Lpc2000

Read page 9 of the lcd data sheet, you will have to satisfy the min and 
max DCLK of 21MHz to 32MHz :-o

You are not even using fast I/O anyway but you won't get that update 
rate in software, certainly not C, you will have to hand craft it in 
assembler. If you are not adept in hardware or assembler you should give 
up now (really).

As always .... RT*M and with this sort of stuff don't even bother unless 
you have a scope handy and know how to use it.

*Peter*


thal_munki wrote:
> I am attempting to link an ARM microcontroller (LPC2103) and a color 
> TFT LCD screen (LP104V2 , 640x480 , TTL interface). The screen's 
> datasheet is found here: www.larwe.com/technical/datasheets/lp104v2-w.
> pdf 
> The code I'm using to run the screen is shown below 
>
>
> Code:	
>
>
> #include <targets/LPC210x.h> 
>
> //--------------------------------------------------------------------
> ------ 
> long pixel_number=0;        //Horizontal position of scan 
> long row_number=0;          //Verical position of scan 
> long delay_variable=0; 
> #define DCLK    0x00000004      //P0.2 
> #define HSYNC   0x00000008   //P0.3 
> #define VSYNC   0x00000010   //P0.4 
> #define DTMG    0x00000020   //P0.5 
> #define DATA    0x00000040   //P0.6 (This is blue data only) 
> #define button  0x00008000      //P0.15 
> //--------------------------------------------------------------------
> ------ 
>
>
> static void 
> ledInit() 
> { 
>   IODIR |= 0x04000000; 
>   IOSET = 0x04000000; 
> } 
>
> static void 
> ledOn(void) 
> { 
>   IOCLR = 0x04000000; 
> } 
>
> static void 
> ledOff(void) 
> { 
>   IOSET = 0x04000000; 
> } 
>
> void 
> delay(int d) 
> {      
>   for(; d; --d); 
> } 
> //--------------------------------------------------------------------
>
> void LCD_config(void){      //Configure GPIO for LP104v2 
>       
>         IODIR=0xFF;   //P0.0 : P0.7 set to outputs 
>    IOCLR=0x00;   //P0.0 : P0.7 LOW 
>    pixel_number=0; 
>    row_number=0; 
>    IOSET=HSYNC;   //H sync high 
>    IOSET=VSYNC;   //V sync high 
>         IOSET=DATA;     //Data high 
> } 
>     
> void LCD_page(void){        //Scan a page into LP104v2 
>     IOCLR=VSYNC;       //Lower V sync 
>     for(delay_variable=0; delay_variable<3397; delay_variable++); 
>                             //64uS delay 
>     IOSET=VSYNC;       //V sync high 
>     for(delay_variable=0; delay_variable<554347; delay_variable++); 
>                         //1.02mS delay 
>     do{ 
>         IOCLR=HSYNC;   //Lower H sync 
>         for(delay_variable=0; delay_variable<200; delay_variable++); 
>                             //3.77uS delay 
>         IOSET=HSYNC;   //H sync high 
>         for(delay_variable=0; delay_variable<100; delay_variable++); 
>                             //1.89uS delay 
>         IOSET=DTMG;    //DTMG high 
>         do{ 
>             IOSET=DCLK;    //Data clock high 
>             
>             IOCLR=DCLK;    //Data clock low 
>             pixel_number++; //Increment pixel count 
>         } while (pixel_number<639); 
>         pixel_number=0; 
>         for(delay_variable=0; delay_variable<49; delay_variable++); 
>                             //0.94uS delay 
>         row_number++;  //Increment line number 
>     } while (row_number<478); 
>     for(delay_variable=0; delay_variable<190217; delay_variable); 
>                             //0.35mS delay 
>     row_number=0;  //Reset line counter 
> } 
>
>
>
> //--------------------------------------------------------------------
> ------ 
> int 
> main(void) 
> { 
>
>   MAMCR = 2; 
>   ledInit(); 
>   ledOn(); 
>   delay(100000);  
>   ledOff(); 
>   delay(100000); 
>   LCD_config(); 
>   while (1) 
>     { 
>     LCD_page(); 
>     } 
>   return 0; 
> } 
>
> 	
>
>
> I attached the data line to the Blue LSB on the LCD screen 
> (Theoretically this will produce a dark blue when high). The only 
> problem is that this is not happening. Nothing happens. I know the ARM 
> is running and the startup code is correct because it flashes the 
> status LED as stated in the code, and I know the LCD is functional 
> because for a fraction of a second it goes dark (this is not a result 
> of the ARM, it happens whenever power is applied to the screen. Where 
> have I gone wrong? help, anyone?