pwm.c

基于cc1010的设计实例

/*****************************************************************************
 *                                                                           *
 *        **********                                                         *
 *       ************                                                        *
 *      ***        ***                                                       *
 *      ***   +++   ***                                                      *
 *      ***   + +   ***                                                      *
 *      ***   +                    CHIPCON CC1010 EXAMPLE PROGRAM            *
 *      ***   + +   ***                         PWM                          *
 *      ***   +++   ***                                                      *
 *      ***       ***                                                        *
 *       ***********                                                         *
 *        *********                                                          *
 *                                                                           *
 *****************************************************************************
 * Demonstrates use of the timer module as a PWM source. Uses:               *
 * - PWM2_SET_PERIOD, PWM2_SET_DUTY_CYCLE macros                             *
 * - various other HAL functions and macros                                  *
 *                                                                           *
 * The program configures timer 2 as a PWM timer. The pulse width can be     *
 * changed by turning the pot on the evaluation board. Connect P3.4 to an    *
 * oscilloscope or light source to observe the generated waveform.           *
 *****************************************************************************
 * Author:              TEL/ARR                                              *
 *****************************************************************************
 * Revision history:                                                         *
 * 1.0  2002/04/26      First Public Release                                 *
 * 1.1  2002/08/29      Modified by KHT to run at full speed, read ADC       *
 *                                                                           *
 * $Log: pwm.C,v $
 * Revision 1.3  2003/08/18 12:01:13  tos
 * Cosmetic preparation before release.
 *
 * Revision 1.2  2002/11/18 11:57:15  kht
 * Added startup macros
 *
 * Revision 1.1  2002/10/14 09:45:07  tos
 * Initial version in CVS.
 *
 *                                                                           *
 ****************************************************************************/
#include <chipcon/hal.h>
#include <chipcon/cc1010eb.h>


int duty_cycle = 128;

int main(){

    // 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=YLED=GLED=BLED=LED_OFF;
    RLED_OE(TRUE); YLED_OE(TRUE); GLED_OE(TRUE); BLED_OE(TRUE);

    // Setup PWM2 pin direction
    PORTDIRBIT(3, 4, POUT);

    // Configure timer 2 as a PWM timer, max timeout interval
    halConfigTimer23(TIMER2 | TIMER23_PWM, 0, CC1010EB_CLKFREQ);
    PWM2_SET_PERIOD(1);
    PWM2_SET_DUTY_CYCLE(duty_cycle);
    TIMER2_RUN(TRUE);

    // Setup ADC, select the CC1010EB pot meter, and turn it on
    halConfigADC(ADC_MODE_SINGLE | ADC_REFERENCE_VDD, CC1010EB_CLKFREQ,0); // 0: Threshold value (not used in this program)
    ADC_SELECT_INPUT(ADC_INPUT_AD0);
    ADC_POWER(TRUE); // Power up ADC from sleep mode

    // infinite loop
    while(1) {
        // read inputbutton
        
        duty_cycle = ADC_GET_SAMPLE_8BIT();
        ADC_SAMPLE_SINGLE();

        PWM2_SET_DUTY_CYCLE(duty_cycle);
    }
   
} // end main