What is the penalty in interrupt mode?

I am very interested in knowing the limitations of interrupt mode for my application. I will use a 4472 and I need max sampling rate (100 KS/s each channel), connected to a 6034 (1 channel 100 KHz) with RTSI. I will use pre-trigger mode. Will interrupt mode support this?
I need interrupt mode because i need to know when the trigger arrives in order to "more or less" sinchronize with some devices not from national

Ignacio;
I'm assuming you are interested on configuring the data transfer of your data acquisition devices to be interrupt based.
If that is the case, the data transfer performance will drop in relation to the DMA based data transfer. Furthermore, the data transfer will be system dependent, meaning that the maximum transfer rate will be determine by how fast your machine handles the interrupts.
The only limitation is the sample rate of your acquisition. In case you set the data transfer to be interrupt based, you will probably need to drop the sample rate in order the on board FIFO not to be overflowed.
Hope this helps.
Filipe A.
Applications Engineer
National Instruments

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* AT ALL TIMES.
* @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_2_DEVICE_ID
#define INTC_DEVICE_ID XPAR_INTC_0_DEVICE_ID
#define UARTLITE_INT_IRQ_ID XPAR_INTC_0_UARTLITE_2_VEC_ID
* The following constant controls the length of the buffers to be sent
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#define TEST_BUFFER_SIZE 100
/**************************** 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 *****************************/
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XIntc InterruptController; /* The instance of the Interrupt Controller */
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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;
xil_printf("Started\n");
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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.
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* @note
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int UartLiteIntrExample(u16 DeviceId)
int Status;
int Index;
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Status = XUartLite_Initialize(&UartLite, DeviceId);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
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Status = XUartLite_SelfTest(&UartLite);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
* Connect the UartLite to the interrupt subsystem such that interrupts can
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Status = SetupInterruptSystem(&UartLite);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
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XUartLite_SetSendHandler(&UartLite, SendHandler, &UartLite);
XUartLite_SetRecvHandler(&UartLite, RecvHandler, &UartLite);
* Enable the interrupt of the UartLite so that interrupts will occur.
XUartLite_EnableInterrupt(&UartLite);
* 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;
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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
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while ((TotalReceivedCount != TEST_BUFFER_SIZE) ||
(TotalSentCount != TEST_BUFFER_SIZE)) {
for (Index = 0; Index < TEST_BUFFER_SIZE; Index++)
xil_printf("%d",ReceiveBuffer[Index]);
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for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
if (ReceiveBuffer[Index] != SendBuffer[Index]) {
return XST_FAILURE;
return XST_SUCCESS;
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* 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,
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* @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;
* 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;
* 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.
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if (Status != XST_SUCCESS) {
return XST_FAILURE;
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* for the device occurs, the device driver handler performs the
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(XInterruptHandler)XUartLite_InterruptHandler,
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Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
(Xil_ExceptionHandler)XIntc_InterruptHandler,
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Hello,
I have a KC705 board, with Microblaze on it. My software is Witten above the operating system of µC/OS-II.I am trying to write multi task ie. task1 and task2. Application that uses the MicroBlaze which runs the MicroC-OS-II.
I am using the UARTLITE able to run hello world program successfully is with MicroC-OS-II.I read the documentations, On how the OS handles multi task, but I am little confused on how to implement..(i am new to RTOS). Please suggest me or share the any documents, any example codes.
~thanks
ASHIOK H

My phone keeps on turning itself on therefore interrupts the ongoing "iPhone Recovery Mode" in iTunes. This then makes me go back to square one: restore and wait 4 hours over and over again. What do I do to make it not get up again?

My phone keeps on turning itself on, therefore interrupts the ongoing "iPhone Recovery Mode" in iTunes. This then makes me go back to square one: restore and wait 4 hours over and over again. What do I do to make it not get up again?

There's a whole lot to read in your post, and frankly I have not read it all.
Having said that, this troubleshooting guide should help:
http://support.apple.com/kb/TS1538
In particular, pay attention to the mobile device support sections near the bottom, assuming you have already done the items above it.

What is the penalty in interrupt mode?

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