gpio_toggle_output.c

/*
 * Copyright (c) 2023, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "ti_msp_dl_config.h"

/* This results in approximately 0.5s of delay assuming 32MHz CPU_CLK */
#define DELAY (16000000)

int main(void)
{
    /* Power on GPIO, initialize pins as digital outputs */
    SYSCFG_DL_init();

    /* Default: LED1 and LED3 ON, LED2 OFF */
    DL_GPIO_clearPins(LED_PORT, LED_PIN_1_PIN | LED_PIN_2_PIN |
        LED_PIN_3_PIN | LED_PIN_4_PIN |
        LED_PIN_5_PIN | LED_PIN_6_PIN |
        LED_PIN_7_PIN | LED_PIN_8_PIN);

    while (1) {
        /*
         * Call togglePins API to flip the current value of LEDs 1-3. This
         * API causes the corresponding HW bits to be flipped by the GPIO HW
         * without need for additional R-M-W cycles by the processor.
         */
        delay_cycles(DELAY);
        DL_GPIO_togglePins(LED_PORT, LED_PIN_1_PIN | LED_PIN_2_PIN |
            LED_PIN_3_PIN | LED_PIN_4_PIN |
            LED_PIN_5_PIN | LED_PIN_6_PIN |
            LED_PIN_7_PIN | LED_PIN_8_PIN);
    }
}