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Software Buffer for UART, problem

 
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Software Buffer for UART, problem
PostPosted: Mon Apr 14, 2008 10:15 am     Reply with quote
Hi

I use a software UART, this part is working.

I want to imp. a buffer of 10 char, but I have lot of problem to get it work.

Some code...

Code:

#define com_buffer_max 10   //set buffer length
#define com_buffer_clear 255 //define empty buffer data

struct _com_buffer{
           int buffer[com_buffer_max+2];
           int rbcnt; //counter to read from buffer
           int wbcnt; //counter to write from buffer
           int1 ok;       //buffer data is ok
}com_buffer;

//**data to the buffer**//
void com_buffer_w(int c){
  com_buffer.buffer[com_buffer.wbcnt++] =c;
 
  if (com_buffer.wbcnt > com_buffer_max) com_buffer.wbcnt=0;
 
}

//**read one char from the buffer, the buffer pointer move one step forward**//
int com_buffer_r(void){
 int c;
 
 if (com_buffer.buffer[com_buffer.rbcnt] != com_buffer_clear){
  c=com_buffer.buffer[com_buffer.rbcnt];
  com_buffer.buffer[com_buffer.rbcnt]=com_buffer_clear;
  com_buffer.rbcnt++;
  if (com_buffer.rbcnt > com_buffer_max) com_buffer.rbcnt=0;
  com_buffer.ok=1;
 }
 else{
  com_buffer.ok =0;
  c=com_buffer_clear;
 }
 return c;
}



Init buffer before use:
Code:
//init com buffer.
void com_buffer_init(void){
 int i;
 for (i=0; i<=com_buffer_max; i++) com_buffer.buffer[i]=com_buffer_clear;
 com_buffer.wbcnt=0;
 com_buffer.rbcnt=0;
 com_buffer.ok =0;
}



Write to the buffer:
Code:
com_buffer_w(i);


Read the buffer:
Code:
data = com_buffer_r();
  if (com_buffer_kbhit()){
....
}



Any sugest, or maybe some ex. of working buffer.

/F
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Apr 14, 2008 10:53 am     Reply with quote
Look at the sample code in Ex_Sisr.c
Quote:
c:\program files\picc\examples\ex_sisr.c
Guest
PostPosted: Tue Apr 15, 2008 5:07 am     Reply with quote
Look here...
ganssle.com/tem/tem110.pdf
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