EmbeddedArtists AB / Mbed 2 deprecated lpc4088_ebb_gui_wave

Graphical demo for the LPC4088 Experiment Base Board with one of the Display Expansion Kits. This program displays a number of dots in a 3D-projected wave.

Dependencies:   EALib mbed

AR1021I2C.cpp@0:d1e4929f6956, 2014-10-03 (annotated)

Committer:
embeddedartists
Date:
Fri Oct 03 13:37:30 2014 +0000
Revision:
0:d1e4929f6956
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:d1e4929f6956 1 /*
embeddedartists 0:d1e4929f6956 2 * Copyright 2013 Embedded Artists AB
embeddedartists 0:d1e4929f6956 3 *
embeddedartists 0:d1e4929f6956 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 0:d1e4929f6956 5 * you may not use this file except in compliance with the License.
embeddedartists 0:d1e4929f6956 6 * You may obtain a copy of the License at
embeddedartists 0:d1e4929f6956 7 *
embeddedartists 0:d1e4929f6956 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 0:d1e4929f6956 9 *
embeddedartists 0:d1e4929f6956 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 0:d1e4929f6956 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 0:d1e4929f6956 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 0:d1e4929f6956 13 * See the License for the specific language governing permissions and
embeddedartists 0:d1e4929f6956 14 * limitations under the License.
embeddedartists 0:d1e4929f6956 15 */
embeddedartists 0:d1e4929f6956 16
embeddedartists 0:d1e4929f6956 17 /******************************************************************************
embeddedartists 0:d1e4929f6956 18 * Includes
embeddedartists 0:d1e4929f6956 19 *****************************************************************************/
embeddedartists 0:d1e4929f6956 20
embeddedartists 0:d1e4929f6956 21 #include "mbed.h"
embeddedartists 0:d1e4929f6956 22 #include "mbed_debug.h"
embeddedartists 0:d1e4929f6956 23
embeddedartists 0:d1e4929f6956 24 #include "AR1021I2C.h"
embeddedartists 0:d1e4929f6956 25
embeddedartists 0:d1e4929f6956 26 /******************************************************************************
embeddedartists 0:d1e4929f6956 27 * Defines and typedefs
embeddedartists 0:d1e4929f6956 28 *****************************************************************************/
embeddedartists 0:d1e4929f6956 29
embeddedartists 0:d1e4929f6956 30 #define AR1021_REG_TOUCH_THRESHOLD (0x02)
embeddedartists 0:d1e4929f6956 31 #define AR1021_REG_SENS_FILTER (0x03)
embeddedartists 0:d1e4929f6956 32 #define AR1021_REG_SAMPLING_FAST (0x04)
embeddedartists 0:d1e4929f6956 33 #define AR1021_REG_SAMPLING_SLOW (0x05)
embeddedartists 0:d1e4929f6956 34 #define AR1021_REG_ACC_FILTER_FAST (0x06)
embeddedartists 0:d1e4929f6956 35 #define AR1021_REG_ACC_FILTER_SLOW (0x07)
embeddedartists 0:d1e4929f6956 36 #define AR1021_REG_SPEED_THRESHOLD (0x08)
embeddedartists 0:d1e4929f6956 37 #define AR1021_REG_SLEEP_DELAY (0x0A)
embeddedartists 0:d1e4929f6956 38 #define AR1021_REG_PEN_UP_DELAY (0x0B)
embeddedartists 0:d1e4929f6956 39 #define AR1021_REG_TOUCH_MODE (0x0C)
embeddedartists 0:d1e4929f6956 40 #define AR1021_REG_TOUCH_OPTIONS (0x0D)
embeddedartists 0:d1e4929f6956 41 #define AR1021_REG_CALIB_INSETS (0x0E)
embeddedartists 0:d1e4929f6956 42 #define AR1021_REG_PEN_STATE_REPORT_DELAY (0x0F)
embeddedartists 0:d1e4929f6956 43 #define AR1021_REG_TOUCH_REPORT_DELAY (0x11)
embeddedartists 0:d1e4929f6956 44
embeddedartists 0:d1e4929f6956 45
embeddedartists 0:d1e4929f6956 46 #define AR1021_CMD_GET_VERSION (0x10)
embeddedartists 0:d1e4929f6956 47 #define AR1021_CMD_ENABLE_TOUCH (0x12)
embeddedartists 0:d1e4929f6956 48 #define AR1021_CMD_DISABLE_TOUCH (0x13)
embeddedartists 0:d1e4929f6956 49 #define AR1021_CMD_CALIBRATE_MODE (0x14)
embeddedartists 0:d1e4929f6956 50 #define AR1021_CMD_REGISTER_READ (0x20)
embeddedartists 0:d1e4929f6956 51 #define AR1021_CMD_REGISTER_WRITE (0x21)
embeddedartists 0:d1e4929f6956 52 #define AR1021_CMD_REGISTER_START_ADDR_REQUEST (0x22)
