www.pudn.com > SEED-DTK_VPM642v1.2.rar.rar > vportcap.c, change:2004-10-18,size:20009b
/********************************************************************/
/* Copyright 2004 by SEED Incorporated. */
/* All rights reserved. Property of SEED Incorporated. */
/* Restricted rights to use, duplicate or disclose this code are */
/* granted through contract. */
/* */
/********************************************************************/
/*以下的程序是用DMA方式采集图的的设置、中断、以及数据传输的函数*/
/**********************************************************/
/* Capture parameter definitions based on 525/60 format */
/**********************************************************/
/*NTSC*/
//#define VCA_HBLNK_SIZE 138 /* (858-720),horizontal blanking */
//#define VCA_IMG_VSIZE1 244 /* (263-20+1), fld1 vertical image size */
//#define VCA_IMG_VSIZE2 243 /* (525-283+1), fld2 vertical image size */
/*PAL*/
#define VCA_HBLNK_SIZE 144 /* (864-720),horizontal blanking */
/*确定第一场图像的重直像素为288*/
#define VCA_IMG_VSIZE1 288 /* (311-24+1), fld1 vertical image size */
/*确定第一场图像的重直像素为288*/
#define VCA_IMG_VSIZE2 288 /* (625-338+1), fld2 vertical image size */
/*确定第一场图像的水平像素为720*/
#define VCA_IMG_HSIZE1 720 /* field1 horizontal image size */
/*确定第二场图像的水平像素为720*/
#define VCA_IMG_HSIZE2 720 /* field2 horizontal image size */
/* 确定一场像素的大小为720×288 */
#define VCA_IMAGE_SIZE1 (VCA_IMG_HSIZE1 * VCA_IMG_VSIZE1)
/* 确定二场像素的大小为720×288 */
#define VCA_IMAGE_SIZE2 (VCA_IMG_HSIZE2 * VCA_IMG_VSIZE2)
/* Define threshold values in double.words. Both fields should have same threshold value*/
/* 确定FIFO的事件的门槛，为一行的长度，因为DM642为64位DMA，所以长度/8 */
#define VCA_VDTHRLD1 (VCA_IMG_HSIZE1/8) /* line length in */
#define VCA_VDTHRLD2 VCA_VDTHRLD1 /* double.words */
/* ....................................................... */
/* Define channel A capture window co-ordinates for Field1 */
/* ....................................................... */
/*设置图像的采集框*/
/* HRST = 0, start of horizontal blanking，HCOUNT在EAV后复位
即一行是从EAV之后开始 ，那行消隐在前，图像在后*/
#define VCA_XSTART1 (VCA_HBLNK_SIZE-2)/*EAV*/
#define VCA_XSTOP1 (VCA_XSTART1 + VCA_IMG_HSIZE1-1)
/* VRST = 1, end of vertical blanking */
#define VCA_YSTART1 1
#define VCA_YSTOP1 (VCA_YSTART1 + VCA_IMG_VSIZE1-1)
/* ....................................................... */
/* Define channel A capture window co-ordinates for Field2 */
/* ....................................................... */
/* HRST = 0, start of horizontal blanking */
#define VCA_XSTART2 (VCA_HBLNK_SIZE-2/*EAV*/)
#define VCA_XSTOP2 (VCA_XSTART2 + VCA_IMG_HSIZE2-1)
/* VRST = 1, end of vertical blanking */
#define VCA_YSTART2 1
#define VCA_YSTOP2 (VCA_YSTART2 + VCA_IMG_VSIZE2-1)
/* Define threshold values in double-words. Both fields should same threshold value */
/* 确定FIFO触发的长度*/
#define VCA_THRLD_FIELD1 (VCA_IMG_HSIZE1/8) /* line length in */
#define VCA_THRLD_FIELD2 VCA_THRLD_FIELD1 /* double-words */
/* Define number of events to be generated for field1 and field2
定义奇场（244）与偶场的行数（243）*/
#define VCA_CAPEVT1 (VCA_IMAGE_SIZE1 / (VCA_VDTHRLD1 * 8))
#define VCA_CAPEVT2 (VCA_IMAGE_SIZE2 / (VCA_VDTHRLD2 * 8))
