//*****************************************************************************
//
// osram128x64x4.c - Driver for the OSRAM 128x64x4 graphical OLED display.
//
// Copyright (c) 2006-2007 Luminary Micro, Inc.  All rights reserved.
// 
// Software License Agreement
// 
// Luminary Micro, Inc. (LMI) is supplying this software for use solely and
// exclusively on LMI's microcontroller products.
// 
// The software is owned by LMI and/or its suppliers, and is protected under
// applicable copyright laws.  All rights are reserved.  Any use in violation
// of the foregoing restrictions may subject the user to criminal sanctions
// under applicable laws, as well as to civil liability for the breach of the
// terms and conditions of this license.
// 
// THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
// OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
// LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
// CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is part of revision 1408 of the Stellaris Peripheral Driver Library.
//
//*****************************************************************************

//*****************************************************************************
//
//! \addtogroup ek_lm3sx965_api
//! @{
//
//*****************************************************************************

#include "hw_ssi.h"
#include "hw_memmap.h"
#include "hw_sysctl.h"
#include "hw_types.h"
#include "debug.h"
#include "gpio.h"
#include "ssi.h"
#include "sysctl.h"
#include "osram128x64x4.h"

//*****************************************************************************
//
// Flag to indicate if SSI port is enabled for OSRAM usage.
//
//*****************************************************************************
static volatile tBoolean g_bSSIEnabled = false;

//*****************************************************************************
//
// Define the OSRAM 128x64x4 Remap Setting(s).  This will be used in
// several places in the code to switch between vertical and horizontal
// address incrementing.
//
// The Remap Command (0xA0) takes one 8-bit parameter.  The parameter is
// defined as follows.
//
// Bit 7: Reserved
// Bit 6: Disable(0)/Enable(1) COM Split Odd Even
//        When enabled, the COM signals are split Odd on one side, even on
//        the other.  Otherwise, they are split 0-39 on one side, 40-79 on
//        the other.
// Bit 5: Reserved
// Bit 4: Disable(0)/Enable(1) COM Remap
//        When Enabled, ROW 0-79 map to COM 79-0 (i.e. reverse row order)
// Bit 3: Reserved
// Bit 2: Horizontal(0)/Vertical(1) Address Increment
//        When set, data RAM address will increment along the column rather
//        than along the row.
// Bit 1: Disable(0)/Enable(1) Nibble Remap
//        When enabled, the upper and lower nibbles in the DATA bus for access
//        to the data RAM are swapped.
// Bit 0: Disable(0)/Enable(1) Column Address Remap
//        When enabled, DATA RAM columns 0-63 are remapped to Segment Columns
//        127-0.
//
//*****************************************************************************
#define OSRAM_INIT_REMAP    0x52
#define OSRAM_INIT_OFFSET   0x4C
static const unsigned char g_pucOSRAM128x64x4VerticalInc[]   = { 0xA0, 0x56 };
static const unsigned char g_pucOSRAM128x64x4HorizontalInc[] = { 0xA0, 0x52 };