embeddedartists 0:d1e4929f6956 53 #define AR1021_CMD_REGISTER_WRITE_TO_EEPROM (0x23)
embeddedartists 0:d1e4929f6956 54 #define AR1021_CMD_EEPROM_READ (0x28)
embeddedartists 0:d1e4929f6956 55 #define AR1021_CMD_EEPROM_WRITE (0x29)
embeddedartists 0:d1e4929f6956 56 #define AR1021_CMD_EEPROM_WRITE_TO_REGISTERS (0x2B)
embeddedartists 0:d1e4929f6956 57
embeddedartists 0:d1e4929f6956 58 #define AR1021_RESP_STAT_OK (0x00)
embeddedartists 0:d1e4929f6956 59 #define AR1021_RESP_STAT_CMD_UNREC (0x01)
embeddedartists 0:d1e4929f6956 60 #define AR1021_RESP_STAT_HDR_UNREC (0x03)
embeddedartists 0:d1e4929f6956 61 #define AR1021_RESP_STAT_TIMEOUT (0x04)
embeddedartists 0:d1e4929f6956 62 #define AR1021_RESP_STAT_CANCEL_CALIB (0xFC)
embeddedartists 0:d1e4929f6956 63
embeddedartists 0:d1e4929f6956 64
embeddedartists 0:d1e4929f6956 65 #define AR1021_ERR_NO_HDR (-1000)
embeddedartists 0:d1e4929f6956 66 #define AR1021_ERR_INV_LEN (-1001)
embeddedartists 0:d1e4929f6956 67 #define AR1021_ERR_INV_RESP (-1002)
embeddedartists 0:d1e4929f6956 68 #define AR1021_ERR_INV_RESPLEN (-1003)
embeddedartists 0:d1e4929f6956 69 #define AR1021_ERR_TIMEOUT (-1004)
embeddedartists 0:d1e4929f6956 70
embeddedartists 0:d1e4929f6956 71 // bit 7 is always 1 and bit 0 defines pen up or down
embeddedartists 0:d1e4929f6956 72 #define AR1021_PEN_MASK (0x81)
embeddedartists 0:d1e4929f6956 73
embeddedartists 0:d1e4929f6956 74 #define AR1021_NUM_CALIB_POINTS (4)
embeddedartists 0:d1e4929f6956 75
embeddedartists 0:d1e4929f6956 76 #define AR1021_ADDR (0x4D << 1)
embeddedartists 0:d1e4929f6956 77
embeddedartists 0:d1e4929f6956 78 #define AR1021_TIMEOUT 1000 //how many ms to wait for responce
embeddedartists 0:d1e4929f6956 79 #define AR1021_RETRY 5 //how many times to retry sending command
embeddedartists 0:d1e4929f6956 80
embeddedartists 0:d1e4929f6956 81 #define AR1021_MIN(__a, __b) (((__a)<(__b))?(__a):(__b))
embeddedartists 0:d1e4929f6956 82
embeddedartists 0:d1e4929f6956 83
embeddedartists 0:d1e4929f6956 84 AR1021I2C::AR1021I2C(PinName sda, PinName scl, PinName siq) :
embeddedartists 0:d1e4929f6956 85 _i2c(sda, scl), _siq(siq), _siqIrq(siq)
embeddedartists 0:d1e4929f6956 86 {
embeddedartists 0:d1e4929f6956 87 _i2c.frequency(200000);
embeddedartists 0:d1e4929f6956 88
embeddedartists 0:d1e4929f6956 89 // default calibration inset is 25 -> (25/2 = 12.5%)
embeddedartists 0:d1e4929f6956 90 _inset = 25;
embeddedartists 0:d1e4929f6956 91
embeddedartists 0:d1e4929f6956 92 // make sure _calibPoint has an invalid value to begin with
embeddedartists 0:d1e4929f6956 93 // correct value is set in calibrateStart()
embeddedartists 0:d1e4929f6956 94 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:d1e4929f6956 95
embeddedartists 0:d1e4929f6956 96 _x = 0;
embeddedartists 0:d1e4929f6956 97 _y = 0;
embeddedartists 0:d1e4929f6956 98 _pen = 0;
embeddedartists 0:d1e4929f6956 99
embeddedartists 0:d1e4929f6956 100 _initialized = false;
embeddedartists 0:d1e4929f6956 101 }
embeddedartists 0:d1e4929f6956 102
embeddedartists 0:d1e4929f6956 103
embeddedartists 0:d1e4929f6956 104 bool AR1021I2C::read(touchCoordinate_t &coord) {
embeddedartists 0:d1e4929f6956 105
embeddedartists 0:d1e4929f6956 106 if (!_initialized) return false;
embeddedartists 0:d1e4929f6956 107
embeddedartists 0:d1e4929f6956 108 coord.x = _x * _width/4095;
embeddedartists 0:d1e4929f6956 109 coord.y = _y * _height/4095;
embeddedartists 0:d1e4929f6956 110 coord.z = _pen;
embeddedartists 0:d1e4929f6956 111
embeddedartists 0:d1e4929f6956 112 return true;
embeddedartists 0:d1e4929f6956 113 }
embeddedartists 0:d1e4929f6956 114
embeddedartists 0:d1e4929f6956 115
embeddedartists 0:d1e4929f6956 116 bool AR1021I2C::init(uint16_t width, uint16_t height) {
embeddedartists 0:d1e4929f6956 117 int result = 0;
embeddedartists 0:d1e4929f6956 118 bool ok = false;
embeddedartists 0:d1e4929f6956 119 int attempts = 0;
embeddedartists 0:d1e4929f6956 120
