ledbutton.c

ADI公司blackfin DSP开发板BF533 EZ-KIT LITE附带的全部原代码

/*********************************************************************************

Copyright(c) 2005 Analog Devices, Inc. All Rights Reserved.

This software is proprietary and confidential.  By using this software you agree
to the terms of the associated Analog Devices License Agreement.

$RCSfile: LEDButton.c,v $
$Revision: 1.1 $
$Date: 2007/03/28 17:55:35 $

Description:
            This is a little demo to show how to use the EZ-Kit utilities for the
            LEDs and push buttons.

            On the ADSP-BF533 EZ-Kit, the push buttons on the EZ-Kit must be
            enabled by having switches 1 through 4 turned on on the SW9 DIP switch
            on the board.

            On the ADSP-BF537 EZ-Kit, the push buttons on the EZ-Kit must be
            enabled by having switches 1 through 4 turned on on the SW5 DIP switch
            on the board.

            On the ADSP-BF561 EZ-Kit, the push buttons on the EZ-Kit must be
            enabled by having switches 1 through 4 turned on on the SW4 DIP switch
            on the board.

*********************************************************************************/


/*********************************************************************

Include files

*********************************************************************/

#include "services\services.h"       // system services
#include "ezkitutilities.h"         // ezkit utilities

/*********************************************************************

Globals

*********************************************************************/

u32 Debounce_Time = 500; //value in ms

/*********************************************************************

Static data

The LEDs and pushbuttons interface with the processor via the programmable
flags.  The EZ-Kit utilities utilize the flag service to control the
LEDs and pushbuttons.  Because the demo uses interrupts for the
pushbuttons, we need to give the flag service memory to control the
interrupts, and the interrupt manager memory for secondary handlers.  Note
that if the flags were using separate IVG levels, we wouldn't need to
provide the interrupt service with memory.  But because all the flag
interrupts are ganged up on a single IVG, we need to supply memory for
the secondary handlers (note that one handler is installed as the primary
and the rest are secondary so we need 1 less secondary handler).

*********************************************************************/

// flag service
static u8 FlagServiceData[ADI_FLAG_CALLBACK_MEMORY * (EZ_LAST_BUTTON - EZ_FIRST_BUTTON + 1)];

// interrupt service
static u8 IntMgrData[ADI_INT_SECONDARY_MEMORY * (EZ_LAST_BUTTON - EZ_FIRST_BUTTON)];


/*********************************************************************

Peripheral ID Macros

This program works on the EZ-Kits.  The macros
below are used to identify which EZ-Kit we're targeting.  Specifically, 
the FLAG_PERIPHERAL_ID macro is set to the peripheral ID to which the 
interrupt driven push buttons are mapped.  See the adi_int.h file
within the system services library (blackfin/include/services) for
more information on peripheral IDs.  

*********************************************************************/

#if defined(__ADSP_EDINBURGH__)
#define FLAG_PERIPHERAL_ID	(ADI_INT_PFA)
#endif

#if defined(__ADSP_BRAEMAR__)
#define FLAG_PERIPHERAL_ID	(ADI_INT_PORTFG_A)
#endif

#if defined(__ADSP_TETON__)
#define FLAG_PERIPHERAL_ID	(ADI_INT_PF0_15_A)
#endif

/*********************************************************************

    Function:       ButtonCallback

    Description:    This function is a callback used to process the
                    push buttons on the EZ-Kit when they are generating
                    interrupts.

                    See the appropriate section in main() for how to set
                    up interrupt driven push buttons.

                    This function lights the LED corresponding to the button
                    that was pushed.


*********************************************************************/

static void ButtonCallback(   // call back function specific for UART0
    void *ClientHandle,
    u32  Event,
    void *pArg)
{

    u32 Button; // button that was pushed

    // get the button that was pushed
    Button = (u32)ClientHandle;

    // light only the LED corresponding to the button that was pressed
    ezTurnOffAllLEDs();
    ezTurnOnLED((Button - EZ_FIRST_BUTTON) + EZ_FIRST_LED);

    // return
}

/*********************************************************************

    Function:       PolledPushButtons

    Description:    This function illustrates how to use the push buttons
            on the EZ-Kit by polling them.

            To use polling, all one has to do is initialize the
            buttons which really just configures the Programmable
            Flag registers of the processor.

            This demo simply turns on the LED corresponding to the
            button that was pressed.  When the last button is
            pressed, the demo moves on to the next part.

*********************************************************************/

void PolledPushButtons(void) {


    // counter
    volatile u32 i;

    // turn off all LEDs
    ezTurnOffAllLEDs();

    // LOOP
    while (1) {

        // FOR (all buttons except the last one)
        for (i = EZ_FIRST_BUTTON; i < EZ_LAST_BUTTON; i++) {

            // IF (the button is pushed)
            if (ezIsButtonPushed(i)) {

                // clear the latch for the button
                ezClearButton(i);

                // turn off all LEDs except the one corresponding to the button that was pushed
                ezTurnOffAllLEDs();
                ezTurnOnLED((i - EZ_FIRST_BUTTON) + EZ_FIRST_LED);

            // ENDIF
            }

        // ENDFOR
        }

        // IF (the last button is pushed)
        if (ezIsButtonPushed(EZ_LAST_BUTTON)) {

            // clear the latch for the last button and move on to the next part of the demo
            ezClearButton(EZ_LAST_BUTTON);
            break;

        // ENDIF
        }

    // ENDLOOP
    }

    // turn off all LEDs
    ezTurnOffAllLEDs();

    ezDelay(Debounce_Time);

    // return
}





/*********************************************************************

    Function:   InterruptDrivenPushButtons

    Description:    This function illustrates how to use the push buttons
            on the EZ-Kit by using interrupts.

