Arduino MEGA 2560 with 2.8" TFT LCD pin connection

[sguzman55]

I have both the Arduino Uno and the Mega. I'm trying to connect a 2.8" TFT Touch Shield for Arduino Mega, and I've managed to successfully us it for the UNO but having trouble with the MEGA. I know that in the library it says something about using different pins but I was wondering how to exactly to do so...any help will be greatly appreciated.

2.8" TFT Touch Shield for Arduino is this one:

http://www.adafruit.com/products/376

[adafruit_support_bill]

From the tutorial:

FOR MEGA ARDUINOS edit the SD/utility/Sd2Card.h file after installing and uncomment the line that says #define MEGA_SOFT_SPI 1 to allow the Mega to use the same pinout for SD cards as the Classic Arduinos

[sguzman55]

Would this still work with TFTLCD graphictest? And also, i've tried looking for that line but I can only find a line that says "#define MEGA_SOFT_SPI 0" which is already uncommented. Do I leave that line alone, modify it, or add a seperate line that says "#define MEGA_SOFT_SPI 1"?

[adafruit_support_bill]

In the Arduino language, "0" is "false" and "1" is "true".

Change "#define MEGA_SOFT_SPI 0" to "#define MEGA_SOFT_SPI 1" to enable the MEGA pin definitions

[sguzman55]

I did so, but i'm still getting a white screen when I try to upload the TFTLCD/graphictest program, and that's the one I really want to use with the MEGA and not any of the SD example programs.

[adafruit_support_bill]

Open TFTLCD.h in the adafruit_tftlcd_library folder (or whatever you named it when you installed it).
Make sure that USE_ADAFRUIT_SHIELD_PINOUT is defined. The first few lines should look like this:

Code: Select all

// Graphics library by ladyada/adafruit with init code from Rossum
// banned license

#include <WProgram.h>

// comment or uncomment the next line for special pinout!
#define USE_ADAFRUIT_SHIELD_PINOUT


[sguzman55]

Just to be sure should i comment the following line, like so:

//#define USE_ADAFRUIT_SHIELD_PINOUT

and paste the the following lines:

#define MEGA_SOFT_SPI 1
//------------------------------------------------------------------------------
#if MEGA_SOFT_SPI && (defined(__AVR_ATmega1280__)||defined(__AVR_ATmega2560__))
#define SOFTWARE_SPI
#endif // MEGA_SOFT_SPI
//------------------------------------------------------------------------------

int the TFTLCD.h file??

[sguzman55]

Or what exactly do mean when you say to "make sure that USE_ADAFRUIT_SHIELD_PINOUT is defined?"

[adafruit_support_bill]

I mean it should look exactly like the code I posted above.

[sguzman55]

I've done so, and but i still get a white screen when I upload the TFTLCD/graphictest code. Is there anything I should do?

[adafruit_support_bill]

Post the sd2card.h and tftlcd.h files you are using.

Use the "Code" button to include the code in your message.

[sguzman55]

This is the tftlcd.h code:

Code: Select all

// Graphics library by ladyada/adafruit with init code from Rossum
// banned license

#include <WProgram.h>

// comment or uncomment the next line for special pinout!
#define USE_ADAFRUIT_SHIELD_PINOUT


