Table 89. Pixel Data Mapping Versus Color Format - STMicroelectronics STM32F405 Reference Manual

LCD-TFT Controller (LTDC)
Pixel input Format
The programmable pixel format is used for the data stored in the frame buffer of a layer.
Up to 8 input pixel formats can be configured for every layer through the LTDC_LxPFCR
register
The pixel data is read from the frame buffer and then transformed to the internal 8888
(ARGB) format as follows:
•
Components which have a width of less than 8 bits get expanded to 8 bits by bit
replication. The selected bit range is concatenated multiple times until it is longer than
8 bits. Of the resulting vector, the 8 MSB bits are chosen. Example: 5 bits of an
RGB565 red channel become (bit positions): 43210432 (the 3 LSBs are filled with the 3
MSBs of the 5 bits)
The figure below describes the pixel data mapping depending on the selected format.
A
B
G
R [4:0] G
x+1
R [4:0] G
x+3
A
x+1
G
A
x+3
G
A [3:0]R
x+1
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Table 89. Pixel Data mapping versus Color Format

@+3
A [7:0]
x
@+7
[7:0]
x+1
@+3
[7:0]
x+1
@+7
[7:0]
x+2
@+3
[5:3] G
x+1 x+1
@+7
[5:3] G
x+3 x+3
@+3
[0]R [4:0]
x+1
G
x+1
[4:3]
x+1
@+7
[0]R [4:0]
x+3
G
x+3
[4:3]
x+3
@+3
[3:0] G
x+1 x+1
DocID018909 Rev 11
ARGB8888
@+2
R [7:0]
x
@+6
R [7:0]
x+1
RGB888
@+2
R [7:0]
x
@+6
B [7:0]
x+2
RGB565
@+2
[2:0] B [4:0] R
x+1
@+6
[2:0] B [4:0] R
x+3 x+2
ARGB1555
@+2
[2:0] B [4:0] A [0] R
x+1 x
@+6
A [0]R
x+2
[2:0] B [4:0]
x+3
ARGB4444
@+2
[3:0] B [3:0] A
x+1
@+1
G [7:0]
x
@+5
G [7:0]
x+1
@+1
G [7:0]
x
@+5
R [7:0]
x+1
@+1
[4:0] G [5:3] G
x x
@+5
[4:0] G [5:3] G
x+2 x+2
@+1
[4:0] G [4:3] G
x x
@+5
[4:0]G [4:
x+2 x+2
G
x+2
3]
@+1
[3:0] R [3:0] G
x x
RM0090
@
B [7:0]
x
@+4
B [7:0]
x+1
@
B [7:0]
x
@+4
G [7:0]
x+1
@
[2:0] B [4:0]
x x
@+4
[2:0] B [4:0]
x+2
@
[2:0] B [4:0]
x x
@+4
[2:0] B [4:0]
x+2
@
[3:0] B [3:0]
x x