Use of AVR serial port getchar(), getchar(), printf() and other functions-EEWORLD

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Use of AVR serial port getchar(), getchar(), printf() and other functions

AVR microcontrollers can use getchar(), getchar(), printf() and other functions, and their operations are connected to the serial port by default.

You need to include stdio.h. ICC will include this file by default, but it is still recommended that you write this sentence #include

CODE:

//ICC-AVR application builder : 2007-5-25 21:35:24
// Target : M16
// Crystal: 7.3728Mhz
// Purpose: Demonstrate the use of getchar(), getchar(), printf() and other functions.
// Author: Gu Xin
// AVR and Virtual Instruments [url]http://www.avrvi.com[/url]
// Use 7.3728M external crystal oscillator, note: please short jumper JP2 1 and 2, power jumper connected to 3.3V or 5V
// Serial port connection method using JP4: 1 and 2 short, use RS232, please pay attention to the schematic diagram next to the jumper
// Development board connection: no connection

#include
#include
#include

//UART0 initialize
// desired baud rate: 9600
// actual: baud rate:9600 (0.0%)
// char size: 8 bit
// parity: Disabled
void uart0_init(void)
{
UCSRB = 0x00; //disable while setting baud rate
UCSRA = 0x00;
UCSRC = BIT(URSEL) | 0x06;
UBRRL = 0x2F; //set baud rate lo
UBRRH = 0x00; //set baud rate hi
UCSRB = 0x18;
}

void main(void)
{
unsigned char i;
uart0_init(); //Initialize the serial port
printf("[url]www.avrvi.com[/url]rn"); //Output string
while(1)
{
i=getchar(); //Read a character
putchar((signed char)i); //Output character
if(i=='a') printf("OKrn");//If the input is a, output OK, add a carriage return and a line feed.
if(i=='A') printf("GOODt");//If the input is A, output GOOD, add a TAB symbol.
}
}

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The effect in the serial port debugging assistant is as follows

[Reprint] AVR serial port <wbr>getchar(), getchar(), printf() and other functions

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