com_getchar

#include <net_config.h>

int com_getchar (void);

The com_getchar function reads a character from the serial input buffer.

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

note

• Serial driver functions must not use waiting loops, because loops block the TCPnet system.
• You must provide the com_getchar function if the serial controller in use is different from the one provided in the TCPnet source.

• read character value = executed successfully
• -1 = input buffer is empty.

com_putchar, com_tx_active, init_serial

int com_getchar (void) {
  /* Read a byte from serial interface */
  struct buf_st *p = &rbuf;

  if (p->in == p->out) {
    /* Serial receive buffer is empty. */
    return (-1);
  }
  return (p->buf[p->out++]);
}