UART flow control with WP7608

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To set RI pin as input pin:

  1. you need to first send an AT command: AT!RIOWNER=1
  2. after that you can control the RI in linux console:
    echo RI > /sys/class/gpio/export
    echo in > /sys/class/gpio/gpioRI/direction
    cat /sys/class/gpio/gpioRI/value

In addition, I found that you can read the RTS pin status by AT command:
AT!entercnd=“A710”
AT!bsgpio?6

For setting the CTS pin, you can use ioctl():

	 int arg;
	 if (ioctl(fd1, TIOCMGET, &arg) == -1)
	 {
	 	LE_DEBUG("ERROR: %s", strerror(errno));
	 }

	 if (level)
		  arg |= TIOCM_RTS;
	   else
	   	  arg &= ~TIOCM_RTS;

	  if (ioctl(fd1, TIOCMSET, &arg) == -1) {
	    		LE_DEBUG("ERROR: %s", strerror(errno));
	      }