/*------------------------------------------------
波特率自适应技术在DSP5402上的应用之C++接收程序
菜农 HotPower@126.com
2005.6.30 23:30 于西安大雁塔村队部
菜地: http://hotpower.21ic.org
------------------------------------------------*/
#include //C语言可以用stdio.h
#include //C语言可以用string.h
#include "C5402DEF.h"//DSP菜鸟HotPower创建
#include "class.h"
#define ccsdebug 1//1--IO模拟SPI; 0--硬件McBSP模块
extern "C" interrupt void Timer0Isr();//注意加extern "C"
extern "C" interrupt void Timer1Isr();
extern "C" interrupt void Eint0Isr();
extern "C" interrupt void Eint1Isr();
extern "C" interrupt void Eint2Isr();
extern "C" interrupt void Eint3Isr();
SystemObj::SystemObj(void)
{
Disable();//关中断
SREG->IMR = 0x0000;//
SREG->IFR = 0xffff;//清除
//设置0x0080为中断向量表首址，在第2个128页内。
SREG->PMST = (0x01 << PMST_IPTR) | (1 << PMST_MP_MC) | (1 << PMST_OVLY);
// SREG->PMST |= (1 << PMST_DROM);//数据可const.
/*---------------------------------------------------------------------------
若：设置0x0100为中断向量表首址，在第3个128页内。
则：*.cmd文件应该改为：
PAGE 0: VECS: origin="0x0100", length="0x66"
则：
SREG->PMST = (0x02 << PMST_IPTR) | (1 << PMST_MP_MC) | (1 << PMST_OVLY);
----------------------------------------------------------------------------*/
SystemInit();//系统初始化
}
void SystemObj::SystemInit(void)
{
PllInit();//PLL初始化
TIMER0Init();
TIMER1Init();
EintInit();
/*--------------------------------------------------------
注意以下2个变量的作用域的不同
--------------------------------------------------------*/
if (::SystemRamTest != 0x55aa) {//全局变量SystemRamTest
::SystemRamTest = 0x55aa;//改写全局变量
}
if (SystemRamTest != 0x55aa) {//类成员变量SystemRamTest
SystemRamTest = 0x55aa;//改写类成员变量
}
::IOXF = 0;
}
void SystemObj::PllInit(void)
{
volatile unsigned int start;
SREG->SWWSR = 0x2000;
do {
SREG->CLKMD = 0;
__nop();
}
while(SREG->CLKMD & (1 << CLKMD_PLLSTATUS));
// SREG->CLKMD = (0 << CLKMD_PLLMUL) | (30 << CLKMD_PLLCOUNT) | (1 << CLKMD_PLLONOFF) | (1 << CLKMD_PLLNDIV) | (1 << CLKMD_PLLSTATUS);//10M
SREG->CLKMD = (9 << CLKMD_PLLMUL) | (30 << CLKMD_PLLCOUNT) | (1 << CLKMD_PLLONOFF) | (1 << CLKMD_PLLNDIV) | (1 << CLKMD_PLLSTATUS);//100M
// SREG->CLKMD = (14 << CLKMD_PLLMUL) | (30 << CLKMD_PLLCOUNT) | (1 << CLKMD_PLLONOFF) | (1 << CLKMD_PLLNDIV) | (1 << CLKMD_PLLSTATUS);//150M
for (start = 0; start < 10000; start ++);//等待外设上电复位正常结束
}
void SystemObj::TIMER0Init(void)
{
TIMER0->TCR = (1 << TCR_TSS);//关闭定时器0
TIMER0->PRD = 60000;//设置定时周期
TIMER0->TIM = 60000;//设置定时计数器
TIMER0->TCR &= ~(1 << TCR_TSS);//启动定时器0
SREG->IMR |= (1 << IMR_TINT0);//允许TINT0中断
}
void SystemObj::TIMER1Init(void)
{
TIMER1->TCR = (1 << TCR_TSS);//关闭定时器1
TIMER1->PRD = 0xffff;//设置定时周期
TIMER1->TIM = 0xffff;//设置定时计数器
// TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
// SREG->IMR |= (1 << IMR_TINT1);//允许TINT1中断
}
void SystemObj::EintInit(void)
