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@1:43274ec89d1a, 2015-03-23 (annotated)
- Committer:
- JackB
- Date:
- Mon Mar 23 19:54:30 2015 +0000
- Revision:
- 1:43274ec89d1a
- Parent:
- 0:d146e986a07f
- Child:
- 2:35e21af6733c
Usage comment added in cpp file
Who changed what in which revision?
User | Revision | Line number | New 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 | 1:43274ec89d1a | 17 | Ussage: |
JackB | 1:43274ec89d1a | 18 | |
JackB | 1:43274ec89d1a | 19 | while(1) { |
JackB | 1:43274ec89d1a | 20 | // if (FT6206.touched()) { |
JackB | 1:43274ec89d1a | 21 | if (FT6206.dataReceived()) { |
JackB | 1:43274ec89d1a | 22 | // Retrieve a point |
JackB | 1:43274ec89d1a | 23 | TS_Point p = FT6206.getPoint(); |
JackB | 1:43274ec89d1a | 24 | printf("Touch %3d %3d\n", p.x, p.y); |
JackB | 1:43274ec89d1a | 25 | } |
JackB | 1:43274ec89d1a | 26 | } |
JackB | 1:43274ec89d1a | 27 | */ |
JackB | 0:d146e986a07f | 28 | |
JackB | 0:d146e986a07f | 29 | #include "FT6206.h" |
JackB | 0:d146e986a07f | 30 | |
JackB | 0:d146e986a07f | 31 | FT6206::FT6206(PinName sda, PinName scl, PinName interrupt) : m_i2c(sda, scl), m_interrupt(interrupt) |
JackB | 0:d146e986a07f | 32 | { |
JackB | 0:d146e986a07f | 33 | m_addr = (FT6206_ADDR << 1); |
JackB | 0:d146e986a07f | 34 | m_i2c.frequency(FT6206_I2C_FREQUENCY); |
JackB | 0:d146e986a07f | 35 | m_interrupt.mode(PullUp); |
JackB | 0:d146e986a07f | 36 | } |
JackB | 0:d146e986a07f | 37 | |
JackB | 0:d146e986a07f | 38 | |
JackB | 0:d146e986a07f | 39 | /**************************************************************************/ |
JackB | 0:d146e986a07f | 40 | /*! |
JackB | 0:d146e986a07f | 41 | @brief Setups the HW |
JackB | 0:d146e986a07f | 42 | */ |
JackB | 0:d146e986a07f | 43 | /**************************************************************************/ |
JackB | 0:d146e986a07f | 44 | bool FT6206::begin(uint8_t threshhold) { |
JackB | 0:d146e986a07f | 45 | //// Wire.begin(); |
JackB | 0:d146e986a07f | 46 | |
JackB | 0:d146e986a07f | 47 | // change threshhold to be higher/lower |
JackB | 0:d146e986a07f | 48 | writeRegister8(FT6206_REG_THRESHHOLD, threshhold); |
JackB | 0:d146e986a07f | 49 | |
JackB | 0:d146e986a07f | 50 | if (readRegister8(FT6206_REG_VENDID) != 17) |
JackB | 0:d146e986a07f | 51 | return false; |
JackB | 0:d146e986a07f | 52 | |
JackB | 0:d146e986a07f | 53 | if (readRegister8(FT6206_REG_CHIPID) != 6) |
JackB | 0:d146e986a07f | 54 | return false; |
JackB | 0:d146e986a07f | 55 | /* |
JackB | 0:d146e986a07f | 56 | printf("Vend ID: %d\n", readRegister8(FT6206_REG_VENDID)); |
JackB | 0:d146e986a07f | 57 | printf("Chip ID: %d\n", readRegister8(FT6206_REG_CHIPID)); |
JackB | 0:d146e986a07f | 58 | printf("Firm V: %d\n", readRegister8(FT6206_REG_FIRMVERS)); |
JackB | 0:d146e986a07f | 59 | printf("Rate Hz: %d\n", readRegister8(FT6206_REG_POINTRATE)); |
JackB | 0:d146e986a07f | 60 | printf("Thresh: %d\n", readRegister8(FT6206_REG_THRESHHOLD)); |
JackB | 0:d146e986a07f | 61 | */ |
