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Array pointer increment

 
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ysaacb



Joined: 12 Jun 2006
Posts: 19

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Array pointer increment
PostPosted: Mon Jun 12, 2006 1:57 pm     Reply with quote
Hi :

Why in this code the array index "next_in" increments automaticaly when there is an interrupt.

Why when I try to fill the arrays buffer and buffer_temp they got dferent data?



Code:
#int_rda
void rx_serial_data()
{
byte t;
char ch;

count +=1;
ch=getc();
buffer[next_in] =ch; // get the data(single character) from serial port
buffer_temp[next_in]=ch;
t=next_in;
if (buffer[next_in]=0x0A)
++count_lf;
if (count_lf=2)
end_message=true;
next_in=(next_in+1) % BUFFER_SIZE;
if(next_in==next_out)
next_in=t; // Buffer full !!
}



Sending a "AT" command to a GSM modem, this is what I got using the ICD2
Code:
   
   Address    Symbol Name Value Hex  Char

     0029    next_in      0x06 0x06      .
     0055    end_message  0x01           
     002B    BUFFER      ""           
     002B    [0]             . 0x0A      .
     002C    [1]             . 0x0A      .
     002D    [2]             . 0x0A      .
     002E    [3]             . 0x0A      .
     002F    [4]             . 0x0A      .
     0030    [5]             . 0x0A      .
     0031    [6]             . 0x00      .
     0032    [7]             . 0x00      .
     0033    [8]             . 0x00      .
     0034    [9]             . 0x00      .
     0035    [10]            . 0x00      .

     00A0    buffer_temp "OK"           
     00A0    [0]             . 0x0D      .
     00A1    [1]             . 0x0A      .
     00A2    [2]             O 0x4F      O
     00A3    [3]             K 0x4B      K
     00A4    [4]             . 0x0D      .
     00A5    [5]             . 0x0A      .
     00A6    [6]             . 0x00      .
     00A7    [7]             . 0x00      .
     00A8    [8]             . 0x00      .
     00A9    [9]             . 0x00      .
     00AA    [10]            . 0x00      .
   
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jun 12, 2006 2:13 pm     Reply with quote
At a minimum, the lines shown in bold below are wrong.
Quote:
#int_rda
void rx_serial_data()
{
byte t;
char ch;

count +=1;
ch=getc();
buffer[next_in] =ch; // get the data(single character) from serial port
buffer_temp[next_in]=ch;

t=next_in;

if (buffer[next_in]=0x0A)
++count_lf;

if (count_lf=2)
end_message=true;

next_in=(next_in+1) % BUFFER_SIZE;
if(next_in==next_out)
next_in=t; // Buffer full !!
}

Look at item #2 in the link below.
http://www.edm2.com/0504/12cerr.html
ysaacb



Joined: 12 Jun 2006
Posts: 19

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Thank you !!!
PostPosted: Wed Jun 14, 2006 6:13 am     Reply with quote
thank you
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