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Source code upload for AVR USART TX RX
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‎ATmega328-328P_Datasheet_Full.pdf

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‎ATmega328p_Fuse_Bits_Programming_Ext_Crystal.txt

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avrdude -c usbasp -p m328p -U lfuse:w:0xFF:m

‎_1_Serial_Transmit/main.c

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// AVR Send Character string "Hello from ATmega328p" Continously to the PC using Serial port.
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// PC receives the data and displays on terminal.
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// External Oscillator = 11.0592MHz
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//+------------------------------------------------------------------------------------------------+
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//| Compiler : AVR GCC (WinAVR) |
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//| Microcontroller : ATmega328p |
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//| Programmer : Rahul.Sreedharan |
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//| Date : 16-July-2019 |
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//+------------------------------------------------------------------------------------------------+
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//(C) www.xanthium.in
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// Visit to Learn More
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#include <stdint.h>
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#include <avr/io.h>
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#include <util/delay.h>
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// +-----------------------------------------------------------------------+ //
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// | ATmega328p Baudrate values for UBRRn for external crystal 11.0592MHz | //
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// +-----------------------------------------------------------------------+ //
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#define BAUD_RATE_4800_BPS 143 // 4800bps
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#define BAUD_RATE_9600_BPS 71 // 9600bps
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#define BAUD_RATE_14400_BPS 47 // 14.4k bps
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#define BAUD_RATE_19200_BPS 35 // 19.2k bps
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#define BAUD_RATE_28800_BPS 23 // 28.8k bps
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#define BAUD_RATE_38400_BPS 17 // 38.4k bps
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#define BAUD_RATE_57600_BPS 11 // 57.6k bps
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#define BAUD_RATE_76800_BPS 8 // 76.8k bps
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#define BAUD_RATE_115200_BPS 5 // 115.2k bps
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#define BAUD_RATE_230400_BPS 2 // 230.4k bps
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// +-----------------------------------------------------------------------+ //
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int main()
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{
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int i = 0;
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unsigned int ubrr = BAUD_RATE_230400_BPS;
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unsigned char data[] = "Hello from ATmega328p ";
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/* Set Baudrate */
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UBRR0H = (ubrr>>8); // Shift the 16bit value ubrr 8 times to the right and transfer the upper 8 bits to UBBR0H register.
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UBRR0L = (ubrr); // Copy the 16 bit value ubrr to the 8 bit UBBR0L register,Upper 8 bits are truncated while lower 8 bits are copied
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UCSR0C = 0x06; /* Set frame format: 8data, 1stop bit */
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UCSR0B = (1<<TXEN0); /* Enable transmitter */
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while(1) /* Loop the messsage continously */
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{
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i = 0;
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while(data[i] != 0) /* print the String "Hello from ATmega328p" */
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{
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while (!( UCSR0A & (1<<UDRE0))); /* Wait for empty transmit buffer */
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/* When UDRE0 = 0,data transmisson ongoing. */
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/* So NOT{[UCSR0A & (1<<UDRE0)] = 0} = 1 ,While(1) loop stays there */
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/* When UDRE0 = 1,data transmisson completed. */
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/* So NOT{[UCSR0A & (1<<UDRE0)] = 1} = 0 ,While(0) loop fails */
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UDR0 = data[i]; /* Put data into buffer, sends the data */
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i++; /* increment counter */
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}
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/* Sending '\n' '\r' Character pair helps to format the output properly on console putty Screen */
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/*************************************************************************************************/
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/* Send "\n" Character */
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while (!( UCSR0A & (1<<UDRE0))); /* Wait for empty transmit buffer */
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UDR0 = '\n'; /* Put data into buffer, sends the data */
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/* Send "\r" Character */
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while (!( UCSR0A & (1<<UDRE0))); /* Wait for empty transmit buffer */
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UDR0 = '\r'; /* Put data into buffer, sends the data */
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/*------------------------------------------------------------------------------------------------*/
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_delay_ms(100);
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}
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}//end of main
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‎_2_Serial_Receive/main.c

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// AVR Serial Reception @ 230.4k bps
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// AVR Receives character 'A' Blinks the LED on PC4
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// 'B' Beeps the Buzzer on PC5
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// External Oscillator = 11.0592MHz
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// Controller ATmega328p
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//+------------------------------------------------------------------------------------------------+
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//| Compiler : AVR GCC (WinAVR) |
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//| Microcontroller : ATmega328p |
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//| Programmer : Rahul.Sreedharan |
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//| Date : 16-July-2019 |
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//+------------------------------------------------------------------------------------------------+
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//(C) www.xanthium.in
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// Visit to Learn More
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#include <stdint.h>
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#include <avr/io.h>
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#include <util/delay.h>
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// +-----------------------------------------------------------------------+ //
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// | ATmega328p Baudrate values for UBRRn for external crystal 11.0592MHz | //
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// +-----------------------------------------------------------------------+ //
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#define BAUD_RATE_4800_BPS 143 // 4800bps
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#define BAUD_RATE_9600_BPS 71 // 9600bps
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#define BAUD_RATE_14400_BPS 47 // 14.4k bps
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#define BAUD_RATE_19200_BPS 35 // 19.2k bps
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#define BAUD_RATE_28800_BPS 23 // 28.8k bps
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#define BAUD_RATE_38400_BPS 17 // 38.4k bps
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#define BAUD_RATE_57600_BPS 11 // 57.6k bps
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#define BAUD_RATE_76800_BPS 8 // 76.8k bps
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#define BAUD_RATE_115200_BPS 5 // 115.2k bps
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#define BAUD_RATE_230400_BPS 2 // 230.4k bps
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// +-----------------------------------------------------------------------+ //
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int main()
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{
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unsigned int ubrr = BAUD_RATE_230400_BPS;
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PORTC = 0x00; //All LED's OFF
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PORTD = 0x00;
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/* Set Baudrate @ 230.4k bps */
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UBRR0H = (ubrr>>8);
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UBRR0L = (ubrr);
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/*Enable receiver */
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UCSR0B = (1<<RXEN0);
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/* Set frame format: 8data, 1stop bit */
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UCSR0C = 0x06;
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while(1)
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{
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while ( !(UCSR0A & (1<<RXC0)) ); /* Wait for data to be received */
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switch(UDR0) // using the switch() statement to control the LED and Buzzer
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{
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case 'A' : DDRC |= (1<<PC4); // Blinks LED
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PORTC |= (1<<PC4);
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_delay_ms(500);
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PORTC &= ~(1<<PC4);
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break;
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case 'B' : DDRC |= (1<<PC5); // Beeps Buzzer
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PORTC |= (1<<PC5);
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_delay_ms(500);
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PORTC &= ~(1<<PC5);
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break;
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default :
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break;
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}//end of Switch()
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}//end of While(1)
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}//end of main
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