Jack Berkhout / FT6206

FT6206 Library for Adafruit 2.8" TFT Touch Shield for Arduino w/Capacitive Touch

Dependents:   ArchPro_TFT ATT_AWS_IoT_demo_v06 ArchPro_TFT TermProject

FT6206.cpp@8:b6e95d327cd3, 2015-03-24 (annotated)

Committer:
JackB
Date:
Tue Mar 24 01:25:16 2015 +0000
Revision:
8:b6e95d327cd3
Parent:
7:3896a0daed43
Child:
9:fff166330146
updated

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JackB 4:b9ff3c020e7f 1 /*
JackB 4:b9ff3c020e7f 2 Copyright (c) 2015 Jack Berkhout
JackB 0:d146e986a07f 3
JackB 4:b9ff3c020e7f 4 Permission is hereby granted, free of charge, to any person obtaining a copy
JackB 4:b9ff3c020e7f 5 of this software and associated documentation files (the "Software"), to deal
JackB 4:b9ff3c020e7f 6 in the Software without restriction, including without limitation the rights
JackB 4:b9ff3c020e7f 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
JackB 4:b9ff3c020e7f 8 copies of the Software, and to permit persons to whom the Software is
JackB 4:b9ff3c020e7f 9 furnished to do so, subject to the following conditions:
JackB 4:b9ff3c020e7f 10
JackB 4:b9ff3c020e7f 11 The above copyright notice and this permission notice shall be included in
JackB 4:b9ff3c020e7f 12 all copies or substantial portions of the Software.
JackB 4:b9ff3c020e7f 13
JackB 4:b9ff3c020e7f 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
JackB 4:b9ff3c020e7f 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
JackB 4:b9ff3c020e7f 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
JackB 4:b9ff3c020e7f 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
JackB 4:b9ff3c020e7f 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
JackB 4:b9ff3c020e7f 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
JackB 4:b9ff3c020e7f 20 THE SOFTWARE.
JackB 0:d146e986a07f 21
JackB 4:b9ff3c020e7f 22 This is a library for the Adafruit Capacitive Touch Screens
JackB 4:b9ff3c020e7f 23 ----> http://www.adafruit.com/products/1947
JackB 4:b9ff3c020e7f 24 This chipset uses I2C to communicate
JackB 4:b9ff3c020e7f 25
JackB 4:b9ff3c020e7f 26 Based on Arduino written by Limor Fried/Ladyada for Adafruit Industries.
JackB 4:b9ff3c020e7f 27
JackB 4:b9ff3c020e7f 28 On the shield, these jumpers were bridged:
JackB 4:b9ff3c020e7f 29 Int - #7 (default)
JackB 4:b9ff3c020e7f 30 SCK - 13 (default)
JackB 4:b9ff3c020e7f 31 SO - 12 (default)
JackB 4:b9ff3c020e7f 32 SI - 11
JackB 4:b9ff3c020e7f 33 SCL - SCL
JackB 4:b9ff3c020e7f 34 SDA - SDA
JackB 4:b9ff3c020e7f 35
JackB 2:35e21af6733c 36 Usage:
JackB 1:43274ec89d1a 37
JackB 3:8e16a8987166 38 #include "mbed.h"
JackB 3:8e16a8987166 39 #include "SPI_TFT_ILI9341.h"
JackB 3:8e16a8987166 40 #include "FT6206.h"
JackB 3:8e16a8987166 41 #include "Arial12x12.h"
JackB 3:8e16a8987166 42
JackB 3:8e16a8987166 43 #define PIN_XP A3
JackB 3:8e16a8987166 44 #define PIN_XM A1
JackB 3:8e16a8987166 45 #define PIN_YP A2
JackB 3:8e16a8987166 46 #define PIN_YM A0
JackB 3:8e16a8987166 47 #define PIN_SCLK D13
JackB 3:8e16a8987166 48 #define PIN_MISO D12
JackB 3:8e16a8987166 49 #define PIN_MOSI D11
JackB 3:8e16a8987166 50 #define PIN_CS_TFT D10 // chip select pin
JackB 3:8e16a8987166 51 #define PIN_DC_TFT D9 // data/command select pin.
