hal_timer_32k.c

cc2430的源程序

/***********************************************************************************
  Filename:     hal_timer_32k.c

  Description:  hal 32KHz timer

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

/***********************************************************************************
* INCLUDES
*/
#include "hal_types.h"
#include "hal_defs.h"
#include "hal_timer_32k.h"
#include "hal_board.h"
#include "hal_int.h"
#include "hal_assert.h"

/***********************************************************************************
* LOCAL VARIABLES
*/
static ISR_FUNC_PTR fptr;


/***********************************************************************************
* @fn      halTimer32kInit
*
* @brief    Set up timer 1  to generate an interrupt every "cycles" 32768 Hz
*           clock cycles.
*           Use halTimerIntConnect() to connect an ISR to the interrupt.
*
* @param   uint16 cycles - Number of cycles between interrupt
*		   (does not support larger cycles value than 0xFFFF/8)
*
* @return  none
*/
void halTimer32kInit(uint16 cycles)
{
	uint16 compareValue;
	
    //uint16 clock_divider = ID_0; // Default - don't divide input clock

	// Set prescaler divider value to 128
	T1CTL |= 0x0C;

	// Multiply cycles by 8 to get 32KHz cycles
	// 32MHz/128/8 gives approximately 32KHz
	if (cycles > 0xFFFF/8){
		compareValue =0xFFFF;
		HAL_ASSERT(FALSE);
	}
	else{
		compareValue = cycles*8;
    }

    // Set compare value
    T1CC0H = HI_UINT16(compareValue);
	T1CC0L = LO_UINT16(compareValue);

    // clear interrupt pending flag, disable interrupt
	T1CTL &= ~0x10; // T1CTL.OVFIF = 0
    IEN1  &=  ~0x02; // IEN1.T1EN = 0
}


/***********************************************************************************
* @fn      halTimer32kRestart
*
* @brief   Restart timer 1. The timer is first stopped, then restarted,
*          counting up from 0
*
* @param   none
*
* @return  none
*/
void halTimer32kRestart(void)
{
	HAL_ASSERT(FALSE);
    // not implemented
}


/***********************************************************************************
* @fn      halTimer32kIntConnect
*
* @brief   Connect function to timer interrupt
*
* @param   ISR_FUNC_PTR isr - pointer to function
*
* @return  none
*/
void halTimer32kIntConnect(ISR_FUNC_PTR isr)
{
    istate_t key;
    HAL_INT_LOCK(key);
    fptr = isr;
    HAL_INT_UNLOCK(key);
}


/***********************************************************************************
* @fn      halTimer32kIntEnable
*
* @brief   Enable 32KHz timer interrupt
*
* @param   none
*
* @return  none
*/
void halTimer32kIntEnable(void)
{
    IEN1 |=  0x02; // IEN1.T1EN = 1

	// Start timer in modulo mode
	T1CTL |= 0x02; // T1CTL.MODE = 10

}


/***********************************************************************************
* @fn      halTimer32kIntDisable
*
* @brief   Disable 32KHz timer interrupt
*
* @param   none
*
* @return  none
*/
void halTimer32kIntDisable(void)
{
     IEN1  &=  ~0x02; // IEN1.T1EN = 0
}


/***********************************************************************************
* @fn      timer32k0_ISR
*
* @brief   ISR framework for the 32KHz timer component
*
* @param   none
*
* @return  none
*/

HAL_ISR_FUNCTION(T1_ISR,T1_VECTOR)
{
   if (fptr != NULL)
   {
        (*fptr)();
   }
}


/***********************************************************************************
  Copyright 2007 Texas Instruments Incorporated. All rights reserved.

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  limits your use, and you acknowledge, that the Software may not be modified,
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