（基础篇）S05-CH03-User-IP

module LED_ML(

input CLK_i,//100MHZ

input RSTn_i,

output reg [3:0]LED_o

);

reg [31:0]C0;

always @(posedge CLK_i)

if(!RSTn_i)

begin

LED_o <= 4'b0001;

C0 <= 32'h0;

end

else

begin

if(C0 == 32'd49_999_999)//1s

begin

C0 <= 32'h0;

if(LED_o == 4'b1000)

LED_o <= 4'b0001;

else LED_o <= LED_o << 1;

end

else begin C0 <= C0 + 1'b1; LED_o <= LED_o; end

end

endmodule

/***************************** Include Files *********************************/

#include "xparameters.h"

#include "xgpio.h"

#include "sleep.h"

/************************** Constant Definitions *****************************/

/*

 * The following constants map to the XPAR parameters created in the

 * xparameters.h file. They are defined here such that a user can easily

 * change all the needed parameters in one place.

 */

#define GPIO_EXAMPLE_DEVICE_ID  XPAR_GPIO_0_DEVICE_ID

/*

 * The following constant is used to determine which channel of the GPIO is

 * used for the LED if there are 2 channels supported.

 */

#define LED_CHANNEL 1

/*

 * The following are declared globally so they are zeroed and so they are

 * easily accessible from a debugger

 */

XGpio Gpio; /* The Instance of the GPIO Driver */

/*****************************************************************************/

/**

*

* The purpose of this function is to illustrate how to use the GPIO

* driver to turn on and off an LED.

*

* @param None

*

* @return XST_FAILURE to indicate that the GPIO Initialization had

* failed.

*

* @note This function will not return if the test is running.

*

******************************************************************************/

int main(void)

{

int Status;

/* Initialize the GPIO driver */

Status = XGpio_Initialize(&Gpio, GPIO_EXAMPLE_DEVICE_ID);

if (Status != XST_SUCCESS) {

return XST_FAILURE;

}

/* Set the direction for all signals as inputs except the LED output */

XGpio_SetDataDirection(&Gpio, LED_CHANNEL, 0);

/* Loop forever blinking the LED */

XGpio_DiscreteWrite(&Gpio, LED_CHANNEL, 0);

usleep(50000);

XGpio_DiscreteWrite(&Gpio, LED_CHANNEL, 1);

return XST_SUCCESS;

}