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只要用串口精灵发送大文件,就会收几个字节自动复位一次。由于我在初始化时,蜂鸣器响一声,所以每次蜂鸣器鸣响,表示自动复位了一次。
/*****************************************************
Chip type : ATmega16L
Program type : Application
Clock frequency : 11.059200 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 256
*****************************************************/
#include <mega16.h>
#include <delay.h>
#define buzzer_port PORTD.7
void buzzer(unsigned char times)
{
unsigned char i=0;
unsigned int buzzer_time=0;
while(i<times)
{
for(buzzer_time=0;buzzer_time<40;buzzer_time++)
{
buzzer_port=~buzzer_port;
delay_us(250);
}
i++;
}
buzzer_port=1;
}
//********************************
// USART
//********************************
//UCSRA
#define RXC 7 //½ÓÊÕ½áÊø±êÖ¾
#define TXC 6 //·¢ËͽáÊø±êÖ¾
#define UDRE 5 //USART DATA REGISTER EMPTY
#define FE 4 //FRAME ERROR
#define DOR 3 //DATA OVER RUN
#define PE 2 //PARITY ERROR
//UCSRB
#define RXCIE 7
#define TXCIE 6
#define UDRIE 5
#define RXEN 4
#define TXEN 3
#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<PE)
#define DATA_OVERRUN (1<<DOR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)
// USART Receiver buffer
#define RX_BUFFER_SIZE 128
char rx_buffer[RX_BUFFER_SIZE];
#if RX_BUFFER_SIZE<256
unsigned char rx_wr_index,rx_rd_index,rx_counter;
#else
unsigned int rx_wr_index,rx_rd_index,rx_counter;
#endif
// This flag is set on USART Receiver buffer overflow
bit rx_buffer_overflow;
// USART Receiver interrupt service routine
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_wr_index]=data;
if (++rx_wr_index == RX_BUFFER_SIZE) rx_wr_index=0;
if (++rx_counter >(RX_BUFFER_SIZE-32))
{
rx_counter=0;
rx_buffer_overflow=1;
// UCSRB&=~(1<<RXEN);
};
};
}
#ifndef _DEBUG_TERMINAL_IO_
// Get a character from the USART Receiver buffer
#define _ALTERNATE_GETCHAR_
#pragma used+
char getchar(void)
{
char data;
while (rx_counter==0);
data=rx_buffer[rx_rd_index];
if (++rx_rd_index == RX_BUFFER_SIZE) rx_rd_index=0;
#asm("cli")
--rx_counter;
#asm("sei")
return data;
}
#pragma used-
#endif
// USART Transmitter buffer
#define TX_BUFFER_SIZE 128
char tx_buffer[TX_BUFFER_SIZE];
#if TX_BUFFER_SIZE<256
unsigned char tx_wr_index,tx_rd_index,tx_counter;
#else
unsigned int tx_wr_index,tx_rd_index,tx_counter;
#endif
// USART Transmitter interrupt service routine
interrupt [USART_TXC] void usart_tx_isr(void)
{
if (tx_counter)
{
--tx_counter;
UDR=tx_buffer[tx_rd_index];
if (++tx_rd_index == TX_BUFFER_SIZE) tx_rd_index=0;
};
}
#ifndef _DEBUG_TERMINAL_IO_
// Write a character to the USART Transmitter buffer
#define _ALTERNATE_PUTCHAR_
#pragma used+
void putchar(char c)
{
while (tx_counter == TX_BUFFER_SIZE);
#asm("cli")
if (tx_counter || ((UCSRA & DATA_REGISTER_EMPTY)==0))
{
tx_buffer[tx_wr_index]=c;
if (++tx_wr_index == TX_BUFFER_SIZE) tx_wr_index=0;
++tx_counter;
}
else
UDR=c;
#asm("sei")
}
#pragma used-
#endif
// Standard Input/Output functions
#include <stdio.h>
unsigned char ascii;
void main(void)
{
PORTA=0x00;
DDRA=0xFF;
PORTB=0x00;
DDRB=0xFF;
PORTC=0x00;
DDRC=0x00;
PORTD=0x80;
DDRD=0x80;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud rate: 9600
UCSRA=0x00;
UCSRB=0xD8;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x47;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
// Global enable interrupts
#asm("sei")
buzzer(4);
while (1)
{
// Place your code here
ascii=getchar();
if(ascii!=0)
{
putchar(ascii);
}
};
} |
阿莫论坛20周年了!感谢大家的支持与爱护!!
一只鸟敢站在脆弱的枝条上歇脚,它依仗的不是枝条不会断,而是自己有翅膀,会飞。
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