embeddedartists 0:d1e4929f6956 121 _width = width;
embeddedartists 0:d1e4929f6956 122 _height = height;
embeddedartists 0:d1e4929f6956 123
embeddedartists 0:d1e4929f6956 124 while (1) {
embeddedartists 0:d1e4929f6956 125
embeddedartists 0:d1e4929f6956 126 do {
embeddedartists 0:d1e4929f6956 127 // disable touch
embeddedartists 0:d1e4929f6956 128 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:d1e4929f6956 129 if (result != 0) {
embeddedartists 0:d1e4929f6956 130 debug("disable touch failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 131 break;
embeddedartists 0:d1e4929f6956 132 }
embeddedartists 0:d1e4929f6956 133
embeddedartists 0:d1e4929f6956 134 char regOffset = 0;
embeddedartists 0:d1e4929f6956 135 int regOffLen = 1;
embeddedartists 0:d1e4929f6956 136 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:d1e4929f6956 137 &regOffset, &regOffLen);
embeddedartists 0:d1e4929f6956 138 if (result != 0) {
embeddedartists 0:d1e4929f6956 139 debug("register offset request failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 140 break;
embeddedartists 0:d1e4929f6956 141 }
embeddedartists 0:d1e4929f6956 142
embeddedartists 0:d1e4929f6956 143 // enable calibrated coordinates
embeddedartists 0:d1e4929f6956 144 // high, low address, len, value
embeddedartists 0:d1e4929f6956 145 char toptions[4] = {0x00, AR1021_REG_TOUCH_OPTIONS+regOffset, 0x01, 0x01};
embeddedartists 0:d1e4929f6956 146 result = cmd(AR1021_CMD_REGISTER_WRITE, toptions, 4, NULL, 0);
embeddedartists 0:d1e4929f6956 147 if (result != 0) {
embeddedartists 0:d1e4929f6956 148 debug("register write request failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 149 break;
embeddedartists 0:d1e4929f6956 150 }
embeddedartists 0:d1e4929f6956 151
embeddedartists 0:d1e4929f6956 152 // save registers to eeprom
embeddedartists 0:d1e4929f6956 153 result = cmd(AR1021_CMD_REGISTER_WRITE_TO_EEPROM, NULL, 0, NULL, 0);
embeddedartists 0:d1e4929f6956 154 if (result != 0) {
embeddedartists 0:d1e4929f6956 155 debug("register write to eeprom failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 156 break;
embeddedartists 0:d1e4929f6956 157 }
embeddedartists 0:d1e4929f6956 158
embeddedartists 0:d1e4929f6956 159 // enable touch
embeddedartists 0:d1e4929f6956 160 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:d1e4929f6956 161 if (result != 0) {
embeddedartists 0:d1e4929f6956 162 debug("enable touch failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 163 break;
embeddedartists 0:d1e4929f6956 164 }
embeddedartists 0:d1e4929f6956 165
embeddedartists 0:d1e4929f6956 166 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:d1e4929f6956 167
embeddedartists 0:d1e4929f6956 168 _initialized = true;
embeddedartists 0:d1e4929f6956 169 ok = true;
embeddedartists 0:d1e4929f6956 170
embeddedartists 0:d1e4929f6956 171 } while(0);
embeddedartists 0:d1e4929f6956 172
embeddedartists 0:d1e4929f6956 173 if (ok) break;
embeddedartists 0:d1e4929f6956 174
embeddedartists 0:d1e4929f6956 175 // try to run the initialize sequence at most 2 times
embeddedartists 0:d1e4929f6956 176 if(++attempts >= 2) break;
embeddedartists 0:d1e4929f6956 177 }
embeddedartists 0:d1e4929f6956 178
embeddedartists 0:d1e4929f6956 179
embeddedartists 0:d1e4929f6956 180 return ok;
embeddedartists 0:d1e4929f6956 181 }
embeddedartists 0:d1e4929f6956 182
embeddedartists 0:d1e4929f6956 183 bool AR1021I2C::calibrateStart() {
embeddedartists 0:d1e4929f6956 184 bool ok = false;
embeddedartists 0:d1e4929f6956 185 int result = 0;
embeddedartists 0:d1e4929f6956 186 int attempts = 0;
embeddedartists 0:d1e4929f6956 187
embeddedartists 0:d1e4929f6956 188 if (!_initialized) return false;
embeddedartists 0:d1e4929f6956 189
embeddedartists 0:d1e4929f6956 190 _siqIrq.rise(NULL);
embeddedartists 0:d1e4929f6956 191
embeddedartists 0:d1e4929f6956 192 while(1) {
embeddedartists 0:d1e4929f6956 193
embeddedartists 0:d1e4929f6956 194 do {
