AR# 36375: 12.1 EDK, XPS_TFT - How can I store a 176x144 image stored in memory as 640x480?
AR# 36375
12.1 EDK, XPS_TFT - How can I store a 176x144 image stored in memory as 640x480?
描述
The RGB fileIam storing in RAMhas a resolution of176x144 pixels, but the XPS_TFT supports 640x480. How do I store the image?
解决方案
In video memory, all 640x480 pixels must be stored. Each line start address will be 4 x (1024 x i); where integer i varies from 0 to 143.Each pixel is represented as 32-bit word in the memory. So, the 176x144 frame should be written as given below. Suppose the memory address starts from 0xa000_0000: 1st line of the frame should be stored at 0xa000_0000 to 0xa000_02BC (0 to 175) 2nd line of the frame should be stored at 0xa000_1000 to 0xa000_12BC (4x1024=4096d=1000Hex) : : : 144th line of the frame should be stored at 0xa008_F000 to 0xa008_F2BC (143x1024x4=8F000 Hex)
The application can fill the memory as per details given below.