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String fprintf and fputc (fputc works, printf does not)

 
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mtsoule



Joined: 19 Oct 2011
Posts: 31

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String fprintf and fputc (fputc works, printf does not)
PostPosted: Sun May 20, 2012 9:47 am     Reply with quote
ok, with this code my output is
Code:

{0{}}

I expect the output to be
Code:
{8{Settings}}


which tells me the length of my string is 0, however if I uncomment the fputc statement, I get the expected data.

I have, for simplicity, taken out all of the error checking and other non essential code.

Compiler version is 4.132

Code:

while(BT_inchar != '\n')
   {
   while(!BT_Inchar_Ready)
      {
      }
      BT_Inchar_Ready = 0;
      RX_Buffer[RX_ctr] = BT_inchar;
      RX_ctr++;
   //   fputc(BT_inchar,prog);
   }
      fprintf(prog,"{%i{%s}}",strlen(RX_buffer), RX_Buffer);


here is my isr
Code:


#int_RDA
void  RDA_isr(void)
{
BT_Inchar = getc(BT);
BT_Inchar_Ready = 1;
}
bkamen



Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA

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PostPosted: Sun May 20, 2012 5:47 pm     Reply with quote
Keep in mind using any string stuff in fprintf (or just printf) requires the string be NULL terminated.

Otherwise, the printf can run off into la-la land.

So when you get your string, before printing it, you need to make sure there's a zero at the end.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D
mtsoule



Joined: 19 Oct 2011
Posts: 31

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Got it!!
PostPosted: Mon May 21, 2012 4:39 am     Reply with quote
Thanks Ben, that was it! i ended up moving my "Buffer Filler" to the ISR (i hate putting it there) i like to go in to the ISR and get out. But i found it works best for my app.

Basically here is what i have now in the ISR
Code:

#int_RDA
void  RDA_isr(void)
{
BT_Inchar = getc(BT);

if((Packet == Packet_Count) && (BT_Inchar != '\r') && (BT_Inchar != '\n'))
   {
   RX_Buffer[RX_ctr] = BT_Inchar;
   RX_ctr++;
   RX_Buffer[RX_ctr] = 0x00;
   }

if(BT_Inchar == '\n')
   {
   BT_Inchar_Ready = 1;
   Packet_Count++;
   }


}


i do this so i can read a spific portion of the incomming stream, and i also want to throw away all the "LF's" and "CR's"
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