PIC serial communication program (2) interrupt 1602 echo-EEWORLD

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/***************************************************************************************************

*** Function: The serial port debugging assistant sends data to 877, and 877 forwards it back to the serial port assistant after receiving it

*** Experimental content: Send data to 877 through the PC software "Serial Port Debug Assistant" c,

877 sends the received data to the computer

*** Development board connection method: Use a serial cable to connect to the serial port on the microcontroller development board.

The other end is connected to the 9-pin serial port of the computer. If there is no serial port, please purchase a USB to serial cable.

****************************************************************************************************/

#include //Includes the predefined internal resources of the MCU

__CONFIG(0xFF32); //Chip configuration word, watchdog off, power-on delay on, power-off detection off, low voltage programming off, encryption, 4M crystal HS oscillation

#define rs RA5

#define rw RA4

#define and RA3

unsigned char recdata;

void init(); //Declare I/O port initialization function

void lcd_init(); //Declare LCD initialization function

void write(char x); //Declare the function to display 1 byte data

void lcd_enable(); //Declare LCD display setting function

void delay(); //Declare the delay function

void writelcd(char *pt); //Declare LCD write string function

/****************************************************************************

* Name: main()

* Function: Main function

* Entry parameters: None

* Export parameters: None

* Description: None

****************************************************************************/

void main()

{

TRISC=0XFF; //Set the direction of port C to output

SPBRG=0XC; //Set the baud rate to 19200BPS

TXSTA=0X24; //Enable serial port transmission and select high-speed baud rate

RCSTA=0X90; //Enable serial port, continuous reception

RCIE=0X1; //Enable receive interrupt

GIE=0X1; //Open global interrupt

PEIE=0X1; //Enable external interrupt

init(); //Call I/O port initialization function

lcd_init(); //Call LCD initialization function

while(1) //wait for interrupt

{

;

}

/****************************************************************************

* Name: usart()

* Function: interrupt function

* Entry parameters:

* Export parameters:

* Note: Note that the keyword interrupt is required. If there are multiple interrupts, in the interrupt service function,

To determine the interrupt source flag

****************************************************************************/

void interrupt usart(void)

{

int i;

if(RCIE&&RCIF) //Judge whether it is a serial port receiving interrupt

{

TXREG=RCREG;

write(TXREG); //Only 3 characters can be displayed, is there a problem? ???

}

/****************************************************************************

* Name: init()

* Function: I/O port initialization

****************************************************************************/

void init()

{

ADCON1 = 0X07; //Set port A to a normal I/O port

RA1=1;

TRISA = 0X00; //Set port A to output

TRISD = 0X00; //Set port D to output

}

/****************************************************************************

* Name: lcd_init()

* Function: LCD initialization

****************************************************************************/

void lcd_init()

{

PORTD = 0X1; // Clear display

lcd_enable();

PORTD = 0X38; //8-bit 2-row 5*7 dot matrix

lcd_enable();

PORTD = 0X0e; //Display on, cursor on, blinking

lcd_enable();

PORTD = 0X06; //The text does not move, the cursor moves right

lcd_enable();

PORTD = 0X80; //Company web display address

lcd_enable();

}

/****************************************************************************

* Name: write()

* Function: Write one byte of data to LCD

* Input parameter: char x character

****************************************************************************/

void write(char x)

{

PORTD = x; //Send the data to be displayed to PORTD

rs = 1; //This byte is data, not a command

rw = 0; //This operation is a write, not a read

e = 0; // Pull the enable signal low

delay(); //Keep the enable signal low for a while

e = 1; //Pull up the enable signal to establish the rising edge required for LCD operation

}

/****************************************************************************

* Name: lcd_enable()

* Function: LCD display settings

****************************************************************************/

void lcd_enable()

{

rs = 0; //This byte data is a command, not data

rw = 0; //This operation is a write, not a read

e = 0; // Pull the enable signal low

delay(); //Keep the enable signal low for a while

e = 1; //Pull up the enable signal to establish the rising edge required for LCD operation

}

/****************************************************************************

* Name: delay()

* Function: Delay

****************************************************************************/

void delay()

{

int i;

for (i = 0;i < 5000;i++);

}

Keywords：PIC Reference address：PIC serial communication program (2) interrupt 1602 echo

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