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@3:8e16a8987166, 2015-03-23 (annotated)

Committer:
JackB
Date:
Mon Mar 23 19:59:37 2015 +0000
Revision:
3:8e16a8987166
Parent:
2:35e21af6733c
Child:
4:b9ff3c020e7f
Usage comment improved

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JackB 0:d146e986a07f 1 /***************************************************
JackB 0:d146e986a07f 2 This is a library for the Adafruit Capacitive Touch Screens
JackB 0:d146e986a07f 3
JackB 0:d146e986a07f 4 ----> http://www.adafruit.com/products/1947
JackB 0:d146e986a07f 5
JackB 0:d146e986a07f 6 Check out the links above for our tutorials and wiring diagrams
JackB 0:d146e986a07f 7 This chipset uses I2C to communicate
JackB 0:d146e986a07f 8
JackB 0:d146e986a07f 9 Adafruit invests time and resources providing this open source code,
JackB 0:d146e986a07f 10 please support Adafruit and open-source hardware by purchasing
JackB 0:d146e986a07f 11 products from Adafruit!
JackB 0:d146e986a07f 12
JackB 0:d146e986a07f 13 Written by Limor Fried/Ladyada for Adafruit Industries.
JackB 0:d146e986a07f 14 MIT license, all text above must be included in any redistribution
JackB 0:d146e986a07f 15 ****************************************************/
JackB 1:43274ec89d1a 16 /*
JackB 2:35e21af6733c 17 Usage:
JackB 1:43274ec89d1a 18
JackB 3:8e16a8987166 19 #include "mbed.h"
JackB 3:8e16a8987166 20 #include "SPI_TFT_ILI9341.h"
JackB 3:8e16a8987166 21 #include "FT6206.h"
JackB 3:8e16a8987166 22 #include "Arial12x12.h"
JackB 3:8e16a8987166 23
JackB 3:8e16a8987166 24 #define PIN_XP A3
JackB 3:8e16a8987166 25 #define PIN_XM A1
JackB 3:8e16a8987166 26 #define PIN_YP A2
JackB 3:8e16a8987166 27 #define PIN_YM A0
JackB 3:8e16a8987166 28 #define PIN_SCLK D13
JackB 3:8e16a8987166 29 #define PIN_MISO D12
JackB 3:8e16a8987166 30 #define PIN_MOSI D11
JackB 3:8e16a8987166 31 #define PIN_CS_TFT D10 // chip select pin
JackB 3:8e16a8987166 32 #define PIN_DC_TFT D9 // data/command select pin.
JackB 3:8e16a8987166 33 #define PIN_RESET_TFT D8
JackB 3:8e16a8987166 34 //#define PIN_BL_TFT D7
JackB 3:8e16a8987166 35 #define PIN_CS_SD D4
JackB 3:8e16a8987166 36
JackB 3:8e16a8987166 37 #define PORTRAIT 0
JackB 3:8e16a8987166 38 #define LANDSCAPE 1
JackB 3:8e16a8987166 39
JackB 3:8e16a8987166 40 #define PIN_SCL_FT6206 P0_28
JackB 3:8e16a8987166 41 #define PIN_SDA_FT6206 P0_27
JackB 3:8e16a8987166 42 #define PIN_INT_FT6206 D7
JackB 3:8e16a8987166 43
JackB 3:8e16a8987166 44 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 45 FT6206 FT6206(PIN_SDA_FT6206, PIN_SCL_FT6206, PIN_INT_FT6206); // sda, scl, int
JackB 3:8e16a8987166 46
JackB 3:8e16a8987166 47 int main()
JackB 3:8e16a8987166 48 {
JackB 1:43274ec89d1a 49 while(1) {
JackB 1:43274ec89d1a 50 // if (FT6206.touched()) {
JackB 1:43274ec89d1a 51 if (FT6206.dataReceived()) {
JackB 1:43274ec89d1a 52 // Retrieve a point
JackB 1:43274ec89d1a 53 TS_Point p = FT6206.getPoint();
JackB 1:43274ec89d1a 54 printf("Touch %3d %3d\n", p.x, p.y);
JackB 1:43274ec89d1a 55 }
JackB 1:43274ec89d1a 56 }
JackB 3:8e16a8987166 57 }
JackB 1:43274ec89d1a 58 */
JackB 0:d146e986a07f 59
JackB 0:d146e986a07f 60 #include "FT6206.h"
JackB 0:d146e986a07f 61
JackB 0:d146e986a07f 62 FT6206::FT6206(PinName sda, PinName scl, PinName interrupt) : m_i2c(sda, scl), m_interrupt(interrupt)
JackB 0:d146e986a07f 63 {
JackB 0:d146e986a07f 64 m_addr = (FT6206_ADDR << 1);
JackB 0:d146e986a07f 65 m_i2c.frequency(FT6206_I2C_FREQUENCY);
JackB 0:d146e986a07f 66 m_interrupt.mode(PullUp);
JackB 0:d146e986a07f 67 }
JackB 0:d146e986a07f 68
JackB 0:d146e986a07f 69
JackB 0:d146e986a07f 70 /**************************************************************************/
JackB 0:d146e986a07f 71 /*!
