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*
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******************************************************************************/
/*****************************************************************************/
/**
* @file xgpio_example.c
*
* This file contains a design example using the GPIO driver (XGpio) and hardware
* device. It only uses a channel 1 of a GPIO device.
*
* This example can be ran on the Xilinx ML300 board using the Prototype Pins &
* LEDs of the board connected to the GPIO.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a rmm 03/13/02 First release
* 1.00a rpm 08/04/03 Removed second example and invalid macro calls
* 2.00a jhl 12/15/03 Added support for dual channels
* 2.00a sv 04/20/05 Minor changes to comply to Doxygen and coding guidelines
* 3.00a ktn 11/20/09 Minor changes as per coding guidelines.
*
* </pre>
******************************************************************************/
/***************************** Include Files *********************************/
#include "xparameters.h"
#include "xgpio.h"
/************************** Constant Definitions *****************************/
#define LED 0x01 /* Assumes bit 0 of GPIO is connected to an LED */
/*
* The following constant maps to the name of the hardware instances that
* were created in the EDK XPS system.
*/
#define GPIO_EXAMPLE_DEVICE_ID XPAR_LEDS_POSITIONS_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 1000000
/*
* 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 level 1
* driver to turn on and off an LED.
*
* @param None
*
* @return XST_FAILURE to indicate that the GPIO Intialisation had failed.
*
* @note This function will not return if the test is running.
*
******************************************************************************/
int main(void)
{
u32 Data;
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 to be inputs except the
* LED output
*/
XGpio_SetDataDirection(&Gpio, LED_CHANNEL, ~LED);
/* Loop forever blinking the LED */
while (1) {
/*
* Read the state of the data so that only the LED state can be
* modified
*/
Data = XGpio_DiscreteRead(&Gpio, LED_CHANNEL);
/*
* Set the LED to the opposite state such that it blinks using
* the first method, two methods are used for illustration
* purposes only
*/
if (Data & LED) {
XGpio_DiscreteWrite(&Gpio, LED_CHANNEL, Data & ~LED);
} else {
XGpio_DiscreteWrite(&Gpio, LED_CHANNEL, Data | LED);
}
/* Wait a small amount of time so the LED is visible */
for (Delay = 0; Delay < LED_DELAY; Delay++);
/*
* Read the state of the data so that only the LED state can be
* modified
*/
Data = XGpio_DiscreteRead(&Gpio, LED_CHANNEL);
/*
* Set the LED to the opposite state such that it blinks using
* the other API functions
*/
if (Data & LED) {
XGpio_DiscreteClear(&Gpio, LED_CHANNEL, LED);
} else {
XGpio_DiscreteSet(&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;
}