//*****************************************************************************
//
// A 5x7 font (in a 6x8 cell, where the sixth column is omitted from this
// table) for displaying text on the OLED display.  The data is organized as
// bytes from the left column to the right column, with each byte containing
// the top row in the LSB and the bottom row in the MSB.
//
// Note:  This is the same font data that is used in the EK-LM3S811
// osram96x16x1 driver.  The single bit-per-pixel is expaned in the StringDraw
// function to the appropriate four bit-per-pixel gray scale format.
//
//*****************************************************************************
static const unsigned char g_pucFont[96][5] =
{
    { 0x00, 0x00, 0x00, 0x00, 0x00 }, // " "
    { 0x00, 0x00, 0x4f, 0x00, 0x00 }, // !
    { 0x00, 0x07, 0x00, 0x07, 0x00 }, // "
    { 0x14, 0x7f, 0x14, 0x7f, 0x14 }, // #
    { 0x24, 0x2a, 0x7f, 0x2a, 0x12 }, // $
    { 0x23, 0x13, 0x08, 0x64, 0x62 }, // %
    { 0x36, 0x49, 0x55, 0x22, 0x50 }, // &
    { 0x00, 0x05, 0x03, 0x00, 0x00 }, // '
    { 0x00, 0x1c, 0x22, 0x41, 0x00 }, // (
    { 0x00, 0x41, 0x22, 0x1c, 0x00 }, // )
    { 0x14, 0x08, 0x3e, 0x08, 0x14 }, // *
    { 0x08, 0x08, 0x3e, 0x08, 0x08 }, // +
    { 0x00, 0x50, 0x30, 0x00, 0x00 }, // ,
    { 0x08, 0x08, 0x08, 0x08, 0x08 }, // -
    { 0x00, 0x60, 0x60, 0x00, 0x00 }, // .
    { 0x20, 0x10, 0x08, 0x04, 0x02 }, // /
    { 0x3e, 0x51, 0x49, 0x45, 0x3e }, // 0
    { 0x00, 0x42, 0x7f, 0x40, 0x00 }, // 1
    { 0x42, 0x61, 0x51, 0x49, 0x46 }, // 2
    { 0x21, 0x41, 0x45, 0x4b, 0x31 }, // 3
    { 0x18, 0x14, 0x12, 0x7f, 0x10 }, // 4
    { 0x27, 0x45, 0x45, 0x45, 0x39 }, // 5
    { 0x3c, 0x4a, 0x49, 0x49, 0x30 }, // 6
    { 0x01, 0x71, 0x09, 0x05, 0x03 }, // 7
    { 0x36, 0x49, 0x49, 0x49, 0x36 }, // 8
    { 0x06, 0x49, 0x49, 0x29, 0x1e }, // 9
    { 0x00, 0x36, 0x36, 0x00, 0x00 }, // :
    { 0x00, 0x56, 0x36, 0x00, 0x00 }, // ;
    { 0x08, 0x14, 0x22, 0x41, 0x00 }, // <
    { 0x14, 0x14, 0x14, 0x14, 0x14 }, // =
    { 0x00, 0x41, 0x22, 0x14, 0x08 }, // >
    { 0x02, 0x01, 0x51, 0x09, 0x06 }, // ?
    { 0x32, 0x49, 0x79, 0x41, 0x3e }, // @
    { 0x7e, 0x11, 0x11, 0x11, 0x7e }, // A
    { 0x7f, 0x49, 0x49, 0x49, 0x36 }, // B
    { 0x3e, 0x41, 0x41, 0x41, 0x22 }, // C
    { 0x7f, 0x41, 0x41, 0x22, 0x1c }, // D
    { 0x7f, 0x49, 0x49, 0x49, 0x41 }, // E
    { 0x7f, 0x09, 0x09, 0x09, 0x01 }, // F
    { 0x3e, 0x41, 0x49, 0x49, 0x7a }, // G
