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@4:b9ff3c020e7f, 2015-03-23 (annotated)

Committer:
JackB
Date:
Mon Mar 23 22:02:01 2015 +0000
Revision:
4:b9ff3c020e7f
Parent:
3:8e16a8987166
Child:
5:652684757b6b
Comment

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 1:43274ec89d1a 69 // if (FT6206.touched()) {
JackB 1:43274ec89d1a 70 if (FT6206.dataReceived()) {
JackB 1:43274ec89d1a 71 // Retrieve a point
JackB 1:43274ec89d1a 72 TS_Point p = FT6206.getPoint();
JackB 1:43274ec89d1a 73 printf("Touch %3d %3d\n", p.x, p.y);
JackB 1:43274ec89d1a 74 }
JackB 1:43274ec89d1a 75 }
JackB 3:8e16a8987166 76 }
JackB 1:43274ec89d1a 77 */
JackB 0:d146e986a07f 78
JackB 0:d146e986a07f 79 #include "FT6206.h"
JackB 0:d146e986a07f 80
JackB 0:d146e986a07f 81 FT6206::FT6206(PinName sda, PinName scl, PinName interrupt) : m_i2c(sda, scl), m_interrupt(interrupt)
JackB 0:d146e986a07f 82 {
JackB 0:d146e986a07f 83 m_addr = (FT6206_ADDR << 1);
JackB 0:d146e986a07f 84 m_i2c.frequency(FT6206_I2C_FREQUENCY);
JackB 0:d146e986a07f 85 m_interrupt.mode(PullUp);
JackB 0:d146e986a07f 86 }
JackB 0:d146e986a07f 87
JackB 0:d146e986a07f 88
JackB 0:d146e986a07f 89 /**************************************************************************/
JackB 0:d146e986a07f 90 /*!
JackB 0:d146e986a07f 91 @brief Setups the HW
JackB 0:d146e986a07f 92 */
JackB 0:d146e986a07f 93 /**************************************************************************/
JackB 0:d146e986a07f 94 bool FT6206::begin(uint8_t threshhold) {
JackB 0:d146e986a07f 95 // change threshhold to be higher/lower
JackB 0:d146e986a07f 96 writeRegister8(FT6206_REG_THRESHHOLD, threshhold);
JackB 0:d146e986a07f 97
JackB 0:d146e986a07f 98 if (readRegister8(FT6206_REG_VENDID) != 17)
JackB 0:d146e986a07f 99 return false;
JackB 0:d146e986a07f 100
JackB 0:d146e986a07f 101 if (readRegister8(FT6206_REG_CHIPID) != 6)
JackB 0:d146e986a07f 102 return false;
JackB 0:d146e986a07f 103 /*
JackB 0:d146e986a07f 104 printf("Vend ID: %d\n", readRegister8(FT6206_REG_VENDID));
JackB 0:d146e986a07f 105 printf("Chip ID: %d\n", readRegister8(FT6206_REG_CHIPID));
JackB 0:d146e986a07f 106 printf("Firm V: %d\n", readRegister8(FT6206_REG_FIRMVERS));
JackB 0:d146e986a07f 107 printf("Rate Hz: %d\n", readRegister8(FT6206_REG_POINTRATE));
JackB 0:d146e986a07f 108 printf("Thresh: %d\n", readRegister8(FT6206_REG_THRESHHOLD));
JackB 0:d146e986a07f 109 */
JackB 0:d146e986a07f 110 // dump all registers
JackB 0:d146e986a07f 111 /*
JackB 0:d146e986a07f 112 for (int16_t i=0; i<0x20; i++) {
JackB 0:d146e986a07f 113 printf("I2C $%02x = 0x %02x\n", i, readRegister8(i));
JackB 0:d146e986a07f 114 }
JackB 0:d146e986a07f 115 */
JackB 0:d146e986a07f 116 return true;
JackB 0:d146e986a07f 117 }
JackB 0:d146e986a07f 118
JackB 0:d146e986a07f 119 bool FT6206::touched(void) {
JackB 0:d146e986a07f 120 uint8_t n = readRegister8(FT6206_REG_NUMTOUCHES);
JackB 0:d146e986a07f 121 if ((n == 1) || (n == 2))
JackB 0:d146e986a07f 122 return true;
JackB 0:d146e986a07f 123 return false;
JackB 0:d146e986a07f 124 }
JackB 0:d146e986a07f 125
JackB 0:d146e986a07f 126 /*****************************/
JackB 0:d146e986a07f 127
JackB 0:d146e986a07f 128 void FT6206::readData(uint16_t *x, uint16_t *y) {
JackB 0:d146e986a07f 129 char i2cdat[16];
JackB 0:d146e986a07f 130
JackB 0:d146e986a07f 131 m_i2c.write(m_addr, 0x00, 1);
JackB 0:d146e986a07f 132 m_i2c.read(m_addr, i2cdat, 16);
JackB 0:d146e986a07f 133
JackB 0:d146e986a07f 134 /*
JackB 0:d146e986a07f 135 for (int16_t i=0; i<0x20; i++) {
JackB 0:d146e986a07f 136 printf("I2C %02x = %02x\n", i, i2cdat[i]);;
JackB 0:d146e986a07f 137 }
JackB 0:d146e986a07f 138 */
JackB 0:d146e986a07f 139
JackB 0:d146e986a07f 140 touches = i2cdat[0x02];
JackB 0:d146e986a07f 141
