ST STM32L4+ Series Reference Manual page 960

DSI Host (DSIHOST) applied to STM32L4R9xx and STM32L4S9xx only
White
R High
G High
B High
30.11.3 BER testing pattern
The BER testing pattern simplifies conformance testing. This pattern tests the RX D-PHY
capability to receive the data correctly. The following data patterns are required:
•
X bytes of 0xAA (high-frequency pattern, inverted);
•
X bytes of 0x33 (mid-frequency pattern);
•
X bytes of 0xF0 (low-frequency pattern, inverted);
•
X bytes of 0x7F (lone 0 pattern);
•
X bytes of 0x55 (high-frequency pattern);
•
X bytes of 0xCC (mid-frequency pattern, inverted);
•
X bytes of 0x0F (low-frequency pattern);
•
Y bytes of 0x80 (lone 1 pattern).
In most cases, Y is equal to X. However, depending on line length and the color coding
used, Y may be different from X. With RGB888 color coding and horizontal resolution in
multiples of eight, the pattern shown in
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Table 204. RGB components
Yellow Cyan
High Low
High High
Low High
Figure 233
Figure 233. RGB888 BER testing pattern
RM0432 Rev 6
Green Magenta
Low High
High Low
Low High
appears on the DSI display.
RM0432
Red Blue Black
High Low
Low Low
Low High
Low
Low
Low