    { 0x7f, 0x08, 0x08, 0x08, 0x7f }, // H
    { 0x00, 0x41, 0x7f, 0x41, 0x00 }, // I
    { 0x20, 0x40, 0x41, 0x3f, 0x01 }, // J
    { 0x7f, 0x08, 0x14, 0x22, 0x41 }, // K
    { 0x7f, 0x40, 0x40, 0x40, 0x40 }, // L
    { 0x7f, 0x02, 0x0c, 0x02, 0x7f }, // M
    { 0x7f, 0x04, 0x08, 0x10, 0x7f }, // N
    { 0x3e, 0x41, 0x41, 0x41, 0x3e }, // O
    { 0x7f, 0x09, 0x09, 0x09, 0x06 }, // P
    { 0x3e, 0x41, 0x51, 0x21, 0x5e }, // Q
    { 0x7f, 0x09, 0x19, 0x29, 0x46 }, // R
    { 0x46, 0x49, 0x49, 0x49, 0x31 }, // S
    { 0x01, 0x01, 0x7f, 0x01, 0x01 }, // T
    { 0x3f, 0x40, 0x40, 0x40, 0x3f }, // U
    { 0x1f, 0x20, 0x40, 0x20, 0x1f }, // V
    { 0x3f, 0x40, 0x38, 0x40, 0x3f }, // W
    { 0x63, 0x14, 0x08, 0x14, 0x63 }, // X
    { 0x07, 0x08, 0x70, 0x08, 0x07 }, // Y
    { 0x61, 0x51, 0x49, 0x45, 0x43 }, // Z
    { 0x00, 0x7f, 0x41, 0x41, 0x00 }, // [
    { 0x02, 0x04, 0x08, 0x10, 0x20 }, // "\"
    { 0x00, 0x41, 0x41, 0x7f, 0x00 }, // ]
    { 0x04, 0x02, 0x01, 0x02, 0x04 }, // ^
    { 0x40, 0x40, 0x40, 0x40, 0x40 }, // _
    { 0x00, 0x01, 0x02, 0x04, 0x00 }, // `
    { 0x20, 0x54, 0x54, 0x54, 0x78 }, // a
    { 0x7f, 0x48, 0x44, 0x44, 0x38 }, // b
    { 0x38, 0x44, 0x44, 0x44, 0x20 }, // c
    { 0x38, 0x44, 0x44, 0x48, 0x7f }, // d
    { 0x38, 0x54, 0x54, 0x54, 0x18 }, // e
    { 0x08, 0x7e, 0x09, 0x01, 0x02 }, // f
    { 0x0c, 0x52, 0x52, 0x52, 0x3e }, // g
    { 0x7f, 0x08, 0x04, 0x04, 0x78 }, // h
    { 0x00, 0x44, 0x7d, 0x40, 0x00 }, // i
    { 0x20, 0x40, 0x44, 0x3d, 0x00 }, // j
    { 0x7f, 0x10, 0x28, 0x44, 0x00 }, // k
    { 0x00, 0x41, 0x7f, 0x40, 0x00 }, // l
    { 0x7c, 0x04, 0x18, 0x04, 0x78 }, // m
    { 0x7c, 0x08, 0x04, 0x04, 0x78 }, // n
    { 0x38, 0x44, 0x44, 0x44, 0x38 }, // o
    { 0x7c, 0x14, 0x14, 0x14, 0x08 }, // p
    { 0x08, 0x14, 0x14, 0x18, 0x7c }, // q
    { 0x7c, 0x08, 0x04, 0x04, 0x08 }, // r
    { 0x48, 0x54, 0x54, 0x54, 0x20 }, // s
    { 0x04, 0x3f, 0x44, 0x40, 0x20 }, // t
    { 0x3c, 0x40, 0x40, 0x20, 0x7c }, // u
    { 0x1c, 0x20, 0x40, 0x20, 0x1c }, // v
    { 0x3c, 0x40, 0x30, 0x40, 0x3c }, // w
    { 0x44, 0x28, 0x10, 0x28, 0x44 }, // x
    { 0x0c, 0x50, 0x50, 0x50, 0x3c }, // y
    { 0x44, 0x64, 0x54, 0x4c, 0x44 }, // z
    { 0x00, 0x08, 0x36, 0x41, 0x00 }, // {
    { 0x00, 0x00, 0x7f, 0x00, 0x00 }, // |
    { 0x00, 0x41, 0x36, 0x08, 0x00 }, // }
    { 0x02, 0x01, 0x02, 0x04, 0x02 }, // ~
    { 0x02, 0x01, 0x02, 0x04, 0x02 }, // ~
};

