EmbeddedArtists AB / Mbed 2 deprecated lpc4088_ebb_gui_mandelbrot

Graphical demo for the LPC4088 Experiment Base Board with one of the Display Expansion Kits. This program displays a Mandelbrot calculation in a circular zoomed-in sequence.

Dependencies:   EALib mbed

AR1021I2C.cpp@0:e24e3d741c52, 2014-10-03 (annotated)

Committer:
embeddedartists
Date:
Fri Oct 03 13:21:52 2014 +0000
Revision:
0:e24e3d741c52
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:e24e3d741c52 1 /*
embeddedartists 0:e24e3d741c52 2 * Copyright 2013 Embedded Artists AB
embeddedartists 0:e24e3d741c52 3 *
embeddedartists 0:e24e3d741c52 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 0:e24e3d741c52 5 * you may not use this file except in compliance with the License.
embeddedartists 0:e24e3d741c52 6 * You may obtain a copy of the License at
embeddedartists 0:e24e3d741c52 7 *
embeddedartists 0:e24e3d741c52 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 0:e24e3d741c52 9 *
embeddedartists 0:e24e3d741c52 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 0:e24e3d741c52 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 0:e24e3d741c52 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 0:e24e3d741c52 13 * See the License for the specific language governing permissions and
embeddedartists 0:e24e3d741c52 14 * limitations under the License.
embeddedartists 0:e24e3d741c52 15 */
embeddedartists 0:e24e3d741c52 16
embeddedartists 0:e24e3d741c52 17 /******************************************************************************
embeddedartists 0:e24e3d741c52 18 * Includes
embeddedartists 0:e24e3d741c52 19 *****************************************************************************/
embeddedartists 0:e24e3d741c52 20
embeddedartists 0:e24e3d741c52 21 #include "mbed.h"
embeddedartists 0:e24e3d741c52 22 #include "mbed_debug.h"
embeddedartists 0:e24e3d741c52 23
embeddedartists 0:e24e3d741c52 24 #include "AR1021I2C.h"
embeddedartists 0:e24e3d741c52 25
embeddedartists 0:e24e3d741c52 26 /******************************************************************************
embeddedartists 0:e24e3d741c52 27 * Defines and typedefs
embeddedartists 0:e24e3d741c52 28 *****************************************************************************/
embeddedartists 0:e24e3d741c52 29
embeddedartists 0:e24e3d741c52 30 #define AR1021_REG_TOUCH_THRESHOLD (0x02)
embeddedartists 0:e24e3d741c52 31 #define AR1021_REG_SENS_FILTER (0x03)
embeddedartists 0:e24e3d741c52 32 #define AR1021_REG_SAMPLING_FAST (0x04)
embeddedartists 0:e24e3d741c52 33 #define AR1021_REG_SAMPLING_SLOW (0x05)
embeddedartists 0:e24e3d741c52 34 #define AR1021_REG_ACC_FILTER_FAST (0x06)
embeddedartists 0:e24e3d741c52 35 #define AR1021_REG_ACC_FILTER_SLOW (0x07)
embeddedartists 0:e24e3d741c52 36 #define AR1021_REG_SPEED_THRESHOLD (0x08)
embeddedartists 0:e24e3d741c52 37 #define AR1021_REG_SLEEP_DELAY (0x0A)
embeddedartists 0:e24e3d741c52 38 #define AR1021_REG_PEN_UP_DELAY (0x0B)
embeddedartists 0:e24e3d741c52 39 #define AR1021_REG_TOUCH_MODE (0x0C)
embeddedartists 0:e24e3d741c52 40 #define AR1021_REG_TOUCH_OPTIONS (0x0D)
embeddedartists 0:e24e3d741c52 41 #define AR1021_REG_CALIB_INSETS (0x0E)
embeddedartists 0:e24e3d741c52 42 #define AR1021_REG_PEN_STATE_REPORT_DELAY (0x0F)
embeddedartists 0:e24e3d741c52 43 #define AR1021_REG_TOUCH_REPORT_DELAY (0x11)
embeddedartists 0:e24e3d741c52 44
embeddedartists 0:e24e3d741c52 45
embeddedartists 0:e24e3d741c52 46 #define AR1021_CMD_GET_VERSION (0x10)
embeddedartists 0:e24e3d741c52 47 #define AR1021_CMD_ENABLE_TOUCH (0x12)
embeddedartists 0:e24e3d741c52 48 #define AR1021_CMD_DISABLE_TOUCH (0x13)
embeddedartists 0:e24e3d741c52 49 #define AR1021_CMD_CALIBRATE_MODE (0x14)
embeddedartists 0:e24e3d741c52 50 #define AR1021_CMD_REGISTER_READ (0x20)
embeddedartists 0:e24e3d741c52 51 #define AR1021_CMD_REGISTER_WRITE (0x21)
embeddedartists 0:e24e3d741c52 52 #define AR1021_CMD_REGISTER_START_ADDR_REQUEST (0x22)
