com_putchar

#include <net_config.h>

BOOL com_putchar (
    U8 c );    /* The character to write to the output buffer. */

The com_putchar function writes the character specified by the argument c to the serial output buffer and activates the serial transmission if it is not already active.

The com_putchar function is part of RL-TCPnet. The prototype is defined in net_config.h.

note

• The serial driver functions must not use waiting loops because loops block the TCPnet system.
• You must provide the com_putchar function if the serial controller you use is different from the ones provided in the TCPnet source.

BOOL com_putchar (U8 c)
{
   struct buf_st *p = &tbuf;

   /* Write a byte to serial interface */
   if ((U8)(p->in + 1) == p->out) {
      /* Serial transmit buffer is full. */
      return (__FALSE);
   }
   VICIntEnClr = (1 << 7);
   if (tx_active == __FALSE) {
      /* Send directly to UART. */
      U1THR = (U8)c;
      tx_active = __TRUE;
   }
   else {
      /* Add data to transmit buffer. */
      p->buf [p->in++] = c;
   }
   VICIntEnable |= (1 << 7);
   return (__TRUE);
}