AVRWARE++ Development Notes 6: 8-way direct I/O port control LED light experiment

         This article is only for beginners, experts please skip it!

    1. Experimental purpose

    Use the IO port of the microcontroller to directly control the LED light and learn how to control the LED light. 

    2. Experimental content

    Write a program to make LEDs 0 to 7 light up from both sides to the middle at an interval of 200ms, and finally all light up for 200ms and then turn off.

    3. Hardware Principle

    The hardware schematic diagram of 8-way direct I/O port controlling LED lights is shown in the figure below. Use a flat cable to connect to terminal P4, then the 0-7 pins of the corresponding port of the microcontroller are connected to the LED0-LED7 pins of terminal P4 (for example, use a flat cable to connect P10 to terminal P4, then the PD0 pin is connected to LED0, the PD1 pin is connected to LED1,... the PD7 pin is connected to LED7). Pins 9 and 10 of terminal P4 are connected to 5V VCC. It can be seen from the figure that the LED is lit at a low level. The corresponding pin of the microcontroller sends a low level, the LED is on, and the corresponding pin of the microcontroller sends a high level, and the LED is off. 

    4. Experimental reference procedures and annotations

    Change the mapping layer 1_AbstractionLayer_HAL.h file 

//PortD

#define IO_PD_DIR 0b11111111 //This indicates that pins 0-7 are all output

#define IO_PD_OUT 0b11111111 //This specifies that the default initial state of pins 0-7 is high, that is, when powered on,

                                      /LED0-LED7 pins give high level, transistors are not conducting, and the LED lights are off

////////////////////////////////////////////////////////////////////////////////////

//Function macro definition

#define LED0BIT0

#define LED1BIT1

#define LED2BIT2

#define LED3BIT3

#define LED4BIT4

#define LED5BIT5

#define LED6BIT6

#define LED7BIT7

#define LED0_OPENCLRBIT(PORTD,LED0)

#define LED0_SHUTSETBIT(PORTD,LED0)

#define LED0_TURNCPLBIT(PORTD,LED0)

#define LED1_OPENCLRBIT(PORTD,LED1)

#define LED1_SHUTSETBIT(PORTD,LED1)

#define LED1_TURNCPLBIT(PORTD,LED1)

#define LED2_OPENCLRBIT(PORTD,LED2)

#define LED2_SHUTSETBIT(PORTD,LED2)

#define LED2_TURNCPLBIT(PORTD,LED2)

#define LED3_OPENCLRBIT(PORTD,LED3)

#define LED3_SHUTSETBIT(PORTD,LED3)

#define LED3_TURNCPLBIT(PORTD,LED3)

#define LED4_OPENCLRBIT(PORTD,LED4)

#define LED4_SHUTSETBIT(PORTD,LED4)

#define LED4_TURNCPLBIT(PORTD,LED4)

#define LED5_OPENCLRBIT(PORTD,LED5)

#define LED5_SHUTSETBIT(PORTD,LED5)

#define LED5_TURNCPLBIT(PORTD,LED5)

#define LED6_OPENCLRBIT(PORTD,LED6)

#define LED6_SHUTSETBIT(PORTD,LED6)

#define LED6_TURNCPLBIT(PORTD,LED6)

#define LED7_OPENCLRBIT(PORTD,LED7)

#define LED7_SHUTSETBIT(PORTD,LED7)

#define LED7_TURNCPLBIT(PORTD,LED7)

#define ALL_LED_OPEN //Open all LEDs LED0_OPEN;LED1_OPEN;LED2_OPEN;LED3_OPEN;LED4_OPEN;LED5_OPEN;LED6_OPEN;LED7_OPEN

#define ALL_LED_SHUT //Turn off all LEDs LED0_SHUT;LED1_SHUT;LED2_SHUT;LED3_SHUT;LED4_SHUT;LED5_SHUT;LED6_SHUT;LED7_SHUT

    Modify the logic layer 0_logiclayer_main.c file

//Main program

int main(void)

{

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

    TARGET_Init();

    //Background main loop

    while(1)

    {

        //Complete your own project logic here

        LED0_OPEN;

        LED7_OPEN;

        TARGET_Delayms(200,1);

        LED0_SHUT;

        LED7_SHUT;

        TARGET_Delayms(200,1);

        LED1_OPEN;

        LED6_OPEN;

        TARGET_Delayms(200,1);

        LED1_SHUT;

        LED6_SHUT;

        TARGET_Delayms(200,1);

        LED2_OPEN;

        LED5_OPEN;

        TARGET_Delayms(200,1);

        LED2_SHUT;

        LED5_SHUT;

        TARGET_Delayms(200,1);

        LED3_OPEN;

        LED4_OPEN;

        TARGET_Delayms(200,1);

        LED3_SHUT;

        LED4_SHUT;

        TARGET_Delayms(200,1);

        ALL_LED_OPEN;

        TARGET_Delayms(200,1);

        ALL_LED_SHUT;

        TARGET_Delayms(200,1);

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

        #if WDT_MODE!=0

            TARGET_WatchDogReset();

        #endif

    }

    return 0; // never executed

}