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Software Buffer for UART, problem

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Guest

Software Buffer for UART, problem

Posted: Mon Apr 14, 2008 10:15 am

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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

Posted: 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


Posted: Tue Apr 15, 2008 5:07 am

Look here... ganssle.com/tem/tem110.pdf

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