// register names from Peter Barrett's Microtouch code

#define TFTLCD_START_OSC         0x00
#define TFTLCD_DRIV_OUT_CTRL      0x01
#define TFTLCD_DRIV_WAV_CTRL      0x02
#define TFTLCD_ENTRY_MOD         0x03
#define TFTLCD_RESIZE_CTRL         0x04
#define TFTLCD_DISP_CTRL1         0x07
#define TFTLCD_DISP_CTRL2         0x08
#define TFTLCD_DISP_CTRL3         0x09
#define TFTLCD_DISP_CTRL4         0x0A
#define TFTLCD_RGB_DISP_IF_CTRL1   0x0C
#define TFTLCD_FRM_MARKER_POS      0x0D
#define TFTLCD_RGB_DISP_IF_CTRL2   0x0F
#define TFTLCD_POW_CTRL1         0x10
#define TFTLCD_POW_CTRL2         0x11
#define TFTLCD_POW_CTRL3         0x12
#define TFTLCD_POW_CTRL4         0x13
#define TFTLCD_GRAM_HOR_AD         0x20
#define TFTLCD_GRAM_VER_AD         0x21
#define TFTLCD_RW_GRAM            0x22
#define TFTLCD_POW_CTRL7         0x29
#define TFTLCD_FRM_RATE_COL_CTRL   0x2B
#define TFTLCD_GAMMA_CTRL1         0x30
#define TFTLCD_GAMMA_CTRL2         0x31
#define TFTLCD_GAMMA_CTRL3         0x32
#define TFTLCD_GAMMA_CTRL4         0x35
#define TFTLCD_GAMMA_CTRL5         0x36
#define TFTLCD_GAMMA_CTRL6         0x37
#define TFTLCD_GAMMA_CTRL7         0x38
#define TFTLCD_GAMMA_CTRL8         0x39
#define TFTLCD_GAMMA_CTRL9         0x3C
#define TFTLCD_GAMMA_CTRL10         0x3D
#define TFTLCD_HOR_START_AD         0x50
#define TFTLCD_HOR_END_AD         0x51
#define TFTLCD_VER_START_AD         0x52
#define TFTLCD_VER_END_AD         0x53
#define TFTLCD_GATE_SCAN_CTRL1      0x60
#define TFTLCD_GATE_SCAN_CTRL2      0x61
#define TFTLCD_GATE_SCAN_CTRL3      0x6A
#define TFTLCD_PART_IMG1_DISP_POS   0x80
#define TFTLCD_PART_IMG1_START_AD   0x81
#define TFTLCD_PART_IMG1_END_AD      0x82
#define TFTLCD_PART_IMG2_DISP_POS   0x83
#define TFTLCD_PART_IMG2_START_AD   0x84
#define TFTLCD_PART_IMG2_END_AD      0x85
#define TFTLCD_PANEL_IF_CTRL1      0x90
#define TFTLCD_PANEL_IF_CTRL2      0x92
#define TFTLCD_PANEL_IF_CTRL3      0x93
#define TFTLCD_PANEL_IF_CTRL4      0x95
#define TFTLCD_PANEL_IF_CTRL5      0x97
#define TFTLCD_PANEL_IF_CTRL6      0x98

#define TFTLCD_DELAYCMD                 0xFF

#define swap(a, b) { int16_t t = a; a = b; b = t; }

class TFTLCD : public Print {
public:
  TFTLCD(uint8_t cs, uint8_t cd, uint8_t wr, uint8_t rd, uint8_t reset);

  uint16_t Color565(uint8_t r, uint8_t g, uint8_t b);

  // drawing primitives!
  void drawPixel(uint16_t x, uint16_t y, uint16_t color);
  void fillScreen(uint16_t color);
  void drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
  void drawFastLine(uint16_t x0, uint16_t y0, uint16_t l, uint16_t color, uint8_t flag);
  void drawVerticalLine(uint16_t x0, uint16_t y0, uint16_t length, uint16_t color);
  void drawHorizontalLine(uint16_t x0, uint16_t y0, uint16_t length, uint16_t color);
  void drawTriangle(uint16_t x0, uint16_t y0,
           uint16_t x1, uint16_t y1,
           uint16_t x2, uint16_t y2, uint16_t color);
  void fillTriangle(int32_t x0, int32_t y0,
           int32_t x1, int32_t y1,
          int32_t x2, int32_t y2,
          uint16_t color);
  void drawRect(uint16_t x0, uint16_t y0, uint16_t w, uint16_t h, uint16_t color);
  void fillRect(uint16_t x0, uint16_t y0, uint16_t w, uint16_t h, uint16_t color);
  void drawRoundRect(uint16_t x0, uint16_t y0, uint16_t w, uint16_t h, uint16_t radius, uint16_t color);
  void fillRoundRect(uint16_t x0, uint16_t y0, uint16_t w, uint16_t h, uint16_t radius, uint16_t color);
  void drawCircle(uint16_t x0, uint16_t y0, uint16_t r,   uint16_t color);
  void fillCircle(uint16_t x0, uint16_t y0, uint16_t r,   uint16_t color);

  void setCursor(uint16_t x, uint16_t y);
  void setTextColor(uint16_t c);
  void setTextSize(uint8_t s);
  virtual void write(uint8_t);

  void drawChar(uint16_t x, uint16_t y, char c, uint16_t color, uint8_t s = 1);
  void drawString(uint16_t x, uint16_t y, char *c, uint16_t color, uint8_t s = 1);