JackB 3:8e16a8987166 52 #define PIN_RESET_TFT D8
JackB 3:8e16a8987166 53 //#define PIN_BL_TFT D7
JackB 3:8e16a8987166 54 #define PIN_CS_SD D4
JackB 3:8e16a8987166 55
JackB 3:8e16a8987166 56 #define PORTRAIT 0
JackB 3:8e16a8987166 57 #define LANDSCAPE 1
JackB 3:8e16a8987166 58
JackB 3:8e16a8987166 59 #define PIN_SCL_FT6206 P0_28
JackB 3:8e16a8987166 60 #define PIN_SDA_FT6206 P0_27
JackB 3:8e16a8987166 61 #define PIN_INT_FT6206 D7
JackB 3:8e16a8987166 62
JackB 3:8e16a8987166 63 SPI_TFT_ILI9341 TFT(PIN_MOSI, PIN_MISO, PIN_SCLK, PIN_CS_TFT, PIN_RESET_TFT, PIN_DC_TFT, "TFT"); // mosi, miso, sclk, cs, reset, dc
JackB 3:8e16a8987166 64 FT6206 FT6206(PIN_SDA_FT6206, PIN_SCL_FT6206, PIN_INT_FT6206); // sda, scl, int
JackB 3:8e16a8987166 65
JackB 3:8e16a8987166 66 int main()
JackB 3:8e16a8987166 67 {
JackB 1:43274ec89d1a 68 while(1) {
JackB 7:3896a0daed43 69 TS_Point p;
JackB 7:3896a0daed43 70 if (FT6206.getTouchPoint(p)) {
JackB 8:b6e95d327cd3 71 X1 = X2;
JackB 8:b6e95d327cd3 72 Y1 = Y2;
JackB 8:b6e95d327cd3 73 X2 = p.x;
JackB 8:b6e95d327cd3 74 Y2 = p.y;
JackB 8:b6e95d327cd3 75 // printf("Touch %3d %3d\n", p.x, p.y);
JackB 8:b6e95d327cd3 76 if ((X1 > 0) && (Y1 > 0) && (X2 > 0) && (Y2 > 0)) {
JackB 8:b6e95d327cd3 77 TFT.line(X1, Y1, X2, Y2, RGB(255,128,255));
JackB 8:b6e95d327cd3 78 }
JackB 1:43274ec89d1a 79 }
JackB 1:43274ec89d1a 80 }
JackB 3:8e16a8987166 81 }
JackB 1:43274ec89d1a 82 */
JackB 0:d146e986a07f 83
JackB 0:d146e986a07f 84 #include "FT6206.h"
JackB 0:d146e986a07f 85
JackB 0:d146e986a07f 86 FT6206::FT6206(PinName sda, PinName scl, PinName interrupt) : m_i2c(sda, scl), m_interrupt(interrupt)
JackB 0:d146e986a07f 87 {
JackB 0:d146e986a07f 88 m_addr = (FT6206_ADDR << 1);
JackB 0:d146e986a07f 89 m_i2c.frequency(FT6206_I2C_FREQUENCY);
JackB 0:d146e986a07f 90 m_interrupt.mode(PullUp);
JackB 0:d146e986a07f 91 }
JackB 0:d146e986a07f 92
JackB 5:652684757b6b 93 FT6206::~FT6206()
JackB 5:652684757b6b 94 {
JackB 5:652684757b6b 95
JackB 5:652684757b6b 96 }
JackB 0:d146e986a07f 97
JackB 0:d146e986a07f 98 /**************************************************************************/
JackB 0:d146e986a07f 99 /*!