//*****************************************************************************
//
// The sequence of commands used to initialize the SSD0303 controller.  Each
// command is described as follows:  there is a byte specifying the number of
// bytes in the command sequence, followed by that many bytes of command data.
// Note:  This initialization sequence is derived from OSRAM App Note AN018.
//
//*****************************************************************************
static const unsigned char g_pucOSRAM128x64x4Init[] =
{
    //
    // Column Address
    //
    4, 0x15, 0, 63, 0xe3,

    //
    // Row Address
    //
    4, 0x75, 0, 63, 0xe3,

    //
    // Contrast Control
    //
    3, 0x81, 50, 0xe3,

    //
    // Half Current Range
    //
    2, 0x85, 0xe3,

    //
    // Display Re-map
    //
    3, 0xA0, OSRAM_INIT_REMAP, 0xe3,

    //
    // Display Start Line
    //
    3, 0xA1, 0, 0xe3,

    //
    // Display Offset
    //
    3, 0xA2, OSRAM_INIT_OFFSET, 0xe3,

    //
    // Display Mode Normal
    //
    2, 0xA4, 0xe3,

    //
    // Multiplex Ratio
    //
    3, 0xA8, 63, 0xe3,

    //
    // Phase Length
    //
    3, 0xB1, 0x22, 0xe3,

    //
    // Row Period
    //
    3, 0xB2, 70, 0xe3,

    //
    // Display Clock Divide
    //
    3, 0xB3, 0xF1, 0xe3,

    //
    // VSL
    //
    3, 0xBF, 0x0D, 0xe3,

    //
    // VCOMH
    //
    3, 0xBE, 0x02, 0xe3,

    //
    // VP
    //
    3, 0xBC, 0x10, 0xe3,

    //
    // Gamma
    //
    10, 0xB8, 0x01, 0x11, 0x22, 0x32, 0x43, 0x54, 0x65, 0x76, 0xe3,

    //
    // Set DC-DC
    3, 0xAD, 0x03, 0xe3,

    //
    // Display ON/OFF
    //
    2, 0xAF, 0xe3,
};

//*****************************************************************************
//
//! \internal
//!
//! Write a sequence of command bytes to the SSD0323 controller.
//!
//! The data is written in a polled fashion; this function will not return
//! until the entire byte sequence has been written to the controller.
//!
//! \return None.
//
//*****************************************************************************
static void
OSRAMWriteCommand(const unsigned char *pucBuffer, unsigned long ulCount)
{
    unsigned long ulTemp;

    //
    // Return iff SSI port is not enabled for OSRAM.
    //
    if(!g_bSSIEnabled)
    {
        return;
    }

    //
    // Clear the command/control bit to enable command mode.
    //
    GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_7, 0);

    //
    // Loop while there are more bytes left to be transferred.
    //
    while(ulCount != 0)
    {
        //
        // Write the next byte to the controller.
        //
        SSIDataPut(SSI0_BASE, *pucBuffer++);

        //
        // Dummy read to drain the fifo and time the GPIO signal.
        //
        SSIDataGet(SSI0_BASE, &ulTemp);

        //
        // Decrement the BYTE counter.
        //
        ulCount--;
    }
}

//*****************************************************************************
//
//! \internal
//!
//! Write a sequence of data bytes to the SSD0323 controller.
//!
//! The data is written in a polled fashion; this function will not return
//! until the entire byte sequence has been written to the controller.
//!
//! \return None.
//
//*****************************************************************************
static void
OSRAMWriteData(const unsigned char *pucBuffer, unsigned long ulCount)
{
    unsigned long ulTemp;

    //
    // Return iff SSI port is not enabled for OSRAM.
    //
    if(!g_bSSIEnabled)
    {
        return;
    }

    //
    // Set the command/control bit to enable data mode.
    //
    GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_7, GPIO_PIN_7);

    //
    // Loop while there are more bytes left to be transferred.
    //
    while(ulCount != 0)
    {
        //
        // Write the next byte to the controller.
        //
        SSIDataPut(SSI0_BASE, *pucBuffer++);

