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.

The com_putchar function returns __TRUE if it successfully wrote the character into the output buffer. Otherwise, for example if the buffer is full, it returns __FALSE.

com_getchar, com_tx_active, init_serial

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);
}