/*****************************************************
Getting Started Guide for Arty-Z7-20

This demo displays the status of the buttons on the
LEDs and prints a message to the serial communication
when a switch is on.

Terminal Settings:
   -Baud: 115200
   -Data bits: 8
   -Parity: no
   -Stop bits: 1

9/21/17: Created by JPEYRON
****************************************************/

#include <stdio.h>
#include "platform.h"
#include <xgpio.h>
#include "xparameters.h"
#include "sleep.h"

int main()
{
   XGpio input, output;
   int button_data = 0;
   int switch_data = 0;

   XGpio_Initialize(&input, XPAR_AXI_GPIO_0_DEVICE_ID);	//initialize input XGpio variable
   XGpio_Initialize(&output, XPAR_AXI_GPIO_1_DEVICE_ID);	//initialize output XGpio variable

   XGpio_SetDataDirection(&input, 1, 0xF);			//set first channel tristate buffer to input
   XGpio_SetDataDirection(&input, 2, 0xF);			//set second channel tristate buffer to input

   XGpio_SetDataDirection(&output, 1, 0x0);		//set first channel tristate buffer to output

   init_platform();

   while(1){
      button_data = XGpio_DiscreteRead(&input, 1);	//get switch data

      XGpio_DiscreteWrite(&output, 1, button_data);	//write switch data to the LEDs

      switch_data = XGpio_DiscreteRead(&input, 2);	//get button data

      //print message dependent on whether one or more buttons are pressed
      if(switch_data == 0b00){} //do nothing

      else if(switch_data == 0b01)
         xil_printf("switch 0 on\n\r");

      else if(switch_data == 0b10)
         xil_printf("switch 1 on\n\r");

      else
         xil_printf("both switches on\n\r");

      usleep(200000);			//delay

   }
   cleanup_platform();
   return 0;
}