DLPU115 User guide | 德州仪器 TI.com.cn

DLPU115 January 2022 DLPC3421

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3.1.24.3 Return Parameters

Table 3-22 describes the return parameters.

Table 3-22 Return Parameters

Parameter Bytes	Description
Byte 1	Red duty cycle (LSByte) (Look structure)
Byte 2	Red duty cycle (MSByte) (Look structure)
Byte 3	Green duty cycle (LSByte)(Look structure)
Byte 4	Green duty cycle (MSByte) (Look structure)
Byte 5	Blue duty cycle (LSByte) (Look structure)
Byte 6	Blue duty cycle (MSByte) (Look structure)
Byte 7	Maximum frame count (LSByte) (Look structure)
Byte 8	Maximum frame count (Look structure)
Byte 9	Maximum frame count (Look structure)
Byte 10	Maximum frame count (MSByte) (Look structure)
Byte 11	Minimum frame count (LSByte) (Look structure)
Byte 12	Minimum frame count (Look structure)
Byte 13	Minimum frame count (Look structure)
Byte 14	Minimum frame count (MSByte) (Look structure)
Byte 15	Max number of sequence vectors (Look structure)
Byte 16	Red duty cycle (LSByte) (Sequence structure)
Byte 17	Red duty cycle (MSByte) (Sequence structure)
Byte 18	Green duty cycle (LSByte) (Sequence structure)
Byte 19	Green duty cycle (MSByte) (Sequence structure)
Byte 20	Blue duty cycle (LSByte) (Sequence structure)
Byte 21	Blue duty cycle (MSByte) (Sequence structure)
Byte 22	Maximum frame count (LSByte) (Sequence structure)
Byte 23	Maximum frame count (Sequence structure)
Byte 24	Maximum frame count (Sequence structure)
Byte 25	Maximum frame count (MSByte) (Sequence structure)
Byte 26	Minimum frame count (LSByte) (Sequence structure)
Byte 27	Minimum frame count (Sequence structure)
Byte 28	Minimum frame count (Sequence structure)
Byte 29	Minimum frame count (MSByte) (Sequence structure)
Byte 30	Max number of sequence vectors (Sequence structure)

The sequence header data is stored in two separate flash data structures (the Look structure and the sequence structure), and the values from each must match.

The bit weight and bit order for the duty cycle data is shown in Figure 3-32.

Figure 3-32 Bit Weight and Bit Order for Duty Cycle Data

MSB	Byte 2	LSB	MSB	Byte 1	LSB
b15 2⁷	b14 2⁶	b13 2⁵	b12 2⁴	b11 2³	b10 2²	b9 2¹	b8 2⁰	b7 2^–1	b6 2^–2	b5 2^–3	b4 2^–4	b3 2^–5	b2 2^–6	b1 2^–7	b0 2^–8

MSB

Byte 2

LSB

MSB

Byte 1

LSB

b15

2⁷

b14

2⁶

b13

2⁵

b12

2⁴

b11

2³

b10

2²

2¹

2⁰

2^–1

2^–2

2^–3

2^–4

2^–5

2^–6

2^–7

2^–8

The duty cycle data is specified as each color percent of the frame time. The sum of the three duty cycles must add up to 100. An example possibility is, R = 30.5 = 1E80h, G = 50 = 3200h, and B = 19.5 = 1380h)

The sequence maximum and minimum frame counts are specified in units of 66.67 ns (based on the internal 15 MHz clock used to time between input frame syncs). These are specified in this way to enable fast and simple compares to the frame count by the software.

The maximum number of sequence vectors byte is defined in Figure 3-33.

Figure 3-33 Maximum Number of Sequence Vectors

MSB	Byte 15 and 30						LSB
b7	b6	b5	b4	b3	b2	b1	b0

b(7:4)	Reserved
b(3:0)	Maximum number of sequence vectors