{
SREG->IMR |= (1 << IMR_INT0);//允许INT0中断
SREG->IMR |= (1 << IMR_INT1);//允许INT1中断
SREG->IMR |= (1 << IMR_INT2);//允许INT2中断
SREG->IMR |= (1 << IMR_INT3);//允许INT3中断
}
LcdObj::LcdObj(void)
{
LcdInit();
}
void LcdObj::LcdSpiSetup(void)
{
#if (ccsdebug == 0)
/*-----------------------------------------------------------
硬件McBSP模块配置为SPI接口
实验目的：
演练硬件McBSP模块配置为SPI接口的应用。
------------------------------------------------------------*/
McBSP1->SPSA = SPCR1;
McBSP1->SPSD = 0;
// McBSP1->SPSD &= ~(1 << SPCR1_RRST);//禁止串口接收
_delay_loop_(1);//延时等待
McBSP1->SPSA = SPCR2;
McBSP1->SPSD = 0;
// McBSP1->SPSD &= ~(1 << SPCR2_XRST);//禁止串口发送
_delay_loop_(1);//延时等待
McBSP1->SPSA = SPCR1;
McBSP1->SPSD = (0x02 << SPCR1_CLKSTP);//CLKSTP=10b
_delay_loop_(1);//延时等待
McBSP1->SPSA = PCR;
McBSP1->SPSD = (1 << PCR_FSXM) //设置FSX引脚为输出，控制LCD12864的片选信号SS
| (0 << PCR_FSXP) //FSX引脚平时输出低电平(LCD12864的片选信号SS无效)
| (1 << PCR_CLKXM) //设置CLKX引脚为输出
| (1 << PCR_CLKXP);//CLKXP引脚平时输出高电平
_delay_loop_(1);//延时等待
McBSP1->SPSA = SRGR1;
McBSP1->SPSD = (0x07 << SRGR1_FWID) //0x00~0x07~0xff
| (0x80 << SRGR1_CLKGDV);//速率0x80
_delay_loop_(1);//延时等待
McBSP1->SPSA = SRGR2;
McBSP1->SPSD = (1 << SRGR2_CLKSM);//
_delay_loop_(1);//延时等待
McBSP1->SPSA = RCR1;
McBSP1->SPSD = (0x00 << RCR1_RFRLEN1);//8BIT
_delay_loop_(1);//延时等待
McBSP1->SPSA = XCR1;//延时等待
McBSP1->SPSD = (0x00 << XCR1_RFRLEN1);//8BIT
_delay_loop_(1);//延时等待
McBSP1->SPSA = RCR2;
McBSP1->SPSD = (0x02 << RCR2_RDATDLY);//0x01
_delay_loop_(1);//延时等待
McBSP1->SPSA = XCR2;
McBSP1->SPSD = (0x02 << XCR2_RDATDLY);//0x01
_delay_loop_(1);//延时等待
McBSP1->SPSA = SPCR2;
McBSP1->SPSD |= (1 << SPCR2_GRST) | (1 << SPCR2_XRST) | (1 << SPCR2_FRST);
_delay_loop_(1);//延时等待
#else
/*-----------------------------------------------------------
硬件McBSP模块配置为普通IO软件模拟SPI时序
实验目的：
演练硬件McBSP模块配置为普通IO的应用.以备IO紧缺时急用。
------------------------------------------------------------*/
McBSP1->SPSA = SPCR1;
McBSP1->SPSD = 0;
McBSP1->SPSD &= ~(1 << SPCR1_RRST);//禁止串口接收
McBSP1->SPSA = SPCR2;
McBSP1->SPSD = 0;
McBSP1->SPSD &= ~(1 << SPCR2_XRST);//禁止串口发送
McBSP1->SPSA = PCR;
McBSP1->SPSD = (1 << PCR_XIOEN) | (1 << PCR_RIOEN);//设置收发为IO接口,DX输出,DR,CLKS输入
McBSP1->SPSD |= (1 << PCR_FSXM) | (1 << PCR_CLKXM);//设置FSX,CLKX可做IO输出
McBSP1->SPSD |= (1 << PCR_FSRM) | (1 << PCR_CLKRM);//设置FSR,CLKR可做IO输出
McBSP1->SPSD &= ~(1 << PCR_FSXP);//FSX信号=0
McBSP1->SPSD |= (1 << PCR_CLKXP);//CLKX信号=1
McBSP1->SPSD |= (1 << PCR_DX_STAT);//DX信号=1
#endif
}
void LcdObj::LcdInit(void)
{
_delay_loop_(1000);//延时等待
LcdSpiSetup();
/*---------------------------------------------------
LCD模块上电等待延时
----------------------------------------------------*/
_delay_loop_(1000);//延时等待
LcdClearBuffer();
LcdSendCommand(0x20);//发送4位控制命令
// LcdSendCommand(0x30);//发送8位控制命令//与8位4位无关!!!
