how to drive 7" TFT LCD using LPC4357

lpcware — Wed, 15 Jun 2016 18:47:51 GMT

Content originally posted in LPCWare by szszjdb on Thu Jul 25 21:13:59 MST 2013
DERR FRIEND ,

I'm using the mcb4300 demo for LPC4357. The drive is for 4.3" TFT. When I move to 7" TFT and change some config , the TFT cann't work. The original 4,3" and the 7" config is as below:

//for 4.3"
LPC_LCD->TIMH = (40   << 24) |       /* Horizontal back porch              */
                   (5    << 16) |       /* Horizontal front porch             */
                   (2    << 8) |       /* Horizontal sync pulse width        */
                   (29   << 2) ;       /* Pixels-per-line 272=16*(16+1) 480=16*(29+1) */
LPC_LCD->TIMV = (8    << 24) |       /* Vertical back porch                */
                   (8    << 16) |       /* Vertical front porch               */
                   (2    << 10) |       /* Vertical sync pulse width          */
                   (271 << 0) ;       /* Lines per panel                    */
LPC_LCD->POL   = (1    << 26) |       /* Bypass pixel clock divider         */
                   (479 << 16) |       /* Clocks per line: num of LCDCLKs    */
                   (0    << 13) |       /* Invert panel clock                 */
                   (1    << 12) |       /* Invert HSYNC                       */
                   (1    << 11) ;       /* Invert VSYNC                       */
LPC_LCD->LE    = (1    << 16) |       /* LCDLE Enabled: 1, Disabled: 0      */
                   (9    << 0) ;       /* Line-end delay: LCDCLK clocks - 1 */
LPC_LCD->CTRL = (1    << 11) |       /* LCD Power Enable                   */
                   (1    << 5) |       /* 0 = STN display, 1: TFT display    */
                   (6    << 1) |       /* Bits per pixel: 16bpp              */
                                                                         (1    << 8);                                /* Red and blue swapped                                                                */

//for 7"

        LPC_LCD->TIMH = (45   << 24) |       /* Horizontal back porch              */
                   (17    << 16) |       /* Horizontal front porch             */
                   (2    << 8) |       /* Horizontal sync pulse width        */
                   (49   << 2) ;       /* Pixels-per-line 272=16*(16+1) 480=16*(29+1) 800=16*(49+1) */
LPC_LCD->TIMV = (22    << 24) |       /* Vertical back porch                */
                   (22    << 16) |       /* Vertical front porch               */
                   (2    << 10) |       /* Vertical sync pulse width          */
                   (479 << 0) ;       /* Lines per panel                    */
LPC_LCD->POL   = (1    << 26) |       /* Bypass pixel clock divider         */
                   (799 << 16) |       /* Clocks per line: num of LCDCLKs    */
                   (0    << 13) |       /* Invert panel clock                 */
                   (1    << 12) |       /* Invert HSYNC                       */
                   (1    << 11) ;       /* Invert VSYNC                       */
LPC_LCD->LE    = (1    << 16) |       /* LCDLE Enabled: 1, Disabled: 0      */
                   (9    << 0) ;       /* Line-end delay: LCDCLK clocks - 1 */
LPC_LCD->CTRL = (1    << 11) |       /* LCD Power Enable                   */
                   (1    << 5) |       /* 0 = STN display, 1: TFT display    */
                   (6    << 1) |       /* Bits per pixel: 16bpp              */
                                                                         (1    << 8);                                /* Red and blue swapped

Any body can help me ?
Thanks!

Re: how to drive 7" TFT LCD using LPC4357

lpcware — Wed, 15 Jun 2016 18:47:52 GMT

Content originally posted in LPCWare by szszjdb on Fri Jul 26 20:21:53 MST 2013
I'm still in the issue. Does anybody can help?

Thanks!

Re: how to drive 7" TFT LCD using LPC4357

lpcware — Wed, 15 Jun 2016 18:47:52 GMT

Content originally posted in LPCWare by Martin84 on Sat Jul 27 05:40:57 MST 2013
Hi,

you have to compare the settings with the datasheet of the 7" Display. What Display is it??? Did anythhing happens on the display or is there nothing to see?

Does the backlight work correctly?

Regards,

Martin

Re: how to drive 7" TFT LCD using LPC4357

lpcware — Wed, 15 Jun 2016 18:47:53 GMT

Content originally posted in LPCWare by suckfish on Sat Jul 27 16:46:40 MST 2013
Did you remember to raise the pixel clock rate as required also?

Check what the panel needs for the clock/hsync/vsync polarities.

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