JackB 0:d146e986a07f 100 @brief Setups the HW
JackB 0:d146e986a07f 101 */
JackB 0:d146e986a07f 102 /**************************************************************************/
JackB 5:652684757b6b 103 bool FT6206::init(uint8_t threshhold) {
JackB 0:d146e986a07f 104 // change threshhold to be higher/lower
JackB 5:652684757b6b 105 writeRegister8(FT6206_REG_THRESHHOLD, FT6206_DEFAULT_THRESSHOLD);
JackB 0:d146e986a07f 106
JackB 0:d146e986a07f 107 if (readRegister8(FT6206_REG_VENDID) != 17)
JackB 0:d146e986a07f 108 return false;
JackB 0:d146e986a07f 109
JackB 0:d146e986a07f 110 if (readRegister8(FT6206_REG_CHIPID) != 6)
JackB 0:d146e986a07f 111 return false;
JackB 0:d146e986a07f 112 /*
JackB 0:d146e986a07f 113 printf("Vend ID: %d\n", readRegister8(FT6206_REG_VENDID));
JackB 0:d146e986a07f 114 printf("Chip ID: %d\n", readRegister8(FT6206_REG_CHIPID));
JackB 0:d146e986a07f 115 printf("Firm V: %d\n", readRegister8(FT6206_REG_FIRMVERS));
JackB 0:d146e986a07f 116 printf("Rate Hz: %d\n", readRegister8(FT6206_REG_POINTRATE));
JackB 0:d146e986a07f 117 printf("Thresh: %d\n", readRegister8(FT6206_REG_THRESHHOLD));
JackB 0:d146e986a07f 118 */
JackB 0:d146e986a07f 119 // dump all registers
JackB 0:d146e986a07f 120 /*
JackB 0:d146e986a07f 121 for (int16_t i=0; i<0x20; i++) {
JackB 0:d146e986a07f 122 printf("I2C $%02x = 0x %02x\n", i, readRegister8(i));
JackB 0:d146e986a07f 123 }
JackB 0:d146e986a07f 124 */
JackB 0:d146e986a07f 125 return true;
JackB 0:d146e986a07f 126 }
JackB 0:d146e986a07f 127
JackB 0:d146e986a07f 128 bool FT6206::touched(void) {
JackB 0:d146e986a07f 129 uint8_t n = readRegister8(FT6206_REG_NUMTOUCHES);
JackB 0:d146e986a07f 130 if ((n == 1) || (n == 2))
JackB 0:d146e986a07f 131 return true;
JackB 0:d146e986a07f 132 return false;
JackB 0:d146e986a07f 133 }
JackB 0:d146e986a07f 134
JackB 6:eb7a74dc809f 135 bool FT6206::getTouchPoint(TS_Point &p) {
JackB 6:eb7a74dc809f 136 if (dataReceived()) {
JackB 6:eb7a74dc809f 137 // Retrieve a point
JackB 6:eb7a74dc809f 138 p = getPoint();
JackB 6:eb7a74dc809f 139 return true;
JackB 6:eb7a74dc809f 140 }
JackB 6:eb7a74dc809f 141 return false;
JackB 6:eb7a74dc809f 142 }
JackB 6:eb7a74dc809f 143
JackB 0:d146e986a07f 144 /*****************************/
JackB 0:d146e986a07f 145
JackB 0:d146e986a07f 146 void FT6206::readData(uint16_t *x, uint16_t *y) {
JackB 0:d146e986a07f 147 char i2cdat[16];
JackB 0:d146e986a07f 148
JackB 0:d146e986a07f 149 m_i2c.write(m_addr, 0x00, 1);
JackB 0:d146e986a07f 150 m_i2c.read(m_addr, i2cdat, 16);
JackB 0:d146e986a07f 151
JackB 0:d146e986a07f 152 /*
JackB 0:d146e986a07f 153 for (int16_t i=0; i<0x20; i++) {
JackB 0:d146e986a07f 154 printf("I2C %02x = %02x\n", i, i2cdat[i]);;
JackB 0:d146e986a07f 155 }
JackB 0:d146e986a07f 156 */
JackB 0:d146e986a07f 157
JackB 0:d146e986a07f 158 touches = i2cdat[0x02];
JackB 0:d146e986a07f 159
JackB 0:d146e986a07f 160 // printf("touches: %d\n", touches);
JackB 0:d146e986a07f 161 if (touches > 2) {
JackB 0:d146e986a07f 162 touches = 0;
JackB 0:d146e986a07f 163 *x = *y = 0;
JackB 0:d146e986a07f 164 }
JackB 0:d146e986a07f 165 if (touches == 0) {
JackB 0:d146e986a07f 166 *x = *y = 0;
JackB 0:d146e986a07f 167 return;
JackB 0:d146e986a07f 168 }
JackB 0:d146e986a07f 169
JackB 0:d146e986a07f 170 /*
JackB 0:d146e986a07f 171 if (touches == 2) Serial.print('2');
