/*

 * GraphLCD driver library

 *

 * avrctl.c  -  AVR controlled LCD driver class

 *

 * This file is released under the GNU General Public License. Refer

 * to the COPYING file distributed with this package.

 *

 * (c) 2005 Andreas Regel <andreas.regel AT powarman.de>

 */

#include <stdint.h>

#include <syslog.h>

#include "common.h"

#include "config.h"

#include "port.h"

#include "avrctl.h"

namespace GLCD

{

/* command header:

**  8 bits  sync byte (0xAA for sent commands, 0x55 for received commands)

**  8 bits  command id

** 16 bits  command length (excluding header)

*/

const unsigned char CMD_HDR_SYNC    = 0;

const unsigned char CMD_HDR_COMMAND = 1;

const unsigned char CMD_HDR_LENGTH  = 2;

const unsigned char CMD_DATA_START  = 4;

const unsigned char CMD_SYNC_SEND = 0xAA;

const unsigned char CMD_SYNC_RECV = 0x55;

const unsigned char CMD_SYS_SYNC = 0x00;

const unsigned char CMD_SYS_ACK  = 0x01;

const unsigned char CMD_DISP_CLEAR_SCREEN   = 0x10;

const unsigned char CMD_DISP_SWITCH_SCREEN  = 0x11;

const unsigned char CMD_DISP_SET_BRIGHTNESS = 0x12;

const unsigned char CMD_DISP_SET_COL_DATA   = 0x13;

const unsigned char CMD_DISP_SET_ROW_DATA   = 0x14;

const unsigned char CMD_DISP_UPDATE         = 0x15;

const int kBufferWidth  = 256;

const int kBufferHeight = 128;

cDriverAvrCtl::cDriverAvrCtl(cDriverConfig * config)

:   config(config)

{

    oldConfig = new cDriverConfig(*config);

    port = new cSerialPort();

    //width = config->width;

    //height = config->height;

    refreshCounter = 0;

}

cDriverAvrCtl::~cDriverAvrCtl()

{

    delete port;

    delete oldConfig;

}

int cDriverAvrCtl::Init()

{

    int x;

    width = config->width;

    if (width <= 0)

        width = 256;

    height = config->height;

    if (height <= 0)

        height = 128;

    for (unsigned int i = 0; i < config->options.size(); i++)

    {

        if (config->options[i].name == "")

        {

        }

    }

    // setup lcd array (wanted state)

    newLCD = new unsigned char*[kBufferWidth];

    if (newLCD)

    {

        for (x = 0; x < kBufferWidth; x++)

        {

            newLCD[x] = new unsigned char[(kBufferHeight + 7) / 8];

            memset(newLCD[x], 0, (kBufferHeight + 7) / 8);

        }

    }

    // setup lcd array (current state)

    oldLCD = new unsigned char*[kBufferWidth];

    if (oldLCD)

    {

        for (x = 0; x < kBufferWidth; x++)

        {

            oldLCD[x] = new unsigned char[(kBufferHeight + 7) / 8];

            memset(oldLCD[x], 0, (kBufferHeight + 7) / 8);

        }

    }

    if (config->device == "")

    {

        return -1;

    }

    if (port->Open(config->device.c_str()) != 0)

        return -1;

    *oldConfig = *config;

    // clear display

    Clear();

    syslog(LOG_INFO, "%s: AvrCtl initialized.\n", config->name.c_str());

    return 0;

}

int cDriverAvrCtl::DeInit()

{

    int x;

    // free lcd array (wanted state)

    if (newLCD)

    {

        for (x = 0; x < kBufferWidth; x++)

        {

            delete[] newLCD[x];

        }

        delete[] newLCD;

    }

    // free lcd array (current state)

    if (oldLCD)

    {

        for (x = 0; x < kBufferWidth; x++)

        {

            delete[] oldLCD[x];

        }

        delete[] oldLCD;

    }

    if (port->Close() != 0)

        return -1;

    return 0;

}

int cDriverAvrCtl::CheckSetup()

{

    if (config->device != oldConfig->device ||

        config->width != oldConfig->width ||

        config->height != oldConfig->height)

    {

        DeInit();

        Init();

        return 0;

    }

    if (config->upsideDown != oldConfig->upsideDown ||

        config->invert != oldConfig->invert)

    {

        oldConfig->upsideDown = config->upsideDown;

        oldConfig->invert = config->invert;

        return 1;

    }

    return 0;

}

void cDriverAvrCtl::Clear()

{

    for (int x = 0; x < kBufferWidth; x++)

        memset(newLCD[x], 0, (kBufferHeight + 7) / 8);

}

void cDriverAvrCtl::Set8Pixels(int x, int y, unsigned char data)

{

    if (x >= width || y >= height)

        return;

    if (!config->upsideDown)

    {

        int offset = 7 - (y % 8);

        for (int i = 0; i < 8; i++)

        {

            newLCD[x + i][y / 8] |= ((data >> (7 - i)) << offset) & (1 << offset);

        }

    }

    else

    {

        x = width - 1 - x;

        y = height - 1 - y;

        int offset = 7 - (y % 8);

        for (int i = 0; i < 8; i++)

        {

            newLCD[x - i][y / 8] |= ((data >> (7 - i)) << offset) & (1 << offset);

