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Use timer interrupts to start transmitting interrupts

 
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cchappyboy



Joined: 03 Dec 2008
Posts: 45

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Use timer interrupts to start transmitting interrupts
PostPosted: Tue Jan 10, 2012 4:05 pm     Reply with quote
Is that possible to start a transmitting interrupts in a timer interrupt for sending out data once in certain time period.
Code:

#int_timer1
void time1_isr()
{
set_timer1(0xbf5);
enable_interrupts(int_tbe);
}

#int_tbe
void serial_isr() {
output_high(pin_a2);
if(t_next_in!=t_next_out)
   {
      putc(t_buffer[t_next_out]);
      t_next_out=(t_next_out+1) % T_BUFFER_SIZE;
   }
else
   disable_interrupts(int_tbe);
}

Thanks in advance for any help.
asmboy



Joined: 20 Nov 2007
Posts: 2128
Location: albany ny

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PostPosted: Tue Jan 10, 2012 5:05 pm     Reply with quote
ANSWER:
yes it should be possible
but ONE of your problems is it keep repeating in the timer isr
Code:


STATIC int1 TX_armed=0; // set this to '1' elsewhere in your program when you   
//have data you want to release on timer INT - this will enable it only
// ONCE and the send routine DISARMS the control flag when TX empty
// routine is done

#int_timer1
void time1_isr() {
    set_timer1(0xbf5);
    if (TX_ARMED){
        TX_ARMED=0;
        enable_interrupts(int_tbe);
     }
}
#int_tbe
void serial_isr() {
   output_high(pin_a2); // whatever
   if(t_next_in!=t_next_out)   {
       putc(t_buffer[t_next_out]);
       t_next_out++;   
       if(t_next_out==T_BUFFER_SIZE)  t_next_out=0;
    }
    else{
    tx_armed=0;
   disable_interrupts(int_tbe);
  }
}


i also cleaned up an inefficiency in the modulus % usage in the circular buffer.
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