用bios实现硬件中断功能时要注意什么？弄了一个月都没弄出

只看该作者 · 2009-6-23 13:32

我用普通的中断方式实现uart串口通信可以，
但用bios 方式中断却没有中断产生不知为什么，下面这个程序有错吗？
恳请各位高手给指点一下！
我买的开发板，在上面做DM642做UART串口通信实验。它是由一个外围芯片TL16C752B提供两个中断请求信号INTA、INTB分别用于通道A和B申请TMS320DM642的中断。在DM642中，INTA和ITB相与，复用DM642的INT5.

#include <csl.h>
#include <csl_emifa.h>
#include <csl_irq.h>
#include <csl_chip.h>
#include "stdio.h"

#include "seeddm642.h"
#include "seeddm642_uart.h"

/*SEEDDM642的emifa的设置结构*/
EMIFA_Config Seeddm642ConfigA ={
       0x00052078,/*gblctl EMIFA(B)global control register value */
                     /*将CLK6、4、1使能；将MRMODE置1；使能EK2EN,EK2RATE*/
       0xffffffd3,/*cectl0 CE0 space control register value*/
                     /*将CE0空间设为SDRAM*/
       0x73a28e01,/*cectl1 CE1 space control register value*/
                     /*Read hold: 1 clock;
                       MTYPE : 0000,选择8位的异步接口
                       Read strobe ：001110；14个clock宽度
                       TA：2 clock; Read setup 2 clock;
                       Write hold :2 clock; Write strobe: 14 clock
                       Write setup :7 clock
                       --                     ---------------
                                    14c        /1c
                           ----------------/ */
       0x22a28a22, /*cectl2 CE2 space control register value*/
       0x22a28a42, /*cectl3 CE3 space control register value*/
       0x57115000, /*sdctl SDRAM control register value*/
       0x0000081b, /*sdtim SDRAM timing register value*/
       0x001faf4d, /*sdext SDRAM extension register value*/
       0x00000002, /*cesec0 CE0 space secondary control register value*/
       0x00000002, /*cesec1 CE1 space secondary control register value*/
       0x00000002, /*cesec2 CE2 space secondary control register value*/
       0x00000073 /*cesec3 CE3 space secondary control register value*/
};

SEEDDM642_UART_Config UartConfig ={
       0x01,/*寄存器IER*/
       0x57,/*寄存器FCR*/
       0x03,/*寄存器LCR*/
       0x08,/*寄存器MCR*/
};

extern far void vectors();

Uint8 IOreadback;
Uint16 buffer;
SEEDDM642_UART_Handle SEEDuartHandleA;
SEEDDM642_UART_Handle SEEDuartHandleB;

/*此程序可将四个采集口的数据经过Video Port0送出*/
void main()
{

/*-------------------------------------------------------*/
/* perform all initializations                           */
/*-------------------------------------------------------*/
    /*Initialise CSL，初始化CSL库*/
    CSL_init();
/*----------------------------------------------------------*/
    /*EMIFA的初始化，将CE0设为SDRAM空间，CE1设为异步空间
     注，DM642支持的是EMIFA，而非EMIF*/
    EMIFA_config(&Seeddm642ConfigA);
/*----------------------------------------------------------*/
    IRQ_globalDisable();
    IRQ_nmiEnable();

    IRQ_enable(IRQ_EVT_EXTINT5);
    IRQ_globalEnable();
    /*中断向量表的初始化*/
    //Point to the IRQ vector table


/*测试串口A*/
    /* Open UART */
    SEEDuartHandleA = SEEDDM642_UART_open(SEEDDM642_UARTA,
                                          SEEDDM642_UART_BAUD9600,
                                          &UartConfig);
    /*Open UARTB*/
    SEEDuartHandleB = SEEDDM642_UART_open(SEEDDM642_UARTB,
                                          SEEDDM642_UART_BAUD9600,
                                          &UartConfig);
     IRQ_setVecs(vectors);
     printf("Uart Test Begin... ");

}

    interrupt void uart_isr(void)
    {
      Uint16 Data_Temp;
      Data_Temp = SEEDDM642_UART_rget(SEEDuartHandleA,0);
      printf("DATA : %x ",Data_Temp);
    }