raster例程的问题？

用的是C6748，starteware中例程raster，按照下面的步骤修改了，有光栅，无图像，查看缓存里面图像数据也有，请问应该怎么判断问题所在？以上是调试中的现象，谢谢了！

?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.

Tony Tang：

光栅也是图像啊，你想要看什么图像？缓存里是什么图像数据？