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Appendix

Lab 05 Worksheet (1)

General Interrupt Questions

1. When your program is not in an interrupt service routine, what code is it

usually executing? And, what ‘name’ do we give this code?

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2. Why keep ISR’s short (i.e. not do a lot of processing in them)?

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3. What causes the MSP430 to exit a Low Power Mode (LPMx)?

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4. Why are interrupts generally preferred over polling?

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main functions while{} loop. We often call this ‘background’ processing.

We don’t want to block other interrupts. The other option is nesting

interrupts, but this is INEFFICIENT. Do interrupt follow-up processing in

while{} loop … or use TI-RTOS kernel.

Interrupts

They are a lot more efficient. Polling ties up the CPU – even worse it

consumes power waiting for an event to happen.

Lab 05 Worksheet (2)

Interrupt Flow

5. Name 3 more sources of interrupts?

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6. What signifies that an interrupt has occurred?

A __________ bit is set

What’s the acronym for these types of ‘bits” ___________

7. Write the code to enable a GPIO interrupt on Port 1, pin1 (aka P1.1)?

___________________________________ // setup pin as input

___________________________________ // clear individual INT

___________________________________ // enable individual INT

Timer_A

GPIO

Watchdog Interval Timer

Analog Converter … and many more

flag

IFG

GPIO_setAsInputPinWithPullUpresistor(GPIO_PORT_1, GPIO_PIN1);

GPIO_clearInterruptFlag(GPIO_PORT_P1, GPIO_PIN1);

GPIO_enableInterrupt(GPIO_PORT_P1, GPIO_PIN1);

5 - 54 MSP430 Workshop - Interrupts

Texas Instruments MSP430 Student Guide

Other manuals for Texas Instruments MSP430