uilcd.c

来自「基于EP7312的MP3播放器源代码,包括MCU和PC端代码.」· C语言 代码 · 共 533 行 · 第 1/2 页

    //
    // Assert nWR.
    //
    ulLCDValue &= ~HwLCD_nWR;
    *pulPtr = ulLCDValue;

    //
    // Wait for 450ns.
    //
    for(ulLoop = 0; ulLoop < 8; ulLoop++)
    {
    }

    //
    // De-assert nWR.
    //
    ulLCDValue |= HwLCD_nWR;
    *pulPtr = ulLCDValue;

    //
    // De-assert nCS.
    //
    ulLCDValue |= HwLCD_nCS;
    *pulPtr = ulLCDValue;
}

//****************************************************************************
//
// LCDWriteData writes the given value to the data register of the HD66410.
//
//****************************************************************************
static void
LCDWriteData(unsigned long ulValue)
{
    volatile unsigned long *pulPtr = (unsigned long *)HwLCDAddress;
    unsigned long ulLoop;

    //
    // Assert nCS, set RS high, and write the value.
    //
    ulLCDValue &= ~(HwLCD_nCS | HwLCD_Data);
    ulLCDValue |= HwLCD_RS | ulValue;
    *pulPtr = ulLCDValue;

    //
    // Assert nWR.
    //
    ulLCDValue &= ~HwLCD_nWR;
    *pulPtr = ulLCDValue;

    //
    // Wait for 450ns.
    //
    for(ulLoop = 0; ulLoop < 8; ulLoop++)
    {
    }

    //
    // De-assert nWR.
    //
    ulLCDValue |= HwLCD_nWR;
    *pulPtr = ulLCDValue;

    //
    // De-assert nCS.
    //
    ulLCDValue |= HwLCD_nCS;
    *pulPtr = ulLCDValue;
}

//****************************************************************************
//
// LCDOn turns on the LCD display.
//
//****************************************************************************
static void
LCDOn(void)
{
    //
    // Turn on the display bit in the first control regiser.
    //
    LCDWriteIndex(LCD_REG_CONTROL1);
    LCDWriteData(LCD_CONTROL1_DISP | LCD_CONTROL1_PWR | LCD_CONTROL1_CNF);
}

//****************************************************************************
//
// LCDOff turns off the LCD display.
//
//****************************************************************************
static void
LCDOff(void)
{
    //
    // Turn off the display bit in the first control regiser.
    //
    LCDWriteIndex(LCD_REG_CONTROL1);
    LCDWriteData(LCD_CONTROL1_PWR | LCD_CONTROL1_CNF);
}

//****************************************************************************
//
// LCDDisplayImage draws an image on the LCD.  The image is organized in
// column major order.
//
//****************************************************************************
static void
LCDDisplayImage(const unsigned char *pucData, unsigned long ulX,
                unsigned long ulY, unsigned long ulWidth,
                unsigned long ulHeight)
{
    unsigned long ulDX, ulDY;

    //
    // Loop through the columns in the image.
    //
    for(ulDX = 0; ulDX < ulWidth; ulDX++)
    {
        //
        // Set the column address.
        //
        LCDWriteIndex(LCD_REG_X);
        LCDWriteData(ulX + ulDX);

        //
        // Set the row address.
        //
        LCDWriteIndex(LCD_REG_Y);
        LCDWriteData(ulY);

        //
        // Select the data register.
        //
        LCDWriteIndex(LCD_REG_DATA);

        //
        // Loop through the rows in the image.
        //
        for(ulDY = 0; ulDY < ulHeight; ulDY++)
        {
            //
            // Write the next value to the LCD.
            //
            LCDWriteData(*pucData++);
        }
    }
}

//****************************************************************************
//
// UIEnable initializes the user interface.
//
//****************************************************************************
void
UIEnable(void)
{
    volatile unsigned long *pulPtr = (unsigned long *)HwLCDAddress;
    long lCount;

    //
    // Reset the HD66410.
    //
    ulLCDValue = HwLCD_nCS | HwLCD_nWR | HwLCD_nRD;
    *pulPtr = ulLCDValue;

    //
    // Delay for 1ms.
    //
    for(lCount = 0; lCount < 49152; lCount++)
    {
    }

    //
    // Bring the HD66410 out of reset.
    //
    ulLCDValue |= HwLCD_nRES;
    *pulPtr = ulLCDValue;

    //
    // Set the index register to control register one.
    //
    LCDWriteIndex(LCD_REG_CONTROL1);

    //
    // Power on the HD66410.
    //
    LCDWriteData(LCD_CONTROL1_PWR);

    //
    // Configure the HD66410.
    //
    LCDWriteData(LCD_CONTROL1_PWR | LCD_CONTROL1_CNF);
}

//****************************************************************************
//
// UIDisable shuts down the user interface.
//
//****************************************************************************
void
UIDisable(void)
{
    //
    // Turn off the display bit in the first control register.
    //
    LCDWriteIndex(LCD_REG_CONTROL1);
    LCDWriteData(LCD_CONTROL1_PWR | LCD_CONTROL1_CNF);

    //
    // Turn off the power bit in the first control register.
    //
    LCDWriteData(LCD_CONTROL1_CNF);
}

//****************************************************************************
//
// UIRequestUpdate displays a message on the LCD telling the user to update
// the player software.
//
//****************************************************************************
void
UIRequestUpdate(void)
{
    //
    // Turn off the LCD.
    //
    LCDOff();

    //
    // Display the update request image on the LCD.
    //
    LCDDisplayImage(pucNeedUpdate, 0, 0, 16, 33);

    //
    // Turn on the LCD.
    //
    LCDOn();
}

//****************************************************************************
//
// UIUpdate displays a message on the LCD telling the user that an update is
// in progress.
//
//****************************************************************************
void
UIUpdate(void)
{
    //
    // Turn off the LCD.
    //
    LCDOff();

    //
    // Display the update in progress image on the LCD.
    //
    LCDDisplayImage(pucUpdating, 0, 0, 16, 33);

    //
    // Turn on the LCD.
    //
    LCDOn();
}

#endif