Task 4: Control the on and off of the specified LED

This series of tutorials takes AVR microcontroller as the object and introduces the rapid development method of microcontroller.

Reference textbook: "Microcontroller Technology and Application Project Tutorial" Luan Qiuping Electronic Industry Press 2019.6 1st edition

This article introduces the method of controlling the on and off of a specified LED.

1. Understanding bit operations in C language

//Add include files

#include "../include.h"

//Define system constants

//Define global variables

//Main program

int main(void)

{

//Define local variables

// Target board initialization, this function will automatically initialize the corresponding peripheral files

TARGET_Init();

// Initialize global variables

//When power is turned on, the corresponding operations are performed

DDRC = 0xFF;

//Background main loop

while(1)

{

//Complete your own project logic here

PORTC = 0xFB;

TARGET_Delayms(1000, 1);

PORTC = 0xFF;

TARGET_Delayms(1000, 1);

// Feed the dog statement, most projects should not remove it

#if INTERNAL_PERIPHERAL_WDT_MODE != 0

TARGET_WatchDogReset();

#endif

}

return 0; //never execute

}

2. Manipulate the specified bit in the register

//Add include files

#include "../include.h"

//Define system constants

//Define global variables

//Main program

int main(void)

{

//Define local variables

// Target board initialization, this function will automatically initialize the corresponding peripheral files

TARGET_Init();

// Initialize global variables

//When power is turned on, the corresponding operations are performed

DDRC |= (1 << 2);

//Background main loop

while(1)

{

//Complete your own project logic here

PORTC &= ~(1 << 2);

TARGET_Delayms(1000, 1);

PORTC |= (1 << 2);

TARGET_Delayms(1000, 1);

// Feed the dog statement, most projects should not remove it

#if INTERNAL_PERIPHERAL_WDT_MODE != 0

TARGET_WatchDogReset();

#endif

}

return 0; //never execute

}

3. Set high, set low and invert function macros

//Add include files

#include "../include.h"

//Define system constants

//Define global variables

//Main program

int main(void)

{

//Define local variables

// Target board initialization, this function will automatically initialize the corresponding peripheral files

TARGET_Init();

// Initialize global variables

//When power is turned on, the corresponding operations are performed

SETBIT(DDRC, BIT2);

//Background main loop

while(1)

{

//Complete your own project logic here

CLRBIT(PORTC, BIT2);

TARGET_Delayms(1000, 1);

SETBIT(PORTC, BIT2);

TARGET_Delayms(1000, 1);

// Feed the dog statement, most projects should not remove it

#if INTERNAL_PERIPHERAL_WDT_MODE != 0

TARGET_WatchDogReset();

#endif

}

return 0; //never execute

}

//Function macro, the following content is not related to transplantation

#define SETBIT(x, y) (x |= y)

#define CLRBIT(x, y) (x &= ~y)

#define CPLBIT(x, y) (x ^= y)

#define CHKBIT(x, y) (x & y)

#define BIT(x) (1<#define BIT0 BIT(0)

#define BIT1 BIT(1)

#define BIT2 BIT(2)

#define BIT3 BIT(3)

#define BIT4 BIT(4)

#define BIT5 BIT(5)

#define BIT6 BIT(6)

#define BIT7 BIT(7)

#define BIT8 BIT(8)

#define BIT9 BIT(9)

#define BITA BIT(10)

#define BITB BIT(11)

#define BITC BIT(12)

#define BITD BIT(13)

#define BITE BIT(14)

#define BITF BIT(15)