/***********************************************************************************
  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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  who downloaded the software, his/her employer (which must be your employer)
  and Texas Instruments Incorporated (the "License").  You may not use this
  Software unless you agree to abide by the terms of the License. The License
  limits your use, and you acknowledge, that the Software may not be modified,
  copied or distributed unless embedded on a Texas Instruments microcontroller
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  YOU FURTHER ACKNOWLEDGE AND AGREE THAT THE SOFTWARE AND DOCUMENTATION ARE
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