How to configure a 10 inch TFT LCD in ARM Cortex-M3?

good evening to every one..i am new to this website..i want to know how to use 10 inch TFT display and LVDS colour formet??? can anyone help me..? thanks advance

Hi jensbauer.,

first thanks for your response..i am new for TFT lcd.I attached my details.If u got any idea tell me.i am facing problem in 10" TFT lcd interfacing.problem is lcd back light is flikering.i attached a file see that.

1)my TFT pannel WY101ML308HS18A is a Active matrix TFT panels and it can support up to 24-bit bus.my controller is lpc1788 so it has inbuild lcd controller and it can support .

2)the controller has a parallel bit interface, the panel has a LVDS interface.But here i am using a SN75LVDS83B to convert the 24 bit parallel data into LVDS format..and sending to TFT lcd pannel via 4 bus.

3)i am using 256Mbit (16M x16) Synchronous DRAM for storing image buffer.i thought its enough..and SDRAM WORKING GOOD .i cheked it.

4)i thought the problem is in lcd initialization.i need the exact value for hsync and vsync front porch,back porch ,horizontal and vertical pulse width value.

i attached my lcd initialization code .if you got any idea tell me..thanks advance.

 code:

#include "LPC177x_8x.h" // Device header

#include "TFT_LCD.H"

#include "SDRAM.H"

#include "math.h"

#include "string.h"

#include "ASCII_LIB.h"

#include "UART.h"

#include "ICONS_LIB.h"

#include "TIMER.H"

uint8_t start_bit, stop_bit, start_bit_for_ascii11, stop_bit_for_ascii11;

#define WHITE 0xFFFFFF

#define BLACK 0x000000

#define BLUE 0xFF0000

#define RED 0x0000FF

#define GREEN 0x00FF00

#define YELLOW 0x00FFFF

#define PURPLE COLOUR(127,0,255)

#define ORANGE 0X00A5FF //COLOUR(255,165,0)

#define LIGHTBLUE COLOUR(23,208,255)

#define SKYBLUE 0xFFFF00 //COLOUR(0,255,255)

#define NAVY_BLUE COLOUR(0,0,128)

#define GREY COLOUR(61,60,59)

#define COMM_BOARDER_GREY COLOUR(121,120,119)

#define RTC_GREY COLOUR(0,0,50)

#define BLACK_Grey COLOUR(10,10,10)

#define SILVER COLOUR(192,192,192)

#define TOMATO_RED COLOUR(255,99,71)

#define SPRING_GREEN COLOUR(0,255,127)

//#define COLOUR(R,G,B) ((B<<16)|(G<<8)|(R<<0))

#define LCD_VRAM_BASE_ADDR ((unsigned long )SDRAM_BASE_ADDRESS)

#define TFT_H_SIZE 1024

#define TFT_H_PULSE 40 //1//30-- 606088

#define TFT_H_FRONTPORCH 56 //40//210

#define TFT_H_BACKPORCH 124 //88//16

#define TFT_V_SIZE 600

#define TFT_V_PULSE 48 //3//13--602223

#define TFT_V_FRONTPORCH 28 //3//22

#define TFT_V_BACKPORCH 56 //3//10

#define HORIZONTAL 0XFF

#define VERTICAL 0X00

/*******************************************************************************

* Function Name : LCD_ClockDivide

* Description : find closest clock divider to get the desired clock rate.

* Input : None

* Output : None

* Return : None

* Attention : None

*******************************************************************************/

static uint32_t LCD_ClockDivide(uint32_t LCD_clock)

{

uint32_t divide, result;

divide = 1;

while ( ( (120000000 / divide) > LCD_clock ) && (divide <= 0x3F) )

{

divide++;

}

if (divide <= 1)

{

result = (1 << BCD_BIT); /* Skip divider logic if clock divider is 1 */

}

else

{

result = 0 | (((divide >> 0) & 0x1F) | (((divide >> 5) & 0x1F) << 27));

}

return result;

}

/*************************************************************************************

1. Function name: glcd_initialization

2. Purpose : glcd initialisation

3. Input : void

4. Return type : void

*************************************************************************************/

void glcd_initialization (){

unsigned long i;

unsigned long *pDst = (unsigned long *)LCD_VRAM_BASE_ADDR;

  IOCON_P0_4 = LCD_RED;

IOCON_P0_5 = LCD_RED;

