ATmega128 串口通信程序（中断方式） 2011-06-05 20:08:10| 分类： 单片机程序编写 | 标签： |字号大中小 订阅 程序采用 IAR 系统编译，实现使用串口调试助手收发数据的功能 #include #include #include #define INT8U unsigned char #define INT16U unsigned int #define UDRIE0 5 /* UART Buffer Defines */ #define UART0_RX_BUFFER_SIZE 128 #define UART0_TX_BUFFER_SIZE 128 /* Static Variables */ static unsigned char UART0_RxBuf[UART0_RX_BUFFER_SIZE]; static volatile unsigned char UART0_RxHead; static volatile unsigned char UART0_RxTail; static unsigned char UART0_TxBuf[UART0_TX_BUFFER_SIZE]; static volatile unsigned char UART0_TxHead; static volatile unsigned char UART0_TxTail; static unsigned char UART0_Flag=1; void USART_INIT( void ) { UBRR0H = 0x00; UBRR0L = 0x0B;//9600 at 1.8432M UCSR0A = 0x20; UCSR0B = 0xD8;//开接收结束中断,发送结束中断接收使能,发送使能 UCSR0C = 0x06;//异步模式，1 位停止位，8 位数据位 UDR0 = 0x00;//清空数据寄存器 UART0_RxTail = 0; UART0_RxHead = 0; UART0_TxTail = 0; UART0_TxHead = 0; __disable_interrupt();//关全局中断 } void Tran_Byte( INT8U sdata ) { if(UART0_Flag == 0) { UDR0 = sdata; 

UART0_Flag = 1; } else { UART0_TxBuf[UART0_TxHead] = sdata; UART0_TxHead++; if(UART0_TxHead >= UART0_TX_BUFFER_SIZE) UART0_TxHead = 0; } __enable_interrupt(); } void Send_String( INT8U *string ) { INT8U temp; while(1) { temp = *string; Tran_Byte(temp); string++; if(*string == 0x00) break; } } INT8U HaveDataRxd( void ) { if(UART0_RxHead != UART0_RxTail) return 1; else return 0; } INT8U GetDataFromRxdBuf( void ) { INT8U temp; temp = UART0_RxBuf[UART0_RxTail]; UART0_RxTail ++ ; if( UART0_RxTail >= UART0_RX_BUFFER_SIZE ) { UART0_RxTail = 0 ; } return temp; } 

//清空接收缓冲区。 void UART_ResetRxBuffer( void ) { UART0_RxHead = 0; UART0_RxTail = 0; } int main( void ) { DDRA = 0xFF;PORTA = 0xFF; DDRE = 0xFE; INT8U tab; USART_INIT(); __enable_interrupt();//开全局中断 while(1) { __delay_cycles(10000); while(!HaveDataRxd()); tab = GetDataFromRxdBuf(); __delay_cycles(10000); Tran_Byte(tab); } } #pragma vector=USART0_RXC_vect __interrupt void USART0_RX( void ) { INT8U data; INT8U status; data = UDR0; /* read the received data */ status = UCSR0A; if((status & 0x18) == 0x00) { UART0_RxBuf[UART0_RxHead] = data; UART0_RxHead ++; if(UART0_RxHead == UART0_RX_BUFFER_SIZE) UART0_RxHead = 0; } } #pragma vector=USART0_TXC_vect __interrupt void USRAT0_TX( void ) { INT8U temp; /* check if all data is transmitted */ if(UART0_TxHead != UART0_TxTail) 

{ /* calculate buffer index */ temp = UART0_TxBuf[UART0_TxTail]; UDR0 = temp; UART0_TxTail ++; if(UART0_TxTail >= UART0_TX_BUFFER_SIZE) UART0_TxTail = 0; } else { UART0_Flag = 0; } }