JackB 0:d146e986a07f 72 @brief Setups the HW
JackB 0:d146e986a07f 73 */
JackB 0:d146e986a07f 74 /**************************************************************************/
JackB 0:d146e986a07f 75 bool FT6206::begin(uint8_t threshhold) {
JackB 0:d146e986a07f 76 //// Wire.begin();
JackB 0:d146e986a07f 77
JackB 0:d146e986a07f 78 // change threshhold to be higher/lower
JackB 0:d146e986a07f 79 writeRegister8(FT6206_REG_THRESHHOLD, threshhold);
JackB 0:d146e986a07f 80
JackB 0:d146e986a07f 81 if (readRegister8(FT6206_REG_VENDID) != 17)
JackB 0:d146e986a07f 82 return false;
JackB 0:d146e986a07f 83
JackB 0:d146e986a07f 84 if (readRegister8(FT6206_REG_CHIPID) != 6)
JackB 0:d146e986a07f 85 return false;
JackB 0:d146e986a07f 86 /*
JackB 0:d146e986a07f 87 printf("Vend ID: %d\n", readRegister8(FT6206_REG_VENDID));
JackB 0:d146e986a07f 88 printf("Chip ID: %d\n", readRegister8(FT6206_REG_CHIPID));
JackB 0:d146e986a07f 89 printf("Firm V: %d\n", readRegister8(FT6206_REG_FIRMVERS));
JackB 0:d146e986a07f 90 printf("Rate Hz: %d\n", readRegister8(FT6206_REG_POINTRATE));
JackB 0:d146e986a07f 91 printf("Thresh: %d\n", readRegister8(FT6206_REG_THRESHHOLD));
JackB 0:d146e986a07f 92 */
JackB 0:d146e986a07f 93 // dump all registers
JackB 0:d146e986a07f 94 /*
JackB 0:d146e986a07f 95 for (int16_t i=0; i<0x20; i++) {
JackB 0:d146e986a07f 96 printf("I2C $%02x = 0x %02x\n", i, readRegister8(i));
JackB 0:d146e986a07f 97 }
JackB 0:d146e986a07f 98 */
JackB 0:d146e986a07f 99 return true;
JackB 0:d146e986a07f 100 }
JackB 0:d146e986a07f 101
JackB 0:d146e986a07f 102 bool FT6206::touched(void) {
JackB 0:d146e986a07f 103 uint8_t n = readRegister8(FT6206_REG_NUMTOUCHES);
JackB 0:d146e986a07f 104 if ((n == 1) || (n == 2))
JackB 0:d146e986a07f 105 return true;
JackB 0:d146e986a07f 106 return false;
JackB 0:d146e986a07f 107 }
JackB 0:d146e986a07f 108
JackB 0:d146e986a07f 109 /*****************************/
JackB 0:d146e986a07f 110
JackB 0:d146e986a07f 111 void FT6206::readData(uint16_t *x, uint16_t *y) {
JackB 0:d146e986a07f 112 char i2cdat[16];
JackB 0:d146e986a07f 113
JackB 0:d146e986a07f 114 m_i2c.write(m_addr, 0x00, 1);
JackB 0:d146e986a07f 115 m_i2c.read(m_addr, i2cdat, 16);
JackB 0:d146e986a07f 116
JackB 0:d146e986a07f 117 /*
JackB 0:d146e986a07f 118 for (int16_t i=0; i<0x20; i++) {
JackB 0:d146e986a07f 119 printf("I2C %02x = %02x\n", i, i2cdat[i]);;
JackB 0:d146e986a07f 120 }
JackB 0:d146e986a07f 121 */
JackB 0:d146e986a07f 122
JackB 0:d146e986a07f 123 touches = i2cdat[0x02];
JackB 0:d146e986a07f 124
JackB 0:d146e986a07f 125 // printf("touches: %d\n", touches);
JackB 0:d146e986a07f 126 if (touches > 2) {
JackB 0:d146e986a07f 127 touches = 0;
JackB 0:d146e986a07f 128 *x = *y = 0;
JackB 0:d146e986a07f 129 }
JackB 0:d146e986a07f 130 if (touches == 0) {
JackB 0:d146e986a07f 131 *x = *y = 0;
JackB 0:d146e986a07f 132 return;
JackB 0:d146e986a07f 133 }
JackB 0:d146e986a07f 134
JackB 0:d146e986a07f 135 /*
JackB 0:d146e986a07f 136 if (touches == 2) Serial.print('2');
JackB 0:d146e986a07f 137 for (uint8_t i=0; i<16; i++) {
JackB 0:d146e986a07f 138 printf("%02x ", i2cdat[i]);
JackB 0:d146e986a07f 139 }