embeddedartists 0:d1e4929f6956 195 // disable touch
embeddedartists 0:d1e4929f6956 196 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:d1e4929f6956 197 if (result != 0) {
embeddedartists 0:d1e4929f6956 198 debug("disable touch failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 199 break;
embeddedartists 0:d1e4929f6956 200 }
embeddedartists 0:d1e4929f6956 201
embeddedartists 0:d1e4929f6956 202 char regOffset = 0;
embeddedartists 0:d1e4929f6956 203 int regOffLen = 1;
embeddedartists 0:d1e4929f6956 204 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:d1e4929f6956 205 &regOffset, &regOffLen);
embeddedartists 0:d1e4929f6956 206 if (result != 0) {
embeddedartists 0:d1e4929f6956 207 debug("register offset request failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 208 break;
embeddedartists 0:d1e4929f6956 209 }
embeddedartists 0:d1e4929f6956 210
embeddedartists 0:d1e4929f6956 211 // set insets
embeddedartists 0:d1e4929f6956 212 // enable calibrated coordinates
embeddedartists 0:d1e4929f6956 213 // high, low address, len, value
embeddedartists 0:d1e4929f6956 214 char insets[4] = {0x00, AR1021_REG_CALIB_INSETS+regOffset, 0x01, _inset};
embeddedartists 0:d1e4929f6956 215 result = cmd(AR1021_CMD_REGISTER_WRITE, insets, 4, NULL, 0);
embeddedartists 0:d1e4929f6956 216 if (result != 0) {
embeddedartists 0:d1e4929f6956 217 debug("register write request failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 218 break;
embeddedartists 0:d1e4929f6956 219 }
embeddedartists 0:d1e4929f6956 220
embeddedartists 0:d1e4929f6956 221 // calibration mode
embeddedartists 0:d1e4929f6956 222 char calibType = 4;
embeddedartists 0:d1e4929f6956 223 result = cmd(AR1021_CMD_CALIBRATE_MODE, &calibType, 1, NULL, 0, false);
embeddedartists 0:d1e4929f6956 224 if (result != 0) {
embeddedartists 0:d1e4929f6956 225 debug("calibration mode failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 226 break;
embeddedartists 0:d1e4929f6956 227 }
embeddedartists 0:d1e4929f6956 228
embeddedartists 0:d1e4929f6956 229 _calibPoint = 0;
embeddedartists 0:d1e4929f6956 230 ok = true;
embeddedartists 0:d1e4929f6956 231
embeddedartists 0:d1e4929f6956 232 } while(0);
embeddedartists 0:d1e4929f6956 233
embeddedartists 0:d1e4929f6956 234 if (ok) break;
embeddedartists 0:d1e4929f6956 235
embeddedartists 0:d1e4929f6956 236 // try to run the calibrate mode sequence at most 2 times
embeddedartists 0:d1e4929f6956 237 if (++attempts >= 2) break;
embeddedartists 0:d1e4929f6956 238 }
embeddedartists 0:d1e4929f6956 239
embeddedartists 0:d1e4929f6956 240 return ok;
embeddedartists 0:d1e4929f6956 241 }
embeddedartists 0:d1e4929f6956 242
embeddedartists 0:d1e4929f6956 243 bool AR1021I2C::getNextCalibratePoint(uint16_t* x, uint16_t* y) {
embeddedartists 0:d1e4929f6956 244
embeddedartists 0:d1e4929f6956 245 if (!_initialized) return false;
embeddedartists 0:d1e4929f6956 246 if (x == NULL || y == NULL) return false;
embeddedartists 0:d1e4929f6956 247
embeddedartists 0:d1e4929f6956 248 int xInset = (_width * _inset / 100) / 2;
embeddedartists 0:d1e4929f6956 249 int yInset = (_height * _inset / 100) / 2;
embeddedartists 0:d1e4929f6956 250
embeddedartists 0:d1e4929f6956 251 switch(_calibPoint) {
embeddedartists 0:d1e4929f6956 252 case 0:
embeddedartists 0:d1e4929f6956 253 *x = xInset;
embeddedartists 0:d1e4929f6956 254 *y = yInset;
embeddedartists 0:d1e4929f6956 255 break;
embeddedartists 0:d1e4929f6956 256 case 1:
embeddedartists 0:d1e4929f6956 257 *x = _width - xInset;
embeddedartists 0:d1e4929f6956 258 *y = yInset;
embeddedartists 0:d1e4929f6956 259 break;
embeddedartists 0:d1e4929f6956 260 case 2:
embeddedartists 0:d1e4929f6956 261 *x = _width - xInset;
embeddedartists 0:d1e4929f6956 262 *y = _height - yInset;
embeddedartists 0:d1e4929f6956 263 break;
embeddedartists 0:d1e4929f6956 264 case 3:
embeddedartists 0:d1e4929f6956 265 *x = xInset;
embeddedartists 0:d1e4929f6956 266 *y = _height - yInset;