  // commands
  void initDisplay(void);
  void goHome(void);
  void goTo(int x, int y);

  void reset(void);
  void setRotation(uint8_t x);
  uint8_t getRotation();

  /* low level */

  void writeData(uint16_t d);
  void writeCommand(uint16_t c);
  uint16_t readData(void);
  uint16_t readRegister(uint16_t addr);
  void writeRegister(uint16_t addr, uint16_t data);


  uint16_t width();
  uint16_t height();

  static const uint16_t TFTWIDTH = 240;
  static const uint16_t TFTHEIGHT = 320;

  void writeData_unsafe(uint16_t d);

  void setWriteDir(void);
  void setReadDir(void);


  void write8(uint8_t d);

private:
  void drawCircleHelper(uint16_t x0, uint16_t y0, uint16_t r, uint8_t corner, uint16_t color);
  void fillCircleHelper(uint16_t x0, uint16_t y0, uint16_t r, uint8_t corner, uint16_t delta, uint16_t color);

  uint8_t read8(void);

  uint8_t _cs, _cd, _reset, _wr, _rd;

  uint8_t csport, cdport, wrport, rdport;
  uint8_t cspin, cdpin, wrpin, rdpin;

  uint16_t _width, _height;
  uint8_t textsize;
  uint16_t cursor_x, cursor_y;
  uint16_t textcolor;
  uint8_t rotation;
};


And here's the sd2card.h code:

Code: Select all

/* Arduino Sd2Card Library
* Copyright (C) 2009 by William Greiman
*
* This file is part of the Arduino Sd2Card Library
*
* This Library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or banned FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Arduino Sd2Card Library.  If not, see
* <http://www.gnu.org/licenses/>.
*/
#ifndef Sd2Card_h
#define Sd2Card_h
/**
* \file
* Sd2Card class
*/
#include "Sd2PinMap.h"
#include "SdInfo.h"
/** Set SCK to max rate of F_CPU/2. See Sd2Card::setSckRate(). */
uint8_t const SPI_FULL_SPEED = 0;
/** Set SCK rate to F_CPU/4. See Sd2Card::setSckRate(). */
uint8_t const SPI_HALF_SPEED = 1;
/** Set SCK rate to F_CPU/8. Sd2Card::setSckRate(). */
uint8_t const SPI_QUARTER_SPEED = 2;
/**
* Define MEGA_SOFT_SPI non-zero to use software SPI on Mega Arduinos.
* Pins used are SS 10, MOSI 11, MISO 12, and SCK 13.
*
* MEGA_SOFT_SPI allows an unmodified Adafruit GPS Shield to be used
* on Mega Arduinos.  Software SPI works well with GPS Shield V1.1
* but many SD cards will fail with GPS Shield V1.0.
*/
#define MEGA_SOFT_SPI 1
//------------------------------------------------------------------------------
#if MEGA_SOFT_SPI && (defined(__AVR_ATmega1280__)||defined(__AVR_ATmega2560__))
#define SOFTWARE_SPI
#endif  // MEGA_SOFT_SPI
//------------------------------------------------------------------------------
// SPI pin definitions
//
#ifndef SOFTWARE_SPI
// hardware pin defs
/**
* SD Chip Select pin
*
* Warning if this pin is redefined the hardware SS will pin will be enabled
* as an output by init().  An avr processor will not function as an SPI
* master unless SS is set to output mode.
*/
/** The default chip select pin for the SD card is SS. */
uint8_t const  SD_CHIP_SELECT_PIN = SS_PIN;
// The following three pins must not be redefined for hardware SPI.
/** SPI Master Out Slave In pin */
uint8_t const  SPI_MOSI_PIN = MOSI_PIN;
/** SPI Master In Slave Out pin */
uint8_t const  SPI_MISO_PIN = MISO_PIN;
/** SPI Clock pin */
uint8_t const  SPI_SCK_PIN = SCK_PIN;
/** optimize loops for hardware SPI */
#define OPTIMIZE_HARDWARE_SPI

