clock.c

cc2x30_sw_examples: 适用于SmartRF05EB 支持CC2430、CC2530 提供Light_Switch及perTest例程。

/******************************************************************************
    Filename: clock.c

    This file defines clock related functions for the CC243x family
    of RF system-on-chips from Texas Instruments.

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

/*******************************************************************************
 * INCLUDES
 */

#include "clock.h"
#include <hal_mcu.h>


/*******************************************************************************
 * PUBLIC FUNCTIONS
 */


/******************************************************************************
* @fn     clockSetMainSrc
*
* @brief  Function for setting the main system clock source.
*         The function turns off the clock source that is not being used.
*         TICKSPD is set to the same frequency as the source.
*
* @param  uint8 source (one of CLOCK_SRC_HFRC or CLOCK_SRC_XOSC)
*
* @return void
*
******************************************************************************/
void clockSetMainSrc(uint8 source)
{
    register uint8 osc32k_bm = CLKCON & CLKCON_OSC32K_BM;

    // Source can have the following values:
    // CLOCK_SRC_XOSC   0x00  High speed Crystal Oscillator (XOSC)
    // CLOCK_SRC_HFRC   0x01  Low power RC Oscillator (HFRC)

    if (source == CLOCK_SRC_HFRC)
    {
        SLEEP &= ~SLEEP_OSC_PD_BM;       // power up both oscillators
        while (!CC2430_IS_HFRC_STABLE());// wait until the oscillator is stable

        asm("NOP");
        CLKCON = (osc32k_bm | CLKCON_OSC_BM | TICKSPD_DIV_2 | CLKCON_CLKSPD_BM);
        while (CLKCON != (osc32k_bm | CLKCON_OSC_BM | TICKSPD_DIV_2 | CLKCON_CLKSPD_BM));

        SLEEP |= SLEEP_OSC_PD_BM;        // power down the unused oscillator
    }
    else if (source == CLOCK_SRC_XOSC)
    {
        SLEEP &= ~SLEEP_OSC_PD_BM;       // power up both oscillators
        while (!CC2430_IS_XOSC_STABLE());// wait until the XOSC is stable

        asm("NOP");
        halMcuWaitUs(64);
        CLKCON = (osc32k_bm | TICKSPD_DIV_1);
        while (CLKCON != (osc32k_bm | TICKSPD_DIV_1));

        SLEEP |= SLEEP_OSC_PD_BM;        // power down the unused oscillator
    }

}

/******************************************************************************
* @fn     clockSelect32k
*
* @brief  Function for selecting source for the 32kHz oscillator
*
* @param  uint8 source (one of CLOCK_32K_XTAL or CLOCK_32K_RCOSC)
*
* @return void
*
******************************************************************************/
void clockSelect32k(uint8 source)
{
    if (source == CLOCK_32K_XTAL)
    {
        CLKCON &= ~CLKCON_OSC32K_BM;
    }
    else if (source == CLOCK_32K_RCOSC)
    {
        CLKCON |= CLKCON_OSC32K_BM;
    }
}

/*------------------------------------------------------------------------------
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								ooo0	 (	 )                                     
								(	)	  ) /                                      
								 \ (	 (_/                                       
								  \_)		 Modify By:cuiqingwei [gary]                  
------------------------------------------------------------------------------*/