embeddedartists 0:e24e3d741c52 53 #define AR1021_CMD_REGISTER_WRITE_TO_EEPROM (0x23)
embeddedartists 0:e24e3d741c52 54 #define AR1021_CMD_EEPROM_READ (0x28)
embeddedartists 0:e24e3d741c52 55 #define AR1021_CMD_EEPROM_WRITE (0x29)
embeddedartists 0:e24e3d741c52 56 #define AR1021_CMD_EEPROM_WRITE_TO_REGISTERS (0x2B)
embeddedartists 0:e24e3d741c52 57
embeddedartists 0:e24e3d741c52 58 #define AR1021_RESP_STAT_OK (0x00)
embeddedartists 0:e24e3d741c52 59 #define AR1021_RESP_STAT_CMD_UNREC (0x01)
embeddedartists 0:e24e3d741c52 60 #define AR1021_RESP_STAT_HDR_UNREC (0x03)
embeddedartists 0:e24e3d741c52 61 #define AR1021_RESP_STAT_TIMEOUT (0x04)
embeddedartists 0:e24e3d741c52 62 #define AR1021_RESP_STAT_CANCEL_CALIB (0xFC)
embeddedartists 0:e24e3d741c52 63
embeddedartists 0:e24e3d741c52 64
embeddedartists 0:e24e3d741c52 65 #define AR1021_ERR_NO_HDR (-1000)
embeddedartists 0:e24e3d741c52 66 #define AR1021_ERR_INV_LEN (-1001)
embeddedartists 0:e24e3d741c52 67 #define AR1021_ERR_INV_RESP (-1002)
embeddedartists 0:e24e3d741c52 68 #define AR1021_ERR_INV_RESPLEN (-1003)
embeddedartists 0:e24e3d741c52 69 #define AR1021_ERR_TIMEOUT (-1004)
embeddedartists 0:e24e3d741c52 70
embeddedartists 0:e24e3d741c52 71 // bit 7 is always 1 and bit 0 defines pen up or down
embeddedartists 0:e24e3d741c52 72 #define AR1021_PEN_MASK (0x81)
embeddedartists 0:e24e3d741c52 73
embeddedartists 0:e24e3d741c52 74 #define AR1021_NUM_CALIB_POINTS (4)
embeddedartists 0:e24e3d741c52 75
embeddedartists 0:e24e3d741c52 76 #define AR1021_ADDR (0x4D << 1)
embeddedartists 0:e24e3d741c52 77
embeddedartists 0:e24e3d741c52 78 #define AR1021_TIMEOUT 1000 //how many ms to wait for responce
embeddedartists 0:e24e3d741c52 79 #define AR1021_RETRY 5 //how many times to retry sending command
embeddedartists 0:e24e3d741c52 80
embeddedartists 0:e24e3d741c52 81 #define AR1021_MIN(__a, __b) (((__a)<(__b))?(__a):(__b))
embeddedartists 0:e24e3d741c52 82
embeddedartists 0:e24e3d741c52 83
embeddedartists 0:e24e3d741c52 84 AR1021I2C::AR1021I2C(PinName sda, PinName scl, PinName siq) :
embeddedartists 0:e24e3d741c52 85 _i2c(sda, scl), _siq(siq), _siqIrq(siq)
embeddedartists 0:e24e3d741c52 86 {
embeddedartists 0:e24e3d741c52 87 _i2c.frequency(200000);
embeddedartists 0:e24e3d741c52 88
embeddedartists 0:e24e3d741c52 89 // default calibration inset is 25 -> (25/2 = 12.5%)
embeddedartists 0:e24e3d741c52 90 _inset = 25;
embeddedartists 0:e24e3d741c52 91
embeddedartists 0:e24e3d741c52 92 // make sure _calibPoint has an invalid value to begin with
embeddedartists 0:e24e3d741c52 93 // correct value is set in calibrateStart()
embeddedartists 0:e24e3d741c52 94 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:e24e3d741c52 95
embeddedartists 0:e24e3d741c52 96 _x = 0;
embeddedartists 0:e24e3d741c52 97 _y = 0;
embeddedartists 0:e24e3d741c52 98 _pen = 0;
embeddedartists 0:e24e3d741c52 99
embeddedartists 0:e24e3d741c52 100 _initialized = false;
embeddedartists 0:e24e3d741c52 101 }
embeddedartists 0:e24e3d741c52 102
embeddedartists 0:e24e3d741c52 103
embeddedartists 0:e24e3d741c52 104 bool AR1021I2C::read(touchCoordinate_t &coord) {
embeddedartists 0:e24e3d741c52 105
embeddedartists 0:e24e3d741c52 106 if (!_initialized) return false;
embeddedartists 0:e24e3d741c52 107
embeddedartists 0:e24e3d741c52 108 coord.x = _x * _width/4095;
embeddedartists 0:e24e3d741c52 109 coord.y = _y * _height/4095;
embeddedartists 0:e24e3d741c52 110 coord.z = _pen;
embeddedartists 0:e24e3d741c52 111
embeddedartists 0:e24e3d741c52 112 return true;
embeddedartists 0:e24e3d741c52 113 }
embeddedartists 0:e24e3d741c52 114
embeddedartists 0:e24e3d741c52 115
embeddedartists 0:e24e3d741c52 116 bool AR1021I2C::init(uint16_t width, uint16_t height) {
embeddedartists 0:e24e3d741c52 117 int result = 0;
embeddedartists 0:e24e3d741c52 118 bool ok = false;
embeddedartists 0:e24e3d741c52 119 int attempts = 0;
embeddedartists 0:e24e3d741c52 120
embeddedartists 0:e24e3d741c52 121 _width = width;
