AVR ATMEGA8 Serial Port USART-EEWORLD

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The avr serial port configuration is very simple, just configure a few registers to send and receive;

But there are a few things to understand:

1. Once the serial port is successfully configured, the IO function is automatically occupied, which is different from LPC or STM8/32 (registered configuration is required);

2. There is no dedicated serial port opening or closing position (the entire serial port);

3. When reading and writing control register C, the URSEL bit needs to be written as 1, and when reading and writing the UBRRH register, URSEL needs to be written as 0;

1: //Crystal oscillator frequency

2: #define F_CPU 6000000UL

3: //Baud rate

4: #define BAUD 9600

6: //M8 serial port 1 initialization

7: void UsartInit(void)

8: {

9: unsigned int tmp;

10: FifoInit(&RxFifo, sizeof(RxFifo.data));

11: FifoInit(&TxFifo, sizeof(TxFifo.data));

12: tmp= F_CPU/BAUD/16-1;

13: SetBit(SREG, 7);

14: UCSRB = 0;

15: UCSRC = 0;

16: UBRRH=(unsigned char)(tmp>>8);

17: UBRRL=(unsigned char)tmp;

18: UCSRB |= (1< 19: UCSRC |= (1 << URSEL)|(1< 20: }

Keywords：AVR ATMEGA8 USART Reference address：AVR ATMEGA8 Serial Port USART

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