  IOCON_P4_28 = LCD_RED;

  IOCON_P4_29 = LCD_RED;

  IOCON_P2_6 = LCD_RED;

  IOCON_P2_7 = LCD_RED;

  IOCON_P2_8 = LCD_RED;

  IOCON_P2_9 = LCD_RED;

  IOCON_P0_6 = LCD_GREEN;

  IOCON_P0_7 = LCD_GREEN;

  IOCON_P1_20 = LCD_GREEN;

  IOCON_P1_21 = LCD_GREEN;

  IOCON_P1_22 = LCD_GREEN;

  IOCON_P1_23 = LCD_GREEN;

  IOCON_P1_24 = LCD_GREEN;

  IOCON_P1_25 = LCD_GREEN;

  IOCON_P0_8 = LCD_BLUE ;

  IOCON_P0_9 = LCD_BLUE ;

  IOCON_P2_12 = LCD_BLUE ;

  IOCON_P2_13 = LCD_BLUE ;

  IOCON_P1_26 = LCD_BLUE ;

  IOCON_P1_27 = LCD_BLUE ;

  IOCON_P1_28 = LCD_BLUE ;

  IOCON_P1_29 = LCD_BLUE ;

  IOCON_P2_2 = LCD_DCLK ;

  IOCON_P2_5 = LCD_HSYNC;

  IOCON_P2_3 = LCD_VSYNC;

  IOCON_P2_4 = LCD_LCDDEN;

  IOCON_P2_0 = LCD_PWR;

LPC_SC->PCONP |= 1<<0;

LCD_CTRL_REG &= 0;

LCD_CTRL_REG |= (5<<1)|LCDTFT;

LCD_CTRL_REG &= ~BGR;

LCD_CTRL_REG &= ~LCDPWR;

LCD_POL_REG &= 0;

LCD_POL_REG |=(1<<0);

LCD_POL_REG |=IVS|IHS;

LCD_POL_REG |= (TFT_H_SIZE-1)<<16;

LPC_LCD->POL |= (LCD_ClockDivide(72300000)<<0);

LPC_SC->LCD_CFG =0;// 120000000 / ((unsigned long) C_GLCD_PIX_CLK); 120 MHZ

/*Refresh time 41msec*/

LCD_TIMH_REG &= 0;

LCD_TIMH_REG |= (TFT_H_BACKPORCH - 1)<<24;

LCD_TIMH_REG |= (TFT_H_FRONTPORCH - 1)<<16;

LCD_TIMH_REG |= (TFT_H_PULSE - 1)<<8; //*same

LCD_TIMH_REG |= ((TFT_H_SIZE/16) - 1)<<2; //*same

LCD_TIMV_REG &= 0;

LCD_TIMV_REG |= (TFT_V_BACKPORCH)<<24;

LCD_TIMV_REG |= (TFT_V_FRONTPORCH)<<16;

LCD_TIMV_REG |= (TFT_V_PULSE - 1)<<10;

LCD_TIMV_REG |= TFT_V_SIZE - 1;

LCD_UPBASE_REG = LCD_VRAM_BASE_ADDR & ~7UL ;

LCD_LPBASE_REG = LCD_VRAM_BASE_ADDR & ~7UL ;

for( i = 0; (TFT_H_SIZE * TFT_V_SIZE) > i; i++)

  *pDst++ = WHITE;

  for(i = 10000; i; i--);

// LCD_CTRL_REG |= LCDPWR| LCD_EN;

LCD_CTRL_REG |= LCDPWR;//| LCD_EN;

}

void lcd_powerenable(){

LCD_CTRL_REG |= LCD_EN;

}

void lcd_powerdisable(){

LCD_CTRL_REG &= LCD_EN;

}

int main()

{

int a=102,b=290;

sdram_initialization();

glcd_initialization ();

lcd_powerenable();

set_color(WHITE);

//init_timer1(1000);

while(1)

{

// lcd_color_pixel(102,190,RED); lcd_color_pixel(102,191,RED); lcd_color_pixel(102,192,RED);

lcd_14arial_writestr(a,b,"WELCOME",'B',RED,WHITE);// Its a function for displaying 14 Arial font character. a=horizontal location,b=vertical location,welcome =character should display in TFT lcd(accessing from ASCII Library), red=character color,white=screen border color.

}

}

i am also getting character in lcd but back light is flickering .need help..thanks advance.