            To use interrupt driven push buttons, the following
            steps need performed:
                o initialize the Interrupt Manager since we'll
                    be using interrupts
                o initialize the push buttons (if not already initialized)
                o hook an interrupt handler onto the IVG that the
                    programmable flags are configured to
                o configure the SIC to pass the flag interrupts
                    to the CEC
                o use the EZ-Kit utility to enable the push button
                    interrupts

            The operation of this demo is identical to the polled
            demo except we're using interrupts this time.

*********************************************************************/

void InterruptDrivenPushButtons(void) {


    u32 IVG;

    // counter
    volatile u32 i;


    // turn off all LEDs
    ezTurnOffAllLEDs();

    // install callbacks for each button
    for (i = EZ_FIRST_BUTTON; i <= EZ_LAST_BUTTON; i++) {
        ezClearButton(i);
        adi_flag_InstallCallback(ezButtonToFlag[i], FLAG_PERIPHERAL_ID, ADI_FLAG_TRIGGER_RISING_EDGE, TRUE, (void*)i, NULL, ButtonCallback);
    }

    // LOOP
    while (1) {

        // all the processing is done in the callback function
        // when the last is pushed we'll move on to the next part
        // of the demo

        // rather than do anything fancy to detect the last button, we'll just
        // peek and see if the LED corresponding to the last button is lit
        if (ezIsLEDOn(EZ_LAST_BUTTON - EZ_FIRST_BUTTON + EZ_FIRST_LED)) {
            break;
        }

    // ENDLOOP
    }

    // remove callbacks for each push button
    for (i = EZ_FIRST_BUTTON; i <= EZ_LAST_BUTTON; i++) {
        adi_flag_RemoveCallback(ezButtonToFlag[i]);
        
    }

    // turn off all LEDs
    ezTurnOffAllLEDs();

    ezDelay(Debounce_Time);

    // return
}




/*********************************************************************

    Function:       LEDs

    Description:    This function illustrates how to use the LED functions
                    in the EZ-Kit utilities.

                    This demo shows how to turn LED's on, off and cycle
                    through them. It also uses polled push buttons.

                    The demo first turns off all LED's.  Then each time
                    the first button is pressed, the LED corresponding to the
                    first button is toggled.  When the second button is
                    pressed, all LED's are cycled until either the first
                    button is pressed again or until the last button is
                    pressed, at which point we move on to the next part
                    of the demo.

*********************************************************************/

void LEDs(void) {

    // counter
    volatile u32 i;

    // turn off all LEDs
    ezTurnOffAllLEDs();

    // LOOP
    while (1) {

        // close this demo when the last push button is pressed
        if (ezIsButtonPushed(EZ_LAST_BUTTON)) {
            ezClearButton(EZ_LAST_BUTTON);      // clear the last button's latch
            break;
        }

        // IF (first button is pressed)
        if (ezIsButtonPushed(EZ_FIRST_BUTTON)) {

            // clear the first button's latch
            ezClearButton(EZ_FIRST_BUTTON);

            // toggle the first LED
            ezToggleLED(EZ_FIRST_LED);

        // ENDIF
        }

        // IF (the second button is pressed)
        if (ezIsButtonPushed(EZ_FIRST_BUTTON + 1)) {

            // clear the second button's latch
            ezClearButton(EZ_FIRST_BUTTON + 1);

            // turn off all LEDs
            ezTurnOffAllLEDs();

            // LOOP
            while (1) {

                // cycle LEDs till some other button is pressed
                ezCycleLEDs();

                // delay so we can see the LED's cycle
                for (i = 0; i < 3000000; i++) ;

                // keep looping till the first or last button pressed
                if (ezIsButtonPushed(EZ_FIRST_BUTTON) || ezIsButtonPushed(EZ_LAST_BUTTON)) break;

            // ENDLOOP
            }

        // ENDIF
        }

    // ENDLOOP
    }

    // turn off all LEDs
    ezTurnOffAllLEDs();

    ezDelay(Debounce_Time);

    // return
}




/*********************************************************************

    Function:       main

    Description:    This function is main function of the demo.  It
                    doesn't do anything other than initialize flash
                    on the EZ-Kit and then call the demo subroutines.

                    In the unlikely event we get an error somewhere,
                    this demo uses the ezErrorCheck function to light
                    all the LEDs and spin in a loop.

*********************************************************************/

void main(void) {

    u32 ResponseCount;  // number of things a service can control
    
    u32 i; //loop variable

    // initialize the EZ-Kit
    ezInit(1);

    // initialize the Interrupt Manager
    ezErrorCheck(adi_int_Init(IntMgrData, sizeof(IntMgrData), &ResponseCount, NULL));

    // initialize the flag manager because the LEDs and buttons connect via flags
    ezErrorCheck(adi_flag_Init(FlagServiceData, sizeof(FlagServiceData), &ResponseCount, NULL));

    // initialize Buttons being used
    for (i = EZ_FIRST_BUTTON; i < EZ_NUM_BUTTONS; i++){
        ezInitButton(i);
    }
    // initialize LEDS being used
    for (i = EZ_FIRST_LED; i < EZ_NUM_LEDS; i++){
        ezInitLED(i);
    }
    
    // show how to use polled push buttons
    PolledPushButtons();

    // show how to use interrupt-driven push buttons
    InterruptDrivenPushButtons();

    // show how to use the LEDs
    LEDs();

    // terminate the flag service
    adi_flag_Terminate();

    // terminate the Interrupt Manager
    adi_int_Terminate();

    // that's all folks!
}