/* in this example 定义采1帧 */
#define CAPCHA_FRAME_COUNT 1
/* ............................................ */
/* EDMA parameters for capture Y event that are */
/* specific to this example. */
/* ............................................ */
/* because VCA_THRLD_FIELDn is in double-words and element size is 32-bit */
#define VCA_Y_EDMA_ELECNT (VCA_THRLD_FIELD1 * 2)
#define VCA_Y_EDMA_FRMCNT ((VCA_CAPEVT1 + VCA_CAPEVT2) * CAPCHA_FRAME_COUNT)
/******************************************************************/
/* Description : 8.bit BT.656 non.continuous frame capture */
/* */
/* Some important field descriptions: */
/* */
/* CMODE = 000, 8.bit BT.656 mode */
/* CON = 0 */
/* FRAME = 1, capture frame */
/* CF2 = 0 */
/* CF1 = 0, (8-bit non.continuous frame capture) */
/* SCALE = 0, no scaling */
/* RESMPL= 0, no resampling */
/* 10BPK = X, not used in 8-bit capture */
/* EXC = 0, use EAV/SAV codes */
/* VRST = 1, end of vertical blanking */
/* HRST = 0, start of horizontal blanking */
/* FLDD = 0, 1st line EAV or FID input */
/* FINV = 0, no field invert */
/* RDFE = X, used in Raw mode only(Enable field identification) */
/* SSE = X, used in Raw mode only(Startup synch enable) */
/******************************************************************/
#include <vportcap.h>
/*................................................................ */
/* global variable declarations */
/* ............................................................... */
#pragma DATA_SECTION(capChaAYSpace, ".capChaAYSpace")
/* buffer to store captured Y-data */
Uint8 capChaAYSpace[720*588];
#pragma DATA_SECTION(capChaACbSpace, ".capChaACbSpace")
/* buffer to store captured Cb-data */
Uint8 capChaACbSpace[360*588];
#pragma DATA_SECTION(capChaACrSpace, ".capChaACrSpace")
/* buffer to store captured Cr-data */
Uint8 capChaACrSpace[360*588];
/* handle of vp that to be configured */
VP_Handle vpCaptureHandle;
/*设置Y、Cb、Cr的EDMA通路的句柄*/
EDMA_Handle hEdmaVPCapChaAY;
EDMA_Handle hEdmaVPCapChaACb;
EDMA_Handle hEdmaVPCapChaACr;
/* EDMA tcc for Y channel */
Int32 edmaCapChaAYTccNum = 0;
/* EDMA tcc for Cb channel */
Int32 edmaCapChaACbTccNum = 0;
/* EDMA tcc for Cb channel */
Int32 edmaCapChaACrTccNum = 0;
/* no of frames captured */
volatile Uint32 capChaAFrameCount = 0;
/* Error flags */
volatile Uint32 capChaAOverrun = 0;
volatile Uint32 capChaASyncError = 0;
volatile Uint32 capChaAShortFieldDetect = 0;
volatile Uint32 capChaALongFieldDetect = 0;
volatile Uint32 capNewFrame = 0;
/*******************************************************************/
/* Function : bt656_8bit_ncfc */
/* Input(s) : portNumber, video port number i.e. 0, 1 or 2. */
/* Description : Configures given video port for 8.bit BT.656 non. */
/* continuos frame capture on channel A. */
/*******************************************************************/
VP_Handle bt656_8bit_ncfc( int portNumber)
{
/* Open video port for capture ,打开一个视频端口*/
vpCaptureHandle = VP_open(portNumber, VP_OPEN_RESET);
if(vpCaptureHandle == INV)
{
return (VP_Handle)0xffff;
}
/* Enable video port functionality in VP Peripheral Control Reg(PCR)，使能视频端口*/
