PIC microcontroller printf() function redirection-EEWORLD

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Basic Information:

System: Windows 10

Compiler: MPLAB X IDE V3.26 + XC8 V1.45

Microcontroller: PIC18F66K22

Downloader: PICKit3

1. Serial port initialization

Function name: void USART1_Init( void )

Function: Use serial port 1, serial port initialization

void USART1_Init( void )

{

TRISC6 = 1;

TRISC7 = 1; // Input mode, multiplexing function

TX91 = 0; // 8-bit transmission

TXEN1 = 1;

SYNC1 = 0; // Asynchronous mode

BRGH1 = 1;

RX91 = 0;

CREN1 = 1;

SPEN1 = 1; // Enable the serial port

SPBRG1 = 207; // baud rate 9600

}

2. printf() function redirection

The printf function does two things: it formats the text based on the format string and placeholders you specify, and sends (prints) the formatted text to the destination (or stream). It then calls a putch function to send each byte of the formatted text.

Function name: void putch( char ch )

Function: redirect printf function

void putch( char ch )

{

while( !TX1IF )

continue;

TXREG1 = ch;

}

END

Reference address：PIC microcontroller printf() function redirection

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