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Fleck

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Posts posted by Fleck

  3. STM32F749G-Discovery color reproduction

    in Support

    Posted

    OK, found it, problem is in the board file: boards/base/STM32F746-Discovery/board_STM32LTDC.h
    1) Line 139 for PK0 MODER used is GPIO_MODER_MODER0_0 but should be GPIO_MODER_MODER0_1
    2) Line 184 for PG12 AFRH is set to 14 (LCD_B1), but needs to be 9 (LCD_B4), LCD_B1 we have on PJ13!

    Now there is only one thing left, HardFault when enabling RGB888 mode in drivers config file, I overcome this by setting LTDC_PIXELFORMAT to LTDC_FMT_ARGB8888, LTDC_PIXELBYTES to 4 and LTDC_PIXELBITS to 32, also, in DMA2D init if RGB888 is selected, I set DMA2D to ARGB8888. Yes I know, this is not the right way, but, at least, it doesn't HardFault, HardFault error was unaligned memory access, 24 bits on 32bit cpu?!? Dunno why, I am not so smart in all this, and last line in gdisp_lld_STM32LTDC.c executed before HardFault is 277: PIXEL_ADDR(g, pos)[0] = gdispColor2Native(g->p.color);

    Anyways, now I can continue do what I wanted to do on F7-Disco :D heh and you have all the info needed to fix all those problems, case closed!

  4. STM32F749G-Discovery color reproduction

    in Support

    Posted · Edited by Fleck

    OK, I have tried STM32CubeF7 demo/example code, there is a picture frame demo code, I uploaded my BMP to sdcard and checked it out, it's definitely not a property of a display, looks great! Next, I will try to find where the problem lies! Here's the image running STM32CubeF7 demo/example code: http://imgur.com/1e3PwtV as you can see, nice and smooth! :) Will let you know if I find something more on this problem!

  8. STM32F749G-Discovery color reproduction

    in Support

    Posted

    Hi, as Tectu is busy those days, I decided to post my question here. No matter what pixel format I use (RGB565 or  RGB888) I get low quality image on screen, I use 24bit bmp, here's image of F7 on the left and F4 with SSD1289 on the right, you can see the quality difference: http://imgur.com/rR5K1i2 and bigger image of F7: http://imgur.com/VPzZ5GD, as you can see, colors are not smooth, like 256 color mode on old PCs :D Ideas?

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