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
- Committer:
- JackB
- Date:
- 2015-03-23
- Revision:
- 4:b9ff3c020e7f
- Parent:
- 3:8e16a8987166
- Child:
- 5:652684757b6b
File content as of revision 4:b9ff3c020e7f:
/* Copyright (c) 2015 Jack Berkhout Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. This is a library for the Adafruit Capacitive Touch Screens ----> http://www.adafruit.com/products/1947 This chipset uses I2C to communicate Based on Arduino written by Limor Fried/Ladyada for Adafruit Industries. On the shield, these jumpers were bridged: Int - #7 (default) SCK - 13 (default) SO - 12 (default) SI - 11 SCL - SCL SDA - SDA Usage: #include "mbed.h" #include "SPI_TFT_ILI9341.h" #include "FT6206.h" #include "Arial12x12.h" #define PIN_XP A3 #define PIN_XM A1 #define PIN_YP A2 #define PIN_YM A0 #define PIN_SCLK D13 #define PIN_MISO D12 #define PIN_MOSI D11 #define PIN_CS_TFT D10 // chip select pin #define PIN_DC_TFT D9 // data/command select pin. #define PIN_RESET_TFT D8 //#define PIN_BL_TFT D7 #define PIN_CS_SD D4 #define PORTRAIT 0 #define LANDSCAPE 1 #define PIN_SCL_FT6206 P0_28 #define PIN_SDA_FT6206 P0_27 #define PIN_INT_FT6206 D7 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 FT6206 FT6206(PIN_SDA_FT6206, PIN_SCL_FT6206, PIN_INT_FT6206); // sda, scl, int int main() { while(1) { // if (FT6206.touched()) { if (FT6206.dataReceived()) { // Retrieve a point TS_Point p = FT6206.getPoint(); printf("Touch %3d %3d\n", p.x, p.y); } } } */ #include "FT6206.h" FT6206::FT6206(PinName sda, PinName scl, PinName interrupt) : m_i2c(sda, scl), m_interrupt(interrupt) { m_addr = (FT6206_ADDR << 1); m_i2c.frequency(FT6206_I2C_FREQUENCY); m_interrupt.mode(PullUp); } /**************************************************************************/ /*! @brief Setups the HW */ /**************************************************************************/ bool FT6206::begin(uint8_t threshhold) { // change threshhold to be higher/lower writeRegister8(FT6206_REG_THRESHHOLD, threshhold); if (readRegister8(FT6206_REG_VENDID) != 17) return false; if (readRegister8(FT6206_REG_CHIPID) != 6) return false; /* printf("Vend ID: %d\n", readRegister8(FT6206_REG_VENDID)); printf("Chip ID: %d\n", readRegister8(FT6206_REG_CHIPID)); printf("Firm V: %d\n", readRegister8(FT6206_REG_FIRMVERS)); printf("Rate Hz: %d\n", readRegister8(FT6206_REG_POINTRATE)); printf("Thresh: %d\n", readRegister8(FT6206_REG_THRESHHOLD)); */ // dump all registers /* for (int16_t i=0; i<0x20; i++) { printf("I2C $%02x = 0x %02x\n", i, readRegister8(i)); } */ return true; } bool FT6206::touched(void) { uint8_t n = readRegister8(FT6206_REG_NUMTOUCHES); if ((n == 1) || (n == 2)) return true; return false; } /*****************************/ void FT6206::readData(uint16_t *x, uint16_t *y) { char i2cdat[16]; m_i2c.write(m_addr, 0x00, 1); m_i2c.read(m_addr, i2cdat, 16); /* for (int16_t i=0; i<0x20; i++) { printf("I2C %02x = %02x\n", i, i2cdat[i]);; } */ touches = i2cdat[0x02]; // printf("touches: %d\n", touches); if (touches > 2) { touches = 0; *x = *y = 0; } if (touches == 0) { *x = *y = 0; return; } /* if (touches == 2) Serial.print('2'); for (uint8_t i=0; i<16; i++) { printf("%02x ", i2cdat[i]); } printf("\n"); */ /* printf("\n"); if (i2cdat[0x01] != 0x00) { printf("Gesture #%d\n", i2cdat[0x01]); } */ //printf("# Touches: %d", touches); for (uint8_t i=0; i<2; i++) { touchY[i] = i2cdat[0x03 + i*6] & 0x0F; touchY[i] <<= 8; touchY[i] |= i2cdat[0x04 + i*6]; touchX[i] = i2cdat[0x05 + i*6] & 0x0F; touchX[i] <<= 8; touchX[i] |= i2cdat[0x06 + i*6]; touchID[i] = i2cdat[0x05 + i*6] >> 4; } /* for (uint8_t i=0; i<touches; i++) { printf("ID #%d (%d, %d", touchID[i], touchX[i], touchY[i]); printf(")\n"); } */ *x = ILI9341_TFTWIDTH - touchX[0]; *y = touchY[0]; } TS_Point FT6206::getPoint(void) { uint16_t x, y; readData(&x, &y); return TS_Point(x, y, 1); } char FT6206::readRegister8(char reg) { char val; m_i2c.write(m_addr, ®, 1); m_i2c.read(m_addr, &val, 1); return val; } void FT6206::writeRegister8(char reg, char val) { char data[2]; data[0] = reg; data[1] = val; m_i2c.write((int)FT6206_ADDR, data, 2); } char FT6206::dataReceived(void) { return !m_interrupt; } /****************/ TS_Point::TS_Point(void) { x = y = 0; } TS_Point::TS_Point(int16_t x0, int16_t y0, int16_t z0) { x = x0; y = y0; z = z0; } bool TS_Point::operator==(TS_Point p1) { return ((p1.x == x) && (p1.y == y) && (p1.z == z)); } bool TS_Point::operator!=(TS_Point p1) { return ((p1.x != x) || (p1.y != y) || (p1.z != z)); }