（基础篇）S05-CH02-GPIO-LED

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

#include "xparameters.h"

#include "xgpio.h"

#include "sleep.h"

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

#define LED 0x01   /* Assumes bit 0 of GPIO is connected to an LED  */

/*

 * 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 wait after an LED is turned on to make

 * sure that it is visible to the human eye.  This constant might need to be

 * tuned for faster or slower processor speeds.

 */

#define LED_DELAY     10000000

/*

 * 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

/**************************** Type Definitions *******************************/

/***************** Macros (Inline Functions) Definitions *********************/

#ifdef PRE_2_00A_APPLICATION

/*

 * The following macros are provided to allow an application to compile that

 * uses an older version of the driver (pre 2.00a) which did not have a channel

 * parameter. Note that the channel parameter is fixed as channel 1.

 */

#define XGpio_SetDataDirection(InstancePtr, DirectionMask) \

        XGpio_SetDataDirection(InstancePtr, LED_CHANNEL, DirectionMask)

#define XGpio_DiscreteRead(InstancePtr) \

        XGpio_DiscreteRead(InstancePtr, LED_CHANNEL)

#define XGpio_DiscreteWrite(InstancePtr, Mask) \

        XGpio_DiscreteWrite(InstancePtr, LED_CHANNEL, Mask)

#define XGpio_DiscreteSet(InstancePtr, Mask) \

        XGpio_DiscreteSet(InstancePtr, LED_CHANNEL, Mask)

#endif

/************************** Function Prototypes ******************************/

/************************** Variable Definitions *****************************/

/*

 * 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;

volatile int Delay;

/* 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, ~LED);

/* Loop forever blinking the LED */

while (1) {

/* Set the LED to High */

XGpio_DiscreteWrite(&Gpio, LED_CHANNEL, LED);

/* Wait a small amount of time so the LED is visible */

for (Delay = 0; Delay < LED_DELAY; Delay++);

/* Clear the LED bit */

XGpio_DiscreteClear(&Gpio, LED_CHANNEL, LED);

/* Wait a small amount of time so the LED is visible */

for (Delay = 0; Delay < LED_DELAY; Delay++);

}

return XST_SUCCESS;

}

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

#include "xparameters.h"

#include "xgpio.h"

#include "xil_printf.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;

int i;

/* 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 */

while (1) {

for(i=0; i< 4; i++){

XGpio_DiscreteWrite(&Gpio, LED_CHANNEL, 0x01 <<i);

usleep(10000);

}

}

return XST_SUCCESS;

}