Problem SSD1963 and STM32F4 Discovery

TechNet
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Joined: Sat Jul 20, 2013 8:44 pm

Problem SSD1963 and STM32F4 Discovery

Postby TechNet » Sun Jul 21, 2013 1:51 pm

Hi,

I have lately bought LCD panel like this http://www.ebay.com/itm/7-TFT-LCD-Module-800-480-with-Touch-Panel-SSD1963-ARM-STM32-code-Cortex-M3-/120963914141 but I can't make it work properly :x Some colors are inverted and generally the image is jagged. I rode this topic http://forum.chibios.org/phpbb/viewtopic.php?f=11&t=1133 but it didn't help. Panel is connected through 20 cm wires. I'm using FSMC.

My gdisp_lld_panel.h

Code: Select all

/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://chibios-gfx.com/license.html
 */

/**
 * @file    drivers/gdisp/SSD1963/gdisp_lld_panel_example.h
 * @brief   TFT LCD panel properties.
 *
 * @addtogroup GDISP
 * @{
 */

#ifndef _GDISP_LLD_PANEL_H
#define _GDISP_LLD_PANEL_H

/* LCD panel specs */

/* The timings need to follow the datasheet for your particular TFT/LCD screen (the actual screen, not the controller)
*** Datasheets normally use a specific set of timings and acronyms, their value refers to the number of pixel clocks
** Non-display periods refer to pulses/timings that occur before or after the timings that actually put pixels on the screen
** Display periods refer to pulses/timings that directly put pixels on the screen
HDP: Horizontal Display Period, normally the width - 1
HT: Horizontal Total period (display + non-display)
HPS: non-display period between the start of the horizontal sync (LLINE) signal and the first display data
LPS: horizontal sync pulse (LLINE) start location in pixel clocks
HPW: Horizontal sync Pulse Width
VDP: Vertical Display period, normally height - 1
VT: Vertical Total period (display + non-display)
VPS: non-display period in lines between the start of the frame and the first display data in number of lines
FPS: vertical sync pulse (LFRAME) start location in lines.
VPW: Vertical sync Pulse Width

*** Here's how to convert them:
HPS = SCREEN_HSYNC_PULSE + SCREEN_HSYNC_BACK_PORCH
HT - HPS = GDISP_SCREEN_WIDTH + SCREEN_HSYNC_FRONT_PORCH
=>    SCREEN_HSYNC_FRONT_PORCH = ( HT - HPS ) - GDISP_SCREEN_WIDTH
   SCREEN_HSYNC_PULSE = HPW
   SCREEN_HSYNC_BACK_PORCH = HPS - HPW
   SCREEN_HSYNC_PERIOD = HT
   
VPS = SCREEN_VSYNC_PULSE + SCREEN_VSYNC_BACK_PORCH
VT - VPS = GDISP_SCREEN_HEIGHT + SCREEN_VSYNC_FRONT_PORCH
=>   SCREEN_VSYNC_FRONT_PORCH = ( VT - VPS ) - GDISP_SCREEN_HEIGHT
   SCREEN_VSYNC_PULSE = VPW
   SCREEN_VSYNC_BACK_PORCH = VPS - LPS
   SCREEN_VSYNC_PERIOD = VT
*/

#define SCREEN_FPS 60ULL


#define GDISP_SCREEN_WIDTH 800
#define GDISP_SCREEN_HEIGHT 480

#define SCREEN_HSYNC_BACK_PORCH     46
#define SCREEN_HSYNC_FRONT_PORCH    210
#define SCREEN_HSYNC_PULSE          8

#define SCREEN_VSYNC_BACK_PORCH     23
#define SCREEN_VSYNC_FRONT_PORCH    22
#define SCREEN_VSYNC_PULSE          8


#define   SCREEN_HSYNC_PERIOD   (SCREEN_HSYNC_PULSE + SCREEN_HSYNC_BACK_PORCH + GDISP_SCREEN_WIDTH  + SCREEN_HSYNC_FRONT_PORCH)
#define   SCREEN_VSYNC_PERIOD   (SCREEN_VSYNC_PULSE + SCREEN_VSYNC_BACK_PORCH + GDISP_SCREEN_HEIGHT + SCREEN_VSYNC_FRONT_PORCH)

#define SCREEN_PCLK   (SCREEN_HSYNC_PERIOD * SCREEN_VSYNC_PERIOD * SCREEN_FPS)
#define GDISP_FPR      ((SCREEN_PCLK * 1048576)/100000000)

#endif
/** @} */


Some photos:

1. Image demo
Image

2. Text demo
Image

3. Basics
Image


LCD datasheet is available here: http://propix.com.pl/pl/p/file/ec1058c5e231fb407206c229e6a7839e/AT070TN92_PV02.pdf. Please help me with it.

PS. Sorry for my bad English.

TechNet
Posts: 2
Joined: Sat Jul 20, 2013 8:44 pm

Re: Problem SSD1963 and STM32F4 Discovery

Postby TechNet » Sun Jul 21, 2013 8:45 pm

Ok, I have fixed inverted colors by changing RGB to BGR (ehh, so simple ;) ). But I still have pixels in random places or I haven't in other. Any suggestions?

User avatar
Tectu
Posts: 1226
Joined: Thu May 10, 2012 9:50 am
Location: Switzerland
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Re: Problem SSD1963 and STM32F4 Discovery

Postby Tectu » Mon Jul 22, 2013 12:06 am

Hello TechNet,

I am sorry for the late reply but I was very busy. As you can read here, this forum cannot be used to give public support anymore. I search you to recreate your thread on our own forum. I'm sorry for this trouble but at least you'll be the first user posting to the new forum ;-)


~ Tectu


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