JackB | 0:d146e986a07f | 62 | // dump all registers |
JackB | 0:d146e986a07f | 63 | /* |
JackB | 0:d146e986a07f | 64 | for (int16_t i=0; i<0x20; i++) { |
JackB | 0:d146e986a07f | 65 | printf("I2C $%02x = 0x %02x\n", i, readRegister8(i)); |
JackB | 0:d146e986a07f | 66 | } |
JackB | 0:d146e986a07f | 67 | */ |
JackB | 0:d146e986a07f | 68 | return true; |
JackB | 0:d146e986a07f | 69 | } |
JackB | 0:d146e986a07f | 70 | |
JackB | 0:d146e986a07f | 71 | bool FT6206::touched(void) { |
JackB | 0:d146e986a07f | 72 | uint8_t n = readRegister8(FT6206_REG_NUMTOUCHES); |
JackB | 0:d146e986a07f | 73 | if ((n == 1) || (n == 2)) |
JackB | 0:d146e986a07f | 74 | return true; |
JackB | 0:d146e986a07f | 75 | return false; |
JackB | 0:d146e986a07f | 76 | } |
JackB | 0:d146e986a07f | 77 | |
JackB | 0:d146e986a07f | 78 | /*****************************/ |
JackB | 0:d146e986a07f | 79 | |
JackB | 0:d146e986a07f | 80 | void FT6206::readData(uint16_t *x, uint16_t *y) { |
JackB | 0:d146e986a07f | 81 | char i2cdat[16]; |
JackB | 0:d146e986a07f | 82 | |
JackB | 0:d146e986a07f | 83 | m_i2c.write(m_addr, 0x00, 1); |
JackB | 0:d146e986a07f | 84 | m_i2c.read(m_addr, i2cdat, 16); |
JackB | 0:d146e986a07f | 85 | |
JackB | 0:d146e986a07f | 86 | /* |
JackB | 0:d146e986a07f | 87 | for (int16_t i=0; i<0x20; i++) { |
JackB | 0:d146e986a07f | 88 | printf("I2C %02x = %02x\n", i, i2cdat[i]);; |
JackB | 0:d146e986a07f | 89 | } |
JackB | 0:d146e986a07f | 90 | */ |
JackB | 0:d146e986a07f | 91 | |
JackB | 0:d146e986a07f | 92 | touches = i2cdat[0x02]; |
JackB | 0:d146e986a07f | 93 | |
JackB | 0:d146e986a07f | 94 | // printf("touches: %d\n", touches); |
JackB | 0:d146e986a07f | 95 | if (touches > 2) { |
JackB | 0:d146e986a07f | 96 | touches = 0; |
JackB | 0:d146e986a07f | 97 | *x = *y = 0; |
JackB | 0:d146e986a07f | 98 | } |
JackB | 0:d146e986a07f | 99 | if (touches == 0) { |
JackB | 0:d146e986a07f | 100 | *x = *y = 0; |
JackB | 0:d146e986a07f | 101 | return; |
JackB | 0:d146e986a07f | 102 | } |
JackB | 0:d146e986a07f | 103 | |
JackB | 0:d146e986a07f | 104 | /* |
JackB | 0:d146e986a07f | 105 | if (touches == 2) Serial.print('2'); |
JackB | 0:d146e986a07f | 106 | for (uint8_t i=0; i<16; i++) { |
JackB | 0:d146e986a07f | 107 | printf("%02x ", i2cdat[i]); |
JackB | 0:d146e986a07f | 108 | } |
JackB | 0:d146e986a07f | 109 | printf("\n"); |
JackB | 0:d146e986a07f | 110 | */ |
JackB | 0:d146e986a07f | 111 | |
JackB | 0:d146e986a07f | 112 | /* |
JackB | 0:d146e986a07f | 113 | printf("\n"); |
JackB | 0:d146e986a07f | 114 | if (i2cdat[0x01] != 0x00) { |
JackB | 0:d146e986a07f | 115 | printf("Gesture #%d\n", i2cdat[0x01]); |
JackB | 0:d146e986a07f | 116 | } |
JackB | 0:d146e986a07f | 117 | */ |
JackB | 0:d146e986a07f | 118 | |
JackB | 0:d146e986a07f | 119 | //printf("# Touches: %d", touches); |
JackB | 0:d146e986a07f | 120 | for (uint8_t i=0; i<2; i++) { |
JackB | 0:d146e986a07f | 121 | touchY[i] = i2cdat[0x03 + i*6] & 0x0F; |
JackB | 0:d146e986a07f | 122 | touchY[i] <<= 8; |