embeddedartists 0:d1e4929f6956 267 break;
embeddedartists 0:d1e4929f6956 268 default:
embeddedartists 0:d1e4929f6956 269 return false;
embeddedartists 0:d1e4929f6956 270 }
embeddedartists 0:d1e4929f6956 271
embeddedartists 0:d1e4929f6956 272 return true;
embeddedartists 0:d1e4929f6956 273 }
embeddedartists 0:d1e4929f6956 274
embeddedartists 0:d1e4929f6956 275 bool AR1021I2C::waitForCalibratePoint(bool* morePoints, uint32_t timeout) {
embeddedartists 0:d1e4929f6956 276 int result = 0;
embeddedartists 0:d1e4929f6956 277 bool ret = false;
embeddedartists 0:d1e4929f6956 278
embeddedartists 0:d1e4929f6956 279 if (!_initialized) return false;
embeddedartists 0:d1e4929f6956 280
embeddedartists 0:d1e4929f6956 281 do {
embeddedartists 0:d1e4929f6956 282 if (morePoints == NULL || _calibPoint >= AR1021_NUM_CALIB_POINTS) {
embeddedartists 0:d1e4929f6956 283 break;
embeddedartists 0:d1e4929f6956 284 }
embeddedartists 0:d1e4929f6956 285
embeddedartists 0:d1e4929f6956 286 // wait for response
embeddedartists 0:d1e4929f6956 287 result = waitForCalibResponse(timeout);
embeddedartists 0:d1e4929f6956 288 if (result != 0) {
embeddedartists 0:d1e4929f6956 289 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 290 break;
embeddedartists 0:d1e4929f6956 291 }
embeddedartists 0:d1e4929f6956 292
embeddedartists 0:d1e4929f6956 293 _calibPoint++;
embeddedartists 0:d1e4929f6956 294 *morePoints = (_calibPoint < AR1021_NUM_CALIB_POINTS);
embeddedartists 0:d1e4929f6956 295
embeddedartists 0:d1e4929f6956 296
embeddedartists 0:d1e4929f6956 297 // no more points -> enable touch
embeddedartists 0:d1e4929f6956 298 if (!(*morePoints)) {
embeddedartists 0:d1e4929f6956 299
embeddedartists 0:d1e4929f6956 300 // wait for calibration data to be written to eeprom
embeddedartists 0:d1e4929f6956 301 // before enabling touch
embeddedartists 0:d1e4929f6956 302 result = waitForCalibResponse(timeout);
embeddedartists 0:d1e4929f6956 303 if (result != 0) {
embeddedartists 0:d1e4929f6956 304 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 305 break;
embeddedartists 0:d1e4929f6956 306 }
embeddedartists 0:d1e4929f6956 307
embeddedartists 0:d1e4929f6956 308
embeddedartists 0:d1e4929f6956 309 // clear chip-select since calibration is done;
embeddedartists 0:d1e4929f6956 310 // _cs = 1;
embeddedartists 0:d1e4929f6956 311
embeddedartists 0:d1e4929f6956 312 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:d1e4929f6956 313 if (result != 0) {
embeddedartists 0:d1e4929f6956 314 debug("enable touch failed (%d)\n", result);
embeddedartists 0:d1e4929f6956 315 break;
embeddedartists 0:d1e4929f6956 316 }
embeddedartists 0:d1e4929f6956 317
embeddedartists 0:d1e4929f6956 318 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:d1e4929f6956 319 }
embeddedartists 0:d1e4929f6956 320
embeddedartists 0:d1e4929f6956 321 ret = true;
embeddedartists 0:d1e4929f6956 322
embeddedartists 0:d1e4929f6956 323 } while (0);
embeddedartists 0:d1e4929f6956 324
embeddedartists 0:d1e4929f6956 325
embeddedartists 0:d1e4929f6956 326
embeddedartists 0:d1e4929f6956 327 if (!ret) {
embeddedartists 0:d1e4929f6956 328 // make sure to set chip-select off in case of an error
embeddedartists 0:d1e4929f6956 329 // _cs = 1;
embeddedartists 0:d1e4929f6956 330 // calibration must restart if an error occurred
embeddedartists 0:d1e4929f6956 331 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:d1e4929f6956 332 }
embeddedartists 0:d1e4929f6956 333
embeddedartists 0:d1e4929f6956 334
embeddedartists 0:d1e4929f6956 335
embeddedartists 0:d1e4929f6956 336 return ret;
embeddedartists 0:d1e4929f6956 337 }
embeddedartists 0:d1e4929f6956 338
embeddedartists 0:d1e4929f6956 339 int AR1021I2C::cmd(char cmd, char* data, int len, char* respBuf, int* respLen,
embeddedartists 0:d1e4929f6956 340 bool setCsOff) {
embeddedartists 0:d1e4929f6956 341
embeddedartists 0:d1e4929f6956 342 int ret = 0;
