DM6437VPFE中断问题

Lin Yong，

VDINT0寄存器的值设置的是多少？一般是行数-5.

VDINT0的值不是0-7FFFh吗，怎么会出现-5呢？？

经过我的检查发现是ISTP写错了，现在已经可以进入中断了，但是发现返回不了主函数了。我写了下面的一个测试函数，应该是不断输出0和sum的值的，但是现在只有sum的值，没有flag的值0。

while(1)
{
if(flag==1)
{
flag=0;
printf("%d\n",flag);
}

}

interrupt void extint14_isr(void)
{
flag=1;
sum++;
printf("%d\n",sum);
return;
}

我设的是0，请问这个寄存器是干什么用的，我一直不懂。

Lin Yong,

VDINT0寄存器设置的是在外部帧同步有效后多少行后触发VD中断，这个值一般设定的是图像的行数-5。

我改成VDINT0设为0，它就一直不停得中断，好像是一个时钟周期就中断，反正很快，可一旦设置为别的值，就连中断也没了。是不是还有什么关键的寄存器我设置错误了？？下面的是我的ccdc的配置，能帮忙看一下吗？十分感谢。

void vpfe_init( Uint32 buffer, Uint32 width, Uint32 height)
{
//VPFE_CCDC_SYN_MODE = 0x00032F80; // INPUT
VPFE_CCDC_SYN_MODE = 0x00032F83; //VD as positive *********change VD HD output 0x00032F80
//VPFE_CCDC_SYN_MODE = 0x00032F87; // interlaced, with VD pority as negative VD HD output
// VPFE_CCDC_SYN_MODE = 0x00031084; //linger interlaced, with VD pority as negative VD HD output
//VPFE_CCDC_HD_VD_WID = 0x00010001;
VPFE_CCDC_HD_VD_WID = 0;
// VPFE_CCDC_PIX_LINES = 0x02CF0271;
VPFE_CCDC_PIX_LINES = 0; //linger 720x624 when VD HD is input,it not used.
//VPFE_CCDC_PIX_LINES=0x020d0271;;

/*
* sph = 1, nph = 1440, according to page 32-33 of the CCDC spec
* for BT.656 mode, this setting captures only the 720x480 of the
* active NTSV video window
*/
VPFE_CCDC_HORZ_INFO = width << 1; // Horizontal lines
VPFE_CCDC_HSIZE_OFF = width << 1; // Horizontal line offset
// VPFE_CCDC_HORZ_INFO = width<< 1; // Horizontal lines
// VPFE_CCDC_HSIZE_OFF = 0; // Horizontal line offset
VPFE_CCDC_VERT_START = 0; // Vertical start line
VPFE_CCDC_VERT_LINES = height >> 1; // Vertical lines
VPFE_CCDC_CULLING = 0xFFFF00FF; // Disable cullng

/*
* Interleave the two fields
*/
VPFE_CCDC_SDOFST = 0x00000249; 
VPFE_CCDC_SDR_ADDR = buffer;
VPFE_CCDC_CLAMP = 0;
VPFE_CCDC_DCSUB = 0;
VPFE_CCDC_COLPTN = 0xEE44EE44;
VPFE_CCDC_BLKCMP = 0;
VPFE_CCDC_FPC_ADDR = 0x86800000;
VPFE_CCDC_FPC = 0;
VPFE_CCDC_VDINT=0x01E00000;///?????????????????? *********change
////VPFE_CCDC_VDINT = 0;
VPFE_CCDC_ALAW = 0;
VPFE_CCDC_REC656IF = 0x00000003;
// VPFE_CCDC_REC656IF = 0x00000002; //linger

/*
* Input format is Cb:Y:Cr:Y, w/ Y in odd-pixel position
*/
//VPFE_CCDC_CCDCFG = 0x00000800;
VPFE_CCDC_CCDCFG = 0x00008800;
// VPFE_CCDC_FMTCFG = 0;
VPFE_CCDC_FMTCFG = 0x00008000; //linger
VPFE_CCDC_FMT_HORZ = 0x000002D0;
VPFE_CCDC_FMT_VERT = 0x00000240;//0x00000272;
VPFE_CCDC_FMT_ADDR0 = 0;
VPFE_CCDC_FMT_ADDR1 = 0;
VPFE_CCDC_FMT_ADDR2 = 0;
VPFE_CCDC_FMT_ADDR3 = 0;
VPFE_CCDC_FMT_ADDR4 = 0;
VPFE_CCDC_FMT_ADDR5 = 0;
VPFE_CCDC_FMT_ADDR6 = 0;
VPFE_CCDC_FMT_ADDR7 = 0;
VPFE_CCDC_PRGEVEN_0 = 0;
VPFE_CCDC_PRGEVEN_1 = 0;
VPFE_CCDC_PRGODD_0 = 0;
VPFE_CCDC_PRGODD_1 = 0;
VPFE_CCDC_VP_OUT = 0x04E22D00;
VPFE_CCDC_PCR = 0x00000001; // Enable CCDC
}

Lin Yong，

VD中断应该是每一帧/每一场都后触发一次的。

你说除了配置VDINT0为0以外，其他值都收不到中断。请问你其他值尝试了哪些？你输入的图像大小是多少?

VDINT=0x01E00000，里面的0x01E0就是VDINT0的值，中断源是14号中断，VDINT0的中断是事件24，图像大小是720*480，我475到480还有1、2什么的值都试过了。

非常感谢，问题已经解决了，设置成235就可以了。那这样的话是两次中断算一帧，还是一次中断一帧。

如果是两场的数据，每场就有一个vd中断，一帧是由两场组成的。

Wei Baogang,

如果是VD中断，PAL输入是50场，是20ms一次。

您好，我这边对中断的使用不是特别理解，在这里我想请教一下您，忘大神指教，具体例子就用前面讨论的（就是打开VDINT中断）

1、首先我拷入了一个vector.asm文件具体内容如下：

*
* Copyright (C) 2003 Texas Instruments Incorporated
* All Rights Reserved
*
*
*---------vecs_timer1.asm---------
*
* Assembly file to set up interrupt service table (IST)
*

*------------------------------------------------------------------------------
* Global symbols defined here and exported out of this file
*------------------------------------------------------------------------------
.global _vectors
.global _c_int00
.global _vector1
.global _vector2
.global _vector3
.global _vector4
.global _vector5
.global _vector6
.global _vector7
.global _vector8
.global _vector9
.global _vector10
.global _vector11
.global _vector12
.global _vector13
.global _extint7_isr ; Hookup the c_int14 ISR in main()
.global _vector15

*------------------------------------------------------------------------------
* Global symbols referenced in this file but defined somewhere else.
* Remember that your interrupt service routines need to be referenced here.
*------------------------------------------------------------------------------
.ref _c_int00
.ref _extint14_isr ; external interrupt INT 7 handler
*------------------------------------------------------------------------------
* This is a macro that instantiates one entry in the interrupt service table.
*------------------------------------------------------------------------------
VEC_ENTRY .macro addr
STW B0,*--B15
MVKL addr,B0
MVKH addr,B0
B B0
LDW *B15++,B0
NOP 2
NOP
NOP
.endm

*------------------------------------------------------------------------------
* This is a dummy interrupt service routine used to initialize the IST.
*------------------------------------------------------------------------------
_vec_dummy:
B B3
NOP 5

*------------------------------------------------------------------------------
* This is the actual interrupt service table (IST). It is properly aligned and
* is located in the subsection .text:vecs. This means if you don't explicitly
* specify this section in your linker command file, it will default and link
* into the .text section. Remember to set the ISTP register to point to this
* table.
*------------------------------------------------------------------------------
 .sect ".vectors"
;.align 1024

_vectors:
_vector0: VEC_ENTRY _c_int00 ;RESET
_vector1: VEC_ENTRY _vec_dummy ;NMI
_vector2: VEC_ENTRY _vec_dummy ;RSVD
_vector3: VEC_ENTRY _vec_dummy
_vector4: VEC_ENTRY _vec_dummy
_vector5: VEC_ENTRY _vec_dummy
_vector6: VEC_ENTRY _vec_dummy
_vector7: VEC_ENTRY _vec_dummy
_vector8: VEC_ENTRY _vec_dummy
_vector9: VEC_ENTRY _vec_dummy
_vector10: VEC_ENTRY _vec_dummy
_vector11: VEC_ENTRY _vec_dummy
_vector12: VEC_ENTRY _vec_dummy
_vector13: VEC_ENTRY _vec_dummy
_vector14: VEC_ENTRY _extint14_isr ; Hookup the c_int14 ISR in main()
_vector15: VEC_ENTRY _vec_dummy

*------------------------------------------------------------------------------

在这里这个文件我只是单纯的从网上当下来的，然后添加进工程中

2、开辟存储空间：

VECS:       o = 0x10800000  l = 0x00000400

  .vectors > VECS

在这里需要将 .vectors设置同asm文件中 .sect ".vectors"相同吧？

3、初始化中断并打开

CSR=0x100;/* disable all interrupts */
IER=1;/* disable all interrupts except NMI */
ICR=0xffff;/* clear all pending interrupts */
ISTP = 0x10800000;
INTC_EVTCLR0 = 0xFFFFFFFF;
INTC_EVTCLR1 = 0xFFFFFFFF;
INTC_EVTCLR2 = 0xFFFFFFFF;
INTC_EVTCLR3 = 0xFFFFFFFF;
//INTC_EVTFLAG1=0x00000000;
INTC_EVTMASK3 = 0xFFFFFFFF;
INTC_EVTMASK2 = 0xFFFFFFFF;
INTC_EVTMASK1 = 0xFFFFFFFF;
INTC_EVTMASK0 = 0xFEFFFFFF; //24
INTC_INTMUX3 = 0x00180000; //CPUINT7 //24 VPSS-CCDC0
IER |= 0x00004002; //使能中断14
CSR=0x01 ;//enable all interrupts

4、中断服务程序

interrupt void extint14_isr(void) //20ms进一次中断
{
INT_flag++;
if(INT_flag==2)
{
EVMDM6437_GPIO_setOutput(2,0);
ping_pong_buffer(BUF_flag); //160ms
EVMDM6437_GPIO_setOutput(2,1);
INT_flag=0;
if(BUF_flag==0) BUF_flag=1;
else if(BUF_flag==1) BUF_flag=0;
}