UART application

Which UART are you trying to use, UART1 which is connected by default to the USB-UART device, or UART0 which is not connected by default? Exactly what are you attempting to do? And which Xilinx example is not working.

-Gary

Which UART are you trying to use, UART1 which is connected by default to the USB-UART device, or UART0 which is not connected by default? Exactly what are you attempting to do? And which Xilinx example is not working.

-Gary

I have already connected the UART0 and UART1 to the Pmod port and didn't have any problem with it. Also I have already test hello world for both of them. The problem occurs when I tried get data from other device with UART and use them as an interrupt. thx alot.








* @file xuartlite_intr_example.c
*
* This file contains a design example using the UartLite driver (XUartLite) and
* hardware device using the interrupt mode.
*
* @note
*
* The user must provide a physical loopback such that data which is
* transmitted will be received.
*
* MODIFICATION HISTORY:
* <pre>
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a jhl  02/13/02 First release
* 1.00b rpm  10/01/03 Made XIntc declaration global
* 1.00b sv   06/09/05 Minor changes to comply to Doxygen and coding guidelines
* 2.00a ktn  10/20/09 Updated to use HAL Processor APIs and minor changes
*              for coding guidelnes.
* </pre>
******************************************************************************/

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

#include "xparameters.h"
#include "xuartlite.h"
#include "xintc.h"
#include "xil_exception.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 UARTLITE_DEVICE_ID      XPAR_UARTLITE_0_DEVICE_ID
#define INTC_DEVICE_ID          XPAR_INTC_0_DEVICE_ID
#define UARTLITE_INT_IRQ_ID     XPAR_INTC_0_UARTLITE_1_VEC_ID

/*
* The following constant controls the length of the buffers to be sent
* and received with the UartLite device.
*/
#define TEST_BUFFER_SIZE        1


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


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


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

int UartLiteIntrExample(u16 DeviceId);

int SetupInterruptSystem(XUartLite *UartLitePtr);

void SendHandler(void *CallBackRef, unsigned int EventData);

void RecvHandler(void *CallBackRef, unsigned int EventData);

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

XUartLite UartLite;            /* The instance of the UartLite Device */

XIntc InterruptController;     /* The instance of the Interrupt Controller */

/*
* The following variables are shared between non-interrupt processing and
* interrupt processing such that they must be global.
*/

/*
* The following buffers are used in this example to send and receive data
* with the UartLite.
*/
u8 SendBuffer[TEST_BUFFER_SIZE];
u8 ReceiveBuffer[TEST_BUFFER_SIZE];

/*
* The following counters are used to determine when the entire buffer has
* been sent and received.
*/
static volatile int TotalReceivedCount;
static volatile int TotalSentCount;


/******************************************************************************/
/**
*
* Main function to call the UartLite interrupt example.
*
* @param    None
*
* @return    XST_SUCCESS if successful, XST_FAILURE if unsuccessful
*
* @note        None
*
*******************************************************************************/
int main(void)
{
    int Status;

    /*
     * Run the UartLite Interrupt example, specify the Device ID that is
     * generated in xparameters.h.
     */
    Status = UartLiteIntrExample(UARTLITE_DEVICE_ID);
    if (Status != XST_SUCCESS) {
        return XST_FAILURE;
    }

    return XST_SUCCESS;
}

/****************************************************************************/
/**
*
* This function does a minimal test on the UartLite device and driver as a
* design example. The purpose of this function is to illustrate
* how to use the XUartLite component.
*
* This function sends data and expects to receive the same data through the
* UartLite. The user must provide a physical loopback such that data which is
* transmitted will be received.
*
* This function uses interrupt driver mode of the UartLite device. The calls
* to the UartLite driver in the handlers should only use the non-blocking
* calls.
*
* @param    DeviceId is the Device ID of the UartLite Device and is the
*        XPAR_<uartlite_instance>_DEVICE_ID value from xparameters.h.
*
* @return    XST_SUCCESS if successful, otherwise XST_FAILURE.
*
* @note
*
* This function contains an infinite loop such that if interrupts are not
* working it may never return.
*
****************************************************************************/
int UartLiteIntrExample(u16 DeviceId)
{
    int Status;
    int Index;

    /*
     * Initialize the UartLite driver so that it's ready to use.
     */
    Status = XUartLite_Initialize(&UartLite, DeviceId);
    if (Status != XST_SUCCESS) {
        return XST_FAILURE;
    }

    /*
     * Perform a self-test to ensure that the hardware was built correctly.
     */
    Status = XUartLite_SelfTest(&UartLite);
    if (Status != XST_SUCCESS) {
        return XST_FAILURE;
    }

    /*
     * Connect the UartLite to the interrupt subsystem such that interrupts can
     * occur. This function is application specific.
     */
    Status = SetupInterruptSystem(&UartLite);
    if (Status != XST_SUCCESS) {
        return XST_FAILURE;
    }

    /*
     * Setup the handlers for the UartLite that will be called from the
     * interrupt context when data has been sent and received, specify a
     * pointer to the UartLite driver instance as the callback reference so
     * that the handlers are able to access the instance data.
     */
    XUartLite_SetSendHandler(&UartLite, SendHandler, &UartLite);
    XUartLite_SetRecvHandler(&UartLite, RecvHandler, &UartLite);