embeddedartists 0:e24e3d741c52 122 _height = height;
embeddedartists 0:e24e3d741c52 123
embeddedartists 0:e24e3d741c52 124 while (1) {
embeddedartists 0:e24e3d741c52 125
embeddedartists 0:e24e3d741c52 126 do {
embeddedartists 0:e24e3d741c52 127 // disable touch
embeddedartists 0:e24e3d741c52 128 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:e24e3d741c52 129 if (result != 0) {
embeddedartists 0:e24e3d741c52 130 debug("disable touch failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 131 break;
embeddedartists 0:e24e3d741c52 132 }
embeddedartists 0:e24e3d741c52 133
embeddedartists 0:e24e3d741c52 134 char regOffset = 0;
embeddedartists 0:e24e3d741c52 135 int regOffLen = 1;
embeddedartists 0:e24e3d741c52 136 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:e24e3d741c52 137 &regOffset, &regOffLen);
embeddedartists 0:e24e3d741c52 138 if (result != 0) {
embeddedartists 0:e24e3d741c52 139 debug("register offset request failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 140 break;
embeddedartists 0:e24e3d741c52 141 }
embeddedartists 0:e24e3d741c52 142
embeddedartists 0:e24e3d741c52 143 // enable calibrated coordinates
embeddedartists 0:e24e3d741c52 144 // high, low address, len, value
embeddedartists 0:e24e3d741c52 145 char toptions[4] = {0x00, AR1021_REG_TOUCH_OPTIONS+regOffset, 0x01, 0x01};
embeddedartists 0:e24e3d741c52 146 result = cmd(AR1021_CMD_REGISTER_WRITE, toptions, 4, NULL, 0);
embeddedartists 0:e24e3d741c52 147 if (result != 0) {
embeddedartists 0:e24e3d741c52 148 debug("register write request failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 149 break;
embeddedartists 0:e24e3d741c52 150 }
embeddedartists 0:e24e3d741c52 151
embeddedartists 0:e24e3d741c52 152 // save registers to eeprom
embeddedartists 0:e24e3d741c52 153 result = cmd(AR1021_CMD_REGISTER_WRITE_TO_EEPROM, NULL, 0, NULL, 0);
embeddedartists 0:e24e3d741c52 154 if (result != 0) {
embeddedartists 0:e24e3d741c52 155 debug("register write to eeprom failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 156 break;
embeddedartists 0:e24e3d741c52 157 }
embeddedartists 0:e24e3d741c52 158
embeddedartists 0:e24e3d741c52 159 // enable touch
embeddedartists 0:e24e3d741c52 160 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:e24e3d741c52 161 if (result != 0) {
embeddedartists 0:e24e3d741c52 162 debug("enable touch failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 163 break;
embeddedartists 0:e24e3d741c52 164 }
embeddedartists 0:e24e3d741c52 165
embeddedartists 0:e24e3d741c52 166 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:e24e3d741c52 167
embeddedartists 0:e24e3d741c52 168 _initialized = true;
embeddedartists 0:e24e3d741c52 169 ok = true;
embeddedartists 0:e24e3d741c52 170
embeddedartists 0:e24e3d741c52 171 } while(0);
embeddedartists 0:e24e3d741c52 172
embeddedartists 0:e24e3d741c52 173 if (ok) break;
embeddedartists 0:e24e3d741c52 174
embeddedartists 0:e24e3d741c52 175 // try to run the initialize sequence at most 2 times
embeddedartists 0:e24e3d741c52 176 if(++attempts >= 2) break;
embeddedartists 0:e24e3d741c52 177 }
embeddedartists 0:e24e3d741c52 178
embeddedartists 0:e24e3d741c52 179
embeddedartists 0:e24e3d741c52 180 return ok;
embeddedartists 0:e24e3d741c52 181 }
embeddedartists 0:e24e3d741c52 182
embeddedartists 0:e24e3d741c52 183 bool AR1021I2C::calibrateStart() {
embeddedartists 0:e24e3d741c52 184 bool ok = false;
embeddedartists 0:e24e3d741c52 185 int result = 0;
embeddedartists 0:e24e3d741c52 186 int attempts = 0;
embeddedartists 0:e24e3d741c52 187
embeddedartists 0:e24e3d741c52 188 if (!_initialized) return false;
embeddedartists 0:e24e3d741c52 189
embeddedartists 0:e24e3d741c52 190 _siqIrq.rise(NULL);
embeddedartists 0:e24e3d741c52 191
embeddedartists 0:e24e3d741c52 192 while(1) {
embeddedartists 0:e24e3d741c52 193
embeddedartists 0:e24e3d741c52 194 do {
embeddedartists 0:e24e3d741c52 195 // disable touch
