mpy32_ex15_fractionMode.c

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//******************************************************************************
//******************************************************************************
#include "driverlib.h"
 
uint32_t Result;
uint16_t Result_Q15;
 
void main (void)
{
    //Stop Watchdog Timer
    WDT_A_hold(WDT_A_BASE);
 
    //Enable Fraction Mode
    MPY32_enableFractionalMode();
 
    //Set a 16-bit Operand into the specific Operand 1 register to specify
    //signed multiplication
    MPY32_setOperandOne16Bit(
        MPY32_MULTIPLY_SIGNED,
        0x7D70);
    //Set 16-bit Operand 2 to begin the multiplication operation
    MPY32_setOperandTwo16Bit(
        0x1000);
 
    //Read out Result
    Result = MPY32_getResult();
 
    Result_Q15 = (Result >> 16);
    //Q15 result == 0x0FAE
 
    //Disable Fraction Mode
    MPY32_disableFractionalMode();
 
    //Enter LPM4
    __bis_SR_register(LPM4_bits);
 
    //BREAKPOINT HERE to verify the correct Result_Q15
    __no_operation();
}