AVR中断问题？？？？？。。。

xmmant 2007-1-31 21:27 楼主

我这里有一个小小的程序，调试时，只要已打开全局中断（提示：之前有开串口中断），打印信息就打印不全，而且会重复执行main()函数，由于我是初次接触AVR的，现在实在是找不到是怎么回事，所以我把我这个小程序发到网上，请各位帮忙看看！麻烦大家，在此先谢谢了！

// Filename: Serial.h
#ifndef __SERIAL_H
#define __SERIAL_H

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

void SerialTxChar(int8_t data);
void SerialTxString(int8_t *s);

#define putch SerialTxChar
#define putchar putch
#define puts SerialTxString
void SerialInit(void);
void Dprintf(int8_t *f, ...);

#endif

// Filename: Serial.c
#include
#include
#include "serial.h"

#define MCLK 3686400
#define BAUDRATE    115200

void set_baudrate(void)
{
uint16_t scaler = MCLK/16/BAUDRATE - 1; // default baud = 115200
UBRR1H = scaler >> 8;
UBRR1L = scaler;
}
void SerialInit(void)
{
UCSR1C = 0x06;
UCSR1A = 0x00;
set_baudrate();
UCSR1B = 0xD8;
}

void SerialTxChar(int8_t data)
{
if(data=='\n') {
while(!(UCSR1A & (1< UDR1='\r';
}
while(!(UCSR1A & (1< UDR1=data;
}

void SerialTxString(int8_t *s)
{
   while(*s)
SerialTxChar(*s++);
}

int16_t strlen(const int8_t *s)
{
int16_t i = 0;

for(; *s; s++)
i++;

return i;
}

/*---------------------printf and support routines ---------------------*/
/* print c count times */
void PutRepChar(int8_t c, int16_t count)
{
while (count--) putch(c);
}

/* put string reverse */
void PutStringReverse(int8_t *s, int16_t index)
{
  while ((index--) > 0) putch(s[index]);
}

/*-------------------------------------------------------------------------*/
/*
prints value in radix, in a field width width, with fill
character fill
if radix is negative, print as signed quantity
if width is negative, left justify
if width is 0, use whatever is needed
if fill is 0, use ' '
*/

static void PutNumber(int16_t value, int16_t radix, int16_t width, int8_t fill)
{
  int8_t buffer[40];
  int16_t bi = 0;
  uint16_t    uvalue;
  int16_t digit;
  int16_t left = FALSE;
  int16_t negative = FALSE;

  if (fill == 0) fill = ' ';

  if (width < 0) {
width = -width;
left = TRUE;
  }
  if (width < 0 || width > 80) width = 0;

  if (radix < 0) {
radix = -radix;
if (value < 0) {
   negative = TRUE;
   value = -value;
}
  }
  uvalue = value;
  do {
if (radix != 16) {
   digit = uvalue % radix ;
   uvalue = uvalue / radix ;
}
else {
   digit = uvalue & 0xf;
   uvalue = uvalue >> 4;
}
buffer[bi] = digit + ((digit <= 9) ? '0' : ('A' - 10));
bi++;

if (uvalue != 0) {
   if ((radix==10)&&((bi==3)||(bi==7)||(bi==11)|(bi==15))) {
buffer[bi++]=',';
   }
}
  } while (uvalue != 0);

  if (negative) {
buffer[bi] = '-';
bi += 1;
  }
  if (width <= bi) PutStringReverse(buffer, bi);
  else {
width -= bi;
if (!left) PutRepChar(fill, width);
PutStringReverse(buffer, bi);
if (left) PutRepChar(fill, width);
  }
}

/*-------------------------------------------------------------------------*/
static int8_t *FormatItem(int8_t *f, int16_t a)
{
  int8_t c;
  int16_t fieldwidth = 0;
  int16_t leftjust = FALSE;
  int16_t radix = 0;
  int8_t fill = ' ';

  if (*f == '0') fill = '0';
  while ((c = *f++)!=0) {
if (c >= '0' && c <= '9') {
   fieldwidth = (fieldwidth * 10) + (c - '0');
}
else switch (c) {
case '\000': return(--f);
case '%': putch('%');
   return(f);
case '-': leftjust = TRUE;
   break;
case 'c': {
   if (leftjust) putch(a & 0x7f);
   if (fieldwidth > 0) PutRepChar(fill, fieldwidth - 1);
   if (!leftjust) putch(a & 0x7f);
   return(f);
}
case 's': {
   if (leftjust) puts((int8_t *) a);
   if (fieldwidth > strlen((int8_t *) a))
PutRepChar(fill, fieldwidth - strlen((int8_t *)a));
   if (!leftjust) puts((int8_t *) a);
   return(f);
}
case 'd':
case 'i': radix = -10;break;
case 'u': radix = 10;break;
case 'x': radix = 16;break;
case 'X': radix = 16;break;
case 'o': radix = 8;break;
default : radix = 3;break; // unknown switch!
}
if (radix) break;
  }
  if (leftjust) fieldwidth = -fieldwidth;
  PutNumber(a, radix, fieldwidth, fill);
  return(f);
}

#define vaStart(list, param) list = (int8_t*)((int16_t)¶m + sizeof(param))
#define vaArg(list, type) ((type *)(list += sizeof(type)))[-1]
#define vaEnd(list)

void Dprintf(int8_t *f, ...)    // variable arguments
{
int8_t *argP;

vaStart(argP,f); // point at the end of the format string
while (*f) { // this works because args are all ints
if (*f == '%')
f = FormatItem(f + 1, vaArg(argP, int16_t));
else
putch(*f++);
}
vaEnd(argP);
}

int16_t main()
{
int16_t temp1,temp2,sum,product,divide,minus,i;
int8_t  *string1;
temp1=1024;
temp2=4;
string1="Hello,I'll come to here!";

asm("CLI");
asm("wdr");
SerialInit();
asm("wdr");
//asm("SEI");

Dprintf("%s\n",string1);
Dprintf("%d\n",temp1);
Dprintf("%x\n",temp1);

sum=temp1+temp2; //result as dec=1028,hex=0x404
Dprintf("sum(decimal)%d",sum);
Dprintf("sum(hex)=0x%x\n\n",sum);

product=temp1*temp2; //result as dec=4096,hex=0x1000
Dprintf("\nproduct(decimal)=%d\n",product);
Dprintf("product(hex)=0x%x\n\n",product);

divide=temp1/temp2; //result as dec=256,hex=0x100
Dprintf("\ndivide(decimal)=%d\n",divide);
Dprintf("divide(hex)=0x%x\n\n",divide);

minus=temp1-temp2; //result as dec=1020,hex=0x3FC
Dprintf("\nminus(decimal)=%d\n",minus);
Dprintf("minus(hex)=0x%x\n\n",minus);

while(1)
{
asm("wdr");
}

return (0);
}

AVR中断问题？？？？？。。。

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AVR中断问题？？？？？。。。

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