UART2 TX and RX for XBee fprintf, fopen, fclose

//iniitializes uart 2 for the XBEE
int initializeXbee() {
        //set pin 21 to uart 2 TX - output
        FILE* file = fopen("/sys/kernel/debug/omap_mux/spi0_d0", "w+");
        fprintf(file, "1");
        fclose(file);

        //set pin 22 to uart 2 RX - input
        file = fopen("/sys/kernel/debug/omap_mux/spi0_sclk", "w+");
        fprintf(file, "21");
        fclose(file);
        return 0;
}