        //
        // Dummy read to drain the fifo and time the GPIO signal.
        //
        SSIDataGet(SSI0_BASE, &ulTemp);

        //
        // Decrement the BYTE counter.
        //
        ulCount--;
    }
}

//*****************************************************************************
//
//! Clears the OLED display.
//!
//! This function will clear the display RAM.  All pixels in the display will
//! be turned off.
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by
//! applications.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4Clear(void)
{
    static const unsigned char pucCommand1[] = { 0x15, 0, 63 };
    static const unsigned char pucCommand2[] = { 0x75, 0, 79 };
    unsigned long ulRow, ulColumn;
    static unsigned char pucZeroBuffer[8] = { 0, 0, 0, 0, 0, 0, 0, 0};

    //
    // Set the window to fill the entire display.
    //
    OSRAMWriteCommand(pucCommand1, sizeof(pucCommand1));
    OSRAMWriteCommand(pucCommand2, sizeof(pucCommand2));
    OSRAMWriteCommand(g_pucOSRAM128x64x4VerticalInc,
                      sizeof(g_pucOSRAM128x64x4VerticalInc));

    //
    // In vertical address increment mode, loop through each column, filling
    // each row with 0.
    //
    for(ulColumn = 0; ulColumn < (128/2); ulColumn++)
    {
        //
        // 8 rows (bytes) per row of text.
        //
        for(ulRow = 0; ulRow < 80; ulRow += 8)
        {
            OSRAMWriteData(pucZeroBuffer, sizeof(pucZeroBuffer));
        }
    }
}

//*****************************************************************************
//
//! Displays a string on the OLED display.
//!
//! \param pcStr is a pointer to the string to display.
//! \param ulX is the horizontal position to display the string, specified in
//! columns from the left edge of the display.
//! \param ulY is the vertical position to display the string, specified in
//! rows from the top edge of the display.
//! \param ucLevel is the 4-bit grey scale value to be used for displayed text.
//!
//! This function will draw a string on the display.  Only the ASCII characters
//! between 32 (space) and 126 (tilde) are supported; other characters will
//! result in random data being draw on the display (based on whatever appears
//! before/after the font in memory).  The font is mono-spaced, so characters
//! such as "i" and "l" have more white space around them than characters such
//! as "m" or "w".
//!
//! If the drawing of the string reaches the right edge of the display, no more
//! characters will be drawn.  Therefore, special care is not required to avoid
//! supplying a string that is "too long" to display.
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by
//! applications.
//!
//! \note Because the OLED display packs 2 pixels of data in a single byte, the
//! parameter \e ulX must be an even column number (e.g. 0, 2, 4, etc).
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4StringDraw(const char *pcStr, unsigned long ulX,
                        unsigned long ulY, unsigned char ucLevel)
{
    static unsigned char pucBuffer[8];
    unsigned long ulIdx1, ulIdx2;
    unsigned char ucTemp;

    //
    // Check the arguments.
    //
    ASSERT(ulX < 128);
    ASSERT((ulX & 1) == 0);
    ASSERT(ulY < 64);
    ASSERT(ucLevel < 16);

    //
    // Setup a window starting at the specified column and row, ending
    // at the right edge of the display and 8 rows down (single character row).
    //
    pucBuffer[0] = 0x15;
    pucBuffer[1] = ulX / 2;
    pucBuffer[2] = 63;
    OSRAMWriteCommand(pucBuffer, 3);
    pucBuffer[0] = 0x75;
    pucBuffer[1] = ulY;
    pucBuffer[2] = ulY + 7;
    OSRAMWriteCommand(pucBuffer, 3);
    OSRAMWriteCommand(g_pucOSRAM128x64x4VerticalInc,
                      sizeof(g_pucOSRAM128x64x4VerticalInc));