embeddedartists 0:e24e3d741c52 196 result = cmd(AR1021_CMD_DISABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:e24e3d741c52 197 if (result != 0) {
embeddedartists 0:e24e3d741c52 198 debug("disable touch failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 199 break;
embeddedartists 0:e24e3d741c52 200 }
embeddedartists 0:e24e3d741c52 201
embeddedartists 0:e24e3d741c52 202 char regOffset = 0;
embeddedartists 0:e24e3d741c52 203 int regOffLen = 1;
embeddedartists 0:e24e3d741c52 204 result = cmd(AR1021_CMD_REGISTER_START_ADDR_REQUEST, NULL, 0,
embeddedartists 0:e24e3d741c52 205 &regOffset, &regOffLen);
embeddedartists 0:e24e3d741c52 206 if (result != 0) {
embeddedartists 0:e24e3d741c52 207 debug("register offset request failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 208 break;
embeddedartists 0:e24e3d741c52 209 }
embeddedartists 0:e24e3d741c52 210
embeddedartists 0:e24e3d741c52 211 // set insets
embeddedartists 0:e24e3d741c52 212 // enable calibrated coordinates
embeddedartists 0:e24e3d741c52 213 // high, low address, len, value
embeddedartists 0:e24e3d741c52 214 char insets[4] = {0x00, AR1021_REG_CALIB_INSETS+regOffset, 0x01, _inset};
embeddedartists 0:e24e3d741c52 215 result = cmd(AR1021_CMD_REGISTER_WRITE, insets, 4, NULL, 0);
embeddedartists 0:e24e3d741c52 216 if (result != 0) {
embeddedartists 0:e24e3d741c52 217 debug("register write request failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 218 break;
embeddedartists 0:e24e3d741c52 219 }
embeddedartists 0:e24e3d741c52 220
embeddedartists 0:e24e3d741c52 221 // calibration mode
embeddedartists 0:e24e3d741c52 222 char calibType = 4;
embeddedartists 0:e24e3d741c52 223 result = cmd(AR1021_CMD_CALIBRATE_MODE, &calibType, 1, NULL, 0, false);
embeddedartists 0:e24e3d741c52 224 if (result != 0) {
embeddedartists 0:e24e3d741c52 225 debug("calibration mode failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 226 break;
embeddedartists 0:e24e3d741c52 227 }
embeddedartists 0:e24e3d741c52 228
embeddedartists 0:e24e3d741c52 229 _calibPoint = 0;
embeddedartists 0:e24e3d741c52 230 ok = true;
embeddedartists 0:e24e3d741c52 231
embeddedartists 0:e24e3d741c52 232 } while(0);
embeddedartists 0:e24e3d741c52 233
embeddedartists 0:e24e3d741c52 234 if (ok) break;
embeddedartists 0:e24e3d741c52 235
embeddedartists 0:e24e3d741c52 236 // try to run the calibrate mode sequence at most 2 times
embeddedartists 0:e24e3d741c52 237 if (++attempts >= 2) break;
embeddedartists 0:e24e3d741c52 238 }
embeddedartists 0:e24e3d741c52 239
embeddedartists 0:e24e3d741c52 240 return ok;
embeddedartists 0:e24e3d741c52 241 }
embeddedartists 0:e24e3d741c52 242
embeddedartists 0:e24e3d741c52 243 bool AR1021I2C::getNextCalibratePoint(uint16_t* x, uint16_t* y) {
embeddedartists 0:e24e3d741c52 244
embeddedartists 0:e24e3d741c52 245 if (!_initialized) return false;
embeddedartists 0:e24e3d741c52 246 if (x == NULL || y == NULL) return false;
embeddedartists 0:e24e3d741c52 247
embeddedartists 0:e24e3d741c52 248 int xInset = (_width * _inset / 100) / 2;
embeddedartists 0:e24e3d741c52 249 int yInset = (_height * _inset / 100) / 2;
embeddedartists 0:e24e3d741c52 250
embeddedartists 0:e24e3d741c52 251 switch(_calibPoint) {
embeddedartists 0:e24e3d741c52 252 case 0:
embeddedartists 0:e24e3d741c52 253 *x = xInset;
embeddedartists 0:e24e3d741c52 254 *y = yInset;
embeddedartists 0:e24e3d741c52 255 break;
embeddedartists 0:e24e3d741c52 256 case 1:
embeddedartists 0:e24e3d741c52 257 *x = _width - xInset;
embeddedartists 0:e24e3d741c52 258 *y = yInset;
embeddedartists 0:e24e3d741c52 259 break;
embeddedartists 0:e24e3d741c52 260 case 2:
embeddedartists 0:e24e3d741c52 261 *x = _width - xInset;
embeddedartists 0:e24e3d741c52 262 *y = _height - yInset;
embeddedartists 0:e24e3d741c52 263 break;
embeddedartists 0:e24e3d741c52 264 case 3:
embeddedartists 0:e24e3d741c52 265 *x = xInset;
embeddedartists 0:e24e3d741c52 266 *y = _height - yInset;