LcdSendCommand(0x02);//发送位址归位命令，设定DDRAM位址计数器为0
LcdSendCommand(0x04);//发送进入点命令
LcdSendCommand(0x0c);//发送开显示关光标命令
LcdSendCommand(0x01);//发送清除显示命令
LcdSendCommand(0x80);//发送设定DDRAM地址0x00命令
//Keil C51汉字0xfd出错测试
// SetLcdDisplayPos(0, 0);//汉字定位到上行左端
// LcdDisplay("褒饼昌除待谍洱俘");
// LcdDisplay("1234567812345678");
// SetLcdDisplayPos(1, 0);//汉字定位到上行左端
// LcdDisplay("庚过糊积箭烬君魁");
// LcdDisplay("1234567812345678");
// SetLcdDisplayPos(2, 0);//汉字定位到上行左端
// LcdDisplay("例笼慢谬凝琵讫驱");
// LcdDisplay("1234567812345678");
SetLcdDisplayPos(3, 0);//汉字定位到上行左端
LcdDisplay("三升数她听妄锡淆");
// LcdDisplay("1234567812345678");
}
void LcdObj::LcdSend(unsigned char cData)
{
cData &= 0xff;
#if (ccsdebug == 0)
McBSP1->DXR1 = cData;//发送串行数据或命令
_delay_loop_(1);//延时等待
McBSP1->SPSA = SPCR2;
while((McBSP1->SPSD & (1 << SPCR2_XRDY)) == 0) {//等待发送结束
__nop();
__nop();
}
_delay_loop_(1);//延时等待
#else
unsigned int i;
McBSP1->SPSA = PCR;
for (i = 0; i < 8; i ++) {
McBSP1->SPSD &= ~(1 << PCR_CLKXP);//CLKX信号=0
_delay_loop_(1);//延时等待
if (cData & 0x80) {//MSB最高位为1时
McBSP1->SPSD |= (1 << PCR_DX_STAT);//DX信号=1
}
else {
McBSP1->SPSD &= ~(1 << PCR_DX_STAT);//DX信号=0
}
cData <<= 1;
_delay_loop_(1);//延时等待
McBSP1->SPSD |= (1 << PCR_CLKXP);//CLKX信号=1
_delay_loop_(1);//延时等待
}
McBSP1->SPSD |= (1 << PCR_DX_STAT);//DX信号=1
_delay_loop_(1);//延时等待
#endif
}
/*--------------------------------------------------------
发送8位LCD控制命令
--------------------------------------------------------*/
//__inline
void LcdObj::LcdSendCommand(unsigned char cCommand)
{
/*--------------------------------------------------------
发送同步脉冲11111 WR(0) RS(0) 0发送顺序从左至右）
--------------------------------------------------------*/
#if (ccsdebug == 1)
McBSP1->SPSD |= (1 << PCR_FSXP);//IO模拟控制FSX信号=1
_delay_loop_(1);//延时等待
#endif
LcdSend(0xf8);//发送LCD控制命令
LcdSend(cCommand & 0xf0);//发送高4位LCD控制命令
LcdSend((cCommand << 4) & 0xff);//发送低4位LCD控制命令
#if (ccsdebug == 1)
McBSP1->SPSD &= ~(1 << PCR_FSXP);//IO模拟控制FSX信号=0
#endif
if (cCommand == 0x01) _delay_loop_(160);//延时等待
else _delay_loop_(72);//st7920要求等待72uS
}
/*--------------------------------------------------------
发送8位LCD显示数据
--------------------------------------------------------*/
//__inline
void LcdObj::LcdSendData(unsigned char cData)
{
cData &= 0xff;
/*--------------------------------------------------------
发送同步脉冲11111 WR(0) RS(0) 0发送顺序从左至右）
--------------------------------------------------------*/
#if (ccsdebug == 1)
McBSP1->SPSD |= (1 << PCR_FSXP);//IO模拟控制FSX信号=1
_delay_loop_(1);//延时等待
#endif
LcdSend(0xfa);//发送LCD显示数据
LcdSend((cData & 0xf0) & 0xff);//发送高4位LCD显示数据
LcdSend((cData << 4) & 0xff);//发送低4位LCD显示数据
