This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

LPC2478 LCD controller setup

I hope someone can help me or give me some clues to help solve my problem.

I am having some trouble getting the LPC2478 LCD controller to do anything other than output the LCDDCLK signal. I am using the following TFT panel setup and after the LCD controller is enabled and powered up I see the signals LCDPWR, LCDFP, LCDLP go high but no toggling.

All other signals, apart from the LCDDCLK, are always low. I can change the LCDCLK frequency so I would assume the LCD controller is correctly powered up and switch on.

I would assume that with the timings setup I would see LCDFP, LCDEN toggling regardless of the graphics RAM buffer, is this correct?

My setup code is:

int LCD_Initialise ( void )
{
        uint16_t regValue = 0;
        uint16_t *pPal = NULL;
        uint32_t i = 0;

        /* LCD specific setup  */
        uint16_t hbp = 2;               /* Horizontal back porch */
        uint16_t hfp = 2;               /* Horizontal front porch */
        uint16_t hsw = 10;              /* HSYNC pulse width */
        uint16_t ppl = 800;             /* Pixels per line */
        uint16_t vbp = 2;               /* Vertical back porch */
        uint16_t vfp = 2;               /* Vertical front porch */
        uint16_t vsw = 4;               /* VSYNC pulse width */
        uint16_t lpp = 480;             /* Lines per panel */



        /************ LPC2478 LCD controller setup ***************/
        PCONP |= PCONP_PCLCD;           /* Power Control for LCD controller */

        /* Configure LCD GPIO pins */
        PINSEL11 = 0x0000000F; /* Set TFT 24 bit and enable LCD port */
        PINSEL10 = 0;   /* Disable Embedded Trace Module (ETM) */

        PINSEL0  = (PINSEL0 & 0xFFF000FF) | 0x00055500;/* Enable LCDVD[0,1,8,9,16,17] */
        PINSEL3  = (PINSEL3 & 0xF00000FF) | 0x05555500;/* Enable LCDVD[10..15,20..23] */
        PINSEL4  = (PINSEL4 & 0xF0300000) | 0x054FFFFF;/* Enable LCDPWR, LCDLE, LCDDCLK, LCDFP, LCDENAB, LCDLP,LCDVD[4..7,18,19], LCDCLKIN */
        PINSEL9  = (PINSEL9 & 0xF0FFFFFF) | 0x0A000000;/* Enable LCDVD[2..3] */


        /* Disable the display */
        LCD_CTRL &= ~LCD_CTRL_LCDEN;

        /* Setup horizontal and vertical timing */

        regValue= ( ((((ppl/16)-1)&0x3F) << 2)
                        | (( (hsw-1)    &0xFF) << 8)
                        | (( (hfp-1)    &0xFF) << 16)
                        | (( (hbp-1)    &0xFF) << 24) );

        LCD_TIMH = regValue;   /* Horizontal timing registers */

        regValue =((((lpp-1) &0x3FF) << 0)
                        | (((vsw-1) &0x03F) << 10)
                        | (((vfp-1) &0x0FF) << 16)
                        | (((vbp-1) &0x0FF) << 24) );

        LCD_TIMV = regValue;    /* Vertical timing registers */



        /* Setup polarities of signals */
        regValue = 0;

        /* Clocks per line (CPL) */
        regValue |= ( ( (ppl-1) & 0x3FF) << 16);

        /* Panel clock divisor, lower 5 bits */
        regValue |=  0x04;

        LCD_POL = regValue;             /* Set the polarity register */


        /* Line end control not required */
        LCD_LE = 0;

        /* Disable interrupts */
        LCD_INTMSK = 0;



        /* 24 bits per pixel */
        regValue = LCD_CTRL_LCDBPP_24;

        /* TFT display */
        regValue |= LCD_CTRL_LCDTFT;

        LCD_CTRL = regValue;    /* Set the LCD control register */


        /* LCD configuration register, prescaler */
        LCD_CFG = 0x00000000;

        /* LCD enable */
        LCD_CTRL |= LCD_CTRL_LCDEN;

        /* Power on LCD */
        LCD_CTRL |= LCD_CTRL_LCDPWR;

   return (PASS);
}

Looking at the uVision debugger peripherals for the Pin Connect shows the GPIO set up correctly, as I can see, with values of:

PINSEL0 = 0x00555550
PINSEL1 = 0x00000000
PINSEL2 = 0x00000000
PINSEL3 = 0x05555500
PINSEL4 = 0x054FFFFF
PINSEL5 = 0x55010115
PINSEL6 = 0x55555555
PINSEL7 = 0x55555555
PINSEL8 = 0x55555555
PINSEL9 = 0x5A055555
PINSEL10= 0x00000000

I would be grateful for any suggestion to why I'm not seeing the timing signals output.

Thanks in advance.