JackB 0:d146e986a07f 142 // printf("touches: %d\n", touches);
JackB 0:d146e986a07f 143 if (touches > 2) {
JackB 0:d146e986a07f 144 touches = 0;
JackB 0:d146e986a07f 145 *x = *y = 0;
JackB 0:d146e986a07f 146 }
JackB 0:d146e986a07f 147 if (touches == 0) {
JackB 0:d146e986a07f 148 *x = *y = 0;
JackB 0:d146e986a07f 149 return;
JackB 0:d146e986a07f 150 }
JackB 0:d146e986a07f 151
JackB 0:d146e986a07f 152 /*
JackB 0:d146e986a07f 153 if (touches == 2) Serial.print('2');
JackB 0:d146e986a07f 154 for (uint8_t i=0; i<16; i++) {
JackB 0:d146e986a07f 155 printf("%02x ", i2cdat[i]);
JackB 0:d146e986a07f 156 }
JackB 0:d146e986a07f 157 printf("\n");
JackB 0:d146e986a07f 158 */
JackB 0:d146e986a07f 159
JackB 0:d146e986a07f 160 /*
JackB 0:d146e986a07f 161 printf("\n");
JackB 0:d146e986a07f 162 if (i2cdat[0x01] != 0x00) {
JackB 0:d146e986a07f 163 printf("Gesture #%d\n", i2cdat[0x01]);
JackB 0:d146e986a07f 164 }
JackB 0:d146e986a07f 165 */
JackB 0:d146e986a07f 166
JackB 0:d146e986a07f 167 //printf("# Touches: %d", touches);
JackB 0:d146e986a07f 168 for (uint8_t i=0; i<2; i++) {
JackB 0:d146e986a07f 169 touchY[i] = i2cdat[0x03 + i*6] & 0x0F;
JackB 0:d146e986a07f 170 touchY[i] <<= 8;
JackB 0:d146e986a07f 171 touchY[i] |= i2cdat[0x04 + i*6];
JackB 0:d146e986a07f 172 touchX[i] = i2cdat[0x05 + i*6] & 0x0F;
JackB 0:d146e986a07f 173 touchX[i] <<= 8;
JackB 0:d146e986a07f 174 touchX[i] |= i2cdat[0x06 + i*6];
JackB 0:d146e986a07f 175 touchID[i] = i2cdat[0x05 + i*6] >> 4;
JackB 0:d146e986a07f 176 }
JackB 0:d146e986a07f 177 /*
JackB 0:d146e986a07f 178 for (uint8_t i=0; i<touches; i++) {
JackB 0:d146e986a07f 179 printf("ID #%d (%d, %d", touchID[i], touchX[i], touchY[i]);
JackB 0:d146e986a07f 180 printf(")\n");
JackB 0:d146e986a07f 181 }
JackB 0:d146e986a07f 182 */
JackB 0:d146e986a07f 183 *x = ILI9341_TFTWIDTH - touchX[0];
JackB 0:d146e986a07f 184 *y = touchY[0];
JackB 0:d146e986a07f 185 }
JackB 0:d146e986a07f 186
JackB 0:d146e986a07f 187 TS_Point FT6206::getPoint(void) {
JackB 0:d146e986a07f 188 uint16_t x, y;
JackB 0:d146e986a07f 189 readData(&x, &y);
JackB 0:d146e986a07f 190 return TS_Point(x, y, 1);
JackB 0:d146e986a07f 191 }
JackB 0:d146e986a07f 192
JackB 0:d146e986a07f 193 char FT6206::readRegister8(char reg) {
JackB 0:d146e986a07f 194 char val;
JackB 0:d146e986a07f 195 m_i2c.write(m_addr, &reg, 1);
JackB 0:d146e986a07f 196 m_i2c.read(m_addr, &val, 1);
JackB 0:d146e986a07f 197 return val;
JackB 0:d146e986a07f 198 }
JackB 0:d146e986a07f 199
JackB 0:d146e986a07f 200 void FT6206::writeRegister8(char reg, char val) {
JackB 0:d146e986a07f 201 char data[2];
JackB 0:d146e986a07f 202 data[0] = reg;
JackB 0:d146e986a07f 203 data[1] = val;
JackB 0:d146e986a07f 204 m_i2c.write((int)FT6206_ADDR, data, 2);
JackB 0:d146e986a07f 205 }
JackB 0:d146e986a07f 206
JackB 0:d146e986a07f 207 char FT6206::dataReceived(void) {
JackB 0:d146e986a07f 208 return !m_interrupt;
JackB 0:d146e986a07f 209 }
JackB 0:d146e986a07f 210
JackB 0:d146e986a07f 211 /****************/
JackB 0:d146e986a07f 212
JackB 0:d146e986a07f 213 TS_Point::TS_Point(void) {
JackB 0:d146e986a07f 214 x = y = 0;
JackB 0:d146e986a07f 215 }
JackB 0:d146e986a07f 216
JackB 0:d146e986a07f 217 TS_Point::TS_Point(int16_t x0, int16_t y0, int16_t z0) {
JackB 0:d146e986a07f 218 x = x0;
JackB 0:d146e986a07f 219 y = y0;
JackB 0:d146e986a07f 220 z = z0;
JackB 0:d146e986a07f 221 }
JackB 0:d146e986a07f 222
JackB 0:d146e986a07f 223 bool TS_Point::operator==(TS_Point p1) {
JackB 0:d146e986a07f 224 return ((p1.x == x) && (p1.y == y) && (p1.z == z));
JackB 0:d146e986a07f 225 }
JackB 0:d146e986a07f 226
JackB 0:d146e986a07f 227 bool TS_Point::operator!=(TS_Point p1) {
JackB 0:d146e986a07f 228 return ((p1.x != x) || (p1.y != y) || (p1.z != z));
JackB 0:d146e986a07f 229 }