VP_FSETH(vpCaptureHandle, PCR, PEREN, VP_PCR_PEREN_ENABLE);
/* ..................... */
/* Enable all interrupts */
/* ..................... */
/*便能VCA的中断源*/
/* Enable capture overrun interrupt(COVRA) for VP channel A */
VP_FSETH(vpCaptureHandle, VPIE, COVRA, VP_VPIE_COVRA_ENABLE);
/* Enable capture complete interrupt(CCMPA) for VP channel A */
VP_FSETH(vpCaptureHandle, VPIE, CCMPA, VP_VPIE_CCMPA_ENABLE);
/* Enable channel synchronization error interrupt(SERRA) for */
/* VP channel A */
VP_FSETH(vpCaptureHandle, VPIE, SERRA, VP_VPIE_SERRA_ENABLE);
/* Enable short field detect interrupt(SFDA) for VP channel A */
VP_FSETH(vpCaptureHandle, VPIE, SFDA, VP_VPIE_SFDA_ENABLE);
/* Enable video port global interrupt enable */
VP_FSETH(vpCaptureHandle, VPIE, VIE, VP_VPIE_VIE_ENABLE);
/* ...................... */
/* Setup all other fields */
/* ...................... */
/* Enable short field detect，使能缺场探测*/
VP_FSETH(vpCaptureHandle, VCACTL, SFDE, VP_VCACTL_SFDE_ENABLE);
/* Set last pixel to be captured in Field1 (VCA_STOP1 reg) */
/*设置第一场的最后一个像素的Y轴与X轴的坐标*/
VP_RSETH(vpCaptureHandle, VCASTOP1,VP_VCASTOP1_RMK(VCA_YSTOP1, VCA_XSTOP1));
/* Set last pixel to be captured in Field2 (VCA_STOP2 reg) */
/*设置第二场的最后一个像素的Y轴与X轴的坐标*/
VP_RSETH(vpCaptureHandle, VCASTOP2,VP_VCASTOP2_RMK(VCA_YSTOP2, VCA_XSTOP2));
/* Set first pixel to be captured in Field1 (VCA_STRT1 reg) */
/*设置第一场的第一个像素的Y轴与X轴的坐标*/
VP_RSETH(vpCaptureHandle, VCASTRT1, VP_VCASTRT1_RMK(VCA_YSTART1,VP_VCASTRT1_SSE_ENABLE, VCA_XSTART1));
/* Set first pixel to be captured in Field2 (VCA_STRT2 reg) */
/*设置第二场的第一个像素的Y轴与X轴的坐标*/
VP_RSETH(vpCaptureHandle, VCASTRT2,VP_VCASTRT2_RMK(VCA_YSTART2, VCA_XSTART2));
/* Set threshold values ，设置EDMA启动的门限*/
VP_RSETH(vpCaptureHandle, VCATHRLD,VP_VCATHRLD_RMK(VCA_THRLD_FIELD2, VCA_THRLD_FIELD1));
/* Set capture event.register values，设置一场的需要的EDMA的次数 */
VP_RSETH(vpCaptureHandle, VCAEVTCT,VP_VCAEVTCT_RMK(VCA_CAPEVT2,VCA_CAPEVT1));
/* Vertical interrupts (VCA_INT) are not enabled in this example. */
/* Set CMODE to 8.bit BT.656，采用BT656格式的数据流 */
VP_FSETH(vpCaptureHandle, VCACTL, CMODE, VP_VCACTL_CMODE_BT656B);
/* Set non.continuous frame capture，设置为电视显示格式的采集，即不连续的采集，
CON/FRAME/CF2/CF1的值为0100 */
VP_FSETH(vpCaptureHandle, VCACTL, CON, VP_VCACTL_CON_DISABLE);
VP_FSETH(vpCaptureHandle, VCACTL, FRAME, VP_VCACTL_FRAME_FRMCAP);
VP_FSETH(vpCaptureHandle, VCACTL, CF2, VP_VCACTL_CF2_NONE);
VP_FSETH(vpCaptureHandle, VCACTL, CF1, VP_VCACTL_CF1_NONE);
/* Let FLDD and FINV to be their defaults */
/* Set VRST to end of vertical blanking,VCOUNT复位在场消隐之后 */
VP_FSETH(vpCaptureHandle, VCACTL, VRST, VP_VCACTL_VRST_V0EAV);
/* Set HRST to start of horizontal blanking，行计数复位在EAV之后 */
VP_FSETH(vpCaptureHandle, VCACTL, HRST, VP_VCACTL_HRST_OF(0));
/* 10.bit pack mode(10BPK bit) in this 8.bit example */
/* No (1/2) scaling and no chroma re.sampling in this example */
/*初始化EDMA通路*/
IRQ_enable(IRQ_EVT_VINT1);
/* Enable video port interrupts */
IRQ_enable(vpCaptureHandle->eventId);
/* Setup Y, Cb and Cr EDMA channels */
setupVPCapChaAEDMA(portNumber);
/* Clear VPHLT in VP_CTL to make video port function，清除VPHLT位?
