how the mdBindDev received the third parameter from the application layer
Hello, I'm studying the video port ddk driver, and my environment is
CCS5.5
DSP/BIOS5.42
ddk1.11
and I'm confused aboud how the mdBindDev received the third parameter from the application layer,
in the "video_rgb" example, I found there defined 3 variables in "evmdm642_vcapparamsNTSC.c", these are:
VPORTCAP_Params EVMDM642_vCapParamsChan = {
VPORT_MODE_BT656_8BIT, /* cmode:3 */
VPORT_FLDOP_FRAME, /* fldOp:3 */
VPORT_SCALING_DISABLE, /* scale:1 */
VPORT_RESMPL_DISABLE, /* resmpl:1 */
VPORTCAP_BPK_10BIT_ZERO_EXTENDED, /*bpk10Bit:2 */
VPORTCAP_HRST_END_HBLK, /*hCtRst:1 */
VPORTCAP_VRST_START_VBLK, /*vCtRst:1 */
VPORTCAP_FLDD_DISABLE, /*fldDect:1 */
VPORTCAP_EXC_ENABLE, /*extCtl:1 */
VPORTCAP_FINV_ENABLE, /* fldInv:1 */
0, /*fldXStrt1 */
18, /*fldYStrt1 */
0, /*fldXStrt2 */
18, /*fldYStrt2 */
LINE_SZ-1, /*fldXStop1 */
NUM_LINES + 18, /*fldYStop1 */
LINE_SZ-1, /*fldXStop2 */
NUM_LINES + 18, /*fldYStop2 */
(LINE_SZ>>3), /*thrld */
3, /*numFrmBufs*/
8, /*alignment */
VPORT_FLDS_MERGED, /*mergeFlds */
NULL, /*segId */
EDMA_OPT_PRI_HIGH, /*edmaPri */
8
};
VPORT_PortParams EVMDM642_vCapParamsPort = {
FALSE, /* enableDualChan; */
VPORT_POLARITY_ACTIVE_LOW, /* vport control pin 1 polarity */
VPORT_POLARITY_ACTIVE_HIGH, /* vport control pin 2 polarity */
VPORT_POLARITY_ACTIVE_HIGH, /* vport control pin 3 polarity */
&SAA7115_Fxns,
INV,
};
SAA7115_ConfParams EVMDM642_vCapParamsSAA7115 = {
SAA7115_MODE_NTSC720,
SAA7115_MODE_NTSC720,
SAA7115_AFMT_COMPOSITE,
FALSE,
FALSE,
INV
};
and I know that the first and third variable is passed to the mini driver by the follow code in the application layer:
capChan = FVID_create("/VP0CAPTURE/A/0",
IOM_INPUT, &status, (Ptr)&EVMDM642_vCapParamsChan, NULL);
FVID_control(capChan2, VPORT_CMD_EDC_BASE+EDC_CONFIG,
(Ptr)&EVMDM642_vCapParamsSAA7115);
but I can't find how the second variable passed to the mini-driver,but I find that it seemed the mdBindDev received
this variable,as is because the mdBinddev call flow is bellow:
static Int mdBindDev(Ptr *devp, Int devid, Ptr devParams)--->
mdControlChan(&portObjs[portNum], VPORT_CMD_CONFIG_PORT, devParams); --->
_configPort(chanp, args);
and we can find in the _configPort function bellow:
/*
* ======== _configPort ========
* configure port level registers
*/
static Int _configPort(Ptr chanp, Ptr args)
{
PortObj* port = (PortObj *)chanp;
volatile Int *base = (volatile Int *)port->base;
/* configure video port control register */
VPORT_PortParams* portParams = (VPORT_PortParams*)args;
/* enable video port */
base[_VP_PCR_OFFSET] |= VP_PCR_PEREN_ENABLE << _VP_PCR_PEREN_SHIFT;
/* reset video port */
base[_VP_VPCTL_OFFSET] |=
VP_VPCTL_VPRST_RESET << _VP_VPCTL_VPRST_SHIFT;
base[_VP_VPCTL_OFFSET] = VP_VPCTL_RMK(0,0,0,portParams->vc3Polarity,
portParams->vc2Polarity,portParams->vc1Polarity,0,0,
portParams->dualChanEnable);
/* enable video port */
base[_VP_VPCTL_OFFSET] |= (VP_VPCTL_VPHLT_CLEAR << _VP_VPCTL_VPHLT_SHIFT);
port->chanObj[0].edcFxns = portParams->edcTbl[0];
port->chanObj[1].edcFxns = portParams->edcTbl[1];
IRQ_clear(IRQ_EVT_EDMAINT);
return IOM_COMPLETED;
}
it received an arg and it's type is VPORT_PortParams, and it is same with the second variable "VPORT_PortParams EVMDM642_vCapParamsPort"defined in the file,
so I guess mdBindDev received this variable, but I' can't find how this variable passed to it, can anyone help me,thank you!