#if (ccsdebug == 1)
McBSP1->SPSD &= ~(1 << PCR_FSXP);//IO模拟控制FSX信号=0
#endif
_delay_loop_(72);//st7920要求等待延时72uS
}
//__inline
void LcdObj::SetLcdDisplayPos(unsigned int row, unsigned int col)
{
row &= 0x03;//LCD12864为4行汉字
col &= 0x0f;//每行8个汉字16个字符
LcdRow = row;
LcdCol = col;
LcdRowWriteEnable[row] = true;//允许此行刷新汉字显示
}
//__inline
void LcdObj::LcdClearBuffer(void)
{
unsigned int i, j;
for (i = 0;i < 4;i ++) {
for (j = 0;j < 16; j ++) {
LcdBuffer[j] = ' ';
}
LcdRowWriteEnable = true;//允许此行刷新汉字显示
}
LcdRow = 0;
LcdCol = 0;
}
//__inline
void LcdObj::LcdDisplayBuffer(void)
{
unsigned int i, j;
for (i = 0; i < 4; i ++) {//LCD12864为4行汉字
if (LcdRowWriteEnable) {//允许此行刷新汉字显示
LcdSendCommand(0x80 + (i & 1) * 16 + (i >> 1) * 8);//移动光标
_delay_loop_(1);//延时等待
for (j = 0; j < 16; j ++) {//每行8个汉字16个字符
LcdSendData(LcdBuffer[j]);//刷新显示字符
_delay_loop_(1);//延时等待
}
LcdRowWriteEnable = false;//过后不允许此行刷新汉字显示
_delay_loop_(1);//延时等待
}
}
}
//__inline
void LcdObj::LcdDisplay(const char * string)
{
while(*string) {
LcdBuffer[LcdRow][LcdCol ++] = (unsigned char)*string ++;
}
}
void LcdObj::LcdDisplay(unsigned char ch)
{
LcdBuffer[LcdRow][LcdCol ++] = ch;
if (LcdCol >= 16) {
LcdRow ++;//换行
LcdCol = 0;//回车
}
else {
LcdRowWriteEnable[LcdRow] = true;//允许此行刷新汉字显示
}
LcdCol &= 0x0f;
LcdRow &= 3;
}
void LcdObj::LcdDisplay(double val)
{
char string[17];
std::sprintf(string, "%5.2f", val);//注意std::
LcdDisplay(string);
}
void LcdObj::LcdDisplay(unsigned int val)
{
char string[17];
std::sprintf(string, "%04X", val);//注意std::
LcdDisplay(string);
}
void LcdObj::LcdDisplay(unsigned long val)
{
//char string[17];
LcdDisplay((unsigned int)(val >> 16));
LcdDisplay((unsigned int)(val & 0xffff));
// std::sprintf(string, "%08LX", (unsigned long)val);//注意std::
// LcdDisplay(string);
}
void LcdObj::LcdDisplay(unsigned char hexstr[], unsigned int len)
{
unsigned char ch;
for (int i = 0; i < len; i ++) {
ch = *hexstr++;
if (ch < 0xa0) {
LcdBuffer[LcdRow][LcdCol ++] = (ch >> 4) + '0';
}
else {
LcdBuffer[LcdRow][LcdCol ++] = (ch >> 4) - 10 + 'A';
}
if ((ch & 0x0f) < 0x0a) {
LcdBuffer[LcdRow][LcdCol ++] = (ch & 0x0f) + '0';
}
else {
LcdBuffer[LcdRow][LcdCol ++] = (ch & 0x0f) - 10 + 'A';
}
}
}
UartObj::UartObj(void)
{
UartInit();
}
void UartObj::UartInit(void)
{
Start = false;//还未进行自适应
Count = 0;
PRDREG = 0;
RxCount = 0;
Status = 0;
RWCount = 0;
RRCount = 0;
}
unsigned int UartObj::TestBio(void)
{
unsigned int PortBIO = 0;//BIO引脚为低电平
asm(" bc __TestBio__1,BIO");
PortBIO = 0x200;//BIO引脚为高电平
asm("__TestBio__1");
return PortBIO;
}
void UartObj::UartExec(void)
{
unsigned long timerH, timerL, timer;
if (!Start) {//波特率测试
