xclk.h File Reference

XCLK generation via PWM. More...

#include <stdint.h>

Include dependency graph for xclk.h:

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Functions
int	xclk_start (int pin, uint32_t freq_hz)
	Start the camera master clock on a GPIO.
void	xclk_stop (int pin)

Detailed Description

XCLK generation via PWM.

Function Documentation

xclk_start()

int xclk_start	(	int	pin,
		uint32_t	freq_hz )

Start the camera master clock on a GPIO.

Uses the PWM slice of the given pin. Frequency is derived from the actual sys clock, so overclocked boards get the right frequency. The achievable granularity near 20 MHz is limited (sys_clk/N); OV sensors tolerate a wide range, so the closest divider is used.

Parameters

pin	GPIO number
freq_hz	requested frequency, typically 10-24 MHz

Returns

0 on success

xclk_stop()

void xclk_stop

(

int

pin

)

Stop the clock and release the pin.