Microblaze Timer计数中断

kenson · 发表于 2019-10-6 16:45

本帖最后由 kenson 于 2019-10-6 17:12 编辑

#include <stdio.h>
#include "platform.h"
#include "xparameters.h"
#include "xgpio.h"
#include "xintc.h"
#include "xtmrctr.h"
#include "xil_exception.h"

#define CH1 1

XGpio LED;
XGpio SW;
XGpio KEY;
XIntc Intc;

u8 count;

/************************** interrupt handler process****************************/
void timer_int_handler(void *CallBackRef)
{
  unsigned int csr;
  csr = XTmrCtr_GetControlStatusReg(XPAR_AXI_TIMER_0_BASEADDR,0); // read control/status register
  if(csr &XTC_CSR_INT_OCCURED_MASK)count++;

  XTmrCtr_SetControlStatusReg(XPAR_AXI_TIMER_0_BASEADDR,0, csr); //clear interrupt indication
}

void SwHandler(void *CallbackRef)
{

XGpio *GpioPtr = (XGpio *)CallbackRef;
xil_printf("Switch Interrupt!\r\n");
// Clear the Interrupt
XGpio_InterruptClear(GpioPtr, 1);

}

void KeyHandler(void *CallbackRef)
{

XGpio *GpioPtr = (XGpio *)CallbackRef;
xil_printf("Push_Button Interrupt!\r\n");
// Clear the Interrupt
XGpio_InterruptClear(GpioPtr, 1);

}

void print(char *str);

int main()
{
init_platform();

XGpio_Initialize(&LED, XPAR_LEDS_DEVICE_ID);
XGpio_Initialize(&SW,  XPAR_DIP_SWITCHES_DEVICE_ID);
XGpio_Initialize(&KEY, XPAR_PUSH_BUTTONS_DEVICE_ID);

XGpio_SetDataDirection(&LED, CH1, 0);
XGpio_SetDataDirection(&SW,  CH1, 1);
XGpio_SetDataDirection(&KEY, CH1, 1);

XGpio_DiscreteWrite(&LED, CH1, 0xff);  //all clear LEDS to off

XIntc_Initialize(&Intc, XPAR_INTC_0_DEVICE_ID);

XIntc_Connect(&Intc, XPAR_MICROBLAZE_0_INTC_DIP_SWITCHES_IP2INTC_IRPT_INTR,
                        (XInterruptHandler)SwHandler,
                        (void *)&SW);

XIntc_Connect(&Intc, XPAR_MICROBLAZE_0_INTC_PUSH_BUTTONS_IP2INTC_IRPT_INTR,
                        (XInterruptHandler)KeyHandler,
                        (void *)&KEY);

XIntc_RegisterHandler(XPAR_INTC_0_BASEADDR, //register timer0 interrupt and handler process
               XPAR_MICROBLAZE_0_INTC_AXI_TIMER_0_INTERRUPT_INTR,
                     (XInterruptHandler) timer_int_handler,
                     (void *)XPAR_AXI_TIMER_0_BASEADDR);

XTmrCtr_SetLoadReg(XPAR_AXI_TIMER_0_BASEADDR,0,50000000);
XTmrCtr_EnableIntr(XPAR_AXI_TIMER_0_BASEADDR, 0);

XTmrCtr_SetControlStatusReg(XPAR_AXI_TIMER_0_BASEADDR, 0,
                              XTC_CSR_ENABLE_TMR_MASK |
                              XTC_CSR_ENABLE_INT_MASK |
                              XTC_CSR_AUTO_RELOAD_MASK |
                              XTC_CSR_DOWN_COUNT_MASK);

XIntc_Start(&Intc, XIN_REAL_MODE); //set MER  enable IRQ to CPU

XIntc_Enable(&Intc, XPAR_INTC_0_GPIO_2_VEC_ID); //set IER for push_buttons enable interrupt
XIntc_Enable(&Intc, XPAR_INTC_0_GPIO_0_VEC_ID); //set IER for switches enable interrupt

Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
            (Xil_ExceptionHandler)XIntc_InterruptHandler,
            &Intc);

Xil_ExceptionEnable();

XGpio_InterruptEnable(&KEY, CH1);
XGpio_InterruptGlobalEnable(&KEY);

XGpio_InterruptEnable(&SW, CH1);
XGpio_InterruptGlobalEnable(&SW);

print("Hello World\n\r");

while(1)
{

}

return 0;
}

这个模式直接操作地址比建立一个实体来操作会快好多

kenson · 发表于 2019-10-6 16:47

因为CPU时钟为100MHZ所以计数器要达到50000000 5千万才能有1秒左右的计数

kenson · 发表于 2019-10-6 16:49

microblaze_enable_interrupts();
代替
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
(Xil_ExceptionHandler)XIntc_InterruptHandler,
&Intc);

Xil_ExceptionEnable();

kenson · 发表于 2019-10-6 17:20

xilinx 的microblaze 有两个TIME 一个是time0 和 time1 它是靠
XTmrCtr_Config XTmrCtr_ConfigTable[]=
{
{
  XPAR_AXI_TIMER_0_DIVEICE_ID,
  XPAR_AXI_TIMER_0_BASSADDR
},
{
XPAR_AXI_TIMER_1_DIVEICE_ID, //如果硬件enable 了两个就会有两个初始化的数组，
XPAR_AXI_TIMER_1_BASSADDR    //如果只有一个那么只有上面一个数组了
}
};

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Microblaze Timer计数中断

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