xosc_switching.c

基于cc1010的设计实例

/*****************************************************************************
 *                                                                           *
 *        **********                                                         *
 *       ************                                                        *
 *      ***        ***                                                       *
 *      ***   +++   ***                                                      *
 *      ***   + +   ***                                                      *
 *      ***   +                    CHIPCON CC1010 EXAMPLE PROGRAM            *
 *      ***   + +   ***                 XOSC/POWER SWITCHING                 *
 *      ***   +++   ***                                                      *
 *      ***       ***                                                        *
 *       ***********                                                         *
 *        *********                                                          *
 *                                                                           *
 *****************************************************************************
 * Demonstrates:                                                             *
 *   - CC1010 XOSC switching (32 kHz <-> 14 MHz).                            *
 *   - CC1010 powermode switcing (ACTIVE <-> IDLE)                           *
 *                                                                           *
 *****************************************************************************
 * Author:              TOS                                                  *
 *****************************************************************************
 *                                                                           *
 * $Log: xosc_switching.c,v $
 * Revision 1.2  2004/01/09 16:20:50  tos
 * Removed obsolete delay function.
 *
 * Revision 1.1  2003/12/11 12:52:17  tos
 * Initial version in CVS.
 *
 *
 *                                                                           *
 ****************************************************************************/

#include <chipcon/hal.h>
#include <chipcon/cc1010eb.h>


int main() {
    
    int i;

    // Disable watchdog timer
    WDT_ENABLE(FALSE);

    // Startup macros for speed and low power consumption
    MEM_NO_WAIT_STATES();
    FLASH_SET_POWER_MODE(FLASH_STANDBY_BETWEEN_READS);

    // All I/Os are inputs after reset.
    // Make I/Os connected to LEDs outputs
    RLED_OE(FALSE);
    YLED_OE(FALSE);
    GLED_OE(TRUE);
    BLED_OE(TRUE);
    RLED=YLED=GLED=BLED=LED_OFF;

    // Inactivate realtime clock
    RTC_RUN(FALSE);

    // Switch regularly between low -and high speed XOSC:
    while(1) {

        /////////////////////////////////////////////////////////////////
        ////////////////// Switch to low-speed XOSC /////////////////////
        /////////////////////////////////////////////////////////////////

        // Enable low-speed XOSC
        X32_INPUT_SOURCE(X32_USING_CRYSTAL);
        X32_ENABLE(TRUE);

        // Wait until low-speed XOSC is stable:
        // At this point CC1010 is running on high-speed XOSC, so 0.5 sec
        // is required to wait for low-speed XOSC stabilization
        halWait(250, CC1010EB_CLKFREQ);
        halWait(250, CC1010EB_CLKFREQ);

        // Switch to low-speed XOSC
        MAIN_CLOCK_SET_SOURCE(CLOCK_X32);

        // Disable / turn off high-speed oscillator
        XOSC_ENABLE(FALSE);

        BLED = LED_ON;
        GLED = LED_OFF;

        // Set all unused ports as input
        P0DIR = 0xFF;
        P1DIR |= 0xEF;
        P2DIR |= 0xDF;
        P3DIR = 0xFF;

        // Assert all unused ports
        P0 = 0xFF;
        P1 |= 0xEF;
        P2 |= 0xDF;
        P3 = 0xFF;

        // Power down RF-transceiver
        RFMAIN=0xF8;

        // Configure realtime clock to support wake-up from IDLE
        halConfigRealTimeClock(4);

        // Enable realtime clock (implicit: interrupt enable)
        RTC_RUN(TRUE);

        // Enter IDLE mode
        ENTER_IDLE_MODE();

        // Comment:
        // CC1010 will now be woken up by the RTC interrupt.

        /////////////////////////////////////////////////////////////////
        /////////////////////////////////////////////////////////////////




        /////////////////////////////////////////////////////////////////
        ////////////////// Switch to high-speed XOSC ////////////////////
        /////////////////////////////////////////////////////////////////

        // Enable high-speed XOSC
        XOSC_ENABLE(TRUE);

        // Wait until high-speed XOSC is stable:
        // At this point CC1010 is running on low-speed XOSC, so only 1 loop
        // iteration is required to wait for high-speed XOSC stabilization
        // Comment:
        // Do not use halWait(...) because it is not intended for low-speed XOSC.
        for(i = 1; i > 0; i--);

        // Switch to low-speed XOSC
        MAIN_CLOCK_SET_SOURCE(CLOCK_XOSC);

        // Disable / turn off low-speed oscillator
        X32_ENABLE(FALSE);

        // Do something intelligent...
        GLED = LED_ON;
        halWait(200, CC1010EB_CLKFREQ);

        /////////////////////////////////////////////////////////////////
        /////////////////////////////////////////////////////////////////

    }
}



// ISR (interrupt service routine) for RTC, priority 11
// The interrupt must be cleared by software
void isr_rtc() interrupt INUM_RTC {
    RTC_RUN(FALSE);
    INT_SETFLAG(INUM_RTC, INT_CLR);
    BLED = LED_OFF;
}