UDMA CAMERA Interface

Theory of Operation

Field	Bits	Type	Description
SADDR	31:0	RW	Address of receive memory buffer:
			Read: value of pointer until transfer is over, then 0
			Write: set memory buffer start address

Field	Bits	Type	Description
SIZE	15:0	RW	Buffer size in bytes (1MB max)
			Read: bytes remaining until transfer complete
			Write: set number of bytes to transfer

Field	Bits	Type	Default	Description
CLR	5:5	WO		Clear the receive channel
PENDING	5:5	RO		Receive transaction is pending
EN	4:4	RW		Enable the receive channel
DATASIZE	2:1	RW	0x02	Controls uDMA address increment
				0x00: increment address by 1 (data is 8 bits)
				0x01: increment address by 2 (data is 16 bits)
				0x02: increment address by 4 (data is 32 bits)
				0x03: increment address by 0
CONTINUOUS	0:0	RW		0x0: stop after last transfer for channel
				0x1: after last transfer for channel,
				reload buffer size and start address and restart channel

Field	Bits	Type	Description
EN	31:31	RW	Enable data RX from camera interface
			Enable/disable only happens at start of frame
			0x0: disable
			0x1: enable
SHIFT	14:11		Number of bits to right shift final pixel value
			Note: not used if FORMAT == BYPASS
FORMAT	10:8		Input frame format:
			0x0: RGB565
			0x1: RGB555
			0x2: RGB444
			0x4: BYPASS_LITTLEEND
			0x5: BYPASS_BIGEND
FRAMEWINDOW_EN	7:7		Windowing enable:
			0x0: disable
			0x1: enable
FRAMEDROP_VAL	6:1		How many frames dropped between receievd frame
FRAMEDROP_EN	0:0		Frame dropping enable:
			0x0: disable frame dropping
			0x1: enable frame dropping

Field	Bits	Type	Default	Description
FRAMEWINDOW_LLY	31:16			Y coordinate of lower left corner of window
FRAMEWINDOW_LLX	15:0			X coordinate of lower left corner of window

Field	Bits	Type	Default	Description
FRAMEWINDOW_URY	31:16			Y coordinate of upper right corner of window
FRAMEWINDOW_URX	15:0			X coordinate of upper right corner of window

Field	Bits	Type	Default	Description
ROWLEN	31:16			N-1 where N is the number of horizontal pixels
				(used in window mode)

Field	Bits	Description
R_COEFF	23:16	Coefficent that multiplies R component
		Note: not used if FORMAT == BYPASS
G_COEFF	15:8	Coefficent that multiplies G component
		Note: not used if FORMAT == BYPASS
B_COEFF	15:8	Coefficent that multiplies B component
		Note: not used if FORMAT == BYPASS