#include <RTL.h>
#include <rl_usb.h>

void usbd_vcom_chkserstate (void);

The function usbd_vcom_chkserstate checks the state of the serial communication port.

The function usbd_vcom_chkserstate is part of the USB Device Function Driver layer of the RL-USB Device Software Stack.

It is not required to modify this function.

None.

usbd_cdc_init, usbd_cdc_ser_availchar, usbd_cdc_ser_closeport, usbd_cdc_ser_initport, usbd_cdc_ser_linestate, usbd_cdc_ser_openport, usbd_cdc_ser_read, usbd_cdc_ser_write, usbd_vcom_serial2usb, usbd_vcom_usb2serial

#include <RTL.h>
#include <rl_usb.h>

int main (void) {

  usbd_init ();               // USB Device Initialize
  usbd_connect (__TRUE);      // USB Device Connect

  while (1) {                 // Loop forever
    ..
    usbd_vcom_serial2usb();   // Send data from serial COM port to USB CDC Device
    usbd_vcom_chkserstate();  // Check serial connection
    usbd_vcom_usb2serial();   // Send data from USB CDC Device to serial COM port
    ..
  }
}