embeddedartists 0:d1e4929f6956 343 int readLen = (respLen == NULL) ? 0 : *respLen;
embeddedartists 0:d1e4929f6956 344 for (int attempt = 1; attempt <= AR1021_RETRY; attempt++) {
embeddedartists 0:d1e4929f6956 345 if (attempt > 1) {
embeddedartists 0:d1e4929f6956 346 wait_ms(50);
embeddedartists 0:d1e4929f6956 347 }
embeddedartists 0:d1e4929f6956 348
embeddedartists 0:d1e4929f6956 349 // command request
embeddedartists 0:d1e4929f6956 350 // ---------------
embeddedartists 0:d1e4929f6956 351 // 0x00 0x55 len cmd data
embeddedartists 0:d1e4929f6956 352 // 0x00 = protocol command byte
embeddedartists 0:d1e4929f6956 353 // 0x55 = header
embeddedartists 0:d1e4929f6956 354 // len = data length + cmd (1)
embeddedartists 0:d1e4929f6956 355 // data = data to send
embeddedartists 0:d1e4929f6956 356
embeddedartists 0:d1e4929f6956 357 _i2c.start();
embeddedartists 0:d1e4929f6956 358 _i2c.write(AR1021_ADDR); //send write address
embeddedartists 0:d1e4929f6956 359 _i2c.write(0x00);
embeddedartists 0:d1e4929f6956 360 _i2c.write(0x55); //header
embeddedartists 0:d1e4929f6956 361 _i2c.write(len+1); //message length
embeddedartists 0:d1e4929f6956 362 _i2c.write(cmd);
embeddedartists 0:d1e4929f6956 363 for (int i = 0; i < len; i++) {
embeddedartists 0:d1e4929f6956 364 _i2c.write(data[i]);
embeddedartists 0:d1e4929f6956 365 }
embeddedartists 0:d1e4929f6956 366 wait_us(60);
embeddedartists 0:d1e4929f6956 367 _i2c.stop();
embeddedartists 0:d1e4929f6956 368
embeddedartists 0:d1e4929f6956 369 // wait for response (siq goes high when response is available)
embeddedartists 0:d1e4929f6956 370 Timer t;
embeddedartists 0:d1e4929f6956 371 t.start();
embeddedartists 0:d1e4929f6956 372 while(_siq.read() != 1 && t.read_ms() < AR1021_TIMEOUT);
embeddedartists 0:d1e4929f6956 373
embeddedartists 0:d1e4929f6956 374 if (t.read_ms() < AR1021_TIMEOUT) {
embeddedartists 0:d1e4929f6956 375
embeddedartists 0:d1e4929f6956 376 // command response
embeddedartists 0:d1e4929f6956 377 // ---------------
embeddedartists 0:d1e4929f6956 378 // 0x55 len status cmd data
embeddedartists 0:d1e4929f6956 379 // 0x55 = header
embeddedartists 0:d1e4929f6956 380 // len = number of bytes following the len byte (i.e. including the status&cmd)
embeddedartists 0:d1e4929f6956 381 // status = status
embeddedartists 0:d1e4929f6956 382 // cmd = command ID
embeddedartists 0:d1e4929f6956 383 // data = data to receive
embeddedartists 0:d1e4929f6956 384 _i2c.start();
embeddedartists 0:d1e4929f6956 385 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:d1e4929f6956 386 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:d1e4929f6956 387 if (header != 0x55) {
embeddedartists 0:d1e4929f6956 388 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:d1e4929f6956 389 continue;
embeddedartists 0:d1e4929f6956 390 }
embeddedartists 0:d1e4929f6956 391 char length = _i2c.read(1); //data length
embeddedartists 0:d1e4929f6956 392 if (length < 2) {
embeddedartists 0:d1e4929f6956 393 ret = AR1021_ERR_INV_LEN; //must have at least status and command bytes
embeddedartists 0:d1e4929f6956 394 continue;
embeddedartists 0:d1e4929f6956 395 }
embeddedartists 0:d1e4929f6956 396 length -= 2;
embeddedartists 0:d1e4929f6956 397 if (length > readLen) {
embeddedartists 0:d1e4929f6956 398 ret = AR1021_ERR_INV_LEN; //supplied buffer is not enough
embeddedartists 0:d1e4929f6956 399 continue;
embeddedartists 0:d1e4929f6956 400 }
embeddedartists 0:d1e4929f6956 401
embeddedartists 0:d1e4929f6956 402 char status = _i2c.read(1); //command status
embeddedartists 0:d1e4929f6956 403 char usedCmd;
embeddedartists 0:d1e4929f6956 404 if (readLen <= 0) {
embeddedartists 0:d1e4929f6956 405 usedCmd = _i2c.read(0); //no data => read command byte + NACK
embeddedartists 0:d1e4929f6956 406 } else {
embeddedartists 0:d1e4929f6956 407 usedCmd = _i2c.read(1); //which command
embeddedartists 0:d1e4929f6956 408
embeddedartists 0:d1e4929f6956 409 //we need to send a NACK on the last read.