使能其它位 */
VP_FSETH(vpCaptureHandle, VPCTL, VPHLT, VP_VPCTL_VPHLT_CLEAR);
/* .............. */
/* enable capture */
/* .............. */
/* set VCEN bit to enable capture，使能VCA口 */
VP_FSETH(vpCaptureHandle, VCACTL, VCEN, VP_VCACTL_VCEN_ENABLE);
/* clear BLKCAP in VCA_CTL to enable capture DMA events */
VP_FSETH(vpCaptureHandle, VCACTL, BLKCAP,VP_VCACTL_BLKCAP_CLEAR);
return (vpCaptureHandle);
}
/*******************************************************************/
/* Function : bt656_capture_start */
/* Input(s) : VP_handle */
/* Description : Configures given video port for 8.bit BT.656 non. */
/* continuos frame capture on channel A. */
/*******************************************************************/
void bt656_capture_start(VP_Handle videoHandle)
{
}
/*................................................................ */
/* Function : VPCapChaAIsr */
/* Description : This capture ISR clears FRMC to continue capture */
/* in this non.continuous mode and also clears other */
/* status bits. */
/*................................................................ */
interrupt void VPCapChaAIsr(void)
{
Uint32 vpis = 0;
/* Get video port status register value */
vpis = VP_RGETH(vpCaptureHandle, VPIS);
if(vpis & _VP_VPIS_CCMPA_MASK) /* capture complete */
{
/* Clear frame complete bit in VCX_CTL to continue capture in non-continuous mode*/
VP_FSETH(vpCaptureHandle, VCASTAT, FRMC,VP_VCASTAT_FRMC_CLEAR);
/* Clear CCMPA to enable next frame complete interrupts*/
VP_FSETH(vpCaptureHandle, VPIS, CCMPA,VP_VPIS_CCMPA_CLEAR);
capChaAFrameCount++; /* increment captured frame count */
capNewFrame = 1;
}
if(vpis & _VP_VPIS_COVRA_MASK) /* overrun error */
{
capChaAOverrun++;
VP_FSETH(vpCaptureHandle, VPIS, COVRA,VP_VPIS_COVRA_CLEAR);
}
if(vpis & _VP_VPIS_SERRA_MASK) /* synchronization error */
{
capChaASyncError++;
VP_FSETH(vpCaptureHandle, VPIS, SERRA,VP_VPIS_SERRA_CLEAR);
}
if(vpis & _VP_VPIS_SFDA_MASK) /* short field detect */
{
capChaAShortFieldDetect++;
VP_FSETH(vpCaptureHandle, VPIS, SFDA, VP_VPIS_SFDA_CLEAR);
}
if(vpis & _VP_VPIS_LFDA_MASK) /* long field detect */
{
capChaALongFieldDetect++;
VP_FSETH(vpCaptureHandle, VPIS, LFDA, VP_VPIS_LFDA_CLEAR);
}
}
/*................................................................ */
/* Function : setupVPCapChaAEDMA(Int32 portNumber) */
/* Input(s) : portNumber, video port number i.e. 0, 1 or 2. */
/* Description : Sets up EDMA channels for Y, U, V events for */
/* channel A capture. */
/*功能描述：将为Y，U，V建立EDMA的通路*/
/*................................................................ */
void setupVPCapChaAEDMA(int portNumber)
{
Int32 YEvent, UEvent, VEvent;
/* get channelA Y, U, V EDMA event numbers，选择触发事件 */
switch(portNumber)
{
/*确定相应的DMA通路*/
case VP_DEV0:
YEvent = EDMA_CHA_VP0EVTYA;