        }

    }

}

void cDriverAvrCtl::Refresh(bool refreshAll)

{

    int x;

    int y;

    int i;

    int num = kBufferWidth / 2;

    unsigned char data[16*num];

    if (CheckSetup() == 1)

        refreshAll = true;

    if (config->refreshDisplay > 0)

    {

        refreshCounter = (refreshCounter + 1) % config->refreshDisplay;

        if (!refreshAll && !refreshCounter)

            refreshAll = true;

    }

    refreshAll = true;

    if (refreshAll)

    {

        for (x = 0; x < kBufferWidth; x += num)

        {

            for (i = 0; i < num; i++)

            {

                for (y = 0; y < (kBufferHeight + 7) / 8; y++)

                {

                    data[i * ((kBufferHeight + 7) / 8) + y] = (newLCD[x + i][y]) ^ (config->invert ? 0xff : 0x00);

                }

                memcpy(oldLCD[x + i], newLCD[x + i], (kBufferHeight + 7) / 8);

            }

            CmdDispSetColData(x, 0, 16 * num, data);

        }

        CmdDispUpdate();

        CmdDispSwitchScreen();

        // and reset RefreshCounter

        refreshCounter = 0;

    }

    else

    {

        // draw only the changed bytes

    }

}

void cDriverAvrCtl::SetBrightness(unsigned int percent)

{

  CmdDispSetBrightness(percent);

}

int cDriverAvrCtl::WaitForAck(void)

{

    uint8_t cmd[4];

    int len;

    int timeout = 10000;

    len = 0;

    while (len < 4 && timeout > 0)

    {

        len += port->ReadData(&cmd[len]);

        timeout--;

    }

    if (timeout == 0)

        return 0;

    return 1;

}

void cDriverAvrCtl::CmdSysSync(void)

{

    uint8_t cmd[4];

    cmd[CMD_HDR_SYNC] = CMD_SYNC_SEND;

    cmd[CMD_HDR_COMMAND] = CMD_SYS_SYNC;

    cmd[CMD_HDR_LENGTH] = 0;

    cmd[CMD_HDR_LENGTH+1] = 0;

    port->WriteData(cmd, 4);

    WaitForAck();

}

void cDriverAvrCtl::CmdDispClearScreen(void)

{

    uint8_t cmd[4];

    cmd[CMD_HDR_SYNC] = CMD_SYNC_SEND;

    cmd[CMD_HDR_COMMAND] = CMD_DISP_CLEAR_SCREEN;

    cmd[CMD_HDR_LENGTH] = 0;

    cmd[CMD_HDR_LENGTH+1] = 0;

    port->WriteData(cmd, 4);

    WaitForAck();

}

void cDriverAvrCtl::CmdDispSwitchScreen(void)

{

    uint8_t cmd[4];

    cmd[CMD_HDR_SYNC] = CMD_SYNC_SEND;

    cmd[CMD_HDR_COMMAND] = CMD_DISP_SWITCH_SCREEN;

    cmd[CMD_HDR_LENGTH] = 0;

    cmd[CMD_HDR_LENGTH+1] = 0;

    port->WriteData(cmd, 4);

    WaitForAck();

}

void cDriverAvrCtl::CmdDispSetBrightness(uint8_t percent)

{

    uint8_t cmd[5];

    cmd[CMD_HDR_SYNC] = CMD_SYNC_SEND;

    cmd[CMD_HDR_COMMAND] = CMD_DISP_SET_BRIGHTNESS;

    cmd[CMD_HDR_LENGTH] = 0;

    cmd[CMD_HDR_LENGTH+1] = 1;

    cmd[CMD_DATA_START] = percent;

    port->WriteData(cmd, 5);

    WaitForAck();

}

void cDriverAvrCtl::CmdDispSetColData(uint16_t column, uint16_t offset, uint16_t length, uint8_t * data)

{

    uint8_t cmd[2560];

    cmd[CMD_HDR_SYNC] = CMD_SYNC_SEND;

    cmd[CMD_HDR_COMMAND] = CMD_DISP_SET_COL_DATA;

    cmd[CMD_HDR_LENGTH] = (length + 6) >> 8;

    cmd[CMD_HDR_LENGTH+1] = (length + 6);

    cmd[CMD_DATA_START] = column >> 8;

    cmd[CMD_DATA_START+1] = column;

    cmd[CMD_DATA_START+2] = offset >> 8;

    cmd[CMD_DATA_START+3] = offset;

    cmd[CMD_DATA_START+4] = length >> 8;

    cmd[CMD_DATA_START+5] = length;

    memcpy(&cmd[CMD_DATA_START+6], data, length);

    port->WriteData(cmd, length+10);

    WaitForAck();

}

void cDriverAvrCtl::CmdDispUpdate(void)

{

    uint8_t cmd[4];

    cmd[CMD_HDR_SYNC] = CMD_SYNC_SEND;

    cmd[CMD_HDR_COMMAND] = CMD_DISP_UPDATE;

    cmd[CMD_HDR_LENGTH] = 0;

    cmd[CMD_HDR_LENGTH+1] = 0;

    port->WriteData(cmd, 4);

    WaitForAck();

}

}