Digilent PmodCLP Довідковий посібник - Сторінка 3

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PmodCLP Library: CLP Demo

Resources Used

Timer5 configuration is done using Plib macros in AppInit function. SFRs approach is also provided in

the commented code.

Plib macro used:

OpenTimer5(T5_ON | T5_SOURCE_INT | T5_PS_1_8, 99);

ConfigIntTimer5(T5_INT_ON | T5_INT_PRIOR_7 | T5_INT_SUB_PRIOR_3);

Meaning:

T5_ON – timer 5 is ON.

T5_PS_1_8 (Prescaler 1/8): so the frequency is 1/8 of Peripheral bus freq, which is 1/8 of

SYSCLK (65 MHz) = 1 MHz

Period = 99, so Timer period = (99 + 1) * 1/1MHz = 100 us

T5_SOURCE_INT : Timer5 triggers interrupt

T5_INT_ON – T5 interrupt is ON

T5_INT_PRIOR_7, T5_INT_SUB_PRIOR_3 - timer interrupt priority level 7, subpriority level

More information about Timer5 is shown in Timer5Handler.

Functions defined in main.c

void __ISR(_TIMER_5_VECTOR, ipl7) Timer5Handler(void)

Parameters:

None

Interrupt service routine for Timer 5interrupt. Timer 5 is used to perform software debouncing

of the on-board buttons.

int main(void)

Parameters:

none

Main program module. Performs basic board initialization (by calling DeviceInit and AppInit)

and then enters the main program loop, where steps are cycled. For every step,

WaitUntilBtnPressed is called in order to wait for the buttons.

void WaitUntilBtnPressed(BOOL *pfBtn1Process, BOOL *pfBtn2Process)

Parameters:

pfBtn1Process

pfBtn2Process

www.digilentinc.com

Digilent file, also used in other applications.

It was not modified for this application.

used as output parameter fTrue if the button 1 causes

processing fFalse if the button 1 does not cause processing.

used as output parameter fTrue if the button 2 causes

processing fFalse if the button 2 does not cause processing.

Digilent, Inc.

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