    //
    // Loop while there are more characters in the string.
    //
    while(*pcStr != 0)
    {
        //
        // Get a working copy of the current character and convert to an
        // index into the character bit-map array.
        //
        ucTemp = *pcStr;
        ucTemp &= 0x7F;
        if(ucTemp < ' ')
        {
            ucTemp = ' ';
        }
        else
        {
            ucTemp -= ' ';
        }

        //
        // Build and display the character buffer.
        //
        for(ulIdx1 = 0; ulIdx1 < 3; ulIdx1++)
        {
            //
            // Convert two columns of 1-bit font data into a single data
            // byte column of 4-bit font data.
            //
            for(ulIdx2 = 0; ulIdx2 < 8; ulIdx2++)
            {
                pucBuffer[ulIdx2] = 0;
                if(g_pucFont[ucTemp][ulIdx1*2] & (1 << ulIdx2))
                {
                    pucBuffer[ulIdx2] = ((ucLevel << 4) & 0xf0);
                }
                if((ulIdx1 < 2) &&
                    (g_pucFont[ucTemp][ulIdx1*2+1] & (1 << ulIdx2)))
                {
                    pucBuffer[ulIdx2] |= ((ucLevel << 0) & 0x0f);
                }
            }

            //
            // If there is room, dump the single data byte column to the
            // display.  Otherwise, bail out.
            //
            if(ulX < 126)
            {
                OSRAMWriteData(pucBuffer, 8);
                ulX += 2;
            }
            else
            {
                return;
            }
        }

        //
        // Advance to the next character.
        //
        pcStr++;
    }
}

//*****************************************************************************
//
//! Displays an image on the OLED display.
//!
//! \param pucImage is a pointer to the image data.
//! \param ulX is the horizontal position to display this image, specified in
//! columns from the left edge of the display.
//! \param ulY is the vertical position to display this image, specified in
//! rows from the top of the display.
//! \param ulWidth is the width of the image, specified in columns.
//! \param ulHeight is the height of the image, specified in rows.
//!
//! This function will display a bitmap graphic on the display.  Because of the
//! format of the display RAM, the starting column (/e ulX) and the number of
//! columns (/e ulWidth) must be an integer multiple of two.
//!
//! The image data is organized with the first row of image data appearing left
//! to right, followed immediately by the second row of image data.  Each byte
//! contains the data for two columns in the current row, with the leftmost
//! column being contained in bits 7:4 and the rightmost column being contained
//! in bits 3:0.
//!
//! For example, an image six columns wide and seven scan lines tall would
//! be arranged as follows (showing how the twenty one bytes of the image would
//! appear on the display):
//!
//! \verbatim
//!     +-------------------+-------------------+-------------------+
//!     |      Byte 0       |      Byte 1       |      Byte 2       |
//!     +---------+---------+---------+---------+---------+---------+
//!     | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 |
//!     +---------+---------+---------+---------+---------+---------+
//!     |      Byte 3       |      Byte 4       |      Byte 5       |
//!     +---------+---------+---------+---------+---------+---------+
//!     | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 |
//!     +---------+---------+---------+---------+---------+---------+
//!     |      Byte 6       |      Byte 7       |      Byte 8       |
//!     +---------+---------+---------+---------+---------+---------+
//!     | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 |
//!     +---------+---------+---------+---------+---------+---------+
//!     |      Byte 9       |      Byte 10      |      Byte 11      |
//!     +---------+---------+---------+---------+---------+---------+
//!     | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 |
//!     +---------+---------+---------+---------+---------+---------+
//!     |      Byte 12      |      Byte 13      |      Byte 14      |
//!     +---------+---------+---------+--3------+---------+---------+
//!     | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 |
//!     +---------+---------+---------+---------+---------+---------+
//!     |      Byte 15      |      Byte 16      |      Byte 17      |
//!     +---------+---------+---------+---------+---------+---------+
//!     | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 |
//!     +---------+---------+---------+---------+---------+---------+
//!     |      Byte 18      |      Byte 19      |      Byte 20      |
//!     +---------+---------+---------+---------+---------+---------+
//!     | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 | 7 6 5 4 | 3 2 1 0 |
//!     +---------+---------+---------+---------+---------+---------+
//! \endverbatim
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by`
//! applications.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4ImageDraw(const unsigned char *pucImage, unsigned long ulX,
               unsigned long ulY, unsigned long ulWidth,
               unsigned long ulHeight)
{
    static unsigned char pucBuffer[8];