embeddedartists 0:e24e3d741c52 267 break;
embeddedartists 0:e24e3d741c52 268 default:
embeddedartists 0:e24e3d741c52 269 return false;
embeddedartists 0:e24e3d741c52 270 }
embeddedartists 0:e24e3d741c52 271
embeddedartists 0:e24e3d741c52 272 return true;
embeddedartists 0:e24e3d741c52 273 }
embeddedartists 0:e24e3d741c52 274
embeddedartists 0:e24e3d741c52 275 bool AR1021I2C::waitForCalibratePoint(bool* morePoints, uint32_t timeout) {
embeddedartists 0:e24e3d741c52 276 int result = 0;
embeddedartists 0:e24e3d741c52 277 bool ret = false;
embeddedartists 0:e24e3d741c52 278
embeddedartists 0:e24e3d741c52 279 if (!_initialized) return false;
embeddedartists 0:e24e3d741c52 280
embeddedartists 0:e24e3d741c52 281 do {
embeddedartists 0:e24e3d741c52 282 if (morePoints == NULL || _calibPoint >= AR1021_NUM_CALIB_POINTS) {
embeddedartists 0:e24e3d741c52 283 break;
embeddedartists 0:e24e3d741c52 284 }
embeddedartists 0:e24e3d741c52 285
embeddedartists 0:e24e3d741c52 286 // wait for response
embeddedartists 0:e24e3d741c52 287 result = waitForCalibResponse(timeout);
embeddedartists 0:e24e3d741c52 288 if (result != 0) {
embeddedartists 0:e24e3d741c52 289 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 290 break;
embeddedartists 0:e24e3d741c52 291 }
embeddedartists 0:e24e3d741c52 292
embeddedartists 0:e24e3d741c52 293 _calibPoint++;
embeddedartists 0:e24e3d741c52 294 *morePoints = (_calibPoint < AR1021_NUM_CALIB_POINTS);
embeddedartists 0:e24e3d741c52 295
embeddedartists 0:e24e3d741c52 296
embeddedartists 0:e24e3d741c52 297 // no more points -> enable touch
embeddedartists 0:e24e3d741c52 298 if (!(*morePoints)) {
embeddedartists 0:e24e3d741c52 299
embeddedartists 0:e24e3d741c52 300 // wait for calibration data to be written to eeprom
embeddedartists 0:e24e3d741c52 301 // before enabling touch
embeddedartists 0:e24e3d741c52 302 result = waitForCalibResponse(timeout);
embeddedartists 0:e24e3d741c52 303 if (result != 0) {
embeddedartists 0:e24e3d741c52 304 debug("wait for calibration response failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 305 break;
embeddedartists 0:e24e3d741c52 306 }
embeddedartists 0:e24e3d741c52 307
embeddedartists 0:e24e3d741c52 308
embeddedartists 0:e24e3d741c52 309 // clear chip-select since calibration is done;
embeddedartists 0:e24e3d741c52 310 // _cs = 1;
embeddedartists 0:e24e3d741c52 311
embeddedartists 0:e24e3d741c52 312 result = cmd(AR1021_CMD_ENABLE_TOUCH, NULL, 0, NULL, 0);
embeddedartists 0:e24e3d741c52 313 if (result != 0) {
embeddedartists 0:e24e3d741c52 314 debug("enable touch failed (%d)\n", result);
embeddedartists 0:e24e3d741c52 315 break;
embeddedartists 0:e24e3d741c52 316 }
embeddedartists 0:e24e3d741c52 317
embeddedartists 0:e24e3d741c52 318 _siqIrq.rise(this, &AR1021I2C::readTouchIrq);
embeddedartists 0:e24e3d741c52 319 }
embeddedartists 0:e24e3d741c52 320
embeddedartists 0:e24e3d741c52 321 ret = true;
embeddedartists 0:e24e3d741c52 322
embeddedartists 0:e24e3d741c52 323 } while (0);
embeddedartists 0:e24e3d741c52 324
embeddedartists 0:e24e3d741c52 325
embeddedartists 0:e24e3d741c52 326
embeddedartists 0:e24e3d741c52 327 if (!ret) {
embeddedartists 0:e24e3d741c52 328 // make sure to set chip-select off in case of an error
embeddedartists 0:e24e3d741c52 329 // _cs = 1;
embeddedartists 0:e24e3d741c52 330 // calibration must restart if an error occurred
embeddedartists 0:e24e3d741c52 331 _calibPoint = AR1021_NUM_CALIB_POINTS+1;
embeddedartists 0:e24e3d741c52 332 }
embeddedartists 0:e24e3d741c52 333
embeddedartists 0:e24e3d741c52 334
embeddedartists 0:e24e3d741c52 335
embeddedartists 0:e24e3d741c52 336 return ret;
embeddedartists 0:e24e3d741c52 337 }
embeddedartists 0:e24e3d741c52 338
embeddedartists 0:e24e3d741c52 339 int AR1021I2C::cmd(char cmd, char* data, int len, char* respBuf, int* respLen,
embeddedartists 0:e24e3d741c52 340 bool setCsOff) {
embeddedartists 0:e24e3d741c52 341
embeddedartists 0:e24e3d741c52 342 int ret = 0;