#else  // SOFTWARE_SPI
// define software SPI pins so Mega can use unmodified GPS Shield
/** SPI chip select pin */
uint8_t const SD_CHIP_SELECT_PIN = 10;
/** SPI Master Out Slave In pin */
uint8_t const SPI_MOSI_PIN = 11;
/** SPI Master In Slave Out pin */
uint8_t const SPI_MISO_PIN = 12;
/** SPI Clock pin */
uint8_t const SPI_SCK_PIN = 13;
#endif  // SOFTWARE_SPI
//------------------------------------------------------------------------------
/** Protect block zero from write if nonzero */
#define SD_PROTECT_BLOCK_ZERO 1
/** init timeout ms */
uint16_t const SD_INIT_TIMEOUT = 2000;
/** erase timeout ms */
uint16_t const SD_ERASE_TIMEOUT = 10000;
/** read timeout ms */
uint16_t const SD_READ_TIMEOUT = 300;
/** write time out ms */
uint16_t const SD_WRITE_TIMEOUT = 600;
//------------------------------------------------------------------------------
// SD card errors
/** timeout error for command CMD0 */
uint8_t const SD_CARD_ERROR_CMD0 = 0X1;
/** CMD8 was not accepted - not a valid SD card*/
uint8_t const SD_CARD_ERROR_CMD8 = 0X2;
/** card returned an error response for CMD17 (read block) */
uint8_t const SD_CARD_ERROR_CMD17 = 0X3;
/** card returned an error response for CMD24 (write block) */
uint8_t const SD_CARD_ERROR_CMD24 = 0X4;
/**  WRITE_MULTIPLE_BLOCKS command failed */
uint8_t const SD_CARD_ERROR_CMD25 = 0X05;
/** card returned an error response for CMD58 (read OCR) */
uint8_t const SD_CARD_ERROR_CMD58 = 0X06;
/** SET_WR_BLK_ERASE_COUNT failed */
uint8_t const SD_CARD_ERROR_ACMD23 = 0X07;
/** card's ACMD41 initialization process timeout */
uint8_t const SD_CARD_ERROR_ACMD41 = 0X08;
/** card returned a bad CSR version field */
uint8_t const SD_CARD_ERROR_BAD_CSD = 0X09;
/** erase block group command failed */
uint8_t const SD_CARD_ERROR_ERASE = 0X0A;
/** card not capable of single block erase */
uint8_t const SD_CARD_ERROR_ERASE_SINGLE_BLOCK = 0X0B;
/** Erase sequence timed out */
uint8_t const SD_CARD_ERROR_ERASE_TIMEOUT = 0X0C;
/** card returned an error token instead of read data */
uint8_t const SD_CARD_ERROR_READ = 0X0D;
/** read CID or CSD failed */
uint8_t const SD_CARD_ERROR_READ_REG = 0X0E;
/** timeout while waiting for start of read data */
uint8_t const SD_CARD_ERROR_READ_TIMEOUT = 0X0F;
/** card did not accept STOP_TRAN_TOKEN */
uint8_t const SD_CARD_ERROR_STOP_TRAN = 0X10;
/** card returned an error token as a response to a write operation */
uint8_t const SD_CARD_ERROR_WRITE = 0X11;
/** attempt to write protected block zero */
uint8_t const SD_CARD_ERROR_WRITE_BLOCK_ZERO = 0X12;
/** card did not go ready for a multiple block write */
uint8_t const SD_CARD_ERROR_WRITE_MULTIPLE = 0X13;
/** card returned an error to a CMD13 status check after a write */
uint8_t const SD_CARD_ERROR_WRITE_PROGRAMMING = 0X14;
/** timeout occurred during write programming */
uint8_t const SD_CARD_ERROR_WRITE_TIMEOUT = 0X15;
/** incorrect rate selected */
uint8_t const SD_CARD_ERROR_SCK_RATE = 0X16;
//------------------------------------------------------------------------------
// card types
/** Standard capacity V1 SD card */
uint8_t const SD_CARD_TYPE_SD1 = 1;
/** Standard capacity V2 SD card */
uint8_t const SD_CARD_TYPE_SD2 = 2;
/** High Capacity SD card */
uint8_t const SD_CARD_TYPE_SDHC = 3;
//------------------------------------------------------------------------------
/**
* \class Sd2Card
* \brief Raw access to SD and SDHC flash memory cards.
*/
class Sd2Card {
public:
  /** Construct an instance of Sd2Card. */