    //
    // Check the arguments.
    //
    ASSERT(ulX < 128);
    ASSERT((ulX & 1) == 0);
    ASSERT(ulY < 64);
    ASSERT((ulX + ulWidth) <= 128);
    ASSERT((ulY + ulHeight) <= 64);
    ASSERT((ulWidth & 1) == 0);

    //
    // Setup a window starting at the specified column and row, and ending
    // at the column + width and row+height.
    //
    pucBuffer[0] = 0x15;
    pucBuffer[1] = ulX / 2;
    pucBuffer[2] = (ulX + ulWidth - 2) / 2;
    OSRAMWriteCommand(pucBuffer, 3);
    pucBuffer[0] = 0x75;
    pucBuffer[1] = ulY;
    pucBuffer[2] = ulY + ulHeight - 1;
    OSRAMWriteCommand(pucBuffer, 3);
    OSRAMWriteCommand(g_pucOSRAM128x64x4HorizontalInc,
                      sizeof(g_pucOSRAM128x64x4HorizontalInc));

    //
    // Loop while there are more rows to display.
    //
    while(ulHeight--)
    {
        //
        // Write this row of image data.
        //
        OSRAMWriteData(pucImage, (ulWidth / 2));

        //
        // Advance to the next row of the image.
        //
        pucImage += (ulWidth / 2);
    }
}

//*****************************************************************************
//
//! Enable the SSI component of the OLED display driver.
//!
//! \param ulFrequency specifies the SSI Clock Frequency to be used.
//!
//! This function initializes the SSI interface to the OLED display.
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by
//! applications.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4Enable(unsigned long ulFrequency)
{
    unsigned long ulTemp;

    //
    // Disable the SSI port.
    //
    SSIDisable(SSI0_BASE);

    //
    // Configure the SSI0 port for master mode.
    //
    SSIConfig(SSI0_BASE, SSI_FRF_MOTO_MODE_2, SSI_MODE_MASTER, ulFrequency, 8);

    //
    // (Re)Enable SSI control of the FSS pin.
    //
    GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_3);
    GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_3, GPIO_STRENGTH_8MA,
                     GPIO_PIN_TYPE_STD_WPU);

    //
    // Enable the SSI port.
    //
    SSIEnable(SSI0_BASE);

    //
    // Drain the receive fifo.
    //
    while(SSIDataNonBlockingGet(SSI0_BASE, &ulTemp) != 0)
    {
    }

    //
    // Indicate that the OSRAM driver can use the SSI Port.
    //
    g_bSSIEnabled = true;
}

//*****************************************************************************
//
//! Enable the SSI component of the OLED display driver.
//!
//! \param ulFrequency specifies the SSI Clock Frequency to be used.
//!
//! This function initializes the SSI interface to the OLED display.
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by
//! applications.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4Disable(void)
{
    unsigned long ulTemp;

    //
    // Indicate that the OSRAM driver can no longer use the SSI Port.
    //
    g_bSSIEnabled = false;

    //
    // Drain the receive fifo.
    //
    while(SSIDataNonBlockingGet(SSI0_BASE, &ulTemp) != 0)
    {
    }

    //
    // Disable the SSI port.
    //
    SSIDisable(SSI0_BASE);