JackB 0:d146e986a07f 172 for (uint8_t i=0; i<16; i++) {
JackB 0:d146e986a07f 173 printf("%02x ", i2cdat[i]);
JackB 0:d146e986a07f 174 }
JackB 0:d146e986a07f 175 printf("\n");
JackB 0:d146e986a07f 176 */
JackB 0:d146e986a07f 177
JackB 0:d146e986a07f 178 /*
JackB 0:d146e986a07f 179 printf("\n");
JackB 0:d146e986a07f 180 if (i2cdat[0x01] != 0x00) {
JackB 0:d146e986a07f 181 printf("Gesture #%d\n", i2cdat[0x01]);
JackB 0:d146e986a07f 182 }
JackB 0:d146e986a07f 183 */
JackB 0:d146e986a07f 184
JackB 0:d146e986a07f 185 //printf("# Touches: %d", touches);
JackB 0:d146e986a07f 186 for (uint8_t i=0; i<2; i++) {
JackB 0:d146e986a07f 187 touchY[i] = i2cdat[0x03 + i*6] & 0x0F;
JackB 0:d146e986a07f 188 touchY[i] <<= 8;
JackB 0:d146e986a07f 189 touchY[i] |= i2cdat[0x04 + i*6];
JackB 0:d146e986a07f 190 touchX[i] = i2cdat[0x05 + i*6] & 0x0F;
JackB 0:d146e986a07f 191 touchX[i] <<= 8;
JackB 0:d146e986a07f 192 touchX[i] |= i2cdat[0x06 + i*6];
JackB 0:d146e986a07f 193 touchID[i] = i2cdat[0x05 + i*6] >> 4;
JackB 0:d146e986a07f 194 }
JackB 0:d146e986a07f 195 /*
JackB 0:d146e986a07f 196 for (uint8_t i=0; i<touches; i++) {
JackB 0:d146e986a07f 197 printf("ID #%d (%d, %d", touchID[i], touchX[i], touchY[i]);
JackB 0:d146e986a07f 198 printf(")\n");
JackB 0:d146e986a07f 199 }
JackB 0:d146e986a07f 200 */
JackB 0:d146e986a07f 201 *x = ILI9341_TFTWIDTH - touchX[0];
JackB 0:d146e986a07f 202 *y = touchY[0];
JackB 0:d146e986a07f 203 }
JackB 0:d146e986a07f 204
JackB 0:d146e986a07f 205 TS_Point FT6206::getPoint(void) {
JackB 0:d146e986a07f 206 uint16_t x, y;
JackB 0:d146e986a07f 207 readData(&x, &y);
JackB 0:d146e986a07f 208 return TS_Point(x, y, 1);
JackB 0:d146e986a07f 209 }
JackB 0:d146e986a07f 210
JackB 0:d146e986a07f 211 char FT6206::readRegister8(char reg) {
JackB 0:d146e986a07f 212 char val;
JackB 0:d146e986a07f 213 m_i2c.write(m_addr, &reg, 1);
JackB 0:d146e986a07f 214 m_i2c.read(m_addr, &val, 1);
JackB 0:d146e986a07f 215 return val;
JackB 0:d146e986a07f 216 }
JackB 0:d146e986a07f 217
JackB 0:d146e986a07f 218 void FT6206::writeRegister8(char reg, char val) {
JackB 0:d146e986a07f 219 char data[2];
JackB 0:d146e986a07f 220 data[0] = reg;
JackB 0:d146e986a07f 221 data[1] = val;
JackB 0:d146e986a07f 222 m_i2c.write((int)FT6206_ADDR, data, 2);
JackB 0:d146e986a07f 223 }
JackB 0:d146e986a07f 224
JackB 0:d146e986a07f 225 char FT6206::dataReceived(void) {
JackB 0:d146e986a07f 226 return !m_interrupt;
JackB 0:d146e986a07f 227 }
JackB 0:d146e986a07f 228
JackB 0:d146e986a07f 229 /****************/
JackB 0:d146e986a07f 230
JackB 0:d146e986a07f 231 TS_Point::TS_Point(void) {
JackB 0:d146e986a07f 232 x = y = 0;
JackB 0:d146e986a07f 233 }
JackB 0:d146e986a07f 234
JackB 0:d146e986a07f 235 TS_Point::TS_Point(int16_t x0, int16_t y0, int16_t z0) {
JackB 0:d146e986a07f 236 x = x0;
JackB 0:d146e986a07f 237 y = y0;
JackB 0:d146e986a07f 238 z = z0;
JackB 0:d146e986a07f 239 }
JackB 0:d146e986a07f 240
JackB 0:d146e986a07f 241 bool TS_Point::operator==(TS_Point p1) {
JackB 0:d146e986a07f 242 return ((p1.x == x) && (p1.y == y) && (p1.z == z));
JackB 0:d146e986a07f 243 }
JackB 0:d146e986a07f 244
JackB 0:d146e986a07f 245 bool TS_Point::operator!=(TS_Point p1) {
JackB 0:d146e986a07f 246 return ((p1.x != x) || (p1.y != y) || (p1.z != z));
JackB 0:d146e986a07f 247 }