  Sd2Card(void) : errorCode_(0), inBlock_(0), partialBlockRead_(0), type_(0) {}
  uint32_t cardSize(void);
  uint8_t erase(uint32_t firstBlock, uint32_t lastBlock);
  uint8_t eraseSingleBlockEnable(void);
  /**
   * \return error code for last error. See Sd2Card.h for a list of error codes.
   */
  uint8_t errorCode(void) const {return errorCode_;}
  /** \return error data for last error. */
  uint8_t errorData(void) const {return status_;}
  /**
   * Initialize an SD flash memory card with default clock rate and chip
   * select pin.  See sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin).
   */
  uint8_t init(void) {
    return init(SPI_FULL_SPEED, SD_CHIP_SELECT_PIN);
  }
  /**
   * Initialize an SD flash memory card with the selected SPI clock rate
   * and the default SD chip select pin.
   * See sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin).
   */
  uint8_t init(uint8_t sckRateID) {
    return init(sckRateID, SD_CHIP_SELECT_PIN);
  }
  uint8_t init(uint8_t sckRateID, uint8_t chipSelectPin);
  void partialBlockRead(uint8_t value);
  /** Returns the current value, true or false, for partial block read. */
  uint8_t partialBlockRead(void) const {return partialBlockRead_;}
  uint8_t readBlock(uint32_t block, uint8_t* dst);
  uint8_t readData(uint32_t block,
          uint16_t offset, uint16_t count, uint8_t* dst);
  /**
   * Read a cards CID register. The CID contains card identification
   * information such as Manufacturer ID, Product name, Product serial
   * number and Manufacturing date. */
  uint8_t readCID(cid_t* cid) {
    return readRegister(CMD10, cid);
  }
  /**
   * Read a cards CSD register. The CSD contains Card-Specific Data that
   * provides information regarding access to the card's contents. */
  uint8_t readCSD(csd_t* csd) {
    return readRegister(CMD9, csd);
  }
  void readEnd(void);
  uint8_t setSckRate(uint8_t sckRateID);
  /** Return the card type: SD V1, SD V2 or SDHC */
  uint8_t type(void) const {return type_;}
  uint8_t writeBlock(uint32_t blockNumber, const uint8_t* src);
  uint8_t writeData(const uint8_t* src);
  uint8_t writeStart(uint32_t blockNumber, uint32_t eraseCount);
  uint8_t writeStop(void);
private:
  uint32_t block_;
  uint8_t chipSelectPin_;
  uint8_t errorCode_;
  uint8_t inBlock_;
  uint16_t offset_;
  uint8_t partialBlockRead_;
  uint8_t status_;
  uint8_t type_;
  // private functions
  uint8_t cardAcmd(uint8_t cmd, uint32_t arg) {
    cardCommand(CMD55, 0);
    return cardCommand(cmd, arg);
  }
  uint8_t cardCommand(uint8_t cmd, uint32_t arg);
  void error(uint8_t code) {errorCode_ = code;}
  uint8_t readRegister(uint8_t cmd, void* buf);
  uint8_t sendWriteCommand(uint32_t blockNumber, uint32_t eraseCount);
  void chipSelectHigh(void);
  void chipSelectLow(void);
  void type(uint8_t value) {type_ = value;}
  uint8_t waitNotBusy(uint16_t timeoutMillis);
  uint8_t writeData(uint8_t token, const uint8_t* src);
  uint8_t waitStartBlock(void);
};
#endif  // Sd2Card_h


[sguzman55]

Just to be clear, my over all goal is to use the 2.8" TFT LCD display with the arduino MEGA using the TFTLCD/graphictest example and having both devices connected like this:



Again I really appreciate the time and effort it's taken to help me!

[adafruit_support_bill]

Those files are correct. I compiled and loaded with them and it is working here with my shield on a Mega2650.
You said that the shield works on your UNO. What model of the MEGA are you using?

[sguzman55]

I'm using the Mega 2560...