embeddedartists 0:d1e4929f6956 410 int i;
embeddedartists 0:d1e4929f6956 411 for (i = 0; i < (length-1); i++) {
embeddedartists 0:d1e4929f6956 412 respBuf[i] = _i2c.read(1);
embeddedartists 0:d1e4929f6956 413 }
embeddedartists 0:d1e4929f6956 414 respBuf[i] = _i2c.read(0); //last returned data byte + NACK
embeddedartists 0:d1e4929f6956 415 }
embeddedartists 0:d1e4929f6956 416 _i2c.stop();
embeddedartists 0:d1e4929f6956 417
embeddedartists 0:d1e4929f6956 418
embeddedartists 0:d1e4929f6956 419 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:d1e4929f6956 420 ret = -status;
embeddedartists 0:d1e4929f6956 421 continue;
embeddedartists 0:d1e4929f6956 422 }
embeddedartists 0:d1e4929f6956 423 if (usedCmd != cmd) {
embeddedartists 0:d1e4929f6956 424 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:d1e4929f6956 425 continue;
embeddedartists 0:d1e4929f6956 426 }
embeddedartists 0:d1e4929f6956 427
embeddedartists 0:d1e4929f6956 428 // success
embeddedartists 0:d1e4929f6956 429 ret = 0;
embeddedartists 0:d1e4929f6956 430 break;
embeddedartists 0:d1e4929f6956 431
embeddedartists 0:d1e4929f6956 432 } else {
embeddedartists 0:d1e4929f6956 433 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:d1e4929f6956 434 continue;
embeddedartists 0:d1e4929f6956 435 }
embeddedartists 0:d1e4929f6956 436 }
embeddedartists 0:d1e4929f6956 437
embeddedartists 0:d1e4929f6956 438 return ret;
embeddedartists 0:d1e4929f6956 439 }
embeddedartists 0:d1e4929f6956 440
embeddedartists 0:d1e4929f6956 441 int AR1021I2C::waitForCalibResponse(uint32_t timeout) {
embeddedartists 0:d1e4929f6956 442 Timer t;
embeddedartists 0:d1e4929f6956 443 int ret = 0;
embeddedartists 0:d1e4929f6956 444
embeddedartists 0:d1e4929f6956 445 t.start();
embeddedartists 0:d1e4929f6956 446
embeddedartists 0:d1e4929f6956 447 // wait for siq
embeddedartists 0:d1e4929f6956 448 while (_siq.read() != 1 &&
embeddedartists 0:d1e4929f6956 449 (timeout == 0 || (uint32_t)t.read_ms() < (int)timeout));
embeddedartists 0:d1e4929f6956 450
embeddedartists 0:d1e4929f6956 451
embeddedartists 0:d1e4929f6956 452 do {
embeddedartists 0:d1e4929f6956 453
embeddedartists 0:d1e4929f6956 454 if (timeout > 0 && (uint32_t)t.read_ms() >= timeout) {
embeddedartists 0:d1e4929f6956 455 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:d1e4929f6956 456 break;
embeddedartists 0:d1e4929f6956 457 }
embeddedartists 0:d1e4929f6956 458
embeddedartists 0:d1e4929f6956 459 // command response
embeddedartists 0:d1e4929f6956 460 // ---------------
embeddedartists 0:d1e4929f6956 461 // 0x55 len status cmd data
embeddedartists 0:d1e4929f6956 462 // 0x55 = header
embeddedartists 0:d1e4929f6956 463 // len = number of bytes following the len byte (should be 2)
embeddedartists 0:d1e4929f6956 464 // status = status
embeddedartists 0:d1e4929f6956 465 // cmd = command ID
embeddedartists 0:d1e4929f6956 466 _i2c.start();
embeddedartists 0:d1e4929f6956 467 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:d1e4929f6956 468 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:d1e4929f6956 469 char length = _i2c.read(1); //data length
embeddedartists 0:d1e4929f6956 470
embeddedartists 0:d1e4929f6956 471 if (header != 0x55) {
embeddedartists 0:d1e4929f6956 472 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:d1e4929f6956 473 break;
embeddedartists 0:d1e4929f6956 474 }
embeddedartists 0:d1e4929f6956 475 if (length < 2) {
embeddedartists 0:d1e4929f6956 476 ret = AR1021_ERR_INV_LEN;
embeddedartists 0:d1e4929f6956 477 break;
embeddedartists 0:d1e4929f6956 478 }
embeddedartists 0:d1e4929f6956 479 char status = _i2c.read(1); //status
embeddedartists 0:d1e4929f6956 480 char cmd = _i2c.read(0); //command, should be NACK'ed
embeddedartists 0:d1e4929f6956 481 _i2c.stop();
embeddedartists 0:d1e4929f6956 482 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:d1e4929f6956 483 ret = -status;
