MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Guide de l'utilisateur télécharger pdf (Page 110)

100

101

3 Project Generator

• C onnecting the ISRs to the corresponding interrupt service vector table

entries

Note You are responsible for m apping and enabling the interrupts you

specify in the block dialog box.

Connect the output of the Hardware Interrupt block to the control input

of a function-call subsystem. By doing so, you enable the ISRs to call the

generated subsystem code each time the hardw are raises the interrupt.

TheIdleTaskblockspeciﬁes one or more functions to execute as background

tasks in the code generated for the model. The functions are created from the

function-call subsystems to which the Idle Task block is connected.

Mapping and Enabling Interrupts in Generated Code

Although the scheduling blocks generate ISRs to respond to interrupts, they

donotenabletheinterruptsinyourcode. Theblocksalsodonotmapthe

interrupts to the speciﬁc ISRs y ou specify in the block dialog bo xes.

To enable and map the interrupt routines, you provide code that performs the

mapping and enabling functions. ISR mapping and enabling code might look

like following samples w hich enable and map interrupts 5 and 7:

IRQ_map(IRQ_EVT_EXTINT5,5); % Map interrupt 5 in the block to ext. int.5.

IRQ_set(IRQ_EVT_EXTINT5); % Enable interrupt 5.

IRQ_map(IRQ_EVT_EXTINT7,7); % Map interrupt 7 in the block to ext. int.7.

IRQ_set(IRQ_EVT_EXTINT7); % Enable interrupt 7.

The following ﬁgure shows the block dialog b ox that speciﬁes the interrupts

3-20

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 574 575

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MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Guide de l'utilisateur Page 110

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