    //
    // Disable SSI control of the FSS pin.
    //
    GPIODirModeSet(GPIO_PORTA_BASE, GPIO_PIN_3, GPIO_DIR_MODE_OUT);
    GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_3, GPIO_STRENGTH_8MA,
                     GPIO_PIN_TYPE_STD_WPU);
    GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_3, GPIO_PIN_3);

}

//*****************************************************************************
//
//! Initialize the OLED display.
//!
//! \param ulFrequency specifies the SSI Clock Frequency to be used.
//!
//! This function initializes the SSI interface to the OLED display and
//! configures the SSD0323 controller on the panel.
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by
//! applications.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4Init(unsigned long ulFrequency)
{
    unsigned long ulIdx;

    //
    // Enable the SSI0 and GPIO port  blocks as they are needed by this driver.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

    //
    // Configure the SSI0CLK and SSIOTX pins for SSI operation.
    //
    GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_5);
    GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_2, GPIO_STRENGTH_8MA,
                     GPIO_PIN_TYPE_STD_WPU);
    GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_3, GPIO_STRENGTH_8MA,
                     GPIO_PIN_TYPE_STD_WPU);
    GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_5, GPIO_STRENGTH_8MA,
                     GPIO_PIN_TYPE_STD_WPU);

    //
    // Configure the PC7 pin as a D/Cn signal for OLED device.
    //
    GPIODirModeSet(GPIO_PORTC_BASE, GPIO_PIN_7, GPIO_DIR_MODE_OUT);
    GPIOPadConfigSet(GPIO_PORTC_BASE, GPIO_PIN_7, GPIO_STRENGTH_8MA,
                     GPIO_PIN_TYPE_STD);
    GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_7, GPIO_PIN_7);

    //
    // Configure and enable the SSI0 port for master mode.
    //
    OSRAM128x64x4Enable(ulFrequency);

    //
    // Clear the frame buffer.
    //
    OSRAM128x64x4Clear();

    //
    // Initialize the SSD0323 controller.  Loop through the initialization
    // sequence array, sending each command "string" to the controller.
    //
    for(ulIdx = 0; ulIdx < sizeof(g_pucOSRAM128x64x4Init);
        ulIdx += g_pucOSRAM128x64x4Init[ulIdx] + 1)
    {
        //
        // Send this command.
        //
        OSRAMWriteCommand(g_pucOSRAM128x64x4Init + ulIdx + 1,
                          g_pucOSRAM128x64x4Init[ulIdx] - 1);
    }
}

//*****************************************************************************
//
//! Turns on the OLED display.
//!
//! This function will turn on the OLED display, causing it to display the
//! contents of its internal frame buffer.
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by
//! applications.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4DisplayOn(void)
{
    unsigned long ulIdx;

    //
    // Initialize the SSD0323 controller.  Loop through the initialization
    // sequence array, sending each command "string" to the controller.
    //
    for(ulIdx = 0; ulIdx < sizeof(g_pucOSRAM128x64x4Init);
        ulIdx += g_pucOSRAM128x64x4Init[ulIdx] + 1)
    {
        //
        // Send this command.
        //
        OSRAMWriteCommand(g_pucOSRAM128x64x4Init + ulIdx + 1,
                          g_pucOSRAM128x64x4Init[ulIdx] - 1);
    }
}

//*****************************************************************************
//
//! Turns off the OLED display.
//!
//! This function will turn off the OLED display.  This will stop the scanning
//! of the panel and turn off the on-chip DC-DC converter, preventing damage to
//! the panel due to burn-in (it has similar characters to a CRT in this
//! respect).
//!
//! This function is contained in <tt>osram128x64x4.c</tt>, with
//! <tt>osram128x64x4.h</tt> containing the API definition for use by
//! applications.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAM128x64x4DisplayOff(void)
{
    static const unsigned char pucCommand1[] =
    {
        0xAE, 0xAD, 0x02
    };

    //
    // Turn off the DC-DC converter and the display.
    //
    OSRAMWriteCommand(pucCommand1, sizeof(pucCommand1));
}

//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************