中断执行后，为何没有返回到主程序中?
中断执行后，为何没有返回到主程序main()中?
我试着编了一个timer中断的小程序，当计到某一数值时可以调用一个中断，但调用中断后，为何没能返回到我的主程序main()继续执行下面的程序呢？请大侠过来看看。
#include "xparameters.h"
#include "stdio.h"
#include "xgpio_l.h"
#include "xtmrctr_l.h"
#include "xintc_l.h"
#include "xgpio.h"
#include "xexception_l.h"
XGpio Gpio;
int intc_command=0;
#define timer_count 0x4000000
#define GPIO_EXAMPLE_DEVICE_ID XPAR_GENERIC_GPIO_DEVICE_ID
/* Timer interrupt service routine */
void timeinthandle(void * baseaddr_p) //
{
int csr;
/* Read timer 0 CSR to see if it requested the interrupt */
csr = XTmrCtr_mGetControlStatusReg(XPAR_OPB_TIMER_0_BASEADDR, 0);
if(csr&XTC_CSR_INT_OCCURED_MASK)
{
XGpio_SetDataDirection(&Gpio, 1, 0x0);
XGpio_mSetDataReg(XPAR_GENERIC_GPIO_BASEADDR, 1, \
(0x03 ^ XGpio_mGetDataReg(XPAR_GENERIC_GPIO_BASEADDR, 1)));
}
/* Clear the timer interrupt */
XTmrCtr_mSetControlStatusReg(XPAR_OPB_TIMER_0_BASEADDR, 0, csr);
intc_command = XTRUE;
}
/* Interrupt test routine */
void InterruptTest(void)
{
int tmrvalue;
print("-- Entering InterruptTest() --\r");
/* Initialize exception handling */
XExc_Init();
/* Register external interrupt handler */
XExc_RegisterHandler(XEXC_ID_NON_CRITICAL_INT,
(XExceptionHandler)XIntc_DeviceInterruptHandler,
(void *)XPAR_OPB_INTC_0_DEVICE_ID);
/* Start the interrupt controller */
XIntc_mMasterEnable(XPAR_OPB_INTC_0_BASEADDR);
/* Set the gpio for LEDs as output 1 is the channel used*/
XGpio_Initialize(&Gpio, GPIO_EXAMPLE_DEVICE_ID);
XGpio_SetDataDirection(&Gpio, 1, 0x0);
/* Set the number of cycles the timer counts before interrupting */
XTmrCtr_mSetLoadReg(XPAR_OPB_TIMER_0_BASEADDR, 0, timer_count);
/* Reset the timers, and clear interrupts */
XTmrCtr_mSetControlStatusReg(XPAR_OPB_TIMER_0_BASEADDR, 0,
XTC_CSR_INT_OCCURED_MASK | XTC_CSR_LOAD_MASK );
// clear the load bit
XTmrCtr_mSetControlStatusReg(XPAR_OPB_TIMER_0_BASEADDR, 0,0x0 );
/* Enable timer interrupt requests in the interrupt controller */
XIntc_mEnableIntr(XPAR_OPB_INTC_0_BASEADDR,
XPAR_OPB_TIMER_0_INTERRUPT_MASK);
/* Start the timers */
XTmrCtr_mSetControlStatusReg(XPAR_OPB_TIMER_0_BASEADDR, 0,
XTC_CSR_ENABLE_TMR_MASK | XTC_CSR_ENABLE_INT_MASK |
XTC_CSR_AUTO_RELOAD_MASK | XTC_CSR_DOWN_COUNT_MASK);
/* Enable PPC non-critical interrupts */
XExc_mEnableExceptions(XEXC_NON_CRITICAL);
//wait the interrupt to occur
while(!intc_command)
{
xil_printf("Main Program\n");
}
xil_printf("Main Program Continue\n");
/* Disable PPC non-critical interrupts */
XTmrCtr_mSetControlStatusReg(XPAR_OPB_TIMER_0_BASEADDR, 0,
XTC_CSR_IN T_OCCURED_MASK );
XExc_mDisableExceptions(XEXC_NON_CRITICAL);
print("-- Exiting InterruptTest() --\r\n");
}
/* End user-supplied interrupt test routine */
//====================================================
int main (void)
{
print("-- Entering main() --\r\n");
InterruptTest();
print("-- Exiting main() --\r\n");
return 0;
}
执行到蓝色部分时，会调用中断服务程序void timeinthandle(void * baseaddr_p) ，在这个程序程序 中令intc_command=XTRUE,这样就不再去执行中断了，但它却继续执行，而为什么没有退出到while（(!intc_command）去执行下面的程序呢？
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