int main()
{
init_platform();
XIOModule_Initialize(&gpo, XPAR_IOMODULE_0_DEVICE_ID); // Initialize the GPO module
microblaze_register_handler(XIOModule_DeviceInterruptHandler,
XPAR_IOMODULE_0_DEVICE_ID); // register the interrupt handler
XIOModule_Start(&gpo); // start the GPO module
XIOModule_Connect(&gpo, XIN_IOMODULE_FIT_1_INTERRUPT_INTR, timerTick,
NULL); // register timerTick() as our interrupt handler
XIOModule_Enable(&gpo, XIN_IOMODULE_FIT_1_INTERRUPT_INTR); // enable the interrupt
microblaze_enable_interrupts(); // enable global interrupts
u8 leds = 0;
while (1){
// write the LED value to port 1 (you can have up to 4 ports)
XIOModule_DiscreteWrite(&gpo, 1, leds++);
xil_printf("%d", leds);
xil_printf(",");
delay(500); // delay one half second
}
return 0;
}
/**
*
* This function connects the interrupt handler of the IO Module to the
* processor. This function is separate to allow it to be customized for each
* application. Each processor or RTOS may require unique processing to connect
* the interrupt handler.
*
* @param None.
*
* @return None.
*
* @note None.
*
****************************************************************************/
XStatus SetUpInterruptSystem(XIOModule *XIOModuleInstancePtr)
{
XStatus Status;
/*
* 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 = XIOModule_Connect(XIOModuleInstancePtr, IOMODULE_DEVICE_ID,
(XInterruptHandler) DeviceDriverHandler,
(void *)0);
if (Status != XST_SUCCESS)
{
return XST_FAILURE;
}
/*
* Start the IO Module such that interrupts are enabled for all devices
* that cause interrupts.
*/
Status = XIOModule_Start(XIOModuleInstancePtr);
if (Status != XST_SUCCESS)
{
return XST_FAILURE;
}
/*
* Enable interrupts for the device and then cause interrupts so the
* handlers will be called.
*/
XIOModule_Enable(XIOModuleInstancePtr, IOMODULE_DEVICE_ID);
/*
* Initialize the exception table.
*/
Xil_ExceptionInit();
/*
* Register the IO module interrupt handler with the exception table.
*/
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
(Xil_ExceptionHandler)XIOModule_DeviceInterruptHandler,
(void*) 0);
/*
* Enable exceptions.
*/
Xil_ExceptionEnable();
return XST_SUCCESS;
}
/**
* This function does a minimal test on the IO Module device and driver as a
* design example. The purpose of this function is to illustrate how to use the
* IO Module component. It initializes the Programmable Interval Timers and
* then sets it up in compare mode with auto reload such that a periodic
* interrupt is generated.
*
* This function uses interrupt driven mode of the IO Module.
*
* @param IOModuleInstancePtr is a pointer to the IO Module driver
* Instance
* @param DeviceId is the XPAR_<IOModule_instance>_DEVICE_ID value from
* xparameters.h
*
* @return XST_SUCCESS if the Test is successful, otherwise XST_FAILURE
*
* @note This function contains an infinite loop such that if interrupts
* are not working it may never return.
*
*****************************************************************************/
XStatus IOModuleIntrExample(XIOModule *IOModuleInstancePtr, u16 DeviceId)
{
int Status;
u8 Timer;
XIOModule_Config *CfgPtr = IOModuleInstancePtr->CfgPtr;
/*
* Initialize the IO Module so that it's ready to use, specify the device
* ID that is generated in xparameters.h
*/
Status = XIOModule_Initialize(IOModuleInstancePtr, DeviceId);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Perform a self-test to ensure that the hardware was built correctly.
*/
Status = XIOModule_SelfTest(IOModuleInstancePtr);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Initialize and enable interrupts in the processor.
*/
IOModuleSetupIntrSystem(IOModuleInstancePtr);
/*
* Setup the handler for the IO Module handler that will be called from
* the interrupt context when an interrupt occurs, specify a pointer to
* the IO Module driver instance as the callback reference so the
* handler is able to access the instance data.
*/
XIOModule_SetHandler(IOModuleInstancePtr,
IOModuleHandler,
IOModuleInstancePtr);
for (Timer = 0; Timer < XTC_DEVICE_TIMER_COUNT; Timer++)
{
/*
* Skip unused timers,timers with prescaler (since they may
* have very long expiration times), timers without readable
* counters, and timers with small size (since the counter
* may not change when sampled).
*/
if (! (CfgPtr->PitUsed[Timer] &&
CfgPtr->PitPrescaler[Timer] == XTC_PRESCALER_NONE &&
CfgPtr->PitReadable[Timer] &&
CfgPtr->PitSize[Timer] > MIN_TIMER_BITS)) {
TimerExpired[Timer] = MAX_INTR_COUNT;
continue;
}
/*
* Use auto reload mode such that the Programmable Interval Timers will
* reload automatically and continue repeatedly, without this option
* they would expire once only
*/
XIOModule_Timer_SetOptions(IOModuleInstancePtr, Timer,
XTC_INT_MODE_OPTION | XTC_AUTO_RELOAD_OPTION);
/*
* Set a reset value for the Programmable Interval Timers such that
* they will expire earlier than letting them roll over from 0, the
* reset value is loaded into the Programmable Interval Timers when
* they are started.
*/
XIOModule_SetResetValue(IOModuleInstancePtr, Timer, RESET_VALUE);
/*
* Enable the interrupt for the Programmable Interval Timers.
*/
XIOModule_Enable(IOModuleInstancePtr,
Timer + XIN_IOMODULE_PIT_1_INTERRUPT_INTR);
/*
* Start the Programmable Interval Timers such that they are
* decrementing by default, then wait for them to timeout a number of
* times.
*/
XIOModule_Timer_Start(IOModuleInstancePtr, Timer);
}
while (1) {
int TotalExpiredCount = 0;
/*
* Wait for the Programmable Interval Timers to expire as indicated by
* the shared variable which the handler will increment, and stop each
* timer when it has reached the expected number of times.
*/
for (Timer = 0; Timer < XTC_DEVICE_TIMER_COUNT; Timer++) {
if (TimerExpired[Timer] >= MAX_INTR_COUNT)
XIOModule_Timer_Stop(IOModuleInstancePtr, Timer);
TotalExpiredCount += TimerExpired[Timer];
}
/*
* If all timers have expired the expected number of times, then stop
* this example.
*/
if (TotalExpiredCount == MAX_INTR_COUNT * XTC_DEVICE_TIMER_COUNT) {
break;
}
}
IOModuleDisableIntr(IOModuleInstancePtr);
return XST_SUCCESS;
}