JackB 0:d146e986a07f 140 printf("\n");
JackB 0:d146e986a07f 141 */
JackB 0:d146e986a07f 142
JackB 0:d146e986a07f 143 /*
JackB 0:d146e986a07f 144 printf("\n");
JackB 0:d146e986a07f 145 if (i2cdat[0x01] != 0x00) {
JackB 0:d146e986a07f 146 printf("Gesture #%d\n", i2cdat[0x01]);
JackB 0:d146e986a07f 147 }
JackB 0:d146e986a07f 148 */
JackB 0:d146e986a07f 149
JackB 0:d146e986a07f 150 //printf("# Touches: %d", touches);
JackB 0:d146e986a07f 151 for (uint8_t i=0; i<2; i++) {
JackB 0:d146e986a07f 152 touchY[i] = i2cdat[0x03 + i*6] & 0x0F;
JackB 0:d146e986a07f 153 touchY[i] <<= 8;
JackB 0:d146e986a07f 154 touchY[i] |= i2cdat[0x04 + i*6];
JackB 0:d146e986a07f 155 touchX[i] = i2cdat[0x05 + i*6] & 0x0F;
JackB 0:d146e986a07f 156 touchX[i] <<= 8;
JackB 0:d146e986a07f 157 touchX[i] |= i2cdat[0x06 + i*6];
JackB 0:d146e986a07f 158 touchID[i] = i2cdat[0x05 + i*6] >> 4;
JackB 0:d146e986a07f 159 }
JackB 0:d146e986a07f 160 /*
JackB 0:d146e986a07f 161 for (uint8_t i=0; i<touches; i++) {
JackB 0:d146e986a07f 162 printf("ID #%d (%d, %d", touchID[i], touchX[i], touchY[i]);
JackB 0:d146e986a07f 163 printf(")\n");
JackB 0:d146e986a07f 164 }
JackB 0:d146e986a07f 165 */
JackB 0:d146e986a07f 166 *x = ILI9341_TFTWIDTH - touchX[0];
JackB 0:d146e986a07f 167 *y = touchY[0];
JackB 0:d146e986a07f 168 }
JackB 0:d146e986a07f 169
JackB 0:d146e986a07f 170 TS_Point FT6206::getPoint(void) {
JackB 0:d146e986a07f 171 uint16_t x, y;
JackB 0:d146e986a07f 172 readData(&x, &y);
JackB 0:d146e986a07f 173 return TS_Point(x, y, 1);
JackB 0:d146e986a07f 174 }
JackB 0:d146e986a07f 175
JackB 0:d146e986a07f 176 char FT6206::readRegister8(char reg) {
JackB 0:d146e986a07f 177 char val;
JackB 0:d146e986a07f 178 m_i2c.write(m_addr, &reg, 1);
JackB 0:d146e986a07f 179 m_i2c.read(m_addr, &val, 1);
JackB 0:d146e986a07f 180 return val;
JackB 0:d146e986a07f 181 }
JackB 0:d146e986a07f 182
JackB 0:d146e986a07f 183 void FT6206::writeRegister8(char reg, char val) {
JackB 0:d146e986a07f 184 char data[2];
JackB 0:d146e986a07f 185 data[0] = reg;
JackB 0:d146e986a07f 186 data[1] = val;
JackB 0:d146e986a07f 187 m_i2c.write((int)FT6206_ADDR, data, 2);
JackB 0:d146e986a07f 188 }
JackB 0:d146e986a07f 189
JackB 0:d146e986a07f 190 char FT6206::dataReceived(void) {
JackB 0:d146e986a07f 191 return !m_interrupt;
JackB 0:d146e986a07f 192 }
JackB 0:d146e986a07f 193
JackB 0:d146e986a07f 194 /****************/
JackB 0:d146e986a07f 195
JackB 0:d146e986a07f 196 TS_Point::TS_Point(void) {
JackB 0:d146e986a07f 197 x = y = 0;
JackB 0:d146e986a07f 198 }
JackB 0:d146e986a07f 199
JackB 0:d146e986a07f 200 TS_Point::TS_Point(int16_t x0, int16_t y0, int16_t z0) {
JackB 0:d146e986a07f 201 x = x0;
JackB 0:d146e986a07f 202 y = y0;
JackB 0:d146e986a07f 203 z = z0;
JackB 0:d146e986a07f 204 }
JackB 0:d146e986a07f 205
JackB 0:d146e986a07f 206 bool TS_Point::operator==(TS_Point p1) {
JackB 0:d146e986a07f 207 return ((p1.x == x) && (p1.y == y) && (p1.z == z));
JackB 0:d146e986a07f 208 }
JackB 0:d146e986a07f 209
JackB 0:d146e986a07f 210 bool TS_Point::operator!=(TS_Point p1) {
JackB 0:d146e986a07f 211 return ((p1.x != x) || (p1.y != y) || (p1.z != z));
JackB 0:d146e986a07f 212 }