/***********************************************************************************
  Filename:     hal_mcu.c

  Description:  hal mcu library

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


#include "hal_types.h"
#include "hal_mcu.h"

#include "clock.h"

/***********************************************************************************
* @fn          halMcuInit
*
* @brief       Set system clock
*
* @param       none
*
* @return      none
*/
void halMcuInit(void)
{
    clockSetMainSrc(CLOCK_SRC_XOSC);
}


/***********************************************************************************
* @fn          halMcuWaitUs
*
* @brief       Busy wait function. Waits the specified number of microseconds. Use
*              assumptions about number of clock cycles needed for the various
*              instructions. The duration of one cycle depends on MCLK. In this HAL
*              , it is set to 8 MHz, thus 8 cycles per usec.
*
*              NB! This function is highly dependent on architecture and compiler!
*
* @param       uint16 usec - number of microseconds delay
*
* @return      none
*/
void halMcuWaitUs(uint16 usec)
{
    while(usec--)
    {
        asm("nop");
        asm("nop");
        asm("nop");
        asm("nop");
        asm("nop");
        asm("nop");
        asm("nop");
        asm("nop");
        asm("nop");
        asm("nop");
    }
}

/***********************************************************************************
* @fn          halMcuWaitMs
*
* @brief       Busy wait function. Waits the specified number of milliseconds. Use
*              assumptions about number of clock cycles needed for the various
*              instructions.
*
*              NB! This function is highly dependent on architecture and compiler!
*
* @param       uint16 millisec - number of milliseconds delay
*
* @return      none
*/
void halMcuWaitMs(uint16 msec)
{
    while(msec--)
        halMcuWaitUs(1000);
}

/***********************************************************************************
* @fn          halMcuSetLowPowerMode
*
* @brief      Sets the MCU in a low power mode. Will turn global interrupts on at
*             the same time as entering the LPM mode. The MCU must be waken from
*             an interrupt (status register on stack must be modified).
*
*              NB! This function is highly dependent on architecture and compiler!
*
* @param       uint8 mode - power mode
*
* @return      none
*/
void halMcuSetLowPowerMode(uint8 mode)
{
  // comment: not yet implemented
  //HAL_ASSERT(FALSE);
}


/******************************************************************************
* @fn  halMcuReset
*
* @brief
* Resets the MCU. This utilize the watchdog timer as there is no other way
* for a software reset. The reset will not occur until ~2 ms.
* NB: The function will not return! (hangs until reset)
*
* Parameters:
*
* @param  void
*
* @return void
*
******************************************************************************/
void halMcuReset(void)
{
    const uint8 WDT_INTERVAL_MSEC_2=   0x03;   // after ~2 ms

    WDCTL = ((WDCTL & 0xFC) | (WDT_INTERVAL_MSEC_2 & 0x03));
    // Start watchdog
    WDCTL &= ~0x04;     // Select watchdog mode
    WDCTL |= 0x08;      // Enable timer
    while(1);                                   // Halt here until reset
}

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

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  granted under the terms of a software license agreement between the user
  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
  or used solely and exclusively in conjunction with a Texas Instruments radio
  frequency transceiver, which is integrated into your product.  Other than for
  the foregoing purpose, you may not use, reproduce, copy, prepare derivative
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