0:79b286950b60 500 void AR1021I2C::readTouchIrq() {
embeddedartists 0:79b286950b60 501 while(_siq.read() == 1) {
embeddedartists 0:79b286950b60 502
embeddedartists 0:79b286950b60 503 // touch coordinates are sent in a 5-byte data packet
embeddedartists 0:79b286950b60 504 _i2c.start();
embeddedartists 0:79b286950b60 505 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:79b286950b60 506 int pen = _i2c.read(1);
embeddedartists 0:79b286950b60 507 int xlo = _i2c.read(1);
embeddedartists 0:79b286950b60 508 int xhi = _i2c.read(1);
embeddedartists 0:79b286950b60 509 int ylo = _i2c.read(1);
embeddedartists 0:79b286950b60 510 int yhi = _i2c.read(0);
embeddedartists 0:79b286950b60 511 _i2c.stop();
embeddedartists 0:79b286950b60 512
embeddedartists 0:79b286950b60 513 // pen down
embeddedartists 0:79b286950b60 514 if ((pen&AR1021_PEN_MASK) == (1<<7|1<<0)) {
embeddedartists 0:79b286950b60 515 _pen = 1;
embeddedartists 0:79b286950b60 516 }
embeddedartists 0:79b286950b60 517 // pen up
embeddedartists 0:79b286950b60 518 else if ((pen&AR1021_PEN_MASK) == (1<<7)){
embeddedartists 0:79b286950b60 519 _pen = 0;
embeddedartists 0:79b286950b60 520 }
embeddedartists 0:79b286950b60 521 // invalid value
embeddedartists 0:79b286950b60 522 else {
embeddedartists 0:79b286950b60 523 continue;
embeddedartists 0:79b286950b60 524 }
embeddedartists 0:79b286950b60 525
embeddedartists 0:79b286950b60 526 _x = ((xhi<<7)|xlo);
embeddedartists 0:79b286950b60 527 _y = ((yhi<<7)|ylo);
embeddedartists 0:79b286950b60 528 }
embeddedartists 0:79b286950b60 529 }
embeddedartists 0:79b286950b60 530
embeddedartists 0:79b286950b60 531 bool AR1021I2C::info(int* verHigh, int* verLow, int* resBits, int* type)
embeddedartists 0:79b286950b60 532 {
embeddedartists 0:79b286950b60 533 char buff[3] = {0,0,0};
embeddedartists 0:79b286950b60 534 int read = 3;
embeddedartists 0:79b286950b60 535 int res = cmd(AR1021_CMD_GET_VERSION, NULL, 0, buff, &read);
embeddedartists 0:79b286950b60 536 if (res == 0) {
embeddedartists 0:79b286950b60 537 *verHigh = buff[0];
embeddedartists 0:79b286950b60 538 *verLow = buff[1];
embeddedartists 0:79b286950b60 539 switch(buff[2] & 3) {
embeddedartists 0:79b286950b60 540 case 0:
embeddedartists 0:79b286950b60 541 *resBits = 8;
embeddedartists 0:79b286950b60 542 break;
embeddedartists 0:79b286950b60 543 case 1:
embeddedartists 0:79b286950b60 544 *resBits = 10;
embeddedartists 0:79b286950b60 545 break;
embeddedartists 0:79b286950b60 546 case 2:
embeddedartists 0:79b286950b60 547 *resBits = 12;
embeddedartists 0:79b286950b60 548 break;
embeddedartists 0:79b286950b60 549 case 3:
embeddedartists 0:79b286950b60 550 *resBits = 12;
embeddedartists 0:79b286950b60 551 break;
embeddedartists 0:79b286950b60 552 default:
embeddedartists 0:79b286950b60 553 res = 25;
embeddedartists 0:79b286950b60 554 printf("Invalid resolution %d\n", buff[2]&3);
embeddedartists 0:79b286950b60 555 break;
embeddedartists 0:79b286950b60 556 }
embeddedartists 0:79b286950b60 557 *type = buff[2]>>2;
embeddedartists 0:79b286950b60 558 }
embeddedartists 0:79b286950b60 559 return (res == 0);
embeddedartists 0:79b286950b60 560 }