embeddedartists 0:e24e3d741c52 343 int readLen = (respLen == NULL) ? 0 : *respLen;
embeddedartists 0:e24e3d741c52 344 for (int attempt = 1; attempt <= AR1021_RETRY; attempt++) {
embeddedartists 0:e24e3d741c52 345 if (attempt > 1) {
embeddedartists 0:e24e3d741c52 346 wait_ms(50);
embeddedartists 0:e24e3d741c52 347 }
embeddedartists 0:e24e3d741c52 348
embeddedartists 0:e24e3d741c52 349 // command request
embeddedartists 0:e24e3d741c52 350 // ---------------
embeddedartists 0:e24e3d741c52 351 // 0x00 0x55 len cmd data
embeddedartists 0:e24e3d741c52 352 // 0x00 = protocol command byte
embeddedartists 0:e24e3d741c52 353 // 0x55 = header
embeddedartists 0:e24e3d741c52 354 // len = data length + cmd (1)
embeddedartists 0:e24e3d741c52 355 // data = data to send
embeddedartists 0:e24e3d741c52 356
embeddedartists 0:e24e3d741c52 357 _i2c.start();
embeddedartists 0:e24e3d741c52 358 _i2c.write(AR1021_ADDR); //send write address
embeddedartists 0:e24e3d741c52 359 _i2c.write(0x00);
embeddedartists 0:e24e3d741c52 360 _i2c.write(0x55); //header
embeddedartists 0:e24e3d741c52 361 _i2c.write(len+1); //message length
embeddedartists 0:e24e3d741c52 362 _i2c.write(cmd);
embeddedartists 0:e24e3d741c52 363 for (int i = 0; i < len; i++) {
embeddedartists 0:e24e3d741c52 364 _i2c.write(data[i]);
embeddedartists 0:e24e3d741c52 365 }
embeddedartists 0:e24e3d741c52 366 wait_us(60);
embeddedartists 0:e24e3d741c52 367 _i2c.stop();
embeddedartists 0:e24e3d741c52 368
embeddedartists 0:e24e3d741c52 369 // wait for response (siq goes high when response is available)
embeddedartists 0:e24e3d741c52 370 Timer t;
embeddedartists 0:e24e3d741c52 371 t.start();
embeddedartists 0:e24e3d741c52 372 while(_siq.read() != 1 && t.read_ms() < AR1021_TIMEOUT);
embeddedartists 0:e24e3d741c52 373
embeddedartists 0:e24e3d741c52 374 if (t.read_ms() < AR1021_TIMEOUT) {
embeddedartists 0:e24e3d741c52 375
embeddedartists 0:e24e3d741c52 376 // command response
embeddedartists 0:e24e3d741c52 377 // ---------------
embeddedartists 0:e24e3d741c52 378 // 0x55 len status cmd data
embeddedartists 0:e24e3d741c52 379 // 0x55 = header
embeddedartists 0:e24e3d741c52 380 // len = number of bytes following the len byte (i.e. including the status&cmd)
embeddedartists 0:e24e3d741c52 381 // status = status
embeddedartists 0:e24e3d741c52 382 // cmd = command ID
embeddedartists 0:e24e3d741c52 383 // data = data to receive
embeddedartists 0:e24e3d741c52 384 _i2c.start();
embeddedartists 0:e24e3d741c52 385 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:e24e3d741c52 386 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:e24e3d741c52 387 if (header != 0x55) {
embeddedartists 0:e24e3d741c52 388 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:e24e3d741c52 389 continue;
embeddedartists 0:e24e3d741c52 390 }
embeddedartists 0:e24e3d741c52 391 char length = _i2c.read(1); //data length
embeddedartists 0:e24e3d741c52 392 if (length < 2) {
embeddedartists 0:e24e3d741c52 393 ret = AR1021_ERR_INV_LEN; //must have at least status and command bytes
embeddedartists 0:e24e3d741c52 394 continue;
embeddedartists 0:e24e3d741c52 395 }
embeddedartists 0:e24e3d741c52 396 length -= 2;
embeddedartists 0:e24e3d741c52 397 if (length > readLen) {
embeddedartists 0:e24e3d741c52 398 ret = AR1021_ERR_INV_LEN; //supplied buffer is not enough
embeddedartists 0:e24e3d741c52 399 continue;
embeddedartists 0:e24e3d741c52 400 }
embeddedartists 0:e24e3d741c52 401
embeddedartists 0:e24e3d741c52 402 char status = _i2c.read(1); //command status
embeddedartists 0:e24e3d741c52 403 char usedCmd;
embeddedartists 0:e24e3d741c52 404 if (readLen <= 0) {
embeddedartists 0:e24e3d741c52 405 usedCmd = _i2c.read(0); //no data => read command byte + NACK
embeddedartists 0:e24e3d741c52 406 } else {
embeddedartists 0:e24e3d741c52 407 usedCmd = _i2c.read(1); //which command
embeddedartists 0:e24e3d741c52 408
embeddedartists 0:e24e3d741c52 409 //we need to send a NACK on the last read.