    /*
     * Enable the interrupt of the UartLite so that interrupts will occur.
     */
    XUartLite_EnableInterrupt(&UartLite);
    xil_printf("run");
    /*
     * Initialize the send buffer bytes with a pattern to send and the
     * the receive buffer bytes to zero to allow the receive data to be
     * verified.
     */
//    for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
//        SendBuffer[Index] = Index;
//        ReceiveBuffer[Index] = 0;
//    }
//
//    /*
//     * Start receiving data before sending it since there is a loopback.
//     */
//    XUartLite_Recv(&UartLite, ReceiveBuffer, TEST_BUFFER_SIZE);
//
//    /*
//     * Send the buffer using the UartLite.
//     */
//    XUartLite_Send(&UartLite, SendBuffer, TEST_BUFFER_SIZE);
//
//    /*
//     * Wait for the entire buffer to be received, letting the interrupt
//     * processing work in the background, this function may get locked
//     * up in this loop if the interrupts are not working correctly.
//     */
//    while ((TotalReceivedCount != TEST_BUFFER_SIZE) ||
//        (TotalSentCount != TEST_BUFFER_SIZE)) {
//    }
//
//    /*
//     * Verify the entire receive buffer was successfully received.
//     */
//    for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
//        if (ReceiveBuffer[Index] != SendBuffer[Index]) {
//            return XST_FAILURE;
//        }
//    }
while(1);

    return XST_SUCCESS;
}

/*****************************************************************************/
/**
*
* This function is the handler which performs processing to send data to the
* UartLite. It is called from an interrupt context such that the amount of
* processing performed should be minimized. It is called when the transmit
* FIFO of the UartLite is empty and more data can be sent through the UartLite.
*
* This handler provides an example of how to handle data for the UartLite,
* but is application specific.
*
* @param    CallBackRef contains a callback reference from the driver.
*        In this case it is the instance pointer for the UartLite driver.
* @param    EventData contains the number of bytes sent or received for sent
*        and receive events.
*
* @return    None.
*
* @note        None.
*
****************************************************************************/
void SendHandler(void *CallBackRef, unsigned int EventData)
{
    TotalSentCount = EventData;
    print("send");
}

/****************************************************************************/
/**
*
* This function is the handler which performs processing to receive data from
* the UartLite. It is called from an interrupt context such that the amount of
* processing performed should be minimized.  It is called data is present in
* the receive FIFO of the UartLite such that the data can be retrieved from
* the UartLite. The size of the data present in the FIFO is not known when
* this function is called.
*
* This handler provides an example of how to handle data for the UartLite,
* but is application specific.
*
* @param    CallBackRef contains a callback reference from the driver, in
*        this case it is the instance pointer for the UartLite driver.
* @param    EventData contains the number of bytes sent or received for sent
*        and receive events.
*
* @return    None.
*
* @note        None.
*
****************************************************************************/
void RecvHandler(void *CallBackRef, unsigned int EventData)
{
    TotalReceivedCount = EventData;
    xil_printf("recv");
}

/****************************************************************************/
/**
*
* This function setups the interrupt system such that interrupts can occur
* for the UartLite device. This function is application specific since the
* actual system may or may not have an interrupt controller. The UartLite
* could be directly connected to a processor without an interrupt controller.
* The user should modify this function to fit the application.
*
* @param    UartLitePtr contains a pointer to the instance of the UartLite
*           component which is going to be connected to the interrupt
*           controller.
*
* @return   XST_SUCCESS if successful, otherwise XST_FAILURE.
*
* @note     None.
*
****************************************************************************/
int SetupInterruptSystem(XUartLite *UartLitePtr)
{

    int Status;


    /*
     * Initialize the interrupt controller driver so that it is ready to
     * use.
     */
    Status = XIntc_Initialize(&InterruptController, INTC_DEVICE_ID);
    if (Status != XST_SUCCESS) {
        return XST_FAILURE;
    }


    /*
     * Connect a device driver handler that will be called when an interrupt
     * for the device occurs, the device driver handler performs the
     * specific interrupt processing for the device.
     */
    Status = XIntc_Connect(&InterruptController, UARTLITE_INT_IRQ_ID,
               (XInterruptHandler)XUartLite_InterruptHandler,
               (void *)UartLitePtr);
    if (Status != XST_SUCCESS) {
        return XST_FAILURE;
    }

    /*
     * Start the interrupt controller such that interrupts are enabled for
     * all devices that cause interrupts, specific real mode so that
     * the UartLite can cause interrupts through the interrupt controller.
     */
    Status = XIntc_Start(&InterruptController, XIN_REAL_MODE);
    if (Status != XST_SUCCESS) {
        return XST_FAILURE;
    }

    /*
     * Enable the interrupt for the UartLite device.
     */
    XIntc_Enable(&InterruptController, UARTLITE_INT_IRQ_ID);

    /*
     * Initialize the exception table.
     */
    Xil_ExceptionInit();

    /*
     * Register the interrupt controller handler with the exception table.
     */
    Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
             (Xil_ExceptionHandler)XIntc_InterruptHandler,
             &InterruptController);

    /*
     * Enable exceptions.
     */
    Xil_ExceptionEnable();

    return XST_SUCCESS;
}