MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Podręcznik Użytkownika Pobierz pdf (Strona 83)

F2812 eZdsp

3-41

SAM — Number of samples used by the CAN module to determine the

CAN bus level. Selecting

Sample_one_time samples once at the sampling

point. Selecting

Sample_three_times samples once at the sampling point

and twice before at a distance of TQ/2. A majority decision is made from

the three points.

SBG — Sets the message resynchronization triggering. Options are

Only_falling_edges and Both_falling_and_rising_edges.

SJW — Sets the synchronization jump width, which determines how many

units of TQ a bit is allowed to be shortened or lengthened when

resynchronizing.

SelfTestMode — If True, sets the eCAN module to loopback mode, where

a “dummy” acknowledge message is sent back without needing an

acknowledge bit. The default is

False.

TSEG1 — Sets the value of time segment 1, which, with TSEG2 and BRP,

determines the length of a bit on the eCAN bus. TSEG1 must be greater

than TSEG2 and the Information Processing Time (IPT). The IPT is the

time needed to process one bit and corresponds to two TQ units.

TSEG1 = PROP_SEG + PHASE_SEG1. Valid values for TSEG1 are from

1 through 16.

TSEG2 — Sets the value of time segment 2 (PHASE_SEG2), which, with

TSEG1 and BRP, determines the length of a bit on the eCAN bus. TSEG2

must be less than or equal to TSEG1 and greater than or equal to IPT.

Valid values for TSEG2 are from 1 through 8.

The eCAN bit timing is shown in the following illustration.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 111 112

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MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Podręcznik Użytkownika Strona 83