its_mcu.c

program show the communication of CC100-MSP430

/******************************************************************************
    Filename: ITS_mcu.c

    Copyright 2007 Texas Instruments, Inc.
******************************************************************************/

#include "ITS_types.h"
#include "ITS_defs.h"
#include "ITS_board.h"
#include "ITS_mcu.h"


//-----------------------------------------------------------------------------
//  void ITSMcuWaitUs(uint16 usec)
//
//  DESCRIPTION:
//    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 4 MHz, thus 4 cycles per usec.
//
//    NB! This function is highly dependent on architecture and compiler!
//-----------------------------------------------------------------------------
void ITSMcuWaitUs(uint16 usec) // 5 cycles for calling
{
    // The least we can wait is 3 usec:
    // ~1 usec for call, 1 for first compare and 1 for return

    while(usec > 3)       // 2 cycles for compare
    {                     // 2 cycles for jump
        asm("NOP");       // 1 cycles for nop
        asm("NOP");       // 1 cycles for nop
        asm("NOP");       // 1 cycles for nop
        asm("NOP");       // 1 cycles for nop
        asm("NOP");       // 1 cycles for nop
        usec -= 2;        // 1 cycles for optimized decrement
    }
}                         // 4 cycles for returning



//-----------------------------------------------------------------------------
//  void ITSMcuSetLowPowerMode(uint8 mode)
//
//  DESCRIPTION:
//    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).
//-----------------------------------------------------------------------------
void ITSMcuSetLowPowerMode(uint8 mode)
{
    switch (mode)
    {
        case HAL_MCU_LPM_0:
            __low_power_mode_0();
            break;
        case HAL_MCU_LPM_1:
            __low_power_mode_1();
            break;
        case HAL_MCU_LPM_2:
            __low_power_mode_2();
            break;
        case HAL_MCU_LPM_3:
            __low_power_mode_3();
            break;
        case HAL_MCU_LPM_4:
            __low_power_mode_4();
            break;
    }
}