embeddedartists 0:d1e4929f6956 484 break;
embeddedartists 0:d1e4929f6956 485 }
embeddedartists 0:d1e4929f6956 486 if (cmd != AR1021_CMD_CALIBRATE_MODE) {
embeddedartists 0:d1e4929f6956 487 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:d1e4929f6956 488 break;
embeddedartists 0:d1e4929f6956 489 }
embeddedartists 0:d1e4929f6956 490
embeddedartists 0:d1e4929f6956 491 // success
embeddedartists 0:d1e4929f6956 492 ret = 0;
embeddedartists 0:d1e4929f6956 493
embeddedartists 0:d1e4929f6956 494 } while (0);
embeddedartists 0:d1e4929f6956 495
embeddedartists 0:d1e4929f6956 496 return ret;
embeddedartists 0:d1e4929f6956 497 }
embeddedartists 0:d1e4929f6956 498
embeddedartists 0:d1e4929f6956 499
embeddedartists 0:d1e4929f6956 500 void AR1021I2C::readTouchIrq() {
embeddedartists 0:d1e4929f6956 501 while(_siq.read() == 1) {
embeddedartists 0:d1e4929f6956 502
embeddedartists 0:d1e4929f6956 503 // touch coordinates are sent in a 5-byte data packet
embeddedartists 0:d1e4929f6956 504 _i2c.start();
embeddedartists 0:d1e4929f6956 505 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:d1e4929f6956 506 int pen = _i2c.read(1);
embeddedartists 0:d1e4929f6956 507 int xlo = _i2c.read(1);
embeddedartists 0:d1e4929f6956 508 int xhi = _i2c.read(1);
embeddedartists 0:d1e4929f6956 509 int ylo = _i2c.read(1);
embeddedartists 0:d1e4929f6956 510 int yhi = _i2c.read(0);
embeddedartists 0:d1e4929f6956 511 _i2c.stop();
embeddedartists 0:d1e4929f6956 512
embeddedartists 0:d1e4929f6956 513 // pen down
embeddedartists 0:d1e4929f6956 514 if ((pen&AR1021_PEN_MASK) == (1<<7|1<<0)) {
embeddedartists 0:d1e4929f6956 515 _pen = 1;
embeddedartists 0:d1e4929f6956 516 }
embeddedartists 0:d1e4929f6956 517 // pen up
embeddedartists 0:d1e4929f6956 518 else if ((pen&AR1021_PEN_MASK) == (1<<7)){
embeddedartists 0:d1e4929f6956 519 _pen = 0;
embeddedartists 0:d1e4929f6956 520 }
embeddedartists 0:d1e4929f6956 521 // invalid value
embeddedartists 0:d1e4929f6956 522 else {
embeddedartists 0:d1e4929f6956 523 continue;
embeddedartists 0:d1e4929f6956 524 }
embeddedartists 0:d1e4929f6956 525
embeddedartists 0:d1e4929f6956 526 _x = ((xhi<<7)|xlo);
embeddedartists 0:d1e4929f6956 527 _y = ((yhi<<7)|ylo);
embeddedartists 0:d1e4929f6956 528 }
embeddedartists 0:d1e4929f6956 529 }
embeddedartists 0:d1e4929f6956 530
embeddedartists 0:d1e4929f6956 531 bool AR1021I2C::info(int* verHigh, int* verLow, int* resBits, int* type)
embeddedartists 0:d1e4929f6956 532 {
embeddedartists 0:d1e4929f6956 533 char buff[3] = {0,0,0};
embeddedartists 0:d1e4929f6956 534 int read = 3;
embeddedartists 0:d1e4929f6956 535 int res = cmd(AR1021_CMD_GET_VERSION, NULL, 0, buff, &read);
embeddedartists 0:d1e4929f6956 536 if (res == 0) {
embeddedartists 0:d1e4929f6956 537 *verHigh = buff[0];
embeddedartists 0:d1e4929f6956 538 *verLow = buff[1];
embeddedartists 0:d1e4929f6956 539 switch(buff[2] & 3) {
embeddedartists 0:d1e4929f6956 540 case 0:
embeddedartists 0:d1e4929f6956 541 *resBits = 8;
embeddedartists 0:d1e4929f6956 542 break;
embeddedartists 0:d1e4929f6956 543 case 1:
embeddedartists 0:d1e4929f6956 544 *resBits = 10;
embeddedartists 0:d1e4929f6956 545 break;
embeddedartists 0:d1e4929f6956 546 case 2:
embeddedartists 0:d1e4929f6956 547 *resBits = 12;
embeddedartists 0:d1e4929f6956 548 break;
embeddedartists 0:d1e4929f6956 549 case 3:
embeddedartists 0:d1e4929f6956 550 *resBits = 12;
embeddedartists 0:d1e4929f6956 551 break;
embeddedartists 0:d1e4929f6956 552 default:
embeddedartists 0:d1e4929f6956 553 res = 25;
embeddedartists 0:d1e4929f6956 554 printf("Invalid resolution %d\n", buff[2]&3);
embeddedartists 0:d1e4929f6956 555 break;
embeddedartists 0:d1e4929f6956 556 }
embeddedartists 0:d1e4929f6956 557 *type = buff[2]>>2;
embeddedartists 0:d1e4929f6956 558 }
embeddedartists 0:d1e4929f6956 559 return (res == 0);
embeddedartists 0:d1e4929f6956 560 }