Pixels_ST7735.h

/*
 * Pixels. Graphics library for TFT displays.
 *
 * Copyright (C) 2012-2013  Igor Repinetski
 *
 * The code is written in C/C++ for Arduino and can be easily ported to any microcontroller by rewritting the low level pin access functions.
 *
 * Text output methods of the library rely on Pixelmeister's font data format. See: http://pd4ml.com/pixelmeister
 *
 * This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
 *
 * This library includes some code portions and algoritmic ideas derived from works of
 * - Andreas Schiffler -- aschiffler at ferzkopp dot net (SDL_gfx Project)
 * - K. Townsend http://microBuilder.eu (lpc1343codebase Project)
 */

/*
 * Pixels port to ILI9341 controller, SPI mode (ElecFreaks TFT2.2SP Shield)
 * SPI is in bit banging mode, as the shield does not connect the hardware SPI (SCL=13, SDA=11)
 * to the display controller
 */

#include "Pixels.h"

#ifndef PIXELS_ST7735_H
#define PIXELS_ST7735_H
#define PIXELS_MAIN

#if defined(PIXELS_ANTIALIASING_H)
#define PixelsBase PixelsAntialiased
#endif

class Pixels : public PixelsBase
#if defined(PIXELS_SPISW_H)
                                    , public SPIsw
#elif defined(PIXELS_SPIHW_H)
                                    , public SPIhw
#elif defined(PIXELS_PPI8_H)
                                    , public PPI8
#elif defined(PIXELS_PPI16_H)
                                    , public PPI16
#endif
{
protected:
    void deviceWriteData(uint8_t high, uint8_t low);

    int32_t setRegion(int16_t x1, int16_t y1, int16_t x2, int16_t y2);
    void quickFill(int b, int16_t x1, int16_t y1, int16_t x2, int16_t y2);
    void setFillDirection(uint8_t direction);

    void scrollCmd();

public:
    Pixels(uint16_t width, uint16_t height) : PixelsBase(width, height) { // ElecFreaks TFT1.8SP shield pins
        scrollSupported = true;
        setSpiPins(6, 7, 5, 3 ,4); // dummy code in PPI case
        setPpiPins(38, 39, 40, 41, 0); // dummy code in SPI case
    }

    Pixels() : PixelsBase(128, 160) { // ElecFreaks TFT1.8SP shield as default
        scrollSupported = true;
        setSpiPins(6, 7, 5, 3 ,4); // dummy code in PPI case
        setPpiPins(38, 39, 40, 41, 0); // dummy code in SPI case
    }

    void init();
};

#if defined(PIXELS_ANTIALIASING_H)
#undef PixelsBase
#endif

void Pixels::init() {

    initInterface();

    chipSelect();
    writeCmd(0x11);
    delay(12);

    writeCmd(0xB1);
    writeData(0x01);
    writeData(0x2C);
    writeData(0x2D);
    writeCmd(0xB2);
    writeData(0x01);
    writeData(0x2C);
    writeData(0x2D);
    writeCmd(0xB3);
    writeData(0x01);
    writeData(0x2C);
    writeData(0x2D);
    writeData(0x01);
    writeData(0x2C);
    writeData(0x2D);

    writeCmd(0xB4);
    writeData(0x07);

    writeCmd(0xC0);
    writeData(0xA2);
    writeData(0x02);
    writeData(0x84);
    writeCmd(0xC1);
    writeData(0xC5);
    writeCmd(0xC2);
    writeData(0x0A);
    writeData(0x00);
    writeCmd(0xC3);
    writeData(0x8A);
    writeData(0x2A);
    writeCmd(0xC4);
    writeData(0x8A);
    writeData(0xEE);

    writeCmd(0xC5);
    writeData(0x0E);

    writeCmd(0x36);
    writeData(0xC0); // 0xC8 - BGR

    writeCmd(0xe0);
    writeData(0x0f);
    writeData(0x1a);
    writeData(0x0f);
    writeData(0x18);
    writeData(0x2f);
    writeData(0x28);
    writeData(0x20);
    writeData(0x22);
    writeData(0x1f);
    writeData(0x1b);
    writeData(0x23);
    writeData(0x37);
    writeData(0x00);

    writeData(0x07);
    writeData(0x02);
    writeData(0x10);
    writeCmd(0xe1);
    writeData(0x0f);
    writeData(0x1b);
    writeData(0x0f);
    writeData(0x17);
    writeData(0x33);
    writeData(0x2c);
    writeData(0x29);
    writeData(0x2e);
    writeData(0x30);
    writeData(0x30);
    writeData(0x39);
    writeData(0x3f);
    writeData(0x00);
    writeData(0x07);
    writeData(0x03);
    writeData(0x10);

    writeCmd(0x2a);
    writeData(0x00);
    writeData(0x00);
    writeData(0x00);
    writeData(0x7f);
    writeCmd(0x2b);
    writeData(0x00);
    writeData(0x00);
    writeData(0x00);
    writeData(0x9f);

    writeCmd(0xF0);
    writeData(0x01);
    writeCmd(0xF6);
    writeData(0x00);

    writeCmd(0x3A);
    writeData(0x05);
    writeCmd(0x29);

    chipDeselect();
}

void Pixels::scrollCmd() {
    int16_t s = (orientation < 2 ? deviceHeight - currentScroll : currentScroll) % deviceHeight;
    // the feature seems to be undocumented in the datasheet
    writeCmd(0x37);
//    writeData(highByte(deviceHeight - currentScroll));
//    writeData(lowByte(deviceHeight - currentScroll));
    writeData(highByte(s));
    writeData(lowByte(s));
}

void Pixels::setFillDirection(uint8_t direction) {
    fillDirection = direction;
}

void Pixels::quickFill (int color, int16_t x1, int16_t y1, int16_t x2, int16_t y2) {
    int32_t counter = setRegion(x1, y1, x2, y2);
    if( counter == 0 ) {
        return;
    }

    registerSelect();

    uint8_t lo = lowByte(color);
    uint8_t hi = highByte(color);

    for (int16_t i = 0; i < counter / 20; i++) {
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
        writeData(hi);writeData(lo);
    }
    for (int32_t i = 0; i < counter % 20; i++) {
        writeData(hi);writeData(lo);
    }
}

int32_t Pixels::setRegion(int16_t x1, int16_t y1, int16_t x2, int16_t y2) {

    Bounds bb(x1, y1, x2, y2);
    if( !checkBounds(bb) ) {
        return 0;
    }

    writeCmd(0x2a);
    writeData(bb.x1>>8);
    writeData(bb.x1);
    writeData(bb.x2>>8);
    writeData(bb.x2);
    writeCmd(0x2b);
    writeData(bb.y1>>8);
    writeData(bb.y1);
    writeData(bb.y2>>8);
    writeData(bb.y2);
    writeCmd(0x2c);

    return (int32_t)(bb.x2 - bb.x1 + 1) * (bb.y2 - bb.y1 + 1);
}

void Pixels::deviceWriteData(uint8_t high, uint8_t low) {
    writeData(high);
    writeData(low);
}
#endif