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
TIMER1->TIM = TIMER1->PRD;
TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
SREG->IFR = (1 << IFR_TINT1);//清除TINT1中断标志
while(!(SREG->IFR & (1 << IFR_TINT1))) {
if (TestBio()) {//等待BIO上跳
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
PRDREG = TIMER1->PRD - TIMER1->TIM;//存时间基准
timer = (unsigned long)(PRDREG);
TIMER1->TIM = TIMER1->PRD;//0xffff
TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
SREG->IFR = (1 << IFR_TINT1);//清除TINT1中断标志
timerH =0L;
while(TestBio()) {
if (SREG->IFR & (1 << IFR_TINT1)) {
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
timerH += 0xffff;
TIMER1->TIM = TIMER1->PRD;
TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
SREG->IFR = (1 << IFR_TINT1);//清除TINT1中断标志
if (timerH >= (6 * timer + (6 * timer * 3 / 100))) return;//高电平太宽(6.5)
}
}
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
timerH += TIMER1->PRD - TIMER1->TIM;
TIMER1->TIM = TIMER1->PRD;//0xffff
TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
if (timerH >= (6 * timer + (6 * timer * 3 / 100))) return;//高电平太宽(6.5)
if (timerH <= (6 * timer - (6 * timer * 3 / 100))) return;//高电平太宽(5.5)
timerL = 0;
while(!TestBio()) {
if (SREG->IFR & (1 << IFR_TINT1)) {
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
timerL += 0xffff;
TIMER1->TIM = TIMER1->PRD;
TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
SREG->IFR = (1 << IFR_TINT1);//清除TINT1中断标志
if (timerL >= (2 * timer + (2 * timer * 3 / 100))) return;//高电平太宽(2.5)
}
}
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
timerL += TIMER1->PRD - TIMER1->TIM;
TIMER1->TIM = TIMER1->PRD;//0xffff
TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
if (timerL >= (2 * timer + (2 * timer * 3 / 100))) return;//高电平太宽(2.5)
if (timerL <= (2 * timer - (2 * timer * 3 / 100))) return;//高电平太宽(1.5)
TIMER1->PRD = timerH / 6;
Count = 0;
Status = 0;
RxCount = 0;
RWCount = 0;
RRCount = 0;
Start = true;
}
}
}
else {
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
TIMER1->TIM = TIMER1->PRD / 2;//起始位为1/2，其它位为1/1
TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1
SREG->IFR = (1 << IFR_TINT1);//清除TINT1中断标志
SREG->IMR &= ~(1 << IMR_INT0);//禁止INT0中断
SREG->IMR |= (1 << IMR_TINT1);//允许TINT1中断
Status |= ((unsigned int)1 << Uart_BUSY);
Count = 0;//从起始位开始
}
}
void UartObj::UartRecExec(void)
{
Count ++;//接收到1位起始位或数据或停止位，计数进行节拍管理。
DDRX >>= 1;//右移串行数据位
DDRX |= TestBio();//取串口接收数据位
if (Count >= (8 + 2)) {//串口数据位最后位停止位
if (((DDRX & (1 << BIT0)) == 0) && (DDRX & (1 << BIT9))) {//接收够8位数据
DDR = (DDRX >> 1) & 0xff;//去除起始位和终止位后截取8位数据
RxBuff[RWCount] = DDR;//写入接收FIFO.