embeddedartists 0:e24e3d741c52 410 int i;
embeddedartists 0:e24e3d741c52 411 for (i = 0; i < (length-1); i++) {
embeddedartists 0:e24e3d741c52 412 respBuf[i] = _i2c.read(1);
embeddedartists 0:e24e3d741c52 413 }
embeddedartists 0:e24e3d741c52 414 respBuf[i] = _i2c.read(0); //last returned data byte + NACK
embeddedartists 0:e24e3d741c52 415 }
embeddedartists 0:e24e3d741c52 416 _i2c.stop();
embeddedartists 0:e24e3d741c52 417
embeddedartists 0:e24e3d741c52 418
embeddedartists 0:e24e3d741c52 419 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:e24e3d741c52 420 ret = -status;
embeddedartists 0:e24e3d741c52 421 continue;
embeddedartists 0:e24e3d741c52 422 }
embeddedartists 0:e24e3d741c52 423 if (usedCmd != cmd) {
embeddedartists 0:e24e3d741c52 424 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:e24e3d741c52 425 continue;
embeddedartists 0:e24e3d741c52 426 }
embeddedartists 0:e24e3d741c52 427
embeddedartists 0:e24e3d741c52 428 // success
embeddedartists 0:e24e3d741c52 429 ret = 0;
embeddedartists 0:e24e3d741c52 430 break;
embeddedartists 0:e24e3d741c52 431
embeddedartists 0:e24e3d741c52 432 } else {
embeddedartists 0:e24e3d741c52 433 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:e24e3d741c52 434 continue;
embeddedartists 0:e24e3d741c52 435 }
embeddedartists 0:e24e3d741c52 436 }
embeddedartists 0:e24e3d741c52 437
embeddedartists 0:e24e3d741c52 438 return ret;
embeddedartists 0:e24e3d741c52 439 }
embeddedartists 0:e24e3d741c52 440
embeddedartists 0:e24e3d741c52 441 int AR1021I2C::waitForCalibResponse(uint32_t timeout) {
embeddedartists 0:e24e3d741c52 442 Timer t;
embeddedartists 0:e24e3d741c52 443 int ret = 0;
embeddedartists 0:e24e3d741c52 444
embeddedartists 0:e24e3d741c52 445 t.start();
embeddedartists 0:e24e3d741c52 446
embeddedartists 0:e24e3d741c52 447 // wait for siq
embeddedartists 0:e24e3d741c52 448 while (_siq.read() != 1 &&
embeddedartists 0:e24e3d741c52 449 (timeout == 0 || (uint32_t)t.read_ms() < (int)timeout));
embeddedartists 0:e24e3d741c52 450
embeddedartists 0:e24e3d741c52 451
embeddedartists 0:e24e3d741c52 452 do {
embeddedartists 0:e24e3d741c52 453
embeddedartists 0:e24e3d741c52 454 if (timeout > 0 && (uint32_t)t.read_ms() >= timeout) {
embeddedartists 0:e24e3d741c52 455 ret = AR1021_ERR_TIMEOUT;
embeddedartists 0:e24e3d741c52 456 break;
embeddedartists 0:e24e3d741c52 457 }
embeddedartists 0:e24e3d741c52 458
embeddedartists 0:e24e3d741c52 459 // command response
embeddedartists 0:e24e3d741c52 460 // ---------------
embeddedartists 0:e24e3d741c52 461 // 0x55 len status cmd data
embeddedartists 0:e24e3d741c52 462 // 0x55 = header
embeddedartists 0:e24e3d741c52 463 // len = number of bytes following the len byte (should be 2)
embeddedartists 0:e24e3d741c52 464 // status = status
embeddedartists 0:e24e3d741c52 465 // cmd = command ID
embeddedartists 0:e24e3d741c52 466 _i2c.start();
embeddedartists 0:e24e3d741c52 467 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:e24e3d741c52 468 char header = _i2c.read(1); //header should always be 0x55
embeddedartists 0:e24e3d741c52 469 char length = _i2c.read(1); //data length
embeddedartists 0:e24e3d741c52 470
embeddedartists 0:e24e3d741c52 471 if (header != 0x55) {
embeddedartists 0:e24e3d741c52 472 ret = AR1021_ERR_NO_HDR;
embeddedartists 0:e24e3d741c52 473 break;
embeddedartists 0:e24e3d741c52 474 }
embeddedartists 0:e24e3d741c52 475 if (length < 2) {
embeddedartists 0:e24e3d741c52 476 ret = AR1021_ERR_INV_LEN;
embeddedartists 0:e24e3d741c52 477 break;
embeddedartists 0:e24e3d741c52 478 }
embeddedartists 0:e24e3d741c52 479 char status = _i2c.read(1); //status
embeddedartists 0:e24e3d741c52 480 char cmd = _i2c.read(0); //command, should be NACK'ed
embeddedartists 0:e24e3d741c52 481 _i2c.stop();
embeddedartists 0:e24e3d741c52 482 if (status != AR1021_RESP_STAT_OK) {
embeddedartists 0:e24e3d741c52 483 ret = -status;
