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kbhit() and stream inquiry

 
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chingB



Joined: 29 Dec 2003
Posts: 81

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kbhit() and stream inquiry
PostPosted: Thu Jan 15, 2004 2:54 am     Reply with quote
Hi

I plan to use a hardware interrupt uart for receiving data from a computer. I search this community for a code snippet in using #int_rda and I gain few tips in using interrupt service routine.

My concern is: would it be possible to use kbhit(Com1) and circular buffer method for receiving incoming packets from the computer.

Code:

#define RX_SIZE 64     
byte rxbuffer[RX_SIZE];
byte rx_in  = 0;           
byte rx_out = 0;           

#int-rda
void serial_rx()
{
     int t;

     if (kbhit(COM1))
     {
           t = fgetc(COM1);
           rxbuffer[rx_in] = t;
           rxchksm ^= t;
           
           rx_in = (rx_in+1) % RX_SIZE;
           .........
           .........
      }
}



Need you comments on this....

Thank u.
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Thu Jan 15, 2004 5:39 am     Reply with quote
Quote:

My concern is: would it be possible to use kbhit(Com1) and circular buffer method for receiving incoming packets from the computer.


Yes of course. There aren't any connection between them.
kbhit() returns TRUE if the start bit of a character is being received on the RS232 RCV pin.
circular buffer is a way to store incoming bytes in memory.

regards,

Humberto
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

View user's profile Send private message

PostPosted: Thu Jan 15, 2004 6:02 am     Reply with quote
Quote:

My concern is: would it be possible to use kbhit(Com1) and circular buffer method for receiving incoming packets from the computer.


Yes of course. There aren't any connection between them.
kbhit() returns TRUE if the start bit of a character is being received on the RS232 RCV pin.
circular buffer is a way to store incoming bytes in memory.

regards,

Humberto
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