blink.c

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/**
 * @file blink.c
 * @ingroup getting_started
 * @author Jason Duffy
 * @date 15th March 2022
 * @brief Driver for example application from Getting Started with Blink.
 * This file also serves to demonstrate the anatomy of embedded firmware. 
 * @bug No known bugs.
 */
 
 
 
// Include the header file containing the _delay_ms() macro.
#include <util/delay.h>
 
// Include the header file containing pin and port definitions. 
#include "pin_defines.h"
 
// Include the header file for this module. 
#include "blink.h"
 
 
 
// Define the blink delay time in milliseconds here.
#define BLINK_TIME_MS   1000
 
 
 
/*
 * Call this function once on entry of main() routine to configure settings and
 * initialise the LED for use. 
 */
void init_led(void)
{
    LED_DDR |= (1 << LED_GPIO); // Set LED_GPIO as output
}
 
 
/*
 * Call this function in the loop of the main() routine to blink the LED.
 */
void blink_led(void)
{
    LED_PORT |= (1 << LED_GPIO); // Turn LED on
    _delay_ms(BLINK_TIME_MS); // Wait a specified length of time
 
    LED_PORT &= ~(1 << LED_GPIO); // Turn LED off 
    _delay_ms(BLINK_TIME_MS); // Wait a specified length of time
}
 
 
/*** end of file ***/