embeddedartists 0:e24e3d741c52 484 break;
embeddedartists 0:e24e3d741c52 485 }
embeddedartists 0:e24e3d741c52 486 if (cmd != AR1021_CMD_CALIBRATE_MODE) {
embeddedartists 0:e24e3d741c52 487 ret = AR1021_ERR_INV_RESP;
embeddedartists 0:e24e3d741c52 488 break;
embeddedartists 0:e24e3d741c52 489 }
embeddedartists 0:e24e3d741c52 490
embeddedartists 0:e24e3d741c52 491 // success
embeddedartists 0:e24e3d741c52 492 ret = 0;
embeddedartists 0:e24e3d741c52 493
embeddedartists 0:e24e3d741c52 494 } while (0);
embeddedartists 0:e24e3d741c52 495
embeddedartists 0:e24e3d741c52 496 return ret;
embeddedartists 0:e24e3d741c52 497 }
embeddedartists 0:e24e3d741c52 498
embeddedartists 0:e24e3d741c52 499
embeddedartists 0:e24e3d741c52 500 void AR1021I2C::readTouchIrq() {
embeddedartists 0:e24e3d741c52 501 while(_siq.read() == 1) {
embeddedartists 0:e24e3d741c52 502
embeddedartists 0:e24e3d741c52 503 // touch coordinates are sent in a 5-byte data packet
embeddedartists 0:e24e3d741c52 504 _i2c.start();
embeddedartists 0:e24e3d741c52 505 _i2c.write(AR1021_ADDR + 1); //send read address
embeddedartists 0:e24e3d741c52 506 int pen = _i2c.read(1);
embeddedartists 0:e24e3d741c52 507 int xlo = _i2c.read(1);
embeddedartists 0:e24e3d741c52 508 int xhi = _i2c.read(1);
embeddedartists 0:e24e3d741c52 509 int ylo = _i2c.read(1);
embeddedartists 0:e24e3d741c52 510 int yhi = _i2c.read(0);
embeddedartists 0:e24e3d741c52 511 _i2c.stop();
embeddedartists 0:e24e3d741c52 512
embeddedartists 0:e24e3d741c52 513 // pen down
embeddedartists 0:e24e3d741c52 514 if ((pen&AR1021_PEN_MASK) == (1<<7|1<<0)) {
embeddedartists 0:e24e3d741c52 515 _pen = 1;
embeddedartists 0:e24e3d741c52 516 }
embeddedartists 0:e24e3d741c52 517 // pen up
embeddedartists 0:e24e3d741c52 518 else if ((pen&AR1021_PEN_MASK) == (1<<7)){
embeddedartists 0:e24e3d741c52 519 _pen = 0;
embeddedartists 0:e24e3d741c52 520 }
embeddedartists 0:e24e3d741c52 521 // invalid value
embeddedartists 0:e24e3d741c52 522 else {
embeddedartists 0:e24e3d741c52 523 continue;
embeddedartists 0:e24e3d741c52 524 }
embeddedartists 0:e24e3d741c52 525
embeddedartists 0:e24e3d741c52 526 _x = ((xhi<<7)|xlo);
embeddedartists 0:e24e3d741c52 527 _y = ((yhi<<7)|ylo);
embeddedartists 0:e24e3d741c52 528 }
embeddedartists 0:e24e3d741c52 529 }
embeddedartists 0:e24e3d741c52 530
embeddedartists 0:e24e3d741c52 531 bool AR1021I2C::info(int* verHigh, int* verLow, int* resBits, int* type)
embeddedartists 0:e24e3d741c52 532 {
embeddedartists 0:e24e3d741c52 533 char buff[3] = {0,0,0};
embeddedartists 0:e24e3d741c52 534 int read = 3;
embeddedartists 0:e24e3d741c52 535 int res = cmd(AR1021_CMD_GET_VERSION, NULL, 0, buff, &read);
embeddedartists 0:e24e3d741c52 536 if (res == 0) {
embeddedartists 0:e24e3d741c52 537 *verHigh = buff[0];
embeddedartists 0:e24e3d741c52 538 *verLow = buff[1];
embeddedartists 0:e24e3d741c52 539 switch(buff[2] & 3) {
embeddedartists 0:e24e3d741c52 540 case 0:
embeddedartists 0:e24e3d741c52 541 *resBits = 8;
embeddedartists 0:e24e3d741c52 542 break;
embeddedartists 0:e24e3d741c52 543 case 1:
embeddedartists 0:e24e3d741c52 544 *resBits = 10;
embeddedartists 0:e24e3d741c52 545 break;
embeddedartists 0:e24e3d741c52 546 case 2:
embeddedartists 0:e24e3d741c52 547 *resBits = 12;
embeddedartists 0:e24e3d741c52 548 break;
embeddedartists 0:e24e3d741c52 549 case 3:
embeddedartists 0:e24e3d741c52 550 *resBits = 12;
embeddedartists 0:e24e3d741c52 551 break;
embeddedartists 0:e24e3d741c52 552 default:
embeddedartists 0:e24e3d741c52 553 res = 25;
embeddedartists 0:e24e3d741c52 554 printf("Invalid resolution %d\n", buff[2]&3);
embeddedartists 0:e24e3d741c52 555 break;
embeddedartists 0:e24e3d741c52 556 }
embeddedartists 0:e24e3d741c52 557 *type = buff[2]>>2;
embeddedartists 0:e24e3d741c52 558 }
embeddedartists 0:e24e3d741c52 559 return (res == 0);
embeddedartists 0:e24e3d741c52 560 }