JackB | 0:d146e986a07f | 123 | touchY[i] |= i2cdat[0x04 + i*6]; |
JackB | 0:d146e986a07f | 124 | touchX[i] = i2cdat[0x05 + i*6] & 0x0F; |
JackB | 0:d146e986a07f | 125 | touchX[i] <<= 8; |
JackB | 0:d146e986a07f | 126 | touchX[i] |= i2cdat[0x06 + i*6]; |
JackB | 0:d146e986a07f | 127 | touchID[i] = i2cdat[0x05 + i*6] >> 4; |
JackB | 0:d146e986a07f | 128 | } |
JackB | 0:d146e986a07f | 129 | /* |
JackB | 0:d146e986a07f | 130 | for (uint8_t i=0; i<touches; i++) { |
JackB | 0:d146e986a07f | 131 | printf("ID #%d (%d, %d", touchID[i], touchX[i], touchY[i]); |
JackB | 0:d146e986a07f | 132 | printf(")\n"); |
JackB | 0:d146e986a07f | 133 | } |
JackB | 0:d146e986a07f | 134 | */ |
JackB | 0:d146e986a07f | 135 | *x = ILI9341_TFTWIDTH - touchX[0]; |
JackB | 0:d146e986a07f | 136 | *y = touchY[0]; |
JackB | 0:d146e986a07f | 137 | } |
JackB | 0:d146e986a07f | 138 | |
JackB | 0:d146e986a07f | 139 | TS_Point FT6206::getPoint(void) { |
JackB | 0:d146e986a07f | 140 | uint16_t x, y; |
JackB | 0:d146e986a07f | 141 | readData(&x, &y); |
JackB | 0:d146e986a07f | 142 | return TS_Point(x, y, 1); |
JackB | 0:d146e986a07f | 143 | } |
JackB | 0:d146e986a07f | 144 | |
JackB | 0:d146e986a07f | 145 | char FT6206::readRegister8(char reg) { |
JackB | 0:d146e986a07f | 146 | char val; |
JackB | 0:d146e986a07f | 147 | m_i2c.write(m_addr, ®, 1); |
JackB | 0:d146e986a07f | 148 | m_i2c.read(m_addr, &val, 1); |
JackB | 0:d146e986a07f | 149 | return val; |
JackB | 0:d146e986a07f | 150 | } |
JackB | 0:d146e986a07f | 151 | |
JackB | 0:d146e986a07f | 152 | void FT6206::writeRegister8(char reg, char val) { |
JackB | 0:d146e986a07f | 153 | char data[2]; |
JackB | 0:d146e986a07f | 154 | data[0] = reg; |
JackB | 0:d146e986a07f | 155 | data[1] = val; |
JackB | 0:d146e986a07f | 156 | m_i2c.write((int)FT6206_ADDR, data, 2); |
JackB | 0:d146e986a07f | 157 | } |
JackB | 0:d146e986a07f | 158 | |
JackB | 0:d146e986a07f | 159 | char FT6206::dataReceived(void) { |
JackB | 0:d146e986a07f | 160 | return !m_interrupt; |
JackB | 0:d146e986a07f | 161 | } |
JackB | 0:d146e986a07f | 162 | |
JackB | 0:d146e986a07f | 163 | /****************/ |
JackB | 0:d146e986a07f | 164 | |
JackB | 0:d146e986a07f | 165 | TS_Point::TS_Point(void) { |
JackB | 0:d146e986a07f | 166 | x = y = 0; |
JackB | 0:d146e986a07f | 167 | } |
JackB | 0:d146e986a07f | 168 | |
JackB | 0:d146e986a07f | 169 | TS_Point::TS_Point(int16_t x0, int16_t y0, int16_t z0) { |
JackB | 0:d146e986a07f | 170 | x = x0; |
JackB | 0:d146e986a07f | 171 | y = y0; |
JackB | 0:d146e986a07f | 172 | z = z0; |
JackB | 0:d146e986a07f | 173 | } |
JackB | 0:d146e986a07f | 174 | |
JackB | 0:d146e986a07f | 175 | bool TS_Point::operator==(TS_Point p1) { |
JackB | 0:d146e986a07f | 176 | return ((p1.x == x) && (p1.y == y) && (p1.z == z)); |
JackB | 0:d146e986a07f | 177 | } |
JackB | 0:d146e986a07f | 178 | |
JackB | 0:d146e986a07f | 179 | bool TS_Point::operator!=(TS_Point p1) { |
JackB | 0:d146e986a07f | 180 | return ((p1.x != x) || (p1.y != y) || (p1.z != z)); |
JackB | 0:d146e986a07f | 181 | } |