ST STM32L4+ Series Reference Manual page 958

DSI Host (DSIHOST) applied to STM32L4R9xx and STM32L4S9xx only
30.11 Functional description: video mode pattern generator
The Video mode pattern generator allows the transmission of horizontal/vertical color bar
and D-PHY BER testing pattern without any stimuli.
The frame requirements must be defined in video registers that are listed in
Register Name
DSI Host Video mode Configuration Register
DSI Host Video Packet Configuration Register
DSI Host Video Chunks Configuration Register
DSI Host Video Null Packet Configuration Register
DSI Host Video HSA Configuration Register
DSI Host Video HBP Configuration Register
DSI Host Video Line Configuration Register
DSI Host Video VSA Configuration Register
DSI Host Video VBP Configuration Register
DSI Host Video VFP Configuration Register
DSI Host Video VA Configuration Register
30.11.1 Color bar pattern
The color bar pattern comprises eight bars for white, yellow, cyan, green, magenta, red,
blue, and black colors.
Each color width is calculated by dividing the line pixel size (vertical pattern) or the number
of lines (horizontal pattern) by eight. In the vertical color bar mode
color bar has a width of the number of pixels in a line divided by eight. In case the number of
pixels in a line is not divisible by eight, the last color (black) contains the remaining.
In the horizontal color bar mode
number of lines in a frame divided by eight. In case the number of lines in a frame is not
divisible by eight, the last color (black) contains the remaining lines.
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Table 203. Frame requirement configuration registers
(Figure
RM0432 Rev 6
Description
Video mode configuration
Video packet size
Number of chunks
Null packet size
Horizontal sync active time
Horizontal back porch time
Line time
Vertical sync active period
Vertical back porch period
Vertical front porch period
Vertical resolution
232), each color line has a color width of the
RM0432
Table 203.
(Figure 231), each single