# Xilinx project tutorial & program into flash

## Create a project make LED blinking
### 1. create a new project

Launch vivado 2016.4
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### 2. Create Block Design
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click "Run Block Automation"
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### 3. Add IP AXI GPIO
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Double click AXI GPIO
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Set it as an output pin
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Click "Run Connection Automation"
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Check all of the boxes
Set board part interface of GPIO to "custom"
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Create HDL wrapper

### 4. Assign output pin
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Copy the name of the output port
In this project, the name is "gpio_rtl_tri_o"
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Add design constraints
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Create a new file
Name the file
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Edit the constrain file
U14 is the pin name(LED) on the FPGA board

set_property IOSTANDARD LVCMOS33 [ get_ports {gpio_rtl_tri_o[0]} ]

set_property PACKAGE_PIN U14 [ get_ports {gpio_rtl_tri_o[0]} ]

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Generate bit stream
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Export hardware(include bitstream)
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Launch SDK
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### 5. SDK
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Create a new application project
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Right click "Board Support Package Settings"
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Edit the main file

#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
#include "xgpio.h"


void simple_delay (int simple_delay)
{
        volatile int i = 0;
        for (i = 0; i < simple_delay; i++);
}

int main()
{
    init_platform();
    XGpio led_gpio;              /* LED Instance */
    char led_value = 0x00;   /* default led_gpio value */


    /* Initialize LED GPIO settings */
    XGpio_Initialize(&led_gpio, XPAR_AXI_GPIO_0_DEVICE_ID);
    XGpio_SetDataDirection(&led_gpio, 1, 0);

    print("Start to blink led_gpio !!!\n\r");
    while(1){
    	simple_delay(10000000);
    	led_value = ~led_value;
    	xil_printf("led value set to %x\r\n",led_value);
		XGpio_DiscreteWrite(&led_gpio, 1 , led_value);
    }

    cleanup_platform();
    return 0;
}

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Run the program
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View the result from the consule
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The led on Zedboard should start blinking

## Program the project into flash
### 6. Program into flash
Create and name a new project "fsbl"
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Use template "Zynq FSBL"
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Create Boot Image
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Create a new folder "boorImage" in fsbl
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Add the following files into path
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Add fsbl.elf
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Add design.bit file
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Add project .elf file
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Program flash
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Select the created boot image file
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Change the jumper to QSPI mode

**Turn off and turn on the board, and it should start blinking**

## Reference Website
https://reference.digilentinc.com/learn/programmable-logic/tutorials/zedboard-programming-guide/start
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https://www.itread01.com/content/1544376606.html