MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Dokumentacja Pobierz pdf (Strona 78)

Modifying the Configuration File

5-8

7) Since the dataIO function is no longer run within main, what causes this

CLK object to run its function? To find out, right-click on the CLK - Clock

Manager object. From the pop-up menu, select Properties. You see the

Clock Manager Properties dialog.

Notice that the CPU Interrupt for the Clock Manager is HWI_INT14. This

property is gray because it is actually set by the HWI_INT14 object.

8) Click Cancel to close the Clock Manager Properties dialog without

making any changes.

9) Expand the list of HWI objects and examine the properties of the

HWI_INT14 object. Its interrupt source is Timer 0 on the DSP and it runs

a function called CLK_F_isr when the on-chip timer causes an interrupt.

The CLK object functions run from the context of the CLK_F_isr hardware

interrupt function. Therefore, they run to completion without yielding and

have higher priority than any software interrupts. (The CLK_F_isr saves

the register context, so the CLK functions do not need to save and restore

context as would be required normally within a hardware ISR function.)

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MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Dokumentacja Strona 78