RWCount ++;//指向下1位数据
RWCount &= 0x3f;//64个字节
RxCount ++;//接收字节个数计数
if (RxCount > 64) {
Status |= (1 << Uart_OE);//数据溢出，覆盖了FIFO
}
else {
Status &= ~(1 << Uart_OE);//数据未溢出
}
Status |= (1 << Uart_RDR);//FIFO里有数据
}
TIMER1->TCR |= (1 << TCR_TSS);//关闭定时器1
SREG->IMR &= ~(1 << IMR_TINT1);//禁止TINT1中断
SREG->IMR |= (1 << IMR_INT0);//允许INT0中断
SREG->IFR = (1 << IFR_INT0);//清除INT0中断标志
Status &= ~(1 << Uart_BUSY);//串口闲
}
}
unsigned char UartObj::Getchar(void)
{
unsigned char ch;
while (!(Uart.Status & (1 << Uart_RDR)));//等待接收缓冲区有数据
Disable();//关中断
ch = RxBuff[RRCount];//取串口数据
RRCount ++;//指向下1位数据
RRCount &= 0x3f;//64个字节
RxCount --;
if (RxCount == 0) {
Uart.Status &= ~(1 << Uart_RDR);//FIFO里已无数据
}
Enable();//开中断
return ch;//返回接收数据
}
int main(void)
{
unsigned char ch;
Enable();//开中断
Lcd.SetLcdDisplayPos(0, 0);
while(1)
{
if (::IOXF) {
SREG->ST1 |= (1 << ST1_XF);
}
else {
SREG->ST1 &= ~(1 << ST1_XF);
}
// idle();
ch = Uart.Getchar();
if (ch >= ' ') {
Lcd.LcdDisplay(ch);
}
}
}
interrupt void Timer0Isr() {
static int count = 0;
static unsigned int ledcount = 0;
//char str[17];
count ++;
if (count >= 500) {
count = 0;
// Lcd.SetLcdDisplayPos(0, 0);
// std::sprintf(str, "ledcount=%04X ", ledcount >> 2);//注意std::
// Lcd.LcdDisplay("ledcount=");
// Lcd.LcdDisplay(ledcount >> 2);
Lcd.LcdDisplayBuffer();//刷新LCD显示缓冲区
/*
Lcd.SetLcdDisplayPos(3, 0);
if ((ledcount & 0x03) == 0) {
Lcd.LcdDisplay("12345678");
Lcd.SetLcdDisplayPos(3, 8);
Lcd.LcdDisplay("我晕倒了");
}
else {
Lcd.LcdDisplay("你在倒塌");
Lcd.SetLcdDisplayPos(3, 8);
Lcd.LcdDisplay("87654321");
}
*/
::IOXF = !::IOXF;//郁闷~~~中断中ST1被保护~~~
ledcount ++;
}
}
interrupt void Timer1Isr() {//串口Uart的软时?
Uart.UartRecExec();
SREG->IFR = (1 << IFR_TINT1);//清除TINT1中断标志
}
interrupt void Eint0Isr() {
Uart.UartExec();
SREG->IFR = (1 << IFR_INT0);//清除INT0中断标志
}
interrupt void Eint1Isr() {
// Lcd.SetLcdDisplayPos(2, 0);
// Lcd.LcdDisplay("欢迎INT1中断观光");
SREG->IFR = (1 << IFR_INT1);//清除INT1中断标志
}
interrupt void Eint2Isr() {
// Lcd.SetLcdDisplayPos(2, 0);
// Lcd.LcdDisplay("欢迎INT2中断观光");
SREG->IFR = (1 << IFR_INT2);//清除INT2中断标志
}
interrupt void Eint3Isr() {
// Lcd.SetLcdDisplayPos(2, 0);
// Lcd.LcdDisplay("欢迎INT3中断观光");
SREG->IFR = (1 << IFR_INT3);//清除INT3中断标志
}
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