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LCDDMA显示问题

Chengyi Yu
Intellectual 260 points


C6748的片子，用LCDDMA的raster做显示，不优化结果是ok的。一旦o-3优化之后，lcd显示就会频繁跳动，屏幕狂闪，求解决方案。现在由于效率问题必须用优化。之前我尝试过打开DDR的cachemar和L2的cache，在debug下显示正常，但是一旦load到nor flash就显示不正常，虽然不狂闪，但是显示是偏移的。

  • 0
    TI__Guru 64206 points

    按照下面几点的调整，应该可以解决你的问题：

    •In order to ensure LCDC bandwidth to prevent flicker issue, adjust system and LCDC configuration as below:
    –1. set system configure register MSTPRIx to ensure LCDC is highest priority on SCR, other master lower than LCDC, 0 is highest priority.
    –2. set DDR BPPBR register to 0x20 or less.
    –3. set LCDDMA_CTRL[TH_FIFO_READY] = 5h or 4h, and 

                    LCDDMA_CTRL[BURST_SIZE] = 4  

    –4. set RASTER_CTRL[PLM]= 2(data only) after LCD load palette.