MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Guia do Utilizador descarregar pdf (Página 109)

100

101

Schedulers and Timing

Timer Period

CPU Clock Rate Base Sample Time

Low Resolu

(_ _)*(_ _)

ttion Clock Divider

Prescaler

Thesoftwareconﬁguresthetimersothatthebaseratesampletimeforthe

coded process corresponds to the interrupt rate. Embedded IDE Link CC

calculates and conﬁgures the timer period to ensure the desired sample rate.

Different proces sor families use the timer resource and interrupt number

differently. Entrie s in the following table show the resources each family uses.

Processor

Family

Timer R esource

Interrupt

Number

Simulink

Priority

C28x™

Timer 1

C55x™

Timer 1

C6000

Timer 1

C672x

Timer 1

40 for all

processors

The minimum base rate sample time you can achieve depends on two

factors—the algorithm complexity and the CPU clock speed. The maximum

value depends on the maximum timer period value and the CPU clock speed.

If all the blocks in the model inherit their sample time value, and you do not

deﬁne the sample time, Simulink assigns a default sample time of 0.2 second.

Using Asynchronous Scheduling

Embedded IDE Link CC enables you to model and automatically generate

code for asynchronous s ystems. To do so, use the following scheduling blocks:

• Hardware Interrupt blocks for bare-board code generation mode

• Idle Task

The H ard w are Interrupt block operates by

• Generating selected hardware interrupts for the processor

• Generating corres ponding ISRs for the interrupts

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