MATLAB XPC TARGET 4 - DEVICE DRIVERS Especificações descarregar pdf (Página 131)

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101

Constructing and Extracting CAN Data Frames

4-41

We assume that a node on the CAN network needs to receive a CAN message

with identifier 156 having the following data frame content. The data frame

has to be 6 bytes long.

The bit pattern cell array, which bit-packs the data frame according to the

above specification, can look as follows.

{ [0:7] , [15:-1:8] , [16:23] , [25] , [-1,-1,26:31] , [32:47] }

And the Simulink model simulating the needed behavior would be as show

below.

Byte 0 Function class of type uint8

Byte 1 Function subclass of type uint8 with reversed

bit order

Byte 2 Reserved, all bits have to be 1

Byte 3 Bit 0 has to be 0, Bit 1 has to be a

boolean (flag), bits 2 to 7 have to be

bit 2 to 7 of an incoming int8 value

(control)

Byte 4 and 5 Value of type int16

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 652 653

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MATLAB XPC TARGET 4 - DEVICE DRIVERS Especificações Página 131

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