unsigned int i; putchar(i&0xFF); putchar((i>>8)&0xFF);
unsigned int i; putchar(i&0xFF); putchar((i>>8)&0xFF);
UDR = 0x22 delay_ms(50) UDR = 0x33
/*****************************************************
Chip type : ATmega32
AVR Core Clock frequency: 11.059200 MHz
*****************************************************/
#include <mega32.h>
#ifndef RXB8
#define RXB8 1
#define TXB8 0
#define UPE 2
#define DOR 3
#define FE 4
#define UDRE 5
#define RXC 7
#endif
#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<DOR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)
#define StartSend() {tx_counter=0; UDR=tx_buffer[tx_counter++];}
// USART Transmitter buffer
#define TX_BUFFER_SIZE 2
char tx_buffer[TX_BUFFER_SIZE];
unsigned char tx_counter;
interrupt [USART_TXC] void usart_tx_isr(void)
{
if (tx_counter<TX_BUFFER_SIZE) UDR=tx_buffer[tx_counter++];
}
unsigned int WORD;
void main(void)
{
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: Off
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x48;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x47;
#asm("sei")
WORD = 0x3031;
tx_buffer[0] = WORD & 0xFF;
tx_buffer[1] = (WORD >> 8)& 0xFF;
StartSend();
while (1)
{
}
}
/*****************************************************
Chip type : ATmega32
AVR Core Clock frequency: 11.059200 MHz
*****************************************************/
#include <mega32.h>
#ifndef RXB8
#define RXB8 1
#define TXB8 0
#define UPE 2
#define DOR 3
#define FE 4
#define UDRE 5
#define RXC 7
#endif
#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<DOR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)
// USART Receiver buffer
#define RX_BUFFER_SIZE 2
char rx_buffer[RX_BUFFER_SIZE];
unsigned char rx_counter;
bit rx_buffer_overflow;
interrupt [USART_RXC] void usart_rx_isr(void)
{
char status,data;
status=UCSRA;
data=UDR;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
{
rx_buffer[rx_counter++]=data;
if (rx_counter == RX_BUFFER_SIZE)
{
rx_counter=0;
rx_buffer_overflow=1;
}
}
}
unsigned int WORD;
void main(void)
{
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: Off
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x90;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x47;
DDRA.0 =1;
#asm("sei")
while (1)
{
if(rx_buffer_overflow)
{
rx_buffer_overflow =0;
WORD = rx_buffer[0] | (rx_buffer[1]<<8);
if(WORD == 0x3031) PORTA.0=1;
}
}
}
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