UEvent = EDMA_CHA_VP0EVTUA;
VEvent = EDMA_CHA_VP0EVTVA;
break;
case VP_DEV1:
YEvent = EDMA_CHA_VP1EVTYA;
UEvent = EDMA_CHA_VP1EVTUA;
VEvent = EDMA_CHA_VP1EVTVA;
break;
case VP_DEV2:
YEvent = EDMA_CHA_VP2EVTYA;
UEvent = EDMA_CHA_VP2EVTUA;
VEvent = EDMA_CHA_VP2EVTVA;
break;
}
/* Configure Y EDMA channel to move data from YSRCA */
/* (FIFO) to Y.data buffer, capChaAYSpace */
configVPCapEDMAChannel( &hEdmaVPCapChaAY, YEvent,
&edmaCapChaAYTccNum,
vpCaptureHandle->ysrcaAddr,
(Uint32)capChaAYSpace,
VCA_Y_EDMA_FRMCNT,
VCA_Y_EDMA_ELECNT);
/* Configure Cb EDMA channel to move data from CbSRCA */
/* (FIFO) to Cb.data buffer, capChaACbSpace */
configVPCapEDMAChannel( &hEdmaVPCapChaACb, UEvent,
&edmaCapChaACbTccNum,
vpCaptureHandle->cbsrcaAddr,
(Uint32)capChaACbSpace,
VCA_Y_EDMA_FRMCNT,
VCA_Y_EDMA_ELECNT/2); /* (1/2) of Y.samples */
/* Configure Cr EDMA channel to move data from CrSRCA */
/* (FIFO) to Cr.data buffer, capChaACrSpace */
configVPCapEDMAChannel( &hEdmaVPCapChaACr, VEvent,
&edmaCapChaACrTccNum,
vpCaptureHandle->crsrcaAddr,
(Uint32)capChaACrSpace,
VCA_Y_EDMA_FRMCNT,
VCA_Y_EDMA_ELECNT/2); /* (1/2) of Y.samples */
/* Enable three EDMA channels */
EDMA_enableChannel(hEdmaVPCapChaAY);
EDMA_enableChannel(hEdmaVPCapChaACb);
EDMA_enableChannel(hEdmaVPCapChaACr);
}
/*................................................................ */
/* Function : configVPCapEDMAChannel */
/* */
/* Input(s) : edmaHandle . pointer to EDMA handle. */
/* eventId . EDMA eventId. */
/* tccNum . pointer to transfer complete number. */
/* srcAddr . source address for EDMA transfer. */
/* dstAddr . destination address for EDMA transfer */
/* frameCount . frame count. */
/* elementCount . element count(32.bit element size). */
/* */
/* Output(s): edmaHandle . edma Handle of the given event. */
/* tccNum . transfer complete code for the given */
/* event. */
/* */
/* Description : Configures the given VP capture EDMA channel. */
/* The source address update is fixed address mode */
/* because the captured data is read from the FIFO. */
/* In this example, the destination address mode is */
/* auto.increment. But, in real.time applications */
/* there is lot of flexibility in the way capture */
/* buffers can be managed like ping.pong and round */
/* robin,…etc. */
/*................................................................ */
void configVPCapEDMAChannel(EDMA_Handle *edmaHandle,
Int32 eventId,
Int32 *tccNum,
Uint32 srcAddr,
Uint32 dstAddr,
Uint32 frameCount,
Uint32 elementCount)
{
Int32 tcc = 0;
EDMA_Handle hEdmaTable;
/* Open Y EVT EDMA channel */
*edmaHandle = EDMA_open(eventId, EDMA_OPEN_RESET);
if(*edmaHandle == EDMA_HINV)
{
for(;;){}
}
/* allocate TCC for Y event */
if((tcc = EDMA_intAlloc(-1)) == -1)
{
for(;;){}
}
/*打开一个新的EDMA链接*/
hEdmaTable = EDMA_allocTable(-1);
/* Configure EDMA parameters */
EDMA_configArgs(
*edmaHandle,
EDMA_OPT_RMK(EDMA_OPT_PRI_MEDIUM, /* medium priority 设置优先级为中*/
EDMA_OPT_ESIZE_32BIT, /* Element size 32 bits 元素的长度为4个Byte*/
EDMA_OPT_2DS_NO, /* 1.dimensional source(FIFO) 源采用固定的方试*/
EDMA_OPT_SUM_NONE, /* fixed src address mode(FIFO) 源地址不变*/
EDMA_OPT_2DD_YES, /* 2.dimensional destination 目的采用2维空间的组成*/
EDMA_OPT_DUM_INC, /* destination increment 目的采用增长的方式*/
EDMA_OPT_TCINT_YES, /* Enable transfer complete indication，使能传送结束指示*/
EDMA_OPT_TCC_OF(tcc & 0xF),/*设置完成标志CIP0的低位*/
EDMA_OPT_TCCM_OF(((tcc & 0x30) >> 4)),/*设置完成标志CIP0的高位*/
EDMA_OPT_ATCINT_NO, /* Disable Alternate Transfers 禁止交替传送 */
EDMA_OPT_ATCC_OF(0),/* Complete Interrupt 未使用交替完标志 */
EDMA_OPT_PDTS_DISABLE, /* disable PDT(peripheral device transfer) mode for source */
EDMA_OPT_PDTD_DISABLE, /* disable PDT mode for dest */
EDMA_OPT_LINK_YES, /* Disable linking */
EDMA_OPT_FS_NO), /* Array synchronization 阵列同步*/
EDMA_SRC_RMK(srcAddr),/*源地址*/
EDMA_CNT_RMK(EDMA_CNT_FRMCNT_OF((frameCount-1)),/*陈列的行数*/
EDMA_CNT_ELECNT_OF(elementCount)),/*每行的像素数*/
EDMA_DST_RMK(dstAddr),/*目的地址*/
EDMA_IDX_RMK(EDMA_IDX_FRMIDX_OF((elementCount * 4)),/*每行的增量*/
EDMA_IDX_ELEIDX_OF(0)), /* note: 32-bit element size */
/* no RLD in 2D and no linking */
EDMA_RLD_RMK(EDMA_RLD_ELERLD_OF(0), EDMA_RLD_LINK_OF(0))
);
EDMA_configArgs(
hEdmaTable,/*配置表的句柄*/
EDMA_OPT_RMK(EDMA_OPT_PRI_MEDIUM, /* medium priority 设置优先级为中*/
EDMA_OPT_ESIZE_32BIT, /* Element size 32 bits 元素的长度为4个Byte*/
EDMA_OPT_2DS_NO, /* 1.dimensional source(FIFO) 源采用固定的方试*/
EDMA_OPT_SUM_NONE, /* fixed src address mode(FIFO) 源地址不变*/
EDMA_OPT_2DD_YES, /* 2.dimensional destination 目的采用2维空间的组成*/
EDMA_OPT_DUM_INC, /* destination increment 目的采用增长的方式*/
EDMA_OPT_TCINT_YES, /* Enable transfer complete indication，使能传送结束指示*/
EDMA_OPT_TCC_OF(tcc & 0xF),/*设置完成标志CIP0的低位*/
EDMA_OPT_TCCM_OF(((tcc & 0x30) >> 4)),/*设置完成标志CIP0的高位*/
EDMA_OPT_ATCINT_NO, /* Disable Alternate Transfers 禁止交替传送 */
EDMA_OPT_ATCC_OF(0),/* Complete Interrupt 未使用交替完标志 */
EDMA_OPT_PDTS_DISABLE, /* disable PDT(peripheral device transfer) mode for source */
EDMA_OPT_PDTD_DISABLE, /* disable PDT mode for dest */
EDMA_OPT_LINK_YES, /* Disable linking */
EDMA_OPT_FS_NO), /* Array synchronization 阵列同步*/
EDMA_SRC_RMK(srcAddr),/*源地址*/
EDMA_CNT_RMK(EDMA_CNT_FRMCNT_OF((frameCount-1)),/*陈列的行数*/
EDMA_CNT_ELECNT_OF(elementCount)),/*每行的像素数*/
EDMA_DST_RMK(dstAddr),/*目的地址*/
EDMA_IDX_RMK(EDMA_IDX_FRMIDX_OF((elementCount * 4)),/*每行的增量*/
EDMA_IDX_ELEIDX_OF(0)), /* note: 32.bit element size */
/* no RLD in 2D and no linking */
EDMA_RLD_RMK(EDMA_RLD_ELERLD_OF(0), EDMA_RLD_LINK_OF(0))
);
/*连接两个DMA*/
EDMA_link(*edmaHandle,hEdmaTable);
/*使EDMA循环起来*/
EDMA_link(hEdmaTable,hEdmaTable);
*tccNum = tcc;/*返回中断完成标志*/
}