Data Capture Interface Library

This library provides routines for controlling the Data Capture Interface (DCAP) module. This is an 8-bit parallel interface that collects byte streaming data
from a sensor peripheral - e.g. a camera module in a 2Kbyte internal FIFO. The interface will provide a clock to the peripheral at a speed of 25MHz (max).

DCAP_Init

Prototype	void DCAP_Init();
Description	This function will initialize Data Capture Interface, enables camera module clock and configures corresponding pins.
Parameters	None.
Returns	Nothing.
Requires	Nothing.
Example	// Enable camera module clock and config corresponding pins DCAP_Init();
Notes	None.

DCAP_setCount

Prototype	void DCAP_setCount(uint32_t v);
Description	This function will set the number of bytes to capture after the last trigger event. This must be in multiple of 4 bytes.
Parameters	`v:` number of bytes to capture.
Returns	Nothing.
Requires	Nothing.
Example	// Set number of bytes to capture after the last trigger event DCAP_setCount(32);
Notes	None.

DCAP_setTrigpat

Prototype	void DCAP_setTrigpat(uint32_t v);
Description	This specifies the data capture trigger position. Data capture starts on the cycle when trigger transitions from 0 to 1.
Parameters	`v:` data capture trigger position.
Returns	Nothing.
Requires	Nothing.
Example	// Set data capture trigger position DCAP_setTrigpat(2);
Notes	None.

DCAP_setThreshold

Prototype	void DCAP_setThreshold(uint32_t v);
Description	This function specifies the threshold value for the HAS_DATA signal. It must be a multiple of 4 bytes.
Parameters	`v:` threshold value.
Returns	None.
Requires	Nothing.
Example	// Set the threshold value DCAP_setThreshold(64);
Notes	None.

DCAP_setClockPolarity

Prototype

void DCAP_setClockPolarity(uint32_t v);

Description

This function sets clock edge polarity on which the data will be captured.

Parameters

v: clock polarity. Valid values :

Value	Description
0	Falling edge.
1	Rising edge.

Returns

None.

Requires

Nothing.

Example

// Set the Falling edge polarity
DCAP_setClockPolarity(0);

Notes

None.

DCAP_hasData

Prototype	uint8_t DCAP_hasData();
Description	This function checks if there is at least threshold number of bytes (set by the DCAP_setThreshold routine) in FIFO buffer.
Parameters	None.
Returns	`0:` there is no threshold number of bytes in FIFO buffer. `1:` threshold number of bytes is in the FIFO buffer.
Requires	This routine requires threshold to be set by the DCAP_setThreshold routine.
Example	// Wait while FIFO is filled while(DCAP_hasData() == 0) ;
Notes	None.

DCAP_drain

Prototype	void DCAP_drain();
Description	This function empties FIFO buffer.
Parameters	None.
Returns	Nothing.
Requires	Nothing.
Example	// Empty FIFO buffer DCAP_drain();
Notes	None.

DCAP_ReadFIFO

Prototype	void DCAP_ReadFIFO(uint8_t * buffIn, unsigned long numOfButes);
Description	This function will read data brom the FIFO buffer and store it in the data buffer.
Parameters	`buffIn:` input buffer to store data from FIFO. `numOfButes:` number of bytes to be stored from FIFO
Returns	Nothing.
Requires	Nothing.
Example	uint8_t buffer[16]; DCAP_ReadFIFO(&buffer, numOfBytes); // Read data from FIFO
Notes	The data acquisition performance from the FIFO buffer will be increased if the input buffer is aligned to 4.

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