Summary of UART communication of AVR microcontroller ATMega16

#include

typedef unsigned char uint8_t;

#define DF_Config_Uart0_BaudRate 9600

//UART0 initialization
// desired baud rate: 9600
// actual: baud rate:9600 (0.0%)
void uart0_init(void)
{
 UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = BIT(URSEL) | 0x06;

 //Configure baud rate
#if DF_Config_Uart0_BaudRate==9600

//----------11.0592M 9600kbps:
 UBRRL = 0x47; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi
 
#else if DF_Config_Uart0_BaudRate==19200

 //----------11.0592M 19200kbps:
 UBRRL = 0x23; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi

#endif

 UCSRB = 0x98;
}

// Send a byte
void uart0_sendByte(uint8_t dat)
{
  while(!(UCSRA&(1<   UDR=dat; //Send data
}

// Send multiple bytes of data
void uart0_sendData(uint8_t *pDat,uint8_t nCount)
{
uint8_t i;
uint8_t *p = pDat;
for (i=0; i {
uart0_sendByte(*p++);
}
}
// Send string
void uart0_sendString(uint8_t *pDat)
{
uint8_t *p = pDat;
while(*p)
{
uart0_sendByte(*p++);
}
}

// Serial port receive interrupt
#pragma interrupt_handler uart0_rx_isr:iv_USART0_RXC
void uart0_rx_isr(void)
{
 //uart has received a character in UDR
 #if 1 // For test
  uint8_t dat=UDR;
  uart0_sendByte(dat);
 #else
 
 #endif
}

/*-----------------------------------------------------------------
Function name: void uart_receive(void)
Function function: Query mode, receive data
Parameter: 
Return value: None
-----------------------------------------------------------------*/
uint8_t uart0_receive(void) //Define the return value type, otherwise an error
{
  while(!(UCSRA&(1<   return UDR; //Get and return the received data
}

/*