modem_process

#include <net_config.h>

BOOL modem_process (
    U8 ch );    /* New character sent by the modem. */

The modem_process function processes characters that the local modem sends to the TCPnet system. The function stores each character in a buffer and checks the buffer for a valid modem response. The argument ch is the new character that is available from the modem.

The modem_process function for the null modem is in the RL-TCPnet library. The prototype is defined in net_config.h. If you want to use a standard modem connection, you must copy std_modem.c into your project directory.

note

• TCPnet calls modem_process when a new character is available from the local modem when TCPnet is in modem command mode.
• TCPnet is in modem command mode when it is in the process of instructing the local modem to dial, listen, or disconnect (hangup) from the remote modem.
• The modem driver functions must not use waiting loops because loops block the TCPnet system.

The modem_process function returns __TRUE when it receives the response "CONNECT" from the local modem. This means that the local modem has connected to the remote modem. Otherwise, it returns __FALSE.

modem_online, modem_run

BOOL modem_process (U8 ch) {
  /* Modem character process event handler. This function is called when */
  /* a new character has been received from the modem in command mode    */

  if (modem_st == MODEM_IDLE) {
    mlen = 0;
    return (__FALSE);
  }
  if (mlen < sizeof(mbuf)) {
    mbuf[mlen++] = ch;
  }
  /* Modem driver is processing a command */
  if (wait_for) {
    /* 'modem_run()' is waiting for modem reply */
    if (str_scomp (mbuf,reply) == __TRUE) {
      wait_for = 0;
      delay    = 0;
      if (wait_conn) {
        /* OK, we are online here. */
        wait_conn = 0;
        modem_st  = MODEM_ONLINE;
        /* Inform the parent process we are online now. */
        return (__TRUE);
      }
    }
  }
  /* Watch the modem disconnect because we do not use CD line */
  if (mem_comp (mbuf,"NO CARRIER",10) == __TRUE) {
    set_mode ();
  }
  if (ch == '\r' || ch == '\n') {
    flush_buf ();
  }
  /* Modem not connected, return FALSE */
  return (__FALSE);
}