sac_ex1_oaGPMode.c

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 * Copyright (c) 2017, Texas Instruments Incorporated
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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//******************************************************************************
#include "Board.h"
#include "driverlib.h"
 
int main(void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    //Configure OA0 functionality
    GPIO_setAsPeripheralModuleFunctionOutputPin(
            GPIO_PORT_SACOA0O,
            GPIO_PIN_SACOA0O,
            GPIO_FUNCTION_SACOA0O);
    GPIO_setAsPeripheralModuleFunctionInputPin(
            GPIO_PORT_SACOA0N,
            GPIO_PIN_SACOA0N,
            GPIO_FUNCTION_SACOA0N);
    GPIO_setAsPeripheralModuleFunctionInputPin(
            GPIO_PORT_SACOA0P,
            GPIO_PIN_SACOA0P,
            GPIO_FUNCTION_SACOA0P);
 
    /*
     * Disable the GPIO power-on default high-impedance mode
     * to activate previously configured port settings
     */
    PMM_unlockLPM5();
 
    //Select external source for both positive and negative inputs
    SAC_OA_init(
            SAC0_BASE,
            SAC_OA_POSITIVE_INPUT_SOURCE_EXTERNAL,
            SAC_OA_NEGATIVE_INPUT_SOURCE_EXTERNAL);
 
    //Select low speed and low power mode
    SAC_OA_selectPowerMode(
            SAC0_BASE,
            SAC_OA_POWER_MODE_LOW_SPEED_LOW_POWER);
    //Enable OA
    SAC_OA_enable(SAC0_BASE);
    //Enable SAC
    SAC_enable(SAC0_BASE);
 
    //Enter LPM3
    __bis_SR